251 to 275 of 448 API Design Jobs

Pre-Sales Technical Architect for SaaS Integrations

Location
Greater London, England, United Kingdom
client data will be sourced, validated, and integrated into Mondra, leveraging where possible our existing Import and Export APIs and identifying where custom API development may be required for fulfil Mondra’s data requirements. You will also contribute to the client contracting process, ensuring technical commitments are clearly defined … including mapping data sources, transformation logic, and validation processes. Identify the client’s BI requirements, and define data export strategies (preferably via existing Mondra API). Identify the authentication/authorisation capabilities of the client, and promote the integration with Mondra’s Identity Provider via Single Sign On. Leverage ...

Full Stack Developer

Location
United Kingdom
product development and ongoing application support. This is a hands-on role with real influence over how our products evolve. What you'll do Design, build, and maintain applications using Python and Django Work across the full stack, including front-end components (React, JS, CSS) Translate business and user … with stakeholders across the business and occasionally with clients Contribute to CI/CD pipelines using Azure DevOps The essential experience Python 5+ years API Integrations Strong SQL skills (MySQL or PostgreSQL) Solid front-end fundamentals (HTML, CSS, JavaScript, React, Angular) Good understanding of software design principles ...

Technical Lead

Hiring Organisation
Hackajob Ltd
Location
South West London, London, United Kingdom
Employment Type
Permanent, Work From Home
technical leadership across the Front Office application portfolio, ensuring solutions are aligned with business strategy, architectural standards, and operational requirements Lead the design, development, implementation, and support of technology solutions that enable investment, trading, portfolio management, and related business capabilities Partner with Product Owners, business stakeholders, architects, and engineering … platform simplification, application resiliency, automation, and AI-enabled capabilities Act as the primary technical authority for the application suite, making informed decisions on architecture, design patterns, technology selection, and engineering best practices Manage technical deliveries across multiple concurrent initiatives, ensuring successful execution, risk management, stakeholder communication, and high-quality ...

Technical Lead (Front Office Asset Management Tech Stack)

Location
Greater London, England, United Kingdom
technical leadership across the Front Office application portfolio, ensuring solutions are aligned with business strategy, architectural standards, and operational requirements Lead the design, development, implementation, and support of technology solutions that enable investment, trading, portfolio management, and related business capabilities Partner with Product Owners, business stakeholders, architects, and engineering … platform simplification, application resiliency, automation, and AI-enabled capabilities Act as the primary technical authority for the application suite, making informed decisions on architecture, design patterns, technology selection, and engineering best practices Manage technical deliveries across multiple concurrent initiatives, ensuring successful execution, risk management, stakeholder communication, and high-quality ...

Senior Software Engineer

Location
Cambridge, England, United Kingdom
company offers highly competitive remuneration, an excellent benefits package and work-life balance including hybrid work. The core requirements: A senior software engineer’s design and coding ability and track record, judgement, mentoring and review skills. Strong commercial-grade C# software development with awareness of modern .NET … language, and establish good patterns and factoring. Microservice development experience – with good service factoring to reduce bloat, increase independence and separate concerns – and RESTful API design and development. Strong communication skills to liaise with colleagues in other product teams. A good technical degree from a top university, backed ...

Senior Software Engineer

Hiring Organisation
ECM Selection (Holdings) Limited
Location
Cambridge, Cambridgeshire, United Kingdom
Employment Type
Permanent
company offers highly competitive remuneration, an excellent benefits package and work-life balance including hybrid work. The core requirements: • A senior software engineer’s design and coding ability and track record, judgement, mentoring and review skills. • Strong commercial-grade C# software development with awareness of modern .NET … language, and establish good patterns and factoring. • Microservice development experience – with good service factoring to reduce bloat, increase independence and separate concerns – and RESTful API design and development. • Strong communication skills to liaise with colleagues in other product teams. • A good technical degree from a top university, backed ...

