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11 Permanent API jobs in Aldermaston + 20 miles
358 exact matches jobs are outside your preferred location
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Location: London - 1x a month - Salary: Up to £120,000 (D.O.E) + benefits - Fruition Group are partnering with a high-growth Insurtech unicorn that's scaling its engineering function. This is a unique chance to work across both proven, revenue-generating products and greenfield initiatives that are reshaping the future of insurance. It's an ideal role for a driven Lead Engineer who thrives in ambitious environments and wants to make a tangible impact. As a Lead Backend Engineer, you'll take ownership of designing and scaling cloud-native backend systems. You'll work primarily with Python (FastAPI) and play a key role in shaping the architecture of microservices that support millions of users. Beyond hands-on development, you'll provide technical leadership, mentor team members, and influence strategic engineering decisions.
Location: London - 1x a month - Salary: Up to £120,000 (D.O.E) + benefits - Fruition Group are partnering with a high-growth Insurtech unicorn that's scaling its engineering function. This is a unique chance to work across both proven, revenue-generating products and greenfield initiatives that are reshaping the future of insurance. It's an ideal role for a driven Lead Engineer who thrives in ambitious environments and wants to make a tangible impact. As a Lead Backend Engineer, you'll take ownership of designing and scaling cloud-native backend systems. You'll work primarily with Python (FastAPI) and play a key role in shaping the architecture of microservices that support millions of users. Beyond hands-on development, you'll provide technical leadership, mentor team members, and influence strategic engineering decisions.
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Front End Games Developer - Hybrid Remote
Front End Games Developer - Hybrid Remote
VERTECH GROUP (UK) LTD
OX4, Oxford
From £55,000 to £75,000 per annum + Bonus + Benefits
Front End Game Developer - Location:Home Based / 1 day per week in Oxford - Salary:Circa 55K 75K + Bonus + Benefits - Senior Front End Games Developerrequired by fast-growing, Top Tech Company! This is a diverse, challenging role in a talented team where youll be building cutting-edge casino slot games, driving feature development, shaping the architecture, and mentoring junior developers * At least 5yrs development experience * Games development experience * Mobile-first mindset * HTML5, TypeScript * PixiJS, Phaser or similar * WebGL or Canvas 2D APIs * Git or similar * Maths, statistics, or physics background * 3D development experience - Tremendous opportunity offering plenty of scope for career progression in a friendly, innovative environment where youll be able to bring ideas, keep up-to-date with the latest technologies and enjoy a healthy work/life balance!
Front End Game Developer - Location:Home Based / 1 day per week in Oxford - Salary:Circa 55K 75K + Bonus + Benefits - Senior Front End Games Developerrequired by fast-growing, Top Tech Company! This is a diverse, challenging role in a talented team where youll be building cutting-edge casino slot games, driving feature development, shaping the architecture, and mentoring junior developers * At least 5yrs development experience * Games development experience * Mobile-first mindset * HTML5, TypeScript * PixiJS, Phaser or similar * WebGL or Canvas 2D APIs * Git or similar * Maths, statistics, or physics background * 3D development experience - Tremendous opportunity offering plenty of scope for career progression in a friendly, innovative environment where youll be able to bring ideas, keep up-to-date with the latest technologies and enjoy a healthy work/life balance!
