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92 Permanent API jobs in City of London + 20 miles
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Senior Node.js Developer
Senior Node.js Developer
ARC IT Recruitment Ltd
SW1V, South West London, SW1W 9SJ
Up to £100,000 per annum
Build and implement new API systems integrating with ferry operators, third-party service providers, and more.
Build and implement new API systems integrating with ferry operators, third-party service providers, and more.
C#, ASP.NET MVC, Web Services/ASP.NET Web API , REST API Asp.Net Core MS SQL server /PostgreSQL Entity Framework /LINQ Knowledge of ASP.NET Core and Client-side Frameworks (jQuery, Angular) Azure DevOps, Git repository and CI/CD Docker/Kubernetes Linux/Micro-Services Architecture - Experience planning and mapping out API integrations.
C#, ASP.NET MVC, Web Services/ASP.NET Web API , REST API Asp.Net Core MS SQL server /PostgreSQL Entity Framework /LINQ Knowledge of ASP.NET Core and Client-side Frameworks (jQuery, Angular) Azure DevOps, Git repository and CI/CD Docker/Kubernetes Linux/Micro-Services Architecture - Experience planning and mapping out API integrations.
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ServiceNow Developer
ServiceNow Developer
83zero Limited
EC1, City of London
£60000 - £70000 per annum + Perks, Healthcare Options and Bens
Strong knowledge of JavaScript, HTML, CSS, Glide API, Flow Designer
Strong knowledge of JavaScript, HTML, CSS, Glide API, Flow Designer
Exposure to OpenAI API or other modern AI/ML integrations.
Exposure to OpenAI API or other modern AI/ML integrations.
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Proficiency in at least one major API testing framework - Experience withAzure (APIM, Azure Functions, API Services), React/React-Native and.NET Core
Proficiency in at least one major API testing framework - Experience withAzure (APIM, Azure Functions, API Services), React/React-Native and.NET Core
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Automation Lead (Power Automate)
Automation Lead (Power Automate)
Robert Half
EC1, City of London
£55000 - £65000 per annum + Bonus & Benefits
Integrate data sources including Microsoft Graph API, Dataverse, and SQL * Hands-on experience with Graph API, Dataverse, and SQL
Integrate data sources including Microsoft Graph API, Dataverse, and SQL * Hands-on experience with Graph API, Dataverse, and SQL
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API Development:Experience building data-centric APIs, especially withFastAPIon serverless platforms likeGoogle App Engine.
API Development:Experience building data-centric APIs, especially withFastAPIon serverless platforms likeGoogle App Engine.
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Conduct comprehensive penetration tests: Execute internal and external network penetration tests, web application penetration tests, mobile application penetration tests, API penetration tests, cloud security assessments, and social engineering simulations.
Conduct comprehensive penetration tests: Execute internal and external network penetration tests, web application penetration tests, mobile application penetration tests, API penetration tests, cloud security assessments, and social engineering simulations.
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Senior Data Engineer
Senior Data Engineer
I3 Resourcing Limited
The City, EC3V 3ND
£70000 - £80000 per annum + + EXCELLENT BONUS + BENEFITS
Extensive experience in AWS services, e.g. EC2, S3, RDS, DynamoDB, Redshift, Lambda, API Gateway
Extensive experience in AWS services, e.g. EC2, S3, RDS, DynamoDB, Redshift, Lambda, API Gateway
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Software Developer (Microsoft Stack)
Software Developer (Microsoft Stack)
Solus Accident Repair Centres
North London, London
GBP £35,000.00/Yr. - GBP £50,000.00/Yr.
Work across a wide range of technologies, across web, mobile apps, API, backend, and databases which are currently hosted within Azure.
Work across a wide range of technologies, across web, mobile apps, API, backend, and databases which are currently hosted within Azure.
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Software Developer-MS-Stack
Software Developer-MS-Stack
Solus Accident Repair Centres
North London, London
GBP £35,000.00/Yr. - GBP £50,000.00/Yr.
Work across a wide range of technologies, across web, mobile apps, API, backend, and databases which are currently hosted within Azure.
