26 to 50 of 251 API Design Jobs in London

work covers backend services for order management, market data processing, and trade lifecycle systems. The position requires professional experience building backend services, REST API design, SQL knowledge, and experience integrating internal or third-party services. Kotlin and Python are the preferred backend languages. The employer does not state … streams Work with product, frontend, and trading teams Contribute to architecture and technical decisions Technical Qualifications The qualification profile includes backend service development, REST API design, SQL, and internal or third-party service integration. Performance fundamentals, problem-solving, and communication skills are also required. WebSockets, event-driven systems ...

/Verse boundary Work closely with language consumers to ensure an exceptional user experience Establish test workflows to validate improvements and prevent regressions Design and maintain the scripting interface to Unreal Engine, working in close collaboration with the Verse Language team and the broader UE engineering organization What … looking for Expert knowledge of C++17 or later Experience in compiler or toolchain development (e.g., compiler internals, VM design, Clang/LLVM, or linker/platform ABI specifics) Experience developing and optimizing large codebases, with the ability to make tradeoffs between usability, performance, and power Strong ability to reason ...

real initiatives and develop hands-on expertise. You will collaborate with chief architects and engineers, translate requirements into technical specifications, and contribute to API design, data flows, and cloud deployment planning across AWS, Azure, and Google Cloud. #J-18808-Ljbffr ...

Director Data & Analytics API Experience - Data ServicesBackground: CME Group runs some of the world's largest and most important trading venues, including derivatives exchanges, FX/FI platforms. The trading participants include leading investment banks, hedge funds, proprietary trading firms, investment managers, and retail traders, as well as additional … stakeholders such as independent software vendors (ISVs) and data redistributors. To support our unique data and analytics products, we are now building a unified API-first distribution framework, simplifying consumption and value extraction. The Role: We are seeking a key stakeholder for the CMEG External Data-Analytics (DA) APIs ...

/B testing, directly impacting our business results. We collaborate closely with the analytics, product, and engineering teams. In this role, you will: Design, develop, and apply machine learning solutions to real-world personalization, product, and business problems, translating ambiguous opportunities into scalable models, experiments, and production-ready capabilities. … strong attention to measurable impact. Partner closely with engineers, product, and business stakeholders to integrate machine learning solutions into services and workflows, including system design, API design, and data modelling considerations where applicable. Use strong technical judgment to select appropriate methods, validate outcomes, and improve model performance ...

Background Director Data & Analytics API Experience - Data Services Background: CME Group runs some of the world’s largest and most important trading venues, including derivatives exchanges, FX/FI platforms. The trading participants include leading investment banks, hedge funds, proprietary trading firms, investment managers, and retail traders, as well … stakeholders such as independent software vendors (ISVs) and data redistributors. To support our unique data and analytics products, we are now building a unified API-first distribution framework, simplifying consumption and value extraction. The Role We are seeking a key stakeholder for the CMEG External Data-Analytics (DA) APIs ...

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 … will work closely with cross-functional teams to build robust, scalable, and secure digital asset products that meet our business and technical requirements.Role Description:Design, develop, and maintain Java backend services and REST APIs that support digital asset product flows (custody, tokenization, TA, digital cash/settlement) and integrate ...

work alongside architects, product stakeholders and delivery partners to ship software that brokers and analysts use every day.**Key Responsibilities:*** **Build Across the Stack:** Design, build and ship features end to end, from APIs and services through to responsive, accessible user interfaces.* **Cloud Native Delivery:** Develop and run cloud … usable, performant ways for brokers and analysts.* **AI-Enabled Development:** Build AI-enabled product features using patterns such as retrieval-augmented generation, tool and API integration, evaluation and human-in-the-loop design.* **AI-Assisted Engineering:** Use AI-assisted engineering tools such as Claude Code or Claude Cowork ...

Description Role 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 … work closely with cross-functional teams to build robust, scalable, and secure digital asset products that meet our business and technical requirements. Role Description: Design, develop, and maintain Java backend services and REST APIs that support digital asset product flows (custody, tokenization, TA, digital cash/settlement) and integrate ...

with Account Executives, Customer Success Managers, and Service Delivery to solve complex identity challenges for enterprise customers, leading efforts from the discovery and solution design through to evaluation for prospects and existing customers. You’ll translate technical and business requirements into scalable solutions, lead technical engagements, and ensure customers … Advise on best practices across identity, compliance, fraud, risk and integrations, adapting your approach to different customer contexts and levels of technical depth Strong API expertise (REST, API design, OAuth, API keys, JSON/XML) with the ability to translate complexity into clear, actionable solutions Comfortable ...

enterprise and partner ecosystems. The position also plays a key role in shaping industry best practices and representing the organisation externally. Enterprise & Ecosystem Architecture Design and oversee the implementation of enterprise-wide software architecture, spanning internal platforms, cloud environments, and external partner ecosystems Develop “big picture” architectural frameworks … adherence to security, compliance, regulatory, and quality standards Identify and mitigate long-term architectural risks (e.g., vendor lock-in, scalability constraints, regulatory exposure) Technical Design & Solution Development Conduct research, analyse data, gather requirements, and define end-to-end solutions Create architectural artefacts representing system functions, integrations, and user interfaces ...

that challenge and inspire you. Here's what a typical day might look like: Develop and maintain Symfony-based applications with clean, efficient code Design and implement RESTful APIs using API Platform or FOSRestBundle Build reusable bundles and Symfony components Integrate third-party services and APIs into applications … Optimize application performance and database queries Responsibilities Develop and maintain Symfony-based applications with clean, efficient code Design and implement RESTful APIs using API Platform or FOSRestBundle Build reusable bundles and Symfony components Integrate third-party services and APIs into applications Optimize application performance and database queries Write ...

