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- Shoreditch
- The City, City (EC2)
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61 Permanent API jobs in City of London + 20 miles
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C# Developer .Net SQL API
C# Developer .Net SQL API
Client Server
The City, City of London (EC4), EC4R
£75000 - £90000 per annum + benefits
C# Developer / Software Engineer (C# .Net SQL API) London onsite to £90k - There's a focus on backend and API development although you'll also have elements of front end work with JavaScript and React.js. Apply now to find out more about this C# Developer / Software Engineer (C# .Net SQL API) opportunity.
C# Developer / Software Engineer (C# .Net SQL API) London onsite to £90k - There's a focus on backend and API development although you'll also have elements of front end work with JavaScript and React.js. Apply now to find out more about this C# Developer / Software Engineer (C# .Net SQL API) opportunity.
PREMIUM
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Workplace Platform Engineer (DocuSign & 365 & API)
Workplace Platform Engineer (DocuSign & 365 & API)
Morson Edge
City of London, London, EC1A 1AA
Market related
We are seeking a Platform Engineer to join the Modern Workplace team at a leading banking client. This team is focused on delivering a flexible, efficient, and seamless digital workplace experience, enabling colleagues to collaborate and perform effectively using enterprise tools such as Microsoft 365 and DocuSign. The successful candidate will be a key contributor to the Productivity Applications portfolio, responsible for configuring, maintaining, and enhancing platforms that support a high-performing digital workplace. Key Responsibilities * Configure, develop, and maintain solutions across the Productivity Applications platform * Contribute to the design and implementation of new digital workplace capabilities * Manage the end-to-end lifecycle of platform solutions, ensuring continuous improvement * Support business-as-usual changes and incremental enhancements
We are seeking a Platform Engineer to join the Modern Workplace team at a leading banking client. This team is focused on delivering a flexible, efficient, and seamless digital workplace experience, enabling colleagues to collaborate and perform effectively using enterprise tools such as Microsoft 365 and DocuSign. The successful candidate will be a key contributor to the Productivity Applications portfolio, responsible for configuring, maintaining, and enhancing platforms that support a high-performing digital workplace. Key Responsibilities * Configure, develop, and maintain solutions across the Productivity Applications platform * Contribute to the design and implementation of new digital workplace capabilities * Manage the end-to-end lifecycle of platform solutions, ensuring continuous improvement * Support business-as-usual changes and incremental enhancements
PREMIUM
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Senior Solutions Architect
Senior Solutions Architect
The Talent Ladder
St James, South West London (SW1), SW1A
Up to £125,000 per annum Bonus and travel allowance
API design & microservices architecture
API design & microservices architecture
NEWPREMIUM
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Contract .Net Developer – Insurance claims system
Contract .Net Developer – Insurance claims system
Hireful
Central London, London
£400 per day outside IR35
We’re looking for a proactive, self-sufficient developer with strong experience in .NET, API development, microservices architecture, and database integration.
We’re looking for a proactive, self-sufficient developer with strong experience in .NET, API development, microservices architecture, and database integration.
FEATURED
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Lead Solution Architect – Endur (ETRM Gas & Power Trading)
Lead Solution Architect – Endur (ETRM Gas & Power Trading)
BP Energy
St James, South West London (SW1), WC2N 5DU
Competitive
Experience with modern architecture patterns: microservices, messaging/event-driven design, caching, and API strategy.
Experience with modern architecture patterns: microservices, messaging/event-driven design, caching, and API strategy.
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Solutions Architect
Solutions Architect
MARSH CORPORATE SERVICES LIMITED
City of London (EC1)
Pension, Healthcare, Life Insurance and much more
Deep fluency in London Market placing platforms and integration patterns (Whitespace, PPL, API ecosystem).
Deep fluency in London Market placing platforms and integration patterns (Whitespace, PPL, API ecosystem).
PREMIUM
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Solutions Architect
Solutions Architect
Solus Accident Repair Centres
North London, London
GBP £50,000.00/Yr. - GBP £65,000.00/Yr.
Deep knowledge of modern enterprise patterns, SaaS adoption, API and event based integrations and resilience approaches.