FEATURED
Senior Full Stack C# .Net Developer - Hybrid Remote
Senior Full Stack C# .Net Developer - Hybrid Remote
VERTECH GROUP (UK) LTD
OX4, Oxford
From £70,000 to £85,000 per annum + Bonus + Benefits
Senior Full Stack C# .Net Developer - Location:Home based / 1 day per month in Oxford - Salary:Circa 70K 85K DOE + Benefits - Senior Full Stack C# .Net Developerrequired by a well-established and fast-growing Top Tech company! This is a varied, challenging role building mission-critical, user-facing applications used at scale. Youll be developing new features, contribute to key technical decisions, and helping to shape the quality of code across the team * At least 5yrs development experience * Experience with high-traffic, responsive apps and sites * Expertise in C# .Net Core * RESTful APIs * TypeScript &JavaScript * Frameworks: Angular, Vue, or React * HTML5 and CSS3 * Familiarity with CI/CD tools * Version control: Git or similar * SQL Server & MySQL - Tremendous opportunity offering plenty of scope for career progression in a friendly, innovative environment where
Senior Full Stack C# .Net Developer - Location:Home based / 1 day per month in Oxford - Salary:Circa 70K 85K DOE + Benefits - Senior Full Stack C# .Net Developerrequired by a well-established and fast-growing Top Tech company! This is a varied, challenging role building mission-critical, user-facing applications used at scale. Youll be developing new features, contribute to key technical decisions, and helping to shape the quality of code across the team * At least 5yrs development experience * Experience with high-traffic, responsive apps and sites * Expertise in C# .Net Core * RESTful APIs * TypeScript &JavaScript * Frameworks: Angular, Vue, or React * HTML5 and CSS3 * Familiarity with CI/CD tools * Version control: Git or similar * SQL Server & MySQL - Tremendous opportunity offering plenty of scope for career progression in a friendly, innovative environment where
FEATURED
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We're currently working with a growing SaaS company based in Banbury that are looking for a Senior Software Engineer skilled with C# ASP.NET, Angular, and SQL. This role will naturally grow in to a Lead Engineer position as the team grows. You will be working to develop and build their new payroll project, which will be rolling out nationally, and then internationally. This role is based in Banbury, and it will require you to be onsite a minimum of two days per week. * Professional software engineering experience (typically 5+ years) using C# / ASP.NET (Core & Framework) and modern JavaScript/TypeScript frameworks, particularly Angular (v8+). * Significant understanding and practical experience with relational databases (MySQL /PostgreSQL preferred). * Expertise in version control systems (Git) and branching strategies (Gitflow).
We're currently working with a growing SaaS company based in Banbury that are looking for a Senior Software Engineer skilled with C# ASP.NET, Angular, and SQL. This role will naturally grow in to a Lead Engineer position as the team grows. You will be working to develop and build their new payroll project, which will be rolling out nationally, and then internationally. This role is based in Banbury, and it will require you to be onsite a minimum of two days per week. * Professional software engineering experience (typically 5+ years) using C# / ASP.NET (Core & Framework) and modern JavaScript/TypeScript frameworks, particularly Angular (v8+). * Significant understanding and practical experience with relational databases (MySQL /PostgreSQL preferred). * Expertise in version control systems (Git) and branching strategies (Gitflow).
FEATURED
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Technical Client Implementation Analyst - Python and Derivatives
Technical Client Implementation Analyst - Python and Derivatives
CBSbutler Holdings Limited
EC1, City of London
£45000 - £70000 per annum + Bonus + Full Benefits
Global Financial Services Firm is hiring for a Technical Client Implementation Analyst / Specialist with strong analytical, in-depth Derivatives / Margining experience and knowledge and client services skills to be based in their London office. Financial Services experience is essential, with a strong understanding of the trading lifecycle, as well as technical skills in Python (writing queries and scripts) and APIs. This is a permanent role. They have a hybrid set-up of 2-3 days in the office. Salary ranges between £45K - £70K, depending on experience. This role plays a key part in ensuring smooth client onboarding and implementation, while supporting ongoing client success. Youll be involved in coordinating technical integrations, assisting with solution rollouts, and providing hands-on support throughout the client lifecycle.
Global Financial Services Firm is hiring for a Technical Client Implementation Analyst / Specialist with strong analytical, in-depth Derivatives / Margining experience and knowledge and client services skills to be based in their London office. Financial Services experience is essential, with a strong understanding of the trading lifecycle, as well as technical skills in Python (writing queries and scripts) and APIs. This is a permanent role. They have a hybrid set-up of 2-3 days in the office. Salary ranges between £45K - £70K, depending on experience. This role plays a key part in ensuring smooth client onboarding and implementation, while supporting ongoing client success. Youll be involved in coordinating technical integrations, assisting with solution rollouts, and providing hands-on support throughout the client lifecycle.
Title:Senior Software Engineer (Delphi & C#) Department: Procode IT - Location: Commutable distance of Chandlers Ford - Salary:Circa £55,878 + 15% discretionary bonus - Are you an established Senior Software Engineer with recent Delphi and C# experience? If so, this could be the role for you. About us - We are a dynamic software company. Established in 2006, with a visionof helping the energy and utilities sectors improve customer experience and lower their cost to serve,using smarter process automation. Are you curious about what the future in tech holds? Do you have the drive to want to deliver great solutions for customers? Then we have an exciting opportunity as a Senior Software Engineer, where we aim to provide you with a uniquely inclusive and diverse workplace, which showcases the extraordinary in all of us, by enabling you to be the best you can be.
