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46 Permanent API jobs in City of London + 20 miles
42 exact matches jobs are outside your preferred location
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Technical Architect - Fully Remote | Meaningful Social Impact - Are you passionate about designing technology that genuinely improves lives? Want to use your skills to shape digital services that make a difference - while working fully remotely? We're looking for a Lead Technical Architect to join a purpose-driven digital consultancy that partners with public sector organisations to build user-centred software and services with real social value. This is your chance to influence how essential services are delivered across the UK, while working in a culture that values flexibility, inclusivity, and people-powered transformation. What You'll Do - As a Lead Technical Architect, you'll play a key role in shaping digital solutions that serve communities and create lasting positive impact. * Design scalable, secure, user-centred technical architectures
Technical Architect - Fully Remote | Meaningful Social Impact - Are you passionate about designing technology that genuinely improves lives? Want to use your skills to shape digital services that make a difference - while working fully remotely? We're looking for a Lead Technical Architect to join a purpose-driven digital consultancy that partners with public sector organisations to build user-centred software and services with real social value. This is your chance to influence how essential services are delivered across the UK, while working in a culture that values flexibility, inclusivity, and people-powered transformation. What You'll Do - As a Lead Technical Architect, you'll play a key role in shaping digital solutions that serve communities and create lasting positive impact. * Design scalable, secure, user-centred technical architectures
FEATURED
Assist with API integration and monitoring using API Management platforms. * Understanding of WAF and API security basics.
Assist with API integration and monitoring using API Management platforms. * Understanding of WAF and API security basics.
FEATURED
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Application Support Analyst (Business Central)
Application Support Analyst (Business Central)
360 Resourcing
Slough (SL1), SL1 4DX
£40000.00 to £44000.00 per year Hybrid working, Bonus and superb Bene
Troubleshoot API connections, reviewing payloads, authentication, and performance to maintain stability.
Troubleshoot API connections, reviewing payloads, authentication, and performance to maintain stability.
FEATURED
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Senior Full Stack Software Engineer
Senior Full Stack Software Engineer
Bolt Technical Limited
Milton Keynes (MK1)
From £70,000 to £80,000 per annum
API design experience
API design experience
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IT Support Applications Manager - Power Automate or PowerBI
IT Support Applications Manager - Power Automate or PowerBI
Latcom
Thatcham, Berkshire
£50,000 per annum + gd benefits
Familiar with specified high-level programming languages (e.g. Power Automate, PowerBI), and integration techniques (e.g. API, Wonde).
Familiar with specified high-level programming languages (e.g. Power Automate, PowerBI), and integration techniques (e.g. API, Wonde).
Senior iOS Developer – Swift / Mobile Applications
Senior iOS Developer – Swift / Mobile Applications
Intelligent Talent Solutions Ltd
Bracknell (RG12)
From £70,000 to £90,000 per annum Pension, staff discounts, medical
Implement robust REST API integrations
Implement robust REST API integrations
Senior Android Developer – Kotlin / Mobile Applications
Senior Android Developer – Kotlin / Mobile Applications
Intelligent Talent Solutions Ltd
Bracknell (RG12)
From £68,000 to £88,000 per annum Pension, staff discounts, medical
Implement robust REST API integrations
Implement robust REST API integrations
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Network Automation Engineer Specialist (telecoms/ network)
Network Automation Engineer Specialist (telecoms/ network)
Talent Locker
Reading (RG1)
£60000 - £65000 per annum
Experience with API management platforms (Apigee, Kong, OpenShift API Management) and Web Application Firewalls (WAF) is highly desirable. * Implement and manage API Management solutions and Web Application Firewalls (WAF). * Experience with API management (Apigee, Kong, OpenShift API Management) and API lifecycle.
Experience with API management platforms (Apigee, Kong, OpenShift API Management) and Web Application Firewalls (WAF) is highly desirable. * Implement and manage API Management solutions and Web Application Firewalls (WAF). * Experience with API management (Apigee, Kong, OpenShift API Management) and API lifecycle.
