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        258 Permanent API jobs in London + 10 miles

        Principal Solution Architect

        TPXImpact Holdings Plc
        Shadwell, E1 1EW
        From £62,800 to £86,350 per annum
        About The Role - Job level:11 - Were growing our team! Were looking forPrincipal Solution Architectswho will serve as key leaders on client-facing projects. This role involves guiding clients and development teams through complex digital product development and technology implementations. You will work closely with clients and internal teams to understand context, co-design solutions, and lead technical teams through product development. In this role, you will be accountable for running projects, leading architecture work across some of our most complex and high-impact client programmes. You will design and oversee end-to-end technology solutions that are scalable, secure, user-centred, and ethically responsible. This role involves translating business needs into technology solutions, creating architecture artifacts, and supporting clients to make sustainable and user
        About The Role - Job level:11 - Were growing our team! Were looking forPrincipal Solution Architectswho will serve as key leaders on client-facing projects. This role involves guiding clients and development teams through complex digital product development and technology implementations. You will work closely with clients and internal teams to understand context, co-design solutions, and lead technical teams through product development. In this role, you will be accountable for running projects, leading architecture work across some of our most complex and high-impact client programmes. You will design and oversee end-to-end technology solutions that are scalable, secure, user-centred, and ethically responsible. This role involves translating business needs into technology solutions, creating architecture artifacts, and supporting clients to make sustainable and user
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        NEWPREMIUM

        Lead Android Engineer

        Halian Technology Limited
        London
        From £82,000 to £92,000 per annum
        Halian Technology are searching for an Lead Android Engineerto join our clients forward-thinking mobile team. Our client isone of the UKs most trusted and innovative omni-channel retailers, where technology and customer experience go hand in hand. If youre passionate about delivering high-quality mobile experiences and want to work with modern tools, great people, and at a company where learning and development are core valuesthis is the role for you. * Influence architecture and development strategy within a high-performing Agile squad. * Provide technical assurance and guidance across complex, high-impact projects. * Collaborate cross-functionally with iOS Engineers, BAs, QAs, Designers, and UX Specialists. * Champion Android best practices including Accessibility, CI/CD, TDD, and clean architecture.
        Halian Technology are searching for an Lead Android Engineerto join our clients forward-thinking mobile team. Our client isone of the UKs most trusted and innovative omni-channel retailers, where technology and customer experience go hand in hand. If youre passionate about delivering high-quality mobile experiences and want to work with modern tools, great people, and at a company where learning and development are core valuesthis is the role for you. * Influence architecture and development strategy within a high-performing Agile squad. * Provide technical assurance and guidance across complex, high-impact projects. * Collaborate cross-functionally with iOS Engineers, BAs, QAs, Designers, and UX Specialists. * Champion Android best practices including Accessibility, CI/CD, TDD, and clean architecture.
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        NEW

        Lead Solution Architect

        TPXImpact Holdings Plc
        Shadwell, E1 1EW
        From £52,800 to £72,600 per annum
        About The Role - Job level:10 - Were growing our team! Were looking forLead Solution Architectswho will play central roles in the successful delivery of technology projects. You will work closely with clients and internal teams to understand context, co-design solutions, and lead technical teams through product development. In this role, you will lead architecture work on client programmes. You will design and oversee end-to-end technology solutions that are scalable, secure, user-centred, and ethically responsible. This role involves translating business needs into technology solutions, creating architecture artefacts, and supporting clients to make sustainable and user-focused technology choices. You might be a specialist in a particular technology domain or platform - such as legacy system migration, m365, Azure, GCP, AWS, data platforms or intelligent process auto
        About The Role - Job level:10 - Were growing our team! Were looking forLead Solution Architectswho will play central roles in the successful delivery of technology projects. You will work closely with clients and internal teams to understand context, co-design solutions, and lead technical teams through product development. In this role, you will lead architecture work on client programmes. You will design and oversee end-to-end technology solutions that are scalable, secure, user-centred, and ethically responsible. This role involves translating business needs into technology solutions, creating architecture artefacts, and supporting clients to make sustainable and user-focused technology choices. You might be a specialist in a particular technology domain or platform - such as legacy system migration, m365, Azure, GCP, AWS, data platforms or intelligent process auto
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        NEWPREMIUM
        Champion best practices across testing disciplines including unit, integration, UI, API, and performance * Knowledge of web, mobile, API/microservices testing and contract testing (e.g. PACT)
        Champion best practices across testing disciplines including unit, integration, UI, API, and performance * Knowledge of web, mobile, API/microservices testing and contract testing (e.g. PACT)
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        PREMIUM