Work across a wide range of technologies, across web, mobile apps, API, backend, and databases which are currently hosted within Azure.
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Implement and maintain API integrations
Implement and maintain API integrations
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Global Claims IT Leader
Global Claims IT Leader
MARSH CORPORATE SERVICES LIMITED
The City, EC3R 5BU
Pension Scheme, Private Health Insurance & life insurance
Being a cross-functional collaborator interfacing with MMC Enterprise Technology partners, Marsh-Operations, and Transformation Office will come naturally to you building a new set of reusable IT Microservices connected via a well-defined API structure.
Being a cross-functional collaborator interfacing with MMC Enterprise Technology partners, Marsh-Operations, and Transformation Office will come naturally to you building a new set of reusable IT Microservices connected via a well-defined API structure.
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Build and work with modern API and microservices architectures
Build and work with modern API and microservices architectures
NEWEQUALITY BOOST
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Build and work with modern API and microservices architectures
Build and work with modern API and microservices architectures
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Senior Full Stack Web Developer - ONSITE
Senior Full Stack Web Developer - ONSITE
Profile 29
IG10, Loughton
From £70,000 to £120,000 per annum + benefits (see advert)
As a member of their team, you will have the opportunity to work on their public-facing API and back-office websites in a Test-Driven Agile environment.
As a member of their team, you will have the opportunity to work on their public-facing API and back-office websites in a Test-Driven Agile environment.
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Good understanding of API integration and data flow between front-end and back-end.
Good understanding of API integration and data flow between front-end and back-end.
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Client Solutions Architect - Salary: Up to £116K + Bonus - Location: London 2 days per week - Were hiring a Solutions Architect for a global leader in loyalty and customer engagement. This is a high-impact, client-facing role for someone who thrives at the intersection of strategy, software engineering, and stakeholder collaboration. Youll partner directly with enterprise clients to shape technical strategy, design scalable solutions, and build innovative integrations. Whether in pre-sales or delivery, your work will blend commercial impact with technical excellence. This isnt a hands-off role were looking for a hands-on Engineer turned Solutions Architect who still loves to code. Youll lead from the front, whether its building PoCs, architecting systems across modern stacks (TypeScript, AWS, Kubernetes), or aligning with internal engineering teams to deliver real cli
Client Solutions Architect - Salary: Up to £116K + Bonus - Location: London 2 days per week - Were hiring a Solutions Architect for a global leader in loyalty and customer engagement. This is a high-impact, client-facing role for someone who thrives at the intersection of strategy, software engineering, and stakeholder collaboration. Youll partner directly with enterprise clients to shape technical strategy, design scalable solutions, and build innovative integrations. Whether in pre-sales or delivery, your work will blend commercial impact with technical excellence. This isnt a hands-off role were looking for a hands-on Engineer turned Solutions Architect who still loves to code. Youll lead from the front, whether its building PoCs, architecting systems across modern stacks (TypeScript, AWS, Kubernetes), or aligning with internal engineering teams to deliver real cli
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Lead Data Architect
Lead Data Architect
Anson Mccade
WC1, Central London, W C1R
GBP 75,000.00 - 83,000.00 per year;GBP 67,000.00 per year;GBP 76,000.0
£75,000 - 83,000 GBP - Hybrid WORKING - Location: Central London, Greater London - United Kingdom Type: Permanent - Locations: Leeds, Manchester, Birmingham, Bristol, Glasgow, or London (Hybrid - up to 2 days on-site per week, remainder remote) Salary: £67,000 - £76,000 (non-London) / Up to £83,000 (London) + Benefits - A respected digital consultancy is hiring a Lead Data Architect to join its growing Data Engineering practice. Known for delivering modern, human-centred services across public and private sectors, this organisation supports clients through meaningful transformation by combining data, design, and engineering. This role is ideal for experienced architects who enjoy shaping cloud-native data platforms, working in multidisciplinary teams, and embedding data governance and architectural rigour across complex service ecosystems.