Deep knowledge of modern enterprise patterns, SaaS adoption, API and event based integrations and resilience approaches.
Full Stack Engineer - Equity
Full Stack Engineer - Equity
Dental startup
Central London (W1)
Up to £60,000 per annum Equity - Founding Engineer
You'll own the full stack database architecture, API layer, and front-end, and you'll work directly with the founder on every major decision. * Architect and build the core platform from scratch schema, API, and front-end * Strong Node.js REST API development, authentication, middleware * Third-party API and webhook integration experience
You'll own the full stack database architecture, API layer, and front-end, and you'll work directly with the founder on every major decision. * Architect and build the core platform from scratch schema, API, and front-end * Strong Node.js REST API development, authentication, middleware * Third-party API and webhook integration experience
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AboutTheRole - WerelookingformultipleLeadTechnicalArchitectswhowillplayacentralroleinthesuccessfuldeliveryoftechnologyprojects. Youwillworkcloselywithclientsandinternalteamstounderstandcontext,co-designsolutions,andleadtechnicalteamsthroughproductdevelopment. Inthisrole,youwillleadarchitectureworkonclientprogrammes. Youwilldesignandoverseeend-to-endtechnologysolutionsthatarescalable,secure,user-centred,andethicallyresponsible. Thisroleinvolvestranslatingbusinessneedsintotechnologysolutions,creatingarchitectureartefacts,andsupportingclientstomakesustainableanduser-focusedtechnologychoices. Youmightbeaspecialistinaparticulartechnologydomainorplatform-suchaslegacysystemmigration,m365,Azure,GCP,AWS,dataplatformsorintelligentprocessautomation-butyouwillapplyatechnologyagnosticperspective. You'lloperateasatrustedadvisor,oftenleadingsmallerengagementsorplayingaseniorroleonlargerones,butmayalsoworksoloorcontributeasamemberofateamasneeded.
AboutTheRole - WerelookingformultipleLeadTechnicalArchitectswhowillplayacentralroleinthesuccessfuldeliveryoftechnologyprojects. Youwillworkcloselywithclientsandinternalteamstounderstandcontext,co-designsolutions,andleadtechnicalteamsthroughproductdevelopment. Inthisrole,youwillleadarchitectureworkonclientprogrammes. Youwilldesignandoverseeend-to-endtechnologysolutionsthatarescalable,secure,user-centred,andethicallyresponsible. Thisroleinvolvestranslatingbusinessneedsintotechnologysolutions,creatingarchitectureartefacts,andsupportingclientstomakesustainableanduser-focusedtechnologychoices. Youmightbeaspecialistinaparticulartechnologydomainorplatform-suchaslegacysystemmigration,m365,Azure,GCP,AWS,dataplatformsorintelligentprocessautomation-butyouwillapplyatechnologyagnosticperspective. You'lloperateasatrustedadvisor,oftenleadingsmallerengagementsorplayingaseniorroleonlargerones,butmayalsoworksoloorcontributeasamemberofateamasneeded.
PREMIUM
T24 Developer - Transact
T24 Developer - Transact
Hireful
Central London, London
66K Basic + 12.5% Pension + Bonus (typical 25%, performance based) + 2
Experience participating in T24 upgrade and integration projects (including API integrations).
Experience participating in T24 upgrade and integration projects (including API integrations).
FEATURED
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Implement robust state management and API integration * Collaborate with backend teams on API contracts and integration
Implement robust state management and API integration * Collaborate with backend teams on API contracts and integration
FEATURED
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Work with .NET (C#), Azure Integration Services (Logic Apps, API Management, Service Bus, Event Grid), and containerised microservices (Docker, AKS). * Champion best practices for API-led connectivity, event-driven architectures, and pub/sub messaging patterns. * Understanding of integration patterns (pub/sub, API-led, event-driven) and security standards (OAuth2, JWT, TLS, API security).
Work with .NET (C#), Azure Integration Services (Logic Apps, API Management, Service Bus, Event Grid), and containerised microservices (Docker, AKS). * Champion best practices for API-led connectivity, event-driven architectures, and pub/sub messaging patterns. * Understanding of integration patterns (pub/sub, API-led, event-driven) and security standards (OAuth2, JWT, TLS, API security).