        Java Quantitative Developer Low Latency

        James Joseph Associates Limited
        EC2N, City of London
        From £150,000 to £175,000 per annum Circa 50-100% Bonus + Pension + Be
        Our client is a leading and well-established player in the Digital Asset and Cryptocurrency Quantitative/Algorithmic trading industry. The business is going from strength to strength, they are currently going through a period of exponential growth and are enjoying record profits The business is actively expanding as there is additional headcount for a number trade platform specialist Java Development with a focus on either/or Quantitative Development or low-latency performance optimization. You will be working on greenfield projects to build out and enhance their low latency trading systems. Working in a fast-paced trading environment as a Quant Developer, where you will collaborate closely with expert traders, quantitative analysts, and engineering specialists to craft and fine-tune trading strategies across both spot and derivative markets.
        Our client is a leading and well-established player in the Digital Asset and Cryptocurrency Quantitative/Algorithmic trading industry. The business is going from strength to strength, they are currently going through a period of exponential growth and are enjoying record profits The business is actively expanding as there is additional headcount for a number trade platform specialist Java Development with a focus on either/or Quantitative Development or low-latency performance optimization. You will be working on greenfield projects to build out and enhance their low latency trading systems. Working in a fast-paced trading environment as a Quant Developer, where you will collaborate closely with expert traders, quantitative analysts, and engineering specialists to craft and fine-tune trading strategies across both spot and derivative markets.
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        Full Stack Developer

        Rise Technical Recruitment Limited
        London
        £70000.00 - £85000.00 per annum + Progression + Training
        London (Office Based) £75,000 - £85,000 + Progression + Training - An excellent opportunity awaits a software engineer with strong Python and Java experience looking to advance their career at an ML-driven SaaS business. This role offers technical growth, variety, and strong development opportunities. The company is a profitable, growing business delivering AI-driven software solutions that optimise business processes in heavy industries. In this role, you'll join a driven and ambitious development team, working across the full stack with Java, Python and Vue.js. You'll manage infrastructure and deployment pipelines, use automation tools, and work with DevOps and cloud technologies (AWS). You will join an autonomous team that values enthusiasm, proactiveness, and training and development. This role is office based, five days per week in the office based in Central Lon
        London (Office Based) £75,000 - £85,000 + Progression + Training - An excellent opportunity awaits a software engineer with strong Python and Java experience looking to advance their career at an ML-driven SaaS business. This role offers technical growth, variety, and strong development opportunities. The company is a profitable, growing business delivering AI-driven software solutions that optimise business processes in heavy industries. In this role, you'll join a driven and ambitious development team, working across the full stack with Java, Python and Vue.js. You'll manage infrastructure and deployment pipelines, use automation tools, and work with DevOps and cloud technologies (AWS). You will join an autonomous team that values enthusiasm, proactiveness, and training and development. This role is office based, five days per week in the office based in Central Lon
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        PREMIUM