Title:Senior Software Engineer (Delphi & C#) Department: Procode IT - Location: Commutable distance of Chandlers Ford - Salary:Circa £55,878 + 15% discretionary bonus - Are you an established Senior Software Engineer with recent Delphi and C# experience? If so, this could be the role for you. About us - We are a dynamic software company. Established in 2006, with a visionof helping the energy and utilities sectors improve customer experience and lower their cost to serve,using smarter process automation. Are you curious about what the future in tech holds? Do you have the drive to want to deliver great solutions for customers? Then we have an exciting opportunity as a Senior Software Engineer, where we aim to provide you with a uniquely inclusive and diverse workplace, which showcases the extraordinary in all of us, by enabling you to be the best you can be.
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Job Title: Senior Software Engineer (Mobile Apps iOS) Salary: Up to £75,000 - Location: Salisbury area (Hybrid / On-site) Hours: 37.5 per week - The Role - We are recruiting on behalf of our client for a Senior iOS Developer to join their in-house mobile apps team. The successful candidate will design, build, and maintain a high-quality native iOS application, taking features from concept through to delivery using Swift and SwiftUI. Working at a senior level, you will guide architectural decisions, ensure code quality, and mentor other developers. You will work closely with project managers, testers, and other engineering teams in an Agile environment. Key Responsibilities * Develop and maintain a native iOS app using Swift and SwiftUI. * Provide technical input on architecture, code quality, and testing strategies. * Mentor and support junior and mid-level developers
Job Title: Senior Software Engineer (Mobile Apps iOS) Salary: Up to £75,000 - Location: Salisbury area (Hybrid / On-site) Hours: 37.5 per week - The Role - We are recruiting on behalf of our client for a Senior iOS Developer to join their in-house mobile apps team. The successful candidate will design, build, and maintain a high-quality native iOS application, taking features from concept through to delivery using Swift and SwiftUI. Working at a senior level, you will guide architectural decisions, ensure code quality, and mentor other developers. You will work closely with project managers, testers, and other engineering teams in an Agile environment. Key Responsibilities * Develop and maintain a native iOS app using Swift and SwiftUI. * Provide technical input on architecture, code quality, and testing strategies. * Mentor and support junior and mid-level developers
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Contract Backend Developer - Python/Go - SC Cleared - Remote - 6 Months - Rate: Competitive (Outside IR35) Location: Remote/Hybrid (UK-based only) - 1-2 days per month in London - Clearance: Active SC Clearance required - Duration: 6 months (possible extension) A leading consultancy is seeking a Backend Developer with strong experience in Python and Go for a secure infrastructure automation project. * Python & Go backend development (APIs, microservices, automation tools) * AWS SDKs (boto3, aws-sdk-go-v2) - EC2, S3, IAM, Lambda, CloudWatch * LDAP, HashiCorp Vault, JIRA/Confluence, Kubernetes integration * CI/CD pipelines, Git, testing frameworks (pytest, unittest, testify, gomock) * Code quality tools: flake8, black, mypy, golangci-lint * Proven experience in backend development and cloud automation * Strong integration skills with enterprise tools and services
Contract Backend Developer - Python/Go - SC Cleared - Remote - 6 Months - Rate: Competitive (Outside IR35) Location: Remote/Hybrid (UK-based only) - 1-2 days per month in London - Clearance: Active SC Clearance required - Duration: 6 months (possible extension) A leading consultancy is seeking a Backend Developer with strong experience in Python and Go for a secure infrastructure automation project. * Python & Go backend development (APIs, microservices, automation tools) * AWS SDKs (boto3, aws-sdk-go-v2) - EC2, S3, IAM, Lambda, CloudWatch * LDAP, HashiCorp Vault, JIRA/Confluence, Kubernetes integration * CI/CD pipelines, Git, testing frameworks (pytest, unittest, testify, gomock) * Code quality tools: flake8, black, mypy, golangci-lint * Proven experience in backend development and cloud automation * Strong integration skills with enterprise tools and services
FEATURED
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Senior Salesforce Consultant / Senior Salesforce Developer / Senior Salesforce Programmer - Location: Hybrid (London / UK 23 days onsite) Salary: £75,000 - £90,000 Plus Benefits - We are hiring on behalf of our client for a Senior Salesforce Consultant to play a key role in an exciting organisation-wide Salesforce transformation. This role offers the opportunity to work across Sales Cloud, Service Cloud, Experience Cloud, and Marketing Cloud in a collaborative hybrid environment. Key Responsibilities * Lead end-to-end delivery across Sales Cloud, Service Cloud, Experience Cloud, and Marketing Cloud, from requirements gathering and solution design to configuration, development, testing, and deployment. * Deliver technical solutions in Salesforce including custom metadata, Lightning components, Apex code, APIs, and declarative automation.