NEW
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API integration
API integration
PREMIUM
Working knowledge of SQL, JSON, or API troubleshooting
Working knowledge of SQL, JSON, or API troubleshooting
FEATURED
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Experience withAzure (APIM, Azure Functions, API Services), React/React-Native and.NET Core - Proficiency in at least one major API testing framework - Experience with API testing (REST, Postman)
Experience withAzure (APIM, Azure Functions, API Services), React/React-Native and.NET Core - Proficiency in at least one major API testing framework - Experience with API testing (REST, Postman)
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Experience with Azure API Management or similar API gateways.
Experience with Azure API Management or similar API gateways.
PREMIUM
Are you a technical visionary ready to shape the future of global commerce? We are partnering with a world-leading family of iconic activewear and footwear brands to find a Digital Commerce Architect. This is a pivotal role owning the architectural evolution of a Shopify-led ecosystem across B2B and D2C. You will act as the technical authority, managing a diverse digital backlog and governing a multi-vendor environment to deliver scalable, secure, and future-ready solutions. The Requirements * Proven experience as a Digital or Commerce Architect in B2B/D2C. * Deep expertise in Shopify architecture and the supporting app estate. * Strong understanding of MACH, headless, and composable commerce. * Expertise in managing third-party integrators and APIs (SAP, PIM, CRM). * Leadership skills to mentor engineers and influence senior stakeholders. The Benefits
Are you a technical visionary ready to shape the future of global commerce? We are partnering with a world-leading family of iconic activewear and footwear brands to find a Digital Commerce Architect. This is a pivotal role owning the architectural evolution of a Shopify-led ecosystem across B2B and D2C. You will act as the technical authority, managing a diverse digital backlog and governing a multi-vendor environment to deliver scalable, secure, and future-ready solutions. The Requirements * Proven experience as a Digital or Commerce Architect in B2B/D2C. * Deep expertise in Shopify architecture and the supporting app estate. * Strong understanding of MACH, headless, and composable commerce. * Expertise in managing third-party integrators and APIs (SAP, PIM, CRM). * Leadership skills to mentor engineers and influence senior stakeholders. The Benefits
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Principal Test Engineer
Principal Test Engineer
Vitality Corporate Services Limited - Tech
Charing Cross, Central London (WC2), WC2R
£Competitive + Bonus + Benefits
Strong hands-on experience in API test automation, including scenario design, data setup, and validation.
Strong hands-on experience in API test automation, including scenario design, data setup, and validation.
PREMIUM
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Job description - We are currently recruiting for anAI Security Senior Architectto join our London office. The Information Security team is a strategic enabler for our global law firm, focused on protecting client data, intellectual property, and business operations while enabling secure innovation. Through four key pillars Digital Trust, Technical Assurance, Security Operations, and Governance, Risk and Compliance (GRC) the team delivers comprehensive security solutions that align with our firms strategic objectives as well as client and regulatory requirements. Our integrated approach combines secure by design principles relying on Identity and Access Management, Technical Assurance, continuous monitoring and incident response through Security Operations, and proactive risk management through GRC.
Job description - We are currently recruiting for anAI Security Senior Architectto join our London office. The Information Security team is a strategic enabler for our global law firm, focused on protecting client data, intellectual property, and business operations while enabling secure innovation. Through four key pillars Digital Trust, Technical Assurance, Security Operations, and Governance, Risk and Compliance (GRC) the team delivers comprehensive security solutions that align with our firms strategic objectives as well as client and regulatory requirements. Our integrated approach combines secure by design principles relying on Identity and Access Management, Technical Assurance, continuous monitoring and incident response through Security Operations, and proactive risk management through GRC.