FEATURED
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The role is around 50% Manuel and 50% automation with a mix of UI and API testing. * Perform exploratory and automated testing across API and UI * UI and API automation knowledge
The role is around 50% Manuel and 50% automation with a mix of UI and API testing. * Perform exploratory and automated testing across API and UI * UI and API automation knowledge
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Python fluency (NumPy, Pandas, Scikit-Learn, PyTorch) and solid TypeScript/API skills
Python fluency (NumPy, Pandas, Scikit-Learn, PyTorch) and solid TypeScript/API skills
FEATURED
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Front End Developer
Front End Developer
Anson Mccade
London
From £50,000 to £72,000 per annum + £7,000 tax free DV Bonus + 10% bon
Practical experience with Node.js and API integration
Practical experience with Node.js and API integration
PREMIUM
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Senior C# Developer - Location: London (Fully Onsite) Employment Type: Permanent - Salary: £50,000 - £70,000 (DOE) Visa Sponsorship: Not available - We're working with a London-based organisation that is looking to hire an experienced Senior C# Developer to join their engineering team in a fully onsite position. This role is ideal for someone who enjoys hands-on development, working closely with the business, and taking ownership of complex systems. The Role - As a Senior C# Developer, you'll be responsible for designing, developing, and maintaining business-critical applications built on C#/.NET and SQL. You'll play a key role in technical decision-making, improving code quality, and ensuring the reliability and performance of core systems. You'll work closely with other developers, QA, product owners, and non-technical stakeholders, contributing across the full software development ...
Senior C# Developer - Location: London (Fully Onsite) Employment Type: Permanent - Salary: £50,000 - £70,000 (DOE) Visa Sponsorship: Not available - We're working with a London-based organisation that is looking to hire an experienced Senior C# Developer to join their engineering team in a fully onsite position. This role is ideal for someone who enjoys hands-on development, working closely with the business, and taking ownership of complex systems. The Role - As a Senior C# Developer, you'll be responsible for designing, developing, and maintaining business-critical applications built on C#/.NET and SQL. You'll play a key role in technical decision-making, improving code quality, and ensuring the reliability and performance of core systems. You'll work closely with other developers, QA, product owners, and non-technical stakeholders, contributing across the full software development ...
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Salary up to £75,000 * Hybrid working - 3 days per week in Waterloo, London * Python, FastAPI, PostgreSQL, React or Next.js * End-to-end ownership across frontend and backend - We're working with an ambitious AI-driven organisation building advanced analytics products within the sports sector. Due to continued growth, they're looking for a Full Stack Engineer with 3+ years' experience to take ownership across both frontend and backend development. This is a role for someone who enjoys autonomy, thrives in a small team, and wants to help shape product and technical direction in a fast-evolving environment. * Hybrid working (3 days per week in Waterloo) * Ownership across the full development lifecycle * Exposure to AI-powered sports analytics products * High-impact role within a growing team - You'll be responsible for building and deploying modern, data-driven applications.
Salary up to £75,000 * Hybrid working - 3 days per week in Waterloo, London * Python, FastAPI, PostgreSQL, React or Next.js * End-to-end ownership across frontend and backend - We're working with an ambitious AI-driven organisation building advanced analytics products within the sports sector. Due to continued growth, they're looking for a Full Stack Engineer with 3+ years' experience to take ownership across both frontend and backend development. This is a role for someone who enjoys autonomy, thrives in a small team, and wants to help shape product and technical direction in a fast-evolving environment. * Hybrid working (3 days per week in Waterloo) * Ownership across the full development lifecycle * Exposure to AI-powered sports analytics products * High-impact role within a growing team - You'll be responsible for building and deploying modern, data-driven applications.
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£55,000 £65,000 DOE | Hybrid Working (1x day a month office) Are you a seasoned developer with a passion for building robust, real-time communications platforms? Looking for a role where you can work on complex, enterprise-grade systems while still being close to the technical detail? This is an opportunity to join a well-established technology business with a strong reputation in communications and cloud-based solutions. Youll be part of a small, highly skilled development team working on the evolution of a large-scale SIP platform and its associated APIs, with plenty of scope to influence design, tooling, and future direction. The Role - Working closely with the Development Manager, youll play a key role in enhancing and extending an existing SIP and VoIP platform used in production environments.
