76 to 100 of 144 API Design Jobs in London

models and services, ensuring consistency across analytics use cases.Develop and integrate derived data pipelines and datasets used in research, backtesting, and production analytics.Contribute to API design, data modeling, and system architecture for shared analytics platforms.Integrate analytics services with batch and streaming data pipelines across research and trading workflows.Partner … investment requirements into robust platform capabilities.Contribute to system reliability through testing, monitoring, and operational best practices.Participate in code reviews and technical discussions to improve design, performance, and maintainability.What’s REQUIRED3–10 years of experience developing production-quality backend software in C#, with a strong focus on distributed systems ...

high-performing, inclusive team culture. This role emphasizes engineering excellence, operational readiness, and secure, compliant delivery in a fast-paced global environment.Job ResponsibilitiesLead the design and delivery of user interface capabilities across Execute, from discovery to production supportSet front-end technical direction, including architecture, standards, performance, and testing strategyPartner … technical leadership in setting standards, leading designs, and directly managing or mentoring small teams of mid-level engineersSolid software engineering fundamentals, including OO/design patterns, debugging, and documentationFamiliarity with agentic development approaches across the software development lifecycleStrong communication and people skills, with the ability to work effectively ...

What were looking for: Hands-on experience running real production workloads on AWS not just deploying to it Strong Postgres/SQL skills: schema design, query tuning, migrations Solid API design chops: clear contracts, versioning, backwards compatibility Python-first mindset (FastAPI or similar) Redis experience: caching patterns ...

sophisticated technology.Your role:As the Lead Technical Architect you will collaborate with Team Leads across the business to support them with technical architecture and design on large, complex, cloud based distributed systems, ensuring best practice and a cohesive structure. The tech stack is based on modern Java … understanding of agentic AI development tools and how to implement them and drive change within the businessYou have a strong knowledge of microservices architecture, API design, enterprise integration patterns, AWS cloud architectureYou have a good understanding of modern software development practices e.g. TDD, CI/CD, DevOps, SecOps ...

Experience with AWS or Azure Familiarity with Docker and Kubernetes Experience working in secure or highly regulated environments Strong understanding of software architecture and API design IT WOULD BE NICE FOR THE AI SOFTWARE ENGINEER TO HAVE. Experience with RAG pipelines and vector databases Knowledge of MLOps tooling ...

Experience with AWS or Azure Familiarity with Docker and Kubernetes Experience working in secure or highly regulated environments Strong understanding of software architecture and API design IT WOULD BE NICE FOR THE AI SOFTWARE ENGINEER TO HAVE.... • Experience with RAG pipelines and vector databases • Knowledge of MLOps tooling ...

high-signal workflows at scale. This role emphasizes engineering excellence, operational readiness, and secure, compliant delivery in a fast-paced global environment.Job ResponsibilitiesLead the design and delivery of user interface capabilities across Execute, from discovery to production supportSet front-end technical direction, including architecture, standards, performance, and testing strategyPartner … delivering real-time or data-intensive user experiencesDemonstrated technical leadership in setting standards, leading designs, and mentoring teamsSolid software engineering fundamentals, including OO/design patterns, debugging, and documentationFamiliarity with agentic development approaches across the software development lifecycleStrong communication skills and ability to work effectively in global, cross-functional ...

exhaustive list. They may change at the company’s discretion.Required Qualifications7+ years of experience building production-grade software systemsStrong software engineering fundamentals, including system design, data modeling, API design, and writing well-tested production code.Experience building and operating data-intensive software systems, not just declarative pipelines ...

architecture of key strategic initiatives across Fourth. Working as an embedded member of delivery teams, you will provide hands-on architectural leadership, helping engineers design, build and evolve scalable, maintainable and resilient software solutions.You will apply Fourth's application architecture standards, patterns and engineering principles, whilecontributing to their ongoing … practical delivery experience.· Produce architectural designs, decision records, and technical documentation that clearly communicate solution intent and support long-term maintainability.· Participate in architecture, design, and code reviews, providing constructive feedback and helping ensure consistency with established architectural principles.· Collaborate with business, product, engineering, and fellow architects to understand ...