        Senior Full Stack Engineer

        REVYBE IT RECRUITMENT LIMITED
        EC1, City of London
        From £90,000 to £120,000 per annum + Shares
        London AI Start-up - Up to £120,000 + Shares + Private Healthcare + Pension - Were working with a well-funded AI start-up in London thats gearing up for huge growth. Theyre expecting to scale 10x over the next 18 months. Theyre now looking for a Senior Full-Stack Engineer to help design and build the next generation of their AI-driven platform. Reporting directly into the CTO and collaborating closely with product and research teams, this is a unique chance to take ownership across the stack and make a lasting impact in a company at the forefront of applied AI. The role - This isnt your standard engineering role youll be working end-to-end across frontend, backend, and cloud infrastructure. Youll build sleek, scalable applications with React and Next.js, design and maintain robust APIs with Node.js and Python, and architect solutions deployed on AWS or GCP.
        London AI Start-up - Up to £120,000 + Shares + Private Healthcare + Pension - Were working with a well-funded AI start-up in London thats gearing up for huge growth. Theyre expecting to scale 10x over the next 18 months. Theyre now looking for a Senior Full-Stack Engineer to help design and build the next generation of their AI-driven platform. Reporting directly into the CTO and collaborating closely with product and research teams, this is a unique chance to take ownership across the stack and make a lasting impact in a company at the forefront of applied AI. The role - This isnt your standard engineering role youll be working end-to-end across frontend, backend, and cloud infrastructure. Youll build sleek, scalable applications with React and Next.js, design and maintain robust APIs with Node.js and Python, and architect solutions deployed on AWS or GCP.
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        Junior Full Stack Python Developer - AI/LLMs - London (Hybrid, 1 day per week) - Up to £45k - Are you a Junior Full Stack Developer with a passion for Python, AI, and cutting-edge tech? This is your chance to join a brand-new, well-funded eCommerce start-up right at the beginning of its scale-up journey. Backed by recent investment and led by a proven entrepreneur with a track record of building successful businesses, this is a rare opportunity to play a pivotal role in shaping greenfield products that are the first of their kind. You'll work closely with the Founder and another experienced Developer, gaining hands-on experience with AI/LLMs, while building innovative products that will disrupt the market. * Strong foundation in Python * Experience with Node.js and React * Knowledge of cloud platforms (AWS or GCP) * Experience working with REST APIs
        Junior Full Stack Python Developer - AI/LLMs - London (Hybrid, 1 day per week) - Up to £45k - Are you a Junior Full Stack Developer with a passion for Python, AI, and cutting-edge tech? This is your chance to join a brand-new, well-funded eCommerce start-up right at the beginning of its scale-up journey. Backed by recent investment and led by a proven entrepreneur with a track record of building successful businesses, this is a rare opportunity to play a pivotal role in shaping greenfield products that are the first of their kind. You'll work closely with the Founder and another experienced Developer, gaining hands-on experience with AI/LLMs, while building innovative products that will disrupt the market. * Strong foundation in Python * Experience with Node.js and React * Knowledge of cloud platforms (AWS or GCP) * Experience working with REST APIs
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        NEW

        Salesforce Developer

        TPXImpact Holdings Plc
        Shadwell, E1 1EW
        From £55,000 to £60,000 per annum
        About The Role - We are looking for a skilled and versatile Salesforce Administrator and Developer to join our team. This hybrid role is crucial for both the day-to-day maintenance and long-term strategic enhancement of our Salesforce platform. The ideal candidate will be an expert in both declarative and programmatic solutions, ensuring our Salesforce instance is efficient, scalable, and tailored to our business needs. You will work within the Business Platform Team and be responsible for implementing our brand new Salesforce platform into the heart of our business. This will be a demanding role which will require prioritising the backlog of work against business goals. You will need to influence senior business domain experts with support from colleagues within the Business Platform Team. You will be responsible for day-to-day administration of the platform, as well
        About The Role - We are looking for a skilled and versatile Salesforce Administrator and Developer to join our team. This hybrid role is crucial for both the day-to-day maintenance and long-term strategic enhancement of our Salesforce platform. The ideal candidate will be an expert in both declarative and programmatic solutions, ensuring our Salesforce instance is efficient, scalable, and tailored to our business needs. You will work within the Business Platform Team and be responsible for implementing our brand new Salesforce platform into the heart of our business. This will be a demanding role which will require prioritising the backlog of work against business goals. You will need to influence senior business domain experts with support from colleagues within the Business Platform Team. You will be responsible for day-to-day administration of the platform, as well
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        NEWPREMIUM