Senior Salesforce Consultant / Senior Salesforce Developer / Senior Salesforce Programmer - Location: Hybrid (London / UK 23 days onsite) Salary: £75,000 - £90,000 Plus Benefits - We are hiring on behalf of our client for a Senior Salesforce Consultant to play a key role in an exciting organisation-wide Salesforce transformation. This role offers the opportunity to work across Sales Cloud, Service Cloud, Experience Cloud, and Marketing Cloud in a collaborative hybrid environment. Key Responsibilities * Lead end-to-end delivery across Sales Cloud, Service Cloud, Experience Cloud, and Marketing Cloud, from requirements gathering and solution design to configuration, development, testing, and deployment. * Deliver technical solutions in Salesforce including custom metadata, Lightning components, Apex code, APIs, and declarative automation.
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Senior Backend Engineer
Senior Backend Engineer
Ncounter LTD
W1, Central London
From £120,000 to £160,000 per annum Equity and package
Product-Focused Backend Engineer Functional Programming & Distributed Systems - London (Hybrid) | £120,000£160,000 + Equity - At Ncounter, were partnering with a cutting-edge AI company on a mission to redefine how professionals in highly regulated industries interact with complex, multi-modal data. Their platform empowers users to deploy custom no-code AI agents that produce verifiable outputs with full transparency - ensuring trust, compliance, and control remain central to every decision. As a Backend Engineer, youll join a growing team working at the forefront of AI infrastructure. This isnt just about clean code or strong delivery - its about ownership, product intuition, and building for scale. Youll be part of a lean, high-calibre engineering function where every member contributes to planning, testing, analysis, and execution.
Product-Focused Backend Engineer Functional Programming & Distributed Systems - London (Hybrid) | £120,000£160,000 + Equity - At Ncounter, were partnering with a cutting-edge AI company on a mission to redefine how professionals in highly regulated industries interact with complex, multi-modal data. Their platform empowers users to deploy custom no-code AI agents that produce verifiable outputs with full transparency - ensuring trust, compliance, and control remain central to every decision. As a Backend Engineer, youll join a growing team working at the forefront of AI infrastructure. This isnt just about clean code or strong delivery - its about ownership, product intuition, and building for scale. Youll be part of a lean, high-calibre engineering function where every member contributes to planning, testing, analysis, and execution.
London (Hybrid 1x Per week) Salary: Up to £100k + Benefits - 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 foster a culture of engineering excellence.
London (Hybrid 1x Per week) Salary: Up to £100k + Benefits - 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 foster a culture of engineering excellence.
Technical Business Analyst
Technical Business Analyst
Ncounter LTD
EC1, City of London
From £120,000 to £150,000 per annum Bonus and package
Ncounter is hiring a hybrid Technical Business Analyst / Project Manager to join a high-performance technology team delivering complex trading solutions across global markets. Youll play a pivotal role in shaping products that underpin real-time financial decision-making, working across engineering, research, and infrastructure groups. Whether your strengths lie in requirements analysis or delivery management, this role offers the chance to influence business-critical systems in a high-frequency trading environment. Where youll make an impact - Youll either join the analysis team, acting as the key translator between business goals and technical implementation, or take the reins on end-to-end project deliverydepending on your expertise and focus. * Capture and refine detailed business and technical requirements * Translate complex problems into structured, executable
Ncounter is hiring a hybrid Technical Business Analyst / Project Manager to join a high-performance technology team delivering complex trading solutions across global markets. Youll play a pivotal role in shaping products that underpin real-time financial decision-making, working across engineering, research, and infrastructure groups. Whether your strengths lie in requirements analysis or delivery management, this role offers the chance to influence business-critical systems in a high-frequency trading environment. Where youll make an impact - Youll either join the analysis team, acting as the key translator between business goals and technical implementation, or take the reins on end-to-end project deliverydepending on your expertise and focus. * Capture and refine detailed business and technical requirements * Translate complex problems into structured, executable
London (Hybrid 1x Per week) Salary: Up to £100k + Benefits - 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 foster a culture of engineering excellence.