£75,000 - 83,000 GBP - Hybrid WORKING - Location: Central London, Greater London - United Kingdom Type: Permanent - Locations: Leeds, Manchester, Birmingham, Bristol, Glasgow, or London (Hybrid - up to 2 days on-site per week, remainder remote) Salary: £67,000 - £76,000 (non-London) / Up to £83,000 (London) + Benefits - A respected digital consultancy is hiring a Lead Data Architect to join its growing Data Engineering practice. Known for delivering modern, human-centred services across public and private sectors, this organisation supports clients through meaningful transformation by combining data, design, and engineering. This role is ideal for experienced architects who enjoy shaping cloud-native data platforms, working in multidisciplinary teams, and embedding data governance and architectural rigour across complex service ecosystems.
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Senior Python Developer - Hybrid Remote
Senior Python Developer - Hybrid Remote
VERTECH GROUP (UK) LTD
NW3, North West London
From £90,000 to £97,000 per annum + Benefits
Senior Python Developer - Location: Hybrid - 3 days remote / 2 days in NW London - Salary: Circa 90K 97K + Benefits - Senior Python Developer required by a fast-growing, Top Tech Company! This is a varied, challenging role within a talented team, where youll focus on building scalable, reliable backend systems while also sharing knowledge and guiding less experienced developers where needed * Solid background in backend development using Python (Flask, FastAPI, or similar) * Good skills in Google Cloud Platform (GCP) * Experience developing RESTful APIs * Familiarity with Cloud Functions and Cloud Run * Skilled in Docker and/or Kubernetes * Understanding of CI/CD processes * Strong grasp of clean code practices and scalable architecture * Excellent communication and collaboration skills - Tremendous opportunity to be part of a supportive, innovative environment with c
Senior Python Developer - Location: Hybrid - 3 days remote / 2 days in NW London - Salary: Circa 90K 97K + Benefits - Senior Python Developer required by a fast-growing, Top Tech Company! This is a varied, challenging role within a talented team, where youll focus on building scalable, reliable backend systems while also sharing knowledge and guiding less experienced developers where needed * Solid background in backend development using Python (Flask, FastAPI, or similar) * Good skills in Google Cloud Platform (GCP) * Experience developing RESTful APIs * Familiarity with Cloud Functions and Cloud Run * Skilled in Docker and/or Kubernetes * Understanding of CI/CD processes * Strong grasp of clean code practices and scalable architecture * Excellent communication and collaboration skills - Tremendous opportunity to be part of a supportive, innovative environment with c
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Java Quantitative Developer Low Latency
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.
A growing B2B FinTech is looking for a Senior Backend Engineer to help reshape its platform for scale. Youll join a collaborative engineering team delivering secure, high-performance APIs and backend services that power global business payments. What Youll Do * Build and maintain clean, well-tested APIs and services in C#/.NET * Contribute to a modular, microservices-based architecture * Work across the stack with engineers, QA, DevOps, and Product * Lead on code quality, performance, and engineering best practices * Support a shift toward better automation, monitoring, and CI/CD - Tech Snapshot * .NET Core / C# / EF Core * SQL Server, RESTful APIs, DDD patterns * Azure, Docker, CI/CD pipelines * Messaging with NServiceBus or similar * TDD, Git, modern SDLC practices - What Were Looking For * Strong backend experience in C#/.NET
A growing B2B FinTech is looking for a Senior Backend Engineer to help reshape its platform for scale. Youll join a collaborative engineering team delivering secure, high-performance APIs and backend services that power global business payments. What Youll Do * Build and maintain clean, well-tested APIs and services in C#/.NET * Contribute to a modular, microservices-based architecture * Work across the stack with engineers, QA, DevOps, and Product * Lead on code quality, performance, and engineering best practices * Support a shift toward better automation, monitoring, and CI/CD - Tech Snapshot * .NET Core / C# / EF Core * SQL Server, RESTful APIs, DDD patterns * Azure, Docker, CI/CD pipelines * Messaging with NServiceBus or similar * TDD, Git, modern SDLC practices - What Were Looking For * Strong backend experience in C#/.NET
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Lead Engineer
Lead Engineer
GH Engage Limited
The City, EC3
£55000 - £57500 per annum + 9% Pension, Medical, 25 days annual leave
Maintenance | Fit Outs | Permits to Work £55,000/annum + bonus | Exceptional client-side benefits | Client Side - 13 Month Fixed-Term-Contract - GH Engage are currently seeking an experienced Lead Engineer with a background in electrical / mechanical engineering maintenance for a role in the City of London. As a Lead Engineer, you will support the maintenance team and Fit-Out Supervisor in managing tenant and landlord fit-out projects, as well as performing maintenance, diagnostics, and fault finding on HVAC and electrical plant. * You will work closely with tenants, contractors, and consultants to monitor maintenance works on landlord plant and equipment, including electrical, mechanical, water treatment, and HVAC systems. * Review contractor and tenant risk assessments and method statements, monitor permits to work, and control access to plant areas.