        Salesforce Developer

        TPXImpact Holdings Plc
        Shadwell, E1 1EW
        From £55,000 to £60,000 per annum
        About The Role - We are looking for a skilled and versatile Salesforce Administrator and Developer to join our team. This hybrid role is crucial for both the day-to-day maintenance and long-term strategic enhancement of our Salesforce platform. The ideal candidate will be an expert in both declarative and programmatic solutions, ensuring our Salesforce instance is efficient, scalable, and tailored to our business needs. You will work within the Business Platform Team and be responsible for implementing our brand new Salesforce platform into the heart of our business. This will be a demanding role which will require prioritising the backlog of work against business goals. You will need to influence senior business domain experts with support from colleagues within the Business Platform Team. You will be responsible for day-to-day administration of the platform, as well
        About The Role - We are looking for a skilled and versatile Salesforce Administrator and Developer to join our team. This hybrid role is crucial for both the day-to-day maintenance and long-term strategic enhancement of our Salesforce platform. The ideal candidate will be an expert in both declarative and programmatic solutions, ensuring our Salesforce instance is efficient, scalable, and tailored to our business needs. You will work within the Business Platform Team and be responsible for implementing our brand new Salesforce platform into the heart of our business. This will be a demanding role which will require prioritising the backlog of work against business goals. You will need to influence senior business domain experts with support from colleagues within the Business Platform Team. You will be responsible for day-to-day administration of the platform, as well
        more
        NEWPREMIUM

        Bioprocess Engineer

        Hays
        The City, EC4
        £50000.0 - £70000.0 per annum + £50-70,000 DOE
        Your new company - You will be joining a pioneering organisation at the forefront of regenerative biotechnology. With a mission to transform waste into high-performance, sustainable materials, the company is driving innovation in bio-based manufacturing. You'll be part of a collaborative, interdisciplinary team working to scale cutting-edge biotechnologies that align natural and industrial systems. Your new role - As a Bioprocess Engineer, you will play a key role in designing, optimising, and scaling bioprocesses that convert waste streams into valuable materials. This includes upstream fermentation, downstream processing, and media optimisation. You will work closely with experts in engineering, chemistry, and material science to ensure seamless integration of biological processes into scalable, industrial solutions. This is a permanent role with a significant on-si
        Your new company - You will be joining a pioneering organisation at the forefront of regenerative biotechnology. With a mission to transform waste into high-performance, sustainable materials, the company is driving innovation in bio-based manufacturing. You'll be part of a collaborative, interdisciplinary team working to scale cutting-edge biotechnologies that align natural and industrial systems. Your new role - As a Bioprocess Engineer, you will play a key role in designing, optimising, and scaling bioprocesses that convert waste streams into valuable materials. This includes upstream fermentation, downstream processing, and media optimisation. You will work closely with experts in engineering, chemistry, and material science to ensure seamless integration of biological processes into scalable, industrial solutions. This is a permanent role with a significant on-si
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        NEW