Develop and maintain high-quality software applications using .NET (4.5+/.NET Core) and Python. Collaborate with cross-functional teams to gather requirements and design effective solutions. Provide support to team members and stakeholders to ensure smooth project execution. Liaise with technical and business colleagues to understand functional requirements … deliver solutions that align with business objectives. Utilise your understanding of Web Services (REST, SOAP) to design and document APIs effectively. Work with MS SQL Server, including TSQL, SSIS, SSRS for database management and reporting. Utilise version control tools such as Git/Bitbucket and job scheduling tools like ...

teams to 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 environmentsEnsure strong isolation, security … maintain a product roadmap for sandboxing, balancing immediate needs against long-term architectural investmentLead architecture reviews and own projects end-to-end, from design through deployment, in fast-paced cross-functional settingsIdeally you'd have:4+ years of experience building high-performance systems software, with meaningful time spent maintaining ...

early stage of the build and looking for Lead Software Engineers to partner closely with the VP of Engineering to design and deliver foundational capabilities. This is a hands-on role for someone who wants to help shape the architecture, standards, and engineering culture of a new platform while … leveraging modern coding practices to deliver high-quality code and infrastructure. How you will provide meaningful contributions: Design and build backend services for the platform, primarily in Go, running on AWS with Postgres as a core data store. Own features and services end-to-end: from shaping requirements ...

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 ...

with strategic leadership capabilities to deliver robust, scalable data solutions that support our organization's analytical and operational requirements.Responsibilities:Lead the end-to-end design, development, and maintenance of our enterprise-grade Data Lake platform, with particular emphasis on optimizing data ingestion workflows and acquisition methodologiesCollaborate closely across various … health and lineageEstablish and maintain documentation standards, best practices, and governance frameworks for data acquisition and quality assurance processesLead architectural discussions and to technical design decisionsSkills, experience, qualifications and knowledge required:Experience: Experienced Java Software Engineer with extensive professional development experience and a proven track record of delivering enterprise ...

contributing to architecture, delivery, and continuous improvement. This is a hands-on role with strong influence over engineering standards, quality, and technical direction.Key Responsibilities Design, develop, test, and maintain scalable services using C#/.NET (ASP.NET Core) and RESTful APIs.Build responsive, accessible user interfaces using React, TypeScript, HTML … OAuth2/OIDC) and follow secure coding practices.Optimise performance, reliability, and observability (logging, metrics, tracing).Work with relational databases (e.g., SQL Server) including schema design, queries, and tuning.Write automated tests (unit, integration, end-to-end) and participate in code reviews.Collaborate with product, design, and stakeholders to refine requirements ...

with delivery teams to guide implementation and resolve technical challenges. * Conduct architecture reviews for projects and change requests, validating alignment with EA standards. * Design end-to-end integration solutions across the firm's application estate (Aderant, iManage, Intapp, HubSpot). * Define API contracts, message schemas, and integration patterns … build vs buy decisions. * Conduct proof of concepts (POCs) and technical spikes to validate architectural approaches. Required Experience: * Experience in solution architecture, technical design, or senior development roles. * Strong experience designing integration solutions across enterprise applications. * Excellent knowledge of API design, messaging patterns, and integration architectures. * Experience ...

strong emphasis on defining the future product and platform experience, patterns, and contribution pathways that will enable federated scale over time.ML Engineers – Responsibilities & SkillsResponsibilities* Design and build MCP servers and tools that expose enterprise systems and workflows to AI agents.* Implement Skills that orchestrate tools, data, and reasoning into … repeatable, governed workflows.* Contribute to the LSEG AI Assist agentic harness, including planning, tool‐calling, and orchestration logic.* Build secure API wrappers where backend systems lack suitable authentication or entitlement models.* Work closely with product teams in a “build for” capacity, transferring knowledge and establishing reusable patterns.* Shape ...

quality by writing unit and UI tests and contributing to the health of our CI/CD pipelines.Collaborate cross-functionally with Backend Engineers on API design, Product Managers on roadmap priorities, and Designers on seamless user experiences.What makes you great for this positionStrong proficiency in Swift and deep … knowledge of the iOS framework (Objective-C knowledge is a plus).Solid understanding of RESTful API integration and experience working with backend engineers on API design.Experience working with agile methodologies, CI/CD pipelines, and pair programming.Deep care for user interaction, usability, and interface quality—you build things ...