£55,000 £65,000 DOE | Hybrid Working (1x day a month office) Are you a seasoned developer with a passion for building robust, real-time communications platforms? Looking for a role where you can work on complex, enterprise-grade systems while still being close to the technical detail? This is an opportunity to join a well-established technology business with a strong reputation in communications and cloud-based solutions. Youll be part of a small, highly skilled development team working on the evolution of a large-scale SIP platform and its associated APIs, with plenty of scope to influence design, tooling, and future direction. The Role - Working closely with the Development Manager, youll play a key role in enhancing and extending an existing SIP and VoIP platform used in production environments.
We are seeking an experiencedServiceNow Lead Developerto design, develop, and implement scalable solutions on the ServiceNow platform. The ideal candidate will have deep expertise inCMDB, ITOM, TSOM, and TSM modules, along with strong hands-on development experience in ServiceNow scripting, integrations, and platform architecture. The candidate will play a key role indriving ServiceNow platform development, CMDB maturity, IT Operations automation, and telecom service operations transformation, while mentoring junior developers and collaborating with cross-functional teams. Key Responsibilities - ServiceNow Development - Design, develop, and implement solutions on theServiceNow platformaligned with business requirements. oBusiness Rules - oScript Includes - oClient Scripts - oUI Policies - oUI Actions - oFlow Designer - oWorkflows
We are seeking an experiencedServiceNow Lead Developerto design, develop, and implement scalable solutions on the ServiceNow platform. The ideal candidate will have deep expertise inCMDB, ITOM, TSOM, and TSM modules, along with strong hands-on development experience in ServiceNow scripting, integrations, and platform architecture. The candidate will play a key role indriving ServiceNow platform development, CMDB maturity, IT Operations automation, and telecom service operations transformation, while mentoring junior developers and collaborating with cross-functional teams. Key Responsibilities - ServiceNow Development - Design, develop, and implement solutions on theServiceNow platformaligned with business requirements. oBusiness Rules - oScript Includes - oClient Scripts - oUI Policies - oUI Actions - oFlow Designer - oWorkflows
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London | 4 days onsite - Up to £140,000 - Build the platform behind production AI - We're partnered with a high-growth technology business investing heavily in AI, platform engineering, and cloud infrastructure. They're now hiring a Senior AI Platform Engineer to help build the systems that take AI from prototype to production. This is not a role focused on AI experimentation or one-off GenAI demos. It's a chance to build the core platform, tooling, and infrastructure that enables teams to deploy LLM-powered products, agentic workflows, and retrieval systems in a way that's scalable, secure, and production-ready. * Building the core AI platform for LLM-powered products and internal AI tooling * Creating the APIs, services, and developer tooling that make AI easy to adopt across teams * Designing and operating agent-based and multi-model workflows
London | 4 days onsite - Up to £140,000 - Build the platform behind production AI - We're partnered with a high-growth technology business investing heavily in AI, platform engineering, and cloud infrastructure. They're now hiring a Senior AI Platform Engineer to help build the systems that take AI from prototype to production. This is not a role focused on AI experimentation or one-off GenAI demos. It's a chance to build the core platform, tooling, and infrastructure that enables teams to deploy LLM-powered products, agentic workflows, and retrieval systems in a way that's scalable, secure, and production-ready. * Building the core AI platform for LLM-powered products and internal AI tooling * Creating the APIs, services, and developer tooling that make AI easy to adopt across teams * Designing and operating agent-based and multi-model workflows
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Company Overview - We are working with an innovative organisation that recognises the increasing complexity of project delivery. Since 2013, our client has been helping companies of all sizes improve the way projects are delivered. Their mission is to become the number one provider of innovative project solutions, driven by a community of experienced, caring, and passionate professionals who are committed to improving project delivery. Why Join Our Client? Our client is currently in an exciting phase of growth, making this an excellent time to join their journey. They are building something special-scaling the business while maintaining a strong people-first approach. Investment in their teams is a key priority, creating an environment where development is encouraged and individuals are supported to grow with the organisation.
