26 to 50 of 269 API Development Jobs in the UK

maintain full-stack applications – Build robust, scalable applications using Python (FastAPI/Flask), and ReactJS following best practices and design patterns• Contribute to the development lifecycle – Write clean, maintainable code, implement CI/CD pipelines with GitHub Actions, deploy to Kubernetes, and ensure quality through testing and code reviews … environments• Software Engineering Fundamentals – Strong understanding of OOP concepts, design patterns, SOLID principles, algorithms, data structures, and ability to write clean, maintainable code• Backend Development – Proficiency in Python (Pandas, FastAPI, Flask) for building enterprise applications, data processing, and API development• Frontend Development – Experience with ReactJS, Node.js ...

lead projects, mentor junior developers, and work on high-impact, secure banking solutions. You will be a key contributor to web portal and API development, ensuring performance, security, and reliability in a dynamic environment. This role is ideal for developers with strong technical expertise who are looking … portals using ASP.NET MVC/.NET Core Design and integrate REST APIs with internal and third-party services Implement secure authentication mechanisms (JWT, OAuth2, API Keys) Connect applications to relational databases using Entity Framework Core (DbContext, LINQ, Migrations) Debug and trace request flows from UI Controller API Database ...

about building reusable backend capabilities that enable multiple teams and products. Strong understanding of distributed systems, event-driven architectures, and asynchronous messaging patterns. Designed API-first platforms with GraphQL and REST-based services. Comfortable working with high-volume transactional systems where reliability, performance, and resilience are critical. Core Competencies … driven architectures. Proficient in Java and Kotlin, with a solid understanding of distributed systems and high-volume transactional environments. Highest-signal resume keywords Java Development Kotlin Development Microservices Architecture GraphQL API Design Event-Driven Architecture ATS Optimization Keywords Hard Skills Backend Engineering API Development Distributed ...

Lead Developer/Team Lead – FintechTech: C# .net, Azure, SQL, Team City, GIT, TFSChallenge: Greenfield Trading platform, API development, industry specific challengesFirm: Well-known Insurtech software business, West London, 10 man flat Dev TeamPay: 65k, Bonus- 750 training budget, Pension, Life/Health, Some Flex WorkingQuant is urgently … looking for a Lead Developer/Development Manager to join our high profile client.Current challenges include cloud migration, greenfield trading platform development, and bank based API creation.Our client is a well known fintech software house in the City.Day to Day the Lead Developer/Development Managers ...

Lead Developer/Team Lead – FintechTech: C# .net, Azure, SQL, Team City, GIT, TFSChallenge: Greenfield Trading platform, API development, industry specific challengesFirm: Well-known Insurtech software business, West London, 10 man flat Dev TeamPay: 65k, Bonus- 750 training budget, Pension, Life/Health, Some Flex WorkingQuant is urgently … looking for a Lead Developer/Development Manager to join our high profile client.Current challenges include cloud migration, greenfield trading platform development, and bank based API creation.Our client is a well known fintech software house in the City.Day to Day the Lead Developer/Development Managers ...

Role Summary :We are seeking a Java API Developer to join our Digital Asset development team. This is a hands-on software engineering role responsible for designing, developing, testing, and supporting RESTful APIs and backend services in a financial services environment. The role contributes to building reliable, secure … maintain Java-based backend services and REST APIs that support financial services workflows and data use cases.Implement APIs in line with internal requirements for API design, security, versioning, and documentation, ensuring solutions are consistent and reusable.Collaborate with business and technology stakeholders to understand requirements, clarify edge cases, and deliver ...

engineering direction of products used by thousands of organisations across the UK and internationally. This is an opportunity to combine hands-on software development with technical leadership, working with modern Microsoft technologies, AI-assisted development tools, and cloud-native architectures. Your Team You’ll work within a collaborative … across both our engineering practices and products. You'll have the opportunity to leverage tools such as GitHub Copilot while contributing to the development of intelligent capabilities within our SaaS platform. Beyond delivering great software, you’ll help mentor others, contribute to technical decision‐making, and influence ...

reliable and performant backend systems Develop low-level control and dispatch systems for power management Provide platform functionality through the web application and public API Design, build and maintain backend services Contribute to technical leadership, mentorship and team best practices Balance long-term strategy with short-term needs … changing industry Participate in an on-call rotation and take end-to-end ownership of technical operations Requirements Experience with Go and cloud-native development, including AWS, microservices and CI/CD Strong problem-solving skills Ability to work autonomously in a collaborative environment Knowledge of database technologies Knowledge ...