        Lead Salesforce Developer

        Yolk Recruitment
        EC1, City of London
        £100000 - £110000 per annum + + excellent benefits
        Salesforce Team Lead - Remote - £110,000 - Yolk Recruitment are pleased to be working with a market leading global business who have been voted as one of the best places to work in 2024. They pride themselves on their forward-thinking culture and putting there employees first. We are currently searching for a Salesforce Team Lead who will be a key member of a growing team. You'll be responsible for leading, mentoring, and growing a cross-functional team of talented developers, quality assurance analysts, and test automation specialists. You will play a pivotal role in designing, developing, and implementing Salesforce solutions that meet business needs, ensuring optimal use of Salesforce features and functionalities. * Lead and manage a high-performing cross-functional development team, providing regular feedback and nurturing their technical and creative problem-solv
        Salesforce Team Lead - Remote - £110,000 - Yolk Recruitment are pleased to be working with a market leading global business who have been voted as one of the best places to work in 2024. They pride themselves on their forward-thinking culture and putting there employees first. We are currently searching for a Salesforce Team Lead who will be a key member of a growing team. You'll be responsible for leading, mentoring, and growing a cross-functional team of talented developers, quality assurance analysts, and test automation specialists. You will play a pivotal role in designing, developing, and implementing Salesforce solutions that meet business needs, ensuring optimal use of Salesforce features and functionalities. * Lead and manage a high-performing cross-functional development team, providing regular feedback and nurturing their technical and creative problem-solv
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        Client Roles - At Peregrine, were proud to be recruiting on behalf of our clients. We are recruiting an exciting opportunity for a Principal Design Architect, responsible for designing and assuring complex, high-impact solutions that align with enterprise architecture standards and strategic business objectives. A technology-led organisation working at the intersection of energy and digital infrastructure. They deliver secure, large-scale solutions that support national initiatives and enable innovation across the energy sector. The Principal Design Architect is a senior technical leader operating across multiple projects or domains, the role combines deep technical expertise with strong stakeholder engagement skills to shape architecture outcomes from concept to delivery. The Principal Solution Architect provides governance, coaching, and quality assurance for soluti
        Client Roles - At Peregrine, were proud to be recruiting on behalf of our clients. We are recruiting an exciting opportunity for a Principal Design Architect, responsible for designing and assuring complex, high-impact solutions that align with enterprise architecture standards and strategic business objectives. A technology-led organisation working at the intersection of energy and digital infrastructure. They deliver secure, large-scale solutions that support national initiatives and enable innovation across the energy sector. The Principal Design Architect is a senior technical leader operating across multiple projects or domains, the role combines deep technical expertise with strong stakeholder engagement skills to shape architecture outcomes from concept to delivery. The Principal Solution Architect provides governance, coaching, and quality assurance for soluti
        more
        NEW
        Client Roles - At Peregrine, were proud to be recruiting on behalf of our clients. We are recruiting an exciting opportunity for a Principal Design Architect, responsible for designing and assuring complex, high-impact solutions that align with enterprise architecture standards and strategic business objectives. A technology-led organisation working at the intersection of energy and digital infrastructure. They deliver secure, large-scale solutions that support national initiatives and enable innovation across the energy sector. The Principal Design Architect is a senior technical leader operating across multiple projects or domains, the role combines deep technical expertise with strong stakeholder engagement skills to shape architecture outcomes from concept to delivery. The Principal Solution Architect provides governance, coaching, and quality assurance for soluti
        Client Roles - At Peregrine, were proud to be recruiting on behalf of our clients. We are recruiting an exciting opportunity for a Principal Design Architect, responsible for designing and assuring complex, high-impact solutions that align with enterprise architecture standards and strategic business objectives. A technology-led organisation working at the intersection of energy and digital infrastructure. They deliver secure, large-scale solutions that support national initiatives and enable innovation across the energy sector. The Principal Design Architect is a senior technical leader operating across multiple projects or domains, the role combines deep technical expertise with strong stakeholder engagement skills to shape architecture outcomes from concept to delivery. The Principal Solution Architect provides governance, coaching, and quality assurance for soluti
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        NEWPREMIUM
        Build and work with modern API and microservices architectures
        Build and work with modern API and microservices architectures
        NEW