Company Overview - We are working with an innovative organisation that recognises the increasing complexity of project delivery. Since 2013, our client has been helping companies of all sizes improve the way projects are delivered. Their mission is to become the number one provider of innovative project solutions, driven by a community of experienced, caring, and passionate professionals who are committed to improving project delivery. Why Join Our Client? Our client is currently in an exciting phase of growth, making this an excellent time to join their journey. They are building something special-scaling the business while maintaining a strong people-first approach. Investment in their teams is a key priority, creating an environment where development is encouraged and individuals are supported to grow with the organisation.
QA Engineer – Mobile Apps / Test Automation
QA Engineer – Mobile Apps / Test Automation
Intelligent Talent Solutions Ltd
Bracknell (RG12)
From £55,000 to £75,000 per annum Pension, staff discounts, medical
QA Engineer Mobile Apps & Automation - Hybrid Working 3 Days Office | Bracknell Area - Are you passionate about building high-quality mobile applications that genuinely improve peoples health and wellbeing? Were partnering with an innovative medical technology company developing digital products and connected mobile applications used by customers worldwide. Theyre looking for a Quality Engineer with strong mobile testing and automation experience to help ensure their digital health platforms remain reliable, secure and safe for real-world use. Youll play a key role testing iOS and Android applications, cloud APIs and backend services, ensuring new releases meet the highest quality and regulatory standards. The Opportunity - Working closely with software engineers, business analysts, product teams and regulatory specialists, youll be responsible for ensuring mobile and cloud ...
QA Engineer Mobile Apps & Automation - Hybrid Working 3 Days Office | Bracknell Area - Are you passionate about building high-quality mobile applications that genuinely improve peoples health and wellbeing? Were partnering with an innovative medical technology company developing digital products and connected mobile applications used by customers worldwide. Theyre looking for a Quality Engineer with strong mobile testing and automation experience to help ensure their digital health platforms remain reliable, secure and safe for real-world use. Youll play a key role testing iOS and Android applications, cloud APIs and backend services, ensuring new releases meet the highest quality and regulatory standards. The Opportunity - Working closely with software engineers, business analysts, product teams and regulatory specialists, youll be responsible for ensuring mobile and cloud ...
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£100k - Equity | Remote Flexibility - Typescript | Azure | Python | LLM | Terraform - The Company - We’re working with an early-stage technology company bringing digital transformation to traditionally manual supply chain and product data processes. They are looking for an experienced engineer who can balance hands-on engineering with technical strategy as the business moves through its next phase of growth. This role suits someone who enjoys operating in a small but growing team, is motivated by building solutions, solving complex problems, and is comfortable rolling up their sleeves to deliver. The environment is fast-paced, where priorities can evolve quickly and ambiguity is often part of the journey. The successful candidate will be excited by the autonomy of an early-stage environment and the opportunity to shape the technical direction of a high-potential B2B SaaS platform.
£100k - Equity | Remote Flexibility - Typescript | Azure | Python | LLM | Terraform - The Company - We’re working with an early-stage technology company bringing digital transformation to traditionally manual supply chain and product data processes. They are looking for an experienced engineer who can balance hands-on engineering with technical strategy as the business moves through its next phase of growth. This role suits someone who enjoys operating in a small but growing team, is motivated by building solutions, solving complex problems, and is comfortable rolling up their sleeves to deliver. The environment is fast-paced, where priorities can evolve quickly and ambiguity is often part of the journey. The successful candidate will be excited by the autonomy of an early-stage environment and the opportunity to shape the technical direction of a high-potential B2B SaaS platform.