Maintenance | Fit Outs | Permits to Work £55,000/annum + bonus | Exceptional client-side benefits | Client Side - 13 Month Fixed-Term-Contract - GH Engage are currently seeking an experienced Lead Engineer with a background in electrical / mechanical engineering maintenance for a role in the City of London. As a Lead Engineer, you will support the maintenance team and Fit-Out Supervisor in managing tenant and landlord fit-out projects, as well as performing maintenance, diagnostics, and fault finding on HVAC and electrical plant. * You will work closely with tenants, contractors, and consultants to monitor maintenance works on landlord plant and equipment, including electrical, mechanical, water treatment, and HVAC systems. * Review contractor and tenant risk assessments and method statements, monitor permits to work, and control access to plant areas.
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About the Company - You'll be joining a global leader in real estate services and technology solutions. Known for combining deep market expertise with cutting-edge innovation, this business is committed to modernising how property and investment decisions are made. You'll be part of a collaborative, forward-thinking environment that values creativity, accountability, and growth-where your contributions will directly shape the future of real estate technology. Role Responsibilities * Architect, build, and optimise scalable ETL pipelines for diverse datasets. * Onboard, document, and curate external datasets for internal use. * Perform data validation, forensic analysis, and troubleshooting. * Deliver high-quality, maintainable Python code and participate in peer reviews. * Collaborate with stakeholders and researchers to support analytics and product development.
About the Company - You'll be joining a global leader in real estate services and technology solutions. Known for combining deep market expertise with cutting-edge innovation, this business is committed to modernising how property and investment decisions are made. You'll be part of a collaborative, forward-thinking environment that values creativity, accountability, and growth-where your contributions will directly shape the future of real estate technology. Role Responsibilities * Architect, build, and optimise scalable ETL pipelines for diverse datasets. * Onboard, document, and curate external datasets for internal use. * Perform data validation, forensic analysis, and troubleshooting. * Deliver high-quality, maintainable Python code and participate in peer reviews. * Collaborate with stakeholders and researchers to support analytics and product development.
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Senior React Developer / Front End Engineer (React TypeScript Data Visualisation) London to £80k - Are you a skilled Software Developer with strong React and Data Visualisation skills combined with a good appreciation of financial markets and technology? You could be joining a growing, global, Fintech services company that has seen 30-40% year on year growth for the past 10 years and has ambitious growth plans. As a Senior React Developer you'll design and develop new features and enhancements to the front end of the platform with a focus on real-time data visualisation on business critical systems using React. You'll collaborate with backend engineers to build complex financial products. You'll join the team in Central London three days a week with flexibility to work from home the other two days.
Senior React Developer / Front End Engineer (React TypeScript Data Visualisation) London to £80k - Are you a skilled Software Developer with strong React and Data Visualisation skills combined with a good appreciation of financial markets and technology? You could be joining a growing, global, Fintech services company that has seen 30-40% year on year growth for the past 10 years and has ambitious growth plans. As a Senior React Developer you'll design and develop new features and enhancements to the front end of the platform with a focus on real-time data visualisation on business critical systems using React. You'll collaborate with backend engineers to build complex financial products. You'll join the team in Central London three days a week with flexibility to work from home the other two days.
NEWPREMIUM
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