        Test Analyst

        Hays
        E1, East London
        £35000.0 - £45000.0 per annum + Competitive + benefits package
        Hays Software Engineering are looking for a Test Analyst to join a renowned London based Insurer with huge growth plans. What you will be doing:You will be part of a lean family type IT team responsible for all things tech operations and directly responsible for implementing a testing environment for electronic trading platforms. As well as the above, you will be responsible for liaising with internal stakeholders such as Actuarial, Underwriting and Finance professionals to ensure the smooth implementation of system updates. This specific client operates their IT team with 0 ego's. Therefore, there may be an element of mentoring newer members of the team and assisting where the business requires. What you'll receive in return:The opportunity to work for a people centric business that will allow you to own full trading platform implementations, from design to deploy, .
        Hays Software Engineering are looking for a Test Analyst to join a renowned London based Insurer with huge growth plans. What you will be doing:You will be part of a lean family type IT team responsible for all things tech operations and directly responsible for implementing a testing environment for electronic trading platforms. As well as the above, you will be responsible for liaising with internal stakeholders such as Actuarial, Underwriting and Finance professionals to ensure the smooth implementation of system updates. This specific client operates their IT team with 0 ego's. Therefore, there may be an element of mentoring newer members of the team and assisting where the business requires. What you'll receive in return:The opportunity to work for a people centric business that will allow you to own full trading platform implementations, from design to deploy, .
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        NEW
        Lead Software Engineer - London (Hybrid 1x Per Month) Salary: Up to £100k + Benefits + Stock Options - About Us - Our client is a Insurtech Unicorn looking to expand their engineering team. With the opportunity to work on existing products which have generated millions in revenue to something new changing the landscape of the insurance world, this is the perfect opportunity for a results driven and growth focussed Senior engineer looking to start an ambitious business. The Role - We're seeking a Lead Fullstack Engineer to own the frontend architecture and elevate the B2C user experience across our digital products. This is a high-impact role requiring technical vision, hands-on expertise, and leadership to drive innovation in a rapidly evolving environment. As part of a cross-functional, agile team, you will shape the frontend roadmap, champion best practices, and fos
        Lead Software Engineer - London (Hybrid 1x Per Month) Salary: Up to £100k + Benefits + Stock Options - About Us - Our client is a Insurtech Unicorn looking to expand their engineering team. With the opportunity to work on existing products which have generated millions in revenue to something new changing the landscape of the insurance world, this is the perfect opportunity for a results driven and growth focussed Senior engineer looking to start an ambitious business. The Role - We're seeking a Lead Fullstack Engineer to own the frontend architecture and elevate the B2C user experience across our digital products. This is a high-impact role requiring technical vision, hands-on expertise, and leadership to drive innovation in a rapidly evolving environment. As part of a cross-functional, agile team, you will shape the frontend roadmap, champion best practices, and fos
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        NEW

        Senior Full Stack Developer PHP

        ByteHire
        NW6, North West London
        From £70,000 to £85,000 per annum
        Job Role: Senior Full-Stack PHP Developer - Working Hours: 5 days per week - Job Type: Permanent - Salary: £70,000 - £85,000 depending on experience - Location: London - Remote: 4 days remote - 1 day on-site in London office - Postcode NW6 - About the Company - Our client is a rapidly growing platform that connects individuals with industry professionals for special events. By offering unique opportunities, the platform allows professionals in the field to achieve higher earnings while enjoying enhanced flexibility and a better work-life balance. Role Overview - This is an exciting opportunity to join a high-growth, early-stage startup. As a Full-Stack Developer, youll work closely with the founders and engineers in a tight-knit, London-based team. Youll have a direct impact on the companys expansion into new international markets, shaping the future of the business.
        Job Role: Senior Full-Stack PHP Developer - Working Hours: 5 days per week - Job Type: Permanent - Salary: £70,000 - £85,000 depending on experience - Location: London - Remote: 4 days remote - 1 day on-site in London office - Postcode NW6 - About the Company - Our client is a rapidly growing platform that connects individuals with industry professionals for special events. By offering unique opportunities, the platform allows professionals in the field to achieve higher earnings while enjoying enhanced flexibility and a better work-life balance. Role Overview - This is an exciting opportunity to join a high-growth, early-stage startup. As a Full-Stack Developer, youll work closely with the founders and engineers in a tight-knit, London-based team. Youll have a direct impact on the companys expansion into new international markets, shaping the future of the business.
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        NEW

        Related Jobs


        show more

        What is the average salary for API in London?

        Average salary per year
        £72,499

        The average salary for a API in London is £72,499. API in London salaries range from £62,499 to £87,499.

        Frequently Asked Questions

        How many permanent API jobs are there in London?
        There are 258 permanent API jobs within 10 miles of London available on Totaljobs right now.

        Where in London are these permanent jobs?
        You can find permanent jobs in City of London, Central London, West End.

        What other similar jobs are there to permanent API jobs in London?
        As well as permanent API jobs in London, you can find permanent Salesforce, Data Analytics, Services, amongst many others.