mobile applications that support an evolving digital strategy. The Role As a Digital Application Developer, you'll be involved in the full software development lifecycle, working closely with product, design and engineering teams to deliver secure, scalable and user-focused digital solutions. You'll contribute to the development … Skills & Experience We're interested in speaking with candidates who have experience in some of the following areas: React, TypeScript and modern JavaScript development Mobile application development using iOS and/or Android technologies API development and systems integration Software design principles and application architecture ...

role in raising engineering quality, accelerating delivery through automation, and driving continuous improvement across the platform. Job Responsibilities: Executes software solutions including design, development, and technical troubleshooting, with the ability to think beyond routine or conventional approaches to build durable solutions and break down complex technical problems using Java … complex applications (e.g., service boundaries, data flows, interface contracts, resiliency patterns) and is accountable for ensuring design constraints are implemented and validated through software development Gathers, analyses, synthesizes, and develops visualizations and reporting from large, diverse datasets to drive continuous improvement in application performance, resiliency, and operational stability Proactively ...

experienced software engineer who enjoys taking ownership and solving challenging technical problems. You'll ideally have experience with: Full stack software development in commercial environments Angular or another modern TypeScript frontend framework Java backend development SQL databases and API development System integration and enterprise application development CI/CD pipelines, automated testing and DevOps practices Software architecture and scalable system design Agile delivery and collaborative development practices Just as importantly, you'll be someone who: Enjoys working through ambiguity and solving complex problems Communicates confidently with both technical and business stakeholders Takes pride ...

this role is to contribute to application systems analysis and programming activities, ensuring the delivery of high-quality and robust software solutions. Responsibilities: Application Development: Design, code, and debug Java applications. Contribute to the entire software development lifecycle, from conception and design to testing and deployment. Technical Contribution … Java, adjacent technologies, and software engineering principles to help solve problems and troubleshoot issues. AI Integration: Actively explore and utilize modern AI-powered development tools and technologies to enhance productivity and code quality. Experience with AI development assistants and agents is desirable. Collaboration & Communication: Clearly communicate technical concepts ...

DescriptionRole Summary :We are seeking an experienced Java API Developer to join our Digital Asset development team. This is a hands‐on engineering role responsible for building and operating secure, resilient API services that power institutional digital asset capabilities—spanning digital custody, tokenization enablement, digital transfer agency … services and REST APIs that support digital asset product flows (custody, tokenization, TA, digital cash/settlement) and integrate cleanly into the broader platform.Build API services that participate in the platform’s centralized integration approach—supporting client/app onboarding and app-to-service integrations via an Integration ...

Monday – FridayInterview Process: 3-stage processWhy SCC An inclusive workplaceExcellent package: solid basic and company benefitsHybrid working & core hours in line with role requirementsCareer development and life-long learning opportunitiesOpportunity to join Europe's largest privately-owned IT CompanyRole purpose: We are looking for an AI Engineer to design … existing business process or platform. What stays consistent across all of it is the approach: working with best-in-class foundation models via API, integrating cleanly with enterprise data and systems, and building things that work reliably in production — not just in a demo. You will work closely with ...

/SQL Server/REST APIs THE ROLE A growing, product-led software business is looking for a Software Engineer to join its Product Development team on a hybrid basis (two days a week on-site in Newark). This is a genuine blend of hands-on development … BENEFITS Salary of £35,000 - £40,000 Hybrid working - only two days a week on-site in Newark Full-lifecycle exposure across support, development and deployment Modern stack and up-to-date tooling, including AI-assisted development platforms International, product-led business with real scope to learn ...

lookout for 2 Senior AI Engineers to play a pivotal role in our AI and Generative AI initiatives, focusing on the design, development, and deployment or integration of advanced AI systems and solutions.We’re seeking Senior Engineers with deep technical expertise in AI technologies, particularly in areas such … Azure OpenAI, Cognitive Services, prompt engineering, Retrieval‐Augmented Generation (RAG) architectures, vector stores, and API integrations. You’ll be able to demonstrate substantial experience in Azure networking and infrastructure, enabling you to effectively design, and manage secure cloud‐based AI environments. This includes leveraging off‐the‐shelf agentic ...