NEW
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Senior Enterprise Architect - ServiceNow - Remote US available
Senior Enterprise Architect - ServiceNow - Remote US available
TJX UK
Watford (WD17), WD17 1TX
Competitive + Benefits
TJX Companies - At TJX Companies, every day brings new opportunities for growth, exploration, and achievement. You'll be part of our vibrant team that embraces diversity, fosters collaboration, and prioritizes your development. Whether you're working in our four global Home Offices, Distribution Centers or Retail Stores-TJ Maxx, Marshalls, Homegoods, Homesense, Sierra, Winners, and TK Maxx, you'll find abundant opportunities to learn, thrive, and make an impact. Come join our TJX family-a Fortune 100 company and the world's leading off-price retailer. Wh o we are - The Enterprise Architecture team at TJX drives technology strategy , innovation, and governance across multiple technical domains to ensure all technology decisions align with business goals and enterprise standards. We are seeking a Senior Enterprise Architect with d eep ServiceNow experience to lead the design, ...
TJX Companies - At TJX Companies, every day brings new opportunities for growth, exploration, and achievement. You'll be part of our vibrant team that embraces diversity, fosters collaboration, and prioritizes your development. Whether you're working in our four global Home Offices, Distribution Centers or Retail Stores-TJ Maxx, Marshalls, Homegoods, Homesense, Sierra, Winners, and TK Maxx, you'll find abundant opportunities to learn, thrive, and make an impact. Come join our TJX family-a Fortune 100 company and the world's leading off-price retailer. Wh o we are - The Enterprise Architecture team at TJX drives technology strategy , innovation, and governance across multiple technical domains to ensure all technology decisions align with business goals and enterprise standards. We are seeking a Senior Enterprise Architect with d eep ServiceNow experience to lead the design, ...
Senior Principal Manager for Portfolio, Analytics & Insights (PAI)
Senior Principal Manager for Portfolio, Analytics & Insights (PAI)
BP Energy
Sunbury-On-Thames (TW16)
Competitive
Agility core practices, Agility core practices, API and platform design, Benefits Management, Business Analysis, Business modelling, Client Counseling, Cloud Platforms, Configuration management and release, Data Analysis, Data design, Data Management, Demand Management, Design Thinking, Dialogue enablement, Digital Innovation, Digital Product Management, Employee Experience, Empowering Others, Facilitation, Influencing, Long Term Planning, Managing change, Marketing strategy, Measurement and metrics {+ 5 more}
Agility core practices, Agility core practices, API and platform design, Benefits Management, Business Analysis, Business modelling, Client Counseling, Cloud Platforms, Configuration management and release, Data Analysis, Data design, Data Management, Demand Management, Design Thinking, Dialogue enablement, Digital Innovation, Digital Product Management, Employee Experience, Empowering Others, Facilitation, Influencing, Long Term Planning, Managing change, Marketing strategy, Measurement and metrics {+ 5 more}
)
Director of Technical Delivery
Director of Technical Delivery
Wilmington
City of London (EC4R)
Circa £100,000 - £110,000 (DoE) + 15% bonus
Strong expertise in composable, microservice-based architectures, including API design, event-driven integration, and service decomposition - Proven track record delivering large-scale platform integration or migration programmes across complex, multi-system and multi-vendor environments, including API integration, data migration, identity consolidation, release management, and cutover execution
Strong expertise in composable, microservice-based architectures, including API design, event-driven integration, and service decomposition - Proven track record delivering large-scale platform integration or migration programmes across complex, multi-system and multi-vendor environments, including API integration, data migration, identity consolidation, release management, and cutover execution
FEATURED
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Senior AWS DevOps Engineer (Test & Infrastructure Resilience) Location: Remote Working - Security Clearance: Must be eligible for SC Clearance - 6 Months Contract £400 to £600 a day inside IR35 - A top-tier consultancy firm is looking for an experienced AWS DevOps Engineer with a strong background in testing to help maintain and evolve Critical National Infrastructure (CNI) for a top UK client. This is a pivotal role in maintaining critical national infrastructure where scalability and resilience are essential. We're looking for a highly skilled DevOps engineer with a strong background in testing (including APIs). The ideal candidate should be self-motivated and results-driven, capable of thriving in an Agile team. You'll need to be comfortable with Confluence for documentation and Jira for project tracking and story management.