Lead Engineer, Risk Technology

Location
Greater London, England, United Kingdom
clean, maintainable, performant applications; promote best practices, and collaborate closely with our quantitative and product teams.**What You’ll Do*** High-Performance JVM Engineering: Design and build high-quality, scalable and performant low/zero-GC JVM services and APIs* Technical Translation & Risk Modeling: Understand risk models & decompose complex … experience in architecting highly performant, low-latency systems.* Testing Methodologies: In-depth knowledge of testing methodologies, including TDD, back testing and stress testing* Software Design Excellence: Well versed in Agile methodologies, DRY, Clean Code, API design and micro-services.* Technical Ecosystem: Experience in a full range ...

Senior .NET Developer

Hiring Organisation
Pontoon
Location
Bromley, London, United Kingdom
Employment Type
Contract
Contract Rate
£700 - £750/day Inside IR35
development role. You will be expected to have years of experience of commercial development experience utilising: TECHNICAL SKILLS: Deep functional knowledge or hands on design experience with Web Services (REST, SOAP, etc) Understanding of API design and documentation .NET 8.0/10 (C#) .Net CORE (C#) .NET … Framework 4.7+ Angular (v2+), JavaScript Net MVC 5.0 & Web Api 2 ORM (EntityFramework/nhibernate/Dapper) MS SQL Server 2008+, DB2 Dependency injection and frameworks, e.g. Unity Practical experience with TDD and CI/CD OTHER SKILLS: An aptitude for problem analysis and resolution and eye for details. ...

Senior .NET Developer

Hiring Organisation
Pontoon
Location
Bromley, Kent, United Kingdom
Employment Type
Full-Time
Salary
£700.00 - £750.00 per day
development role. You will be expected to have years of experience of commercial development experience utilising: TECHNICAL SKILLS: Deep functional knowledge or hands on design experience with Web Services (REST, SOAP, etc) Understanding of API design and documentation .NET 8.0/10 (C#) .Net CORE (C#) .NET … Framework 4.7+ Angular (v2+), JavaScript Net MVC 5.0 & Web Api 2 ORM (EntityFramework/nhibernate/Dapper) MS SQL Server 2008+, DB2 Dependency injection and frameworks, e.g. Unity Practical experience with TDD and CI/CD OTHER SKILLS: An aptitude for problem analysis and resolution and eye for details. ...

Software Development Engineer III

Location
Greater London, England, United Kingdom
technical leadership by designing shared GenAI capabilities, supporting live systems and raising engineering and AI delivery standards across the team through mentoring and rigorous design practice. Data & AI Product Development: Take ideas from discovery through rapid prototypes to production grade solutions that combine data, user facing applications and backend … services. Work closely with product managers, designers, data science and engineering teams to translate business needs into well designed technical solutions. Design and deliver LLM based applications and AI agents that enable intelligent decision making and automation, applying pragmatic engineering patterns and appropriate guardrails. Design and consume APIs ...

Software Developer - AIO (Typescript)

Location
United Kingdom
build the next generation of AI e-commerce platforms. What you will be responsible for Driving technical decision-making, including technology selection, architecture design, and system scalability Designing and implementing high-quality features across the backend and frontend stack Identifying and addressing performance bottlenecks in critical areas … professional software development experience, with strong expertise in TypeScript Proven experience building and maintaining production-grade web applications Strong backend engineering experience, including API design, system architecture, and distributed systems concepts Solid understanding of relational databases and advanced SQL Strong focus on software quality, testing, security, and maintainability ...

Agent Platform Engineer: AI-Driven Automation & API Design

Location
Greater London, England, United Kingdom
Elliptic is seeking a senior software engineer to design and build agent fleets, develop APIs, and optimize data models across relational and NoSQL databases. You will collaborate across engineering, product, and design to deliver a scalable platform from concept to production, contributing to observability and reliability for crypto ...