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Oracle Cloud Payroll Data Migration Consultant
Oracle Cloud Payroll Data Migration Consultant
Sanderson Government and Defence
London
£400 - £412 per day
Location: Home-based with occasional travel to London - Start Date: Mid-May | Duration: 12 months - Daily Rate: £412 - Sector: Public Industry - Health | SC Clearance Required - Eligibility: UK Nationals with 5+ years residency - We are seeking a highly skilled Oracle Cloud Payroll Data Migration Consultant to lead full-cycle data migration workstreams, ensuring data integrity, accuracy, and successful go-live delivery. * Lead end-to-end Oracle Payroll Cloud data migration, including elements, balances, costing, fast formulas, and HCM objects. * Use HDL, HCM Extracts, Spreadsheet Loaders, HSDL, Payroll Batch Loader, FBDL, REST APIs, and SQL for migration and validation. * Prepare and maintain mapping specifications, data dictionaries, reconciliation packs, and documentation for multiple migration cycles. * Support SIT, UAT, mock migrations, parallel payroll runs, cutover planning, and ...
Location: Home-based with occasional travel to London - Start Date: Mid-May | Duration: 12 months - Daily Rate: £412 - Sector: Public Industry - Health | SC Clearance Required - Eligibility: UK Nationals with 5+ years residency - We are seeking a highly skilled Oracle Cloud Payroll Data Migration Consultant to lead full-cycle data migration workstreams, ensuring data integrity, accuracy, and successful go-live delivery. * Lead end-to-end Oracle Payroll Cloud data migration, including elements, balances, costing, fast formulas, and HCM objects. * Use HDL, HCM Extracts, Spreadsheet Loaders, HSDL, Payroll Batch Loader, FBDL, REST APIs, and SQL for migration and validation. * Prepare and maintain mapping specifications, data dictionaries, reconciliation packs, and documentation for multiple migration cycles. * Support SIT, UAT, mock migrations, parallel payroll runs, cutover planning, and ...
FEATURED
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Delphi Developer
Delphi Developer
Octad Recruitment Consultants (Octad Ltd )
Wickford (SS11)
From £50,000 to £70,000 per annum Good Benefits
We are seeking an experienced Delphi / SQL Developerto join our client's growing development team and work on large-scale, business-critical enterprise applications used by global clients. This is a senior technical role focused on maintaining, enhancing, and modernising a complex Delphi-based system with a strong SQL Server backend. If you enjoy solving complex problems, working with mature codebases, and contributing to long-term system stability, this role will suit you perfectly. Key Responsibilities * Maintain, support, and enhance existing Delphi enterprise applications. * Diagnose and resolve complex defects, performance issues, and system bottlenecks. * Work closely with business users to translate requirements into technical solutions. * Produce clear documentation for updates, fixes, and new features. * Participate in sprint planning, estimation, and code reviews.
We are seeking an experienced Delphi / SQL Developerto join our client's growing development team and work on large-scale, business-critical enterprise applications used by global clients. This is a senior technical role focused on maintaining, enhancing, and modernising a complex Delphi-based system with a strong SQL Server backend. If you enjoy solving complex problems, working with mature codebases, and contributing to long-term system stability, this role will suit you perfectly. Key Responsibilities * Maintain, support, and enhance existing Delphi enterprise applications. * Diagnose and resolve complex defects, performance issues, and system bottlenecks. * Work closely with business users to translate requirements into technical solutions. * Produce clear documentation for updates, fixes, and new features. * Participate in sprint planning, estimation, and code reviews.