London (Hybrid 1x Per week) Salary: Up to £100k + Benefits - 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 foster a culture of engineering excellence.
.Net Developer - Hybrid Remote
.Net Developer - Hybrid Remote
VERTECH GROUP (UK) LTD
KT14, West Byfleet
From £55,000 to £65,000 per annum + Benefits
.Net Developer Location: Flexible Hybrid Home / Byfleet Salary: Circa 55k 65k + Benefits .Net Developer required by fast-growing, technology-led company! This is a diverse, challenging role in a talented team where youll be responsible for developing a variety of complex projects * At least 3yrs development experience * Skills in C#, VB.Net * ASP.Net, Blazor, WPF * RESTful APIs Tremendous opportunity offering plenty of scope for career progression in a friendly, innovative environment where youll be able to keep up to date with emerging technologies and enjoy a healthy work/life balance! Apply now for FULL details!
.Net Developer Location: Flexible Hybrid Home / Byfleet Salary: Circa 55k 65k + Benefits .Net Developer required by fast-growing, technology-led company! This is a diverse, challenging role in a talented team where youll be responsible for developing a variety of complex projects * At least 3yrs development experience * Skills in C#, VB.Net * ASP.Net, Blazor, WPF * RESTful APIs Tremendous opportunity offering plenty of scope for career progression in a friendly, innovative environment where youll be able to keep up to date with emerging technologies and enjoy a healthy work/life balance! Apply now for FULL details!
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Exposure to Swift Vapor for server-side API development (desirable, not essential).
Exposure to Swift Vapor for server-side API development (desirable, not essential).
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Lead Performance Test Engineer
Lead Performance Test Engineer
Spectrum It Recruitment Limited
SO50, Eastleigh
£60000 - £65000.00 per annum
Practical skills in C#, Web API testing, Azure and modern test methodologies
Practical skills in C#, Web API testing, Azure and modern test methodologies
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Strong integration, E2E and API testing experience
Strong integration, E2E and API testing experience
PREMIUM
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5+ years experience in working with the .NET framework, particularly with ASP.NET Core, React/React Native, C#, Web API Experience developing REST API-driven mobile first web applications
5+ years experience in working with the .NET framework, particularly with ASP.NET Core, React/React Native, C#, Web API Experience developing REST API-driven mobile first web applications
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Experience in developing and deploying Cloud Native Applications using Azure PaaS Capabilities (App Services Plans, Key Vault, SQL Azure DB, AzureFunctions, Containers, AKS, Logic Apps, Service Bus, Event Grid, API Management) * Enterprise Integration Technologies such as Azure API Management, Logic Apps, Service Bus.
Experience in developing and deploying Cloud Native Applications using Azure PaaS Capabilities (App Services Plans, Key Vault, SQL Azure DB, AzureFunctions, Containers, AKS, Logic Apps, Service Bus, Event Grid, API Management) * Enterprise Integration Technologies such as Azure API Management, Logic Apps, Service Bus.
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Technical Architect, Azure
Technical Architect, Azure
ARC IT Recruitment Ltd
The City, EC3
Up to £95,000 per annum bonus + benefits
Azure, API, PaaS * In-depth knowledge of Azure cloud services (PaaS, Containers, AKS, Logic Apps, API Management, Service Bus, Event Grid).
Azure, API, PaaS * In-depth knowledge of Azure cloud services (PaaS, Containers, AKS, Logic Apps, API Management, Service Bus, Event Grid).
Experience with Power Automate and API development is a plus.
Experience with Power Automate and API development is a plus.
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.Net Developer
.Net Developer
Crowd Link Consulting Ltd
GU21, Woking
From £45,000 to £60,000 per annum Salary + Benefits + Bonus
Web API, HTML, CSS, Web Services, JQuery and JavaScript
Web API, HTML, CSS, Web Services, JQuery and JavaScript
Proficient in API design, development & production operation
Proficient in API design, development & production operation
Title: Senior Software Engineer (Driver/API)
Title: Senior Software Engineer (Driver/API)
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Experience with API design standards & integration patterns
Experience with API design standards & integration patterns
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