Systems Integration Engineer

Location
Greater London, England, United Kingdom
Connect enterprise platforms, APIs, and data pipelines into resilient end-to-end business workflows. You will design and implement integrations between critical systems, with focus on reliability, observability, and long-term maintainability in complex client environments. 02 - RESPONSIBILITIES What You Will Own Core Responsibilities. Design integration architecture … API, event, and batch workflows. Implement secure data exchange between ERP, CRM, and line-of-business tools. Build error handling, retry strategies, and operational alerting. Document interface contracts and transformation logic clearly. Support testing, cutover planning, and go-live execution. Collaborate with client teams on dependency mapping and sequencing. ...

Senior Software Engineer job at Rockstar Games, UK

Location
Leeds, England, United Kingdom
distributed video recording systems and advanced reporting/analytics applications. In this role, you will be deeply involved in hands‐on development, architectural design, and cross‐studio collaboration to advance our internal ecosystem. Key Responsibilities Design & Implementation: Architect and develop robust backend solutions to meet the fast‐paced … challenges of global game development. Technical Leadership: Contribute to the team’s software design guidelines, coding standards, and architectural blueprints. Global Collaboration: Partner and collaborate with other Rockstar technology teams across our worldwide studios. Continuous Innovation: Develop a deep understanding of existing systems while researching and adopting new technologies ...

Lead Software Engineer

Hiring Organisation
Intec Select Ltd
Location
London, Billingsgate, United Kingdom
Employment Type
Permanent
Tech Lead, Senior Software Engineer or Software Architect who enjoys solving complex technical problems and building modern, scalable software. Role & Responsibilities Lead the technical design and evolution of a large-scale business-critical platform. Improve the existing architecture and define a pragmatic roadmap towards a modern, scalable solution. Design … powered capabilities into the product to improve functionality and user experience. Drive the adoption of AI-assisted software development tools and engineering best practices. Design integrations with enterprise platforms, APIs and wider business systems. Work closely with Product, Architecture and Engineering teams to deliver incremental improvements. Mentor developers ...

Full Stack Developer – Manchester, UK – Full Time – Manchester

Location
Manchester, England, United Kingdom
Significant experience building and running production systems on AWS (or major public cloud). Architecture: Deep understanding of Microservices and event-driven architectures, including API design and contract management. Engineering Best Practices: Strong grounding in testing (Unit/Integration/E2E), CI/CD, and Observability. Communication: Excellent ...

Software Engineer - Workflow Authoring & Deployment

Location
Greater London, England, United Kingdom
based workflow validation before changes hit production What We’re Looking For Strong backend engineering skills in Python, Go, or similar Solid understanding of API design, data modelling, and the tradeoffs in distributed systems (consistency, concurrency, fault tolerance) Experience with cloud infrastructure and deployment: containerisation, CI/ ...

AI Platform Engineer

Hiring Organisation
Addition
Location
London, South East England, United Kingdom
Employment Type
Full-Time
Salary
£475.00 per day
production-quality code. Key Responsibilities You’ll play an important role in designing, building and delivering the AI platform by: Building and evolving the API gateway and routing layer connecting teams to multiple LLM providers. Developing failover, load-shedding and resilience capabilities for periods of provider degradation. Designing orchestration … registration and discovery tooling for reusable AI capabilities. Establishing API design, versioning and promotion workflows to move capabilities from experimentation into production. Implementing RBAC and OIDC-based access controls. Supporting secure API key issuance, rotation and revocation. Applying high standards across testing, observability and technical documentation. Using ...

Mid-Level Data Engineer (Python/ AWS)

Location
Belfast, Northern Ireland, United Kingdom
cloud-based data platform. This is a hands-on role focused on designing, building, and improving data pipelines and services, while also contributing to API design and occasional frontend work where needed. You’ll work across the stack, primarily in Python and AWS, helping to deliver reliable, well … data through APIs, and supporting a platform that removes bottlenecks and enables better use of data across the organisation. What You’ll Be Doing Design, build, and maintain ETL/ELT pipelines in production environments Develop ingestion and egress patterns to support reliable data access and integration Work with ...