Framework and .NET Core, proficient in developing and maintaining complex web applications, APIs, and client interfaces. You will be responsible for the full software development lifecycle, including design, development, testing, deployment, and maintenance. Job Description: - Develop and maintain EPM Client applications using .NET 4.8, Visual Studio … Database. - Design and implement EPM Web Page and API using .NET Core 7.0 and Blazor Server Pages. - Ensure the web applications and APIs are hosted and managed effectively using Rancher Kubernetes and Docker Clusters. - Perform database access and management for web pages via API clients and Entity Framework. ...

lookout for 2 Senior AI Engineers to play a pivotal role in our AI and Generative AI initiatives, focusing on the design, development, and deployment or integration of advanced AI systems and solutions. We’re seeking Senior Engineers with deep technical expertise in AI technologies, particularly in areas such … Azure OpenAI, Cognitive Services, prompt engineering, Retrieval‐Augmented Generation (RAG) architectures, vector stores, and API integrations. You’ll be able to demonstrate substantial experience in Azure networking and infrastructure, enabling you to effectively design, and manage secure cloud‐based AI environments. This includes leveraging off‐the‐shelf agentic ...

/CD pipelines, cloud infrastructure, and deployment automation across a hybrid cloud and on-premise ecosystem.This role combines DevOps engineering, cloud architecture, and software development, requiring strong experience in automation, scripting, and full-stack engineering support. The position supports critical delivery pipelines and helps scale engineering capabilities by consolidating … responsibility for CI/CD and DevOps operations, while also contributing to application development when needed.Key ResponsibilitiesDesign, build, and maintain CI/CD pipelines using GitLab CI/CD, Jenkins, and GitHub EnterpriseDevelop and manage Infrastructure as Code (IaC) using AWS-native tools and automation frameworksBuild and optimize cloud ...

Tech: C#, Multithreading, Grindgain, Linq, SQL, Winforms Challenge: Greenfield Trading platform, API development, industry specific challenges Firm: Well-known Fintech Trading Platform Vendor, City of London, 30 man flat global Dev Team Pay: 80k, Bonus- 750 training budget, Pension, Life/Health, Some Flex WorkingC# Software Engineer – MultithreadingQuant … business. They provide valuations and pricing of derivatives to most of the buy side.This is an opportunity for an individual with a strong software development background. The applicant will be responsible for design, development and maintenance of my clients main pricing analytical library in C#. Quants Developers Must ...

Junior Frontend Developer Angular Developer – FintechTech: Angular, C# .net, Azure, SQL, Team City, GIT, TFSChallenge: Greenfield Trading platform, API development, industry specific challengesFirm: Well-known Insurtech software business, London, 10 man flat Dev TeamUp to 45,000Quant is urgently looking for an Angular Developer to join our high … profile client.Current challenges include cloud migration, greenfield trading platform development, and bank based API creation.Our client is a well known fintech software house in central London.This is an expansionary role building a greenfield financial modelling platform used by major finance business’.Working together with our team leads, solution ...

developing, maintaining and modernising our Brightlime CRM platform and wider technical estate. This is a hands-on role focused on PHP, MySQL and robust API development, spanning both legacy systems and modern platform components. You will help build new features, maintain existing applications, design and support RESTful APIs … integrate third-party services and ensure reliable data exchange across our website, external partners and core business systems. Working closely with the Lead Development Architect and development team, you will analyse and improve legacy codebases, introduce automated testing, troubleshoot complex production issues and support the gradual modernisation ...

Implement Infrastructure as Code using Terraform. Establish and maintain CI/CD pipelines and GitHub Actions workflows. Embed security controls and governance into the development lifecycle. Help define engineering standards, reusable patterns and best practices. Coach internal teams and contribute to the organisation's growing AI capability. Essential Skills … Experience We're looking for candidates with strong experience in: Cloud & Platform Microsoft Azure Kubernetes Terraform GitHub Actions Development Python API Development REST APIs GraphQL AI & Automation Large Language Models (LLMs) GPT, Claude and/or Gemini AI Agents Retrieval-Augmented Generation (RAG) Vector Databases LLM orchestration ...

large scale enterprise applications within a global financial services organisation. This is an opportunity to work on modern software engineering projects where AI assisted development is actively encouraged. You'll use tools such as GitHub Copilot, Claude or similar technologies alongside modern engineering practices to help deliver high quality … code Participate in code reviews and Agile ceremonies Troubleshoot and resolve production issues Use AI tools such as GitHub Copilot or Claude to accelerate development Contribute to continuous improvement and engineering best practice What we're looking for Strong commercial Java development experience Spring Boot and REST API ...

large scale enterprise applications within a global financial services organisation. This is an opportunity to work on modern software engineering projects where AI assisted development is actively encouraged. You'll use tools such as GitHub Copilot, Claude or similar technologies alongside modern engineering practices to help deliver high quality … code Participate in code reviews and Agile ceremonies Troubleshoot and resolve production issues Use AI tools such as GitHub Copilot or Claude to accelerate development Contribute to continuous improvement and engineering best practice What we're looking for Strong commercial Java development experience Spring Boot and REST API ...