Senior AWS DevOps Engineer (Test & Infrastructure Resilience) Location: Remote Working - Security Clearance: Must be eligible for SC Clearance - 6 Months Contract £400 to £600 a day inside IR35 - A top-tier consultancy firm is looking for an experienced AWS DevOps Engineer with a strong background in testing to help maintain and evolve Critical National Infrastructure (CNI) for a top UK client. This is a pivotal role in maintaining critical national infrastructure where scalability and resilience are essential. We're looking for a highly skilled DevOps engineer with a strong background in testing (including APIs). The ideal candidate should be self-motivated and results-driven, capable of thriving in an Agile team. You'll need to be comfortable with Confluence for documentation and Jira for project tracking and story management.
FEATURED
Senior Java Software Engineer - Build the Future of Banking
Senior Java Software Engineer - Build the Future of Banking
Morson Edge
City of London, London, EC1A 1AA
£90k - 110k per year + Excellent
We’re looking for a Senior Java Software Engineer to play a pivotal role in transforming the technology landscape of a leading bank. This is a permanent position offering a highly competitive salary, long-term stability, and outstanding career progression for engineers who thrive in fast-paced, regulated environments such as financial services, government, or the public sector. The Opportunity - This is more than just a role — it’s a long-term career opportunity where you’ll help drive real, meaningful change across critical banking platforms. You’ll be at the centre of a multi-year transformation journey, modernising systems that underpin operations, compliance, transactions, and client management. Your work won’t sit on the sidelines — it will directly influence how the bank evolves, scales, and delivers for its customers.
We’re looking for a Senior Java Software Engineer to play a pivotal role in transforming the technology landscape of a leading bank. This is a permanent position offering a highly competitive salary, long-term stability, and outstanding career progression for engineers who thrive in fast-paced, regulated environments such as financial services, government, or the public sector. The Opportunity - This is more than just a role — it’s a long-term career opportunity where you’ll help drive real, meaningful change across critical banking platforms. You’ll be at the centre of a multi-year transformation journey, modernising systems that underpin operations, compliance, transactions, and client management. Your work won’t sit on the sidelines — it will directly influence how the bank evolves, scales, and delivers for its customers.
PREMIUM
GenAI Engineer Python LLM - Finance
GenAI Engineer Python LLM - Finance
Client Server
Shoreditch, East London (E1), EC2A
£140000 - £180000 per annum + benefits
GenAI Engineer / Software Developer (Python LLM RAG) London 12 month FTC to £180k - Are you a Senior Software Engineer with a strong knowledge of the capabilities of GenAI? You could be progressing your career in a hands-on role at a tech driven, global Asset Manager with multiple billions of dollars under management, on a 12 month Fixed term Contract. As a GenAI Engineer you'll join the Investment Technology Research team and work closely with Investment Analysts on a mix of prototyping, evaluation and engineering. The work is interesting and complex, spanning Python development, RAG and retrieval workflows, MCP and tool integrations, model evaluation and the engineering needed to turn promising ideas into reliable internal tools. You'll be at the intersection of platform engineering, data engineering and developer experience, with a strong emphasis on enabling others.
GenAI Engineer / Software Developer (Python LLM RAG) London 12 month FTC to £180k - Are you a Senior Software Engineer with a strong knowledge of the capabilities of GenAI? You could be progressing your career in a hands-on role at a tech driven, global Asset Manager with multiple billions of dollars under management, on a 12 month Fixed term Contract. As a GenAI Engineer you'll join the Investment Technology Research team and work closely with Investment Analysts on a mix of prototyping, evaluation and engineering. The work is interesting and complex, spanning Python development, RAG and retrieval workflows, MCP and tool integrations, model evaluation and the engineering needed to turn promising ideas into reliable internal tools. You'll be at the intersection of platform engineering, data engineering and developer experience, with a strong emphasis on enabling others.
PREMIUM
Related Jobs
Locations
- Shoreditch
- The City, City (EC2)
- The City, City (EC3)
- Fenny Lock
- St James
- Blackfriars
- Canary Wharf
- Charing Cross
- Euston
- Littlemore
- City of London
- Cambridge
- Central London
- West End
- East London
- Reading
- Milton Keynes
- Bracknell
- Harlow
- Oxford
- London
- Cambridgeshire
- Berkshire
- Buckinghamshire
- Oxfordshire
- Hampshire
- Hertfordshire
- Kent
- West Sussex
- Essex
- South East
- East Anglia