AI Infrastructure Engineer, Sandbox Platform London, UK Apply →

Location
Greater London, England, United Kingdom
understand how they use the platform, debug their issues, and shape a roadmap that balances immediate needs with long-term architecture. You will: Design and build the sandboxing platform, client library, and API surface for secure code execution across containerized and virtualized environments Ensure strong isolation, security … maintain a product roadmap for sandboxing, balancing immediate needs against long-term architectural investment Lead architecture reviews and own projects end-to-end, from design through deployment, in fast-paced cross-functional settings Ideally you'd have: 4+ years of experience building high-performance systems software, with meaningful time ...

Senior Software Engineer (C# / .Net) · London ·

Location
Greater London, England, United Kingdom
putting carrier partners first, we are paving the way for better delivery experiences. LineTen is a new approach to delivery with a free carrier API and an operations management platform for shippers. We're building the first global data-driven last-mile network that has the potential to solve … encouraged, and outcomes matter more than activity. This is not a ticket-factory role: you'll be expected to think critically, challenge assumptions, design robust solutions, and take responsibility for their long-term success. You’ll work across backend services, distributed systems and frontend integrations, with a strong focus ...

Sr. Software Development Engineer ()

Hiring Organisation
Placement Services USA, Inc
Location
Boca Raton, Florida, United States
Employment Type
Any
Salary
USD Annual
Sr. Software Development Engineer (Ref. 338) to perform the following duties: Analyze users' needs and then design and develop software and applications to meet those needs; Translate user stories and functional requirements into resilient & secure technical designs; Ensure application SLAs are met by employing appropriate monitoring and alerting tools … required by each supported application; Work with development leads to assist in developing overall application technology design activities; Identify and define key architectures, components and interfaces, design of data model and data/information flows; Ensure that IT programs and software continue to function normally through software maintenance ...

FULL STACK DEVELOPER

Location
Liverpool, England, United Kingdom
industries, including telecommunications, utilities, and mechanical and electrical engineering. Established with a commitment to quality and innovation, MJ Quinn provides tailored solutions that integrate design, installation, maintenance, and project management. The company partners with leading organisations to execute complex projects, leveraging cutting-edge technology and a skilled workforce … while also contributing to a strong team culture and delivering outcomes that positively represent the organisation both internally and externally. KEY ROLES AND RESPONSIBILITIES Design and code clean, efficient and testable web-based applications and services. Take ownership of projects from project kick-off through to deployment and maintenance. ...

Senior Software Engineer

Location
Sheet, England, United Kingdom
cutting edge of agentic AI, designing agents that reason, take action, and handle complex, multi‐step interactions. What You’ll Be Doing: Design, build, and iterate on customer‐facing AI agents using Python and Node.js, including orchestration, tool use, memory, and conversation logic. Contribute to backend services using NestJS … scale. Help develop our omnichannel platform that enables seamless conversations across multiple communication channels (web, messaging, voice, and beyond). Collaborate closely with product, design, and data teams to shape what agents do and how they work. Define technical patterns and best practices as we scale our agentic systems ...

Senior Software Engineer – Data Visualisation & Graphics | London

Location
Slough, England, United Kingdom
working on the underlying systems that make complex visualisations fast, accurate, and scalable. The challenges range from rendering performance and interaction design through to algorithms, graphics, API design, and numerical correctness. What you’ll be doing Designing and building core charting features used by developers around … exceptionally high technical standards High levels of ownership and autonomy Small team, significant impact Opportunity to deepen expertise in performance, graphics, visualisation, and systems design Package Salary up to £200,000 Hybrid working (London) Private healthcare Pension Additional benefits If you’re interested in building the technology behind modern ...