Staff Product Manager, GTPN (Global Treasury & Payment Network), you will drive the strategy, roadmap, and execution for our customer-facing API platform, enabling global treasury and payment solutions at scale. You will work cross-functionally with engineering, sales, and leadership to deliver innovative, scalable, and secure API products … feedback, and validate product features.Translate complex use cases into scalable, secure, and intuitive APIs in collaboration with engineering teams.Lead cross-functional teams—including engineering, design, sales, compliance, and data science—to deliver impactful solutions.Use data-driven methods to define and measure success metrics, prioritize requirements, and communicate plans ...

running a business.Teya exists to change that.We’re building a financial platform for local businesses across Europe - one built around simple tools, thoughtful design and real human support. Our Members rely on us to help them run their business with confidence, and that responsibility shapes the way we work.We … friendly experience for merchants across Europe.Collaborate with cross-functional teams to align technical solutions with business objectives.Actively participate in critical project decisions, including architecture design, framework selection, and tool evaluation.Mentor and support team members, fostering a collaborative and growth-oriented environment.Continuously improve applications while applying automation best practices ...

with C# and .NET, capable of writing clean, well-tested, production-grade codeStrong experience designing and building microservices and distributed systemsSolid grounding in RESTful API design and Azure cloud developmentDeep familiarity with modern software development practices and scalable system architectureExperience working cross-functionally with Product, QA, and other ...

products (e.g., Concierge an agentic AI workflow tool, Prism a Mercer knowledge fabric for scheme data, and similar initiatives), from problem framing and design through build, release, and support.Translate risk advisory/consulting needs into clear technical requirements, user stories, and solution designs; partner with stakeholders through … coding work.Proven experience as a Tech Lead/Lead Engineer delivering production software, including hands-on coding and code review ownership.Strong backend engineering skills (API design, data modelling, performance) and experience building secure, role-based applications.Experience working directly with business stakeholders in a financial firm, with the ability ...

senior generalist who can move freely across backend and frontend as the roadmap demands. You will pick up any layer of a feature, from API design and database schema to the frontend that sits on top of it, and own it end-to-end.In this role, you will … Design, build, ship, and maintain features across the full stack for our roadmap surfaces: large-scale file upload and management, shared knowledge bases, the agent extensibility framework (skills and integrations), and the pipeline that syncs external enterprise data into the platform.Own features end-to-end, from technical design ...

Cloud and Order Management capabilities to support Heathrow’s retail and service operations. You will define technical standards, ensure best practices, and guide the design of integrated solutions that enhance customer experience and operational efficiency. Success in this role means delivering secure, scalable, and high-performing platforms that enable … Salesforce Architect with expertise in Commerce Cloud and Order Management.Strong understanding of Salesforce platform architecture, integration patterns, and security best practices.Hands-on experience with API design, data modelling, and system integrations.Excellent stakeholder management and communication skills.Ability to lead technical discussions and influence decision-making at senior levels. Desirable ...

building the most consequential AI solutions in Funds Transfer Pricing and Financial Hedging platforms, and we are looking for a Senior AI Engineer to design & develop Agentic AI solutions for these domains.The ideal candidate is visionary engineer, passionate about architecting and building sophisticated AI agents from concept to production.In … includes hands-on experience with planning/reasoning, memory systems, MCP and Vector DBsPractical knowledge of LLMs and their application within agentic architectures, including API design and integration for AI services.Demonstrated mastery of Prompt and Context Engineering, including the ability to structure and compress information for optimal model ...