.NET Developer
.NET Developer
Octad Recruitment Consultants (Octad Ltd )
Wickford (SS11)
From £35,000 to £55,000 per annum Good Benefits
Were looking for a talented .NET Windows Developerto help build, modernise, and support business-critical Windows applications for this fantastic Software Consultancy. If you enjoy C#, SQL Server, system integrations, and transforming legacy code into clean, modern.NET solutions, this is a great opportunity to make a real impact. Work with:C#, .NET / .NET Core, WinForms/WPF, SQL Server, REST APIs, Azure Ideal for:Developers who love problem-solving, clean architecture, and delivering production-ready software. If youre ready to take on meaningful technical challenges in a supportive, forward-thinking team, wed love to hear from you if you have 3 years commercial experience. This role is hybrid with Monday and Wednesday in the office
Were looking for a talented .NET Windows Developerto help build, modernise, and support business-critical Windows applications for this fantastic Software Consultancy. If you enjoy C#, SQL Server, system integrations, and transforming legacy code into clean, modern.NET solutions, this is a great opportunity to make a real impact. Work with:C#, .NET / .NET Core, WinForms/WPF, SQL Server, REST APIs, Azure Ideal for:Developers who love problem-solving, clean architecture, and delivering production-ready software. If youre ready to take on meaningful technical challenges in a supportive, forward-thinking team, wed love to hear from you if you have 3 years commercial experience. This role is hybrid with Monday and Wednesday in the office
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Applied AI / Automation Engineer - Location: London (Hybrid) Salary: £70k + (DOE) The Role - A London-based financial services firm operating within the hedge fund and asset management space is seeking an Applied AI / Automation Engineer to join its Data Science function. This role will focus on designing and building an intelligent reporting and automation platform to support fund operations and administration teams. The successful candidate will work closely with both technical and operational stakeholders to deliver measurable efficiency gains and scalable automation solutions. The overall objective is to modernise reporting production and reconciliation processes through the application of modern data engineering practices, AI-enabled automation, and agent-based workflows. This is a hands-on engineering role focused on building reliable, production-grade systems within a ...
Applied AI / Automation Engineer - Location: London (Hybrid) Salary: £70k + (DOE) The Role - A London-based financial services firm operating within the hedge fund and asset management space is seeking an Applied AI / Automation Engineer to join its Data Science function. This role will focus on designing and building an intelligent reporting and automation platform to support fund operations and administration teams. The successful candidate will work closely with both technical and operational stakeholders to deliver measurable efficiency gains and scalable automation solutions. The overall objective is to modernise reporting production and reconciliation processes through the application of modern data engineering practices, AI-enabled automation, and agent-based workflows. This is a hands-on engineering role focused on building reliable, production-grade systems within a ...
£Up to £80,000 GBP - Transport Allowance - Hybrid WORKING - Location: London; Manchester; Bristol, Manchester, North West - United Kingdom Type: Permanent - The Role - Data Engineer (DV Cleared) Join a consultancy recognised as a UK Great Place to Work year after year - a distinction that reflects its commitment to inclusion, engineering excellence and meaningful, purpose-led work across complex transformation programmes. Our client is a globally respected digital, data and technology consultancy operating at the intersection of strategy, innovation and advanced engineering. With over 4,000 experts across multiple sectors including defence, health, financial services and government, the client delivers large-scale transformation in environments where quality, agility and impact truly matter. As a Data Engineer, you will play a critical role within the client's Digital & Data ...
£Up to £80,000 GBP - Transport Allowance - Hybrid WORKING - Location: London; Manchester; Bristol, Manchester, North West - United Kingdom Type: Permanent - The Role - Data Engineer (DV Cleared) Join a consultancy recognised as a UK Great Place to Work year after year - a distinction that reflects its commitment to inclusion, engineering excellence and meaningful, purpose-led work across complex transformation programmes. Our client is a globally respected digital, data and technology consultancy operating at the intersection of strategy, innovation and advanced engineering. With over 4,000 experts across multiple sectors including defence, health, financial services and government, the client delivers large-scale transformation in environments where quality, agility and impact truly matter. As a Data Engineer, you will play a critical role within the client's Digital & Data ...
PREMIUM
Essential Skills Core AWS Services: Proficiency / understanding of key AWS services listed below:-S3- Athena- Glue- Lambda- DynamoDB-OpenSearch- CloudFormation- API Gateway- ECS- CloudWatch
Essential Skills Core AWS Services: Proficiency / understanding of key AWS services listed below:-S3- Athena- Glue- Lambda- DynamoDB-OpenSearch- CloudFormation- API Gateway- ECS- CloudWatch