based platforms, helping drive the transition to cloud-ready ASP.NET Core APIs, microservices, and Azure-native architectures.**Key Responsibilities****Technical Leadership*** Lead the design and development of applications using **C#, VB.NET**, ASP.NET Core, ASP.NET MVC, Web API, LINQ, and related .NET technologies.* Guide modernization of legacy **VB.NET … .NET Framework applications and services** into modern **C#, ASP.NET Core, and .NET 8+ API architectures** where appropriate.* Define and lead migration strategies for legacy **WCF/SOAP services**, including service decomposition, API design, security modernization, backward compatibility, and transition to RESTful and event-driven architectures.* Provide technical ...

drive high engineering velocity, this role offers an exceptional platform for technical leadership and impact.Key Responsibilities & Technical Leadership:Architectural Stewardship & Hands-On EngineeringArchitect, design, and deliver high-performance, resilient Java (21/25) and Spring Boot microservices powering core enterprise data ingestion, deduplication, and reconciliation engines.Lead the design … oversight across the full application stack, collaborating effectively with frontend engineers building modern React/TypeScript maintenance interfaces.Ensure seamless end-to-end integration, predictable API contracts, and consistent telemetry/monitoring across all tiers.Technical Profile & Qualifications:Required Technical Skills:7+ years of hands-on software engineering experience with deep ...

using Docker is desirable. Hands‐on experience or academic exposure to Python for data science or AI/ML development. Basic understanding of RESTful API design principles. Familiar with model development workflows, including training, evaluation and basic tuning. Exposure to tools such as Azure ML, Prompt Flow … vector search, embeddings, or retrieval techniques is desirable. Assists with basic ML pipeline configuration under guidance. Ability to write clear technical documentation and maintain API specifications using Open API 3.0+ Basic understanding of System Design and Architecture Basic understanding of microservices architecture and distributed system design. Familiarity ...

Architect and build end-to-end features across our React frontend and FastAPI backend, making sound technical decisions that balance speed with maintainability Design AI agent workflows using LangGraph for screening automation, RAG pipelines, and multi-agent orchestration Lead technical initiatives - own complex features from design to production … through code reviews, pairing, and technical guidance Shape engineering practices - contribute to architecture decisions, coding standards, and team processes Collaborate cross-functionally with Product, Design, Compliance, and other engineering teams to deliver impactful solutions Frontend: React, TypeScript, Material-UI Module Federation (Micro-frontend architecture) Vite, Vitest Python 3.13, FastAPI ...

Solirius Reply, part of the Reply Group, is a technology consultancy and digital transformation partner that helps organisations solve complex challenges through strategy, design, engineering, and delivery. We work closely with our clients to deliver secure, accessible, user-focused services that evolve with their needs. By combining deep technical … expertise with people-centred design, we create solutions that deliver meaningful, lasting impact. Our consultants partner directly with client teams, embedding into organisations to understand their goals, challenges, and users. This collaborative approach enables us to deliver tailored solutions that drive measurable outcomes across public and private sectors. Past ...

formats (part-time, full-time, or contract) in a fully remote environment, with a strong focus on AI-assisted software engineering. Key Responsibilities Backend & API Architecture: Design and build backend applications and REST APIs using PHP 8+ and SQL databases while refining existing production systems. Integrations & Automation: Manage … Level: Strong commercial experience in backend engineering with proven independence in making architectural decisions. Core Technical Stack: Advanced proficiency in PHP 8+, SQL, REST API design/maintenance, Git, Linux, and Docker. Software Practices: Deep understanding of existing codebases, modern development workflows, and hands‐on comfort with ...

will be a hands‐on technical leader who defines direction, raises engineering standards, and delivers measurable product outcomes, all while remaining deeply involved in design and development. This is not a traditional people‐management or delivery‐management role—here, you will write code, architect solutions, lead complex projects … role is perfect for leaders seeking high‐growth, product‐driven environments, who are passionate about distributed systems, and who want to directly influence the design of secure, scalable, and resilient infrastructure while cultivating top engineering talent. What You’ll Do: Architect and design scalable, resilient, high‐performance backend ...

Senior Backend Product Engineer to join our Capital Markets technology team in London. This is a hybrid, hands‐on role: you’ll design, build and run systems across Pre‐Trade, Trade and Post‐Trade, covering Structured Investments, Equity IPOs, Hedging & Monetization, ETFs, and more. … tests, with good judgment about what to test at each level Strong experience with Spring (Boot, Data, Security), relational database design, REST API design, and Kafka or a similar event streaming platform Experience working AI‐first: using AI agents to build software, with an understanding ...

every trading day, across low-latency services, large-scale data pipelines, distributed compute, and the APIs and interfaces on top of them. Key Responsibilities Design, build, and own the firm's risk calculation and exposure aggregation services, from position capture through to delivered risk numbers. Develop real-time … operating production systems, with deep expertise in Python and at least experience in one systems language Strong grounding in distributed systems, concurrency, service design, and API design; you have owned systems in production, not just written code for them. Solid engineering discipline: automated testing, code review ...

data grounding infrastructure using RAG (Retrieval‐Augmented Generation), vector databases, search indexes, and knowledge bases to supply agents with accurate enterprise context. Enterprise Integration & API Management: Develop and maintain custom APIs (REST, GraphQL, webhooks) and integration pipelines connecting AFO/Agentforce to Salesforce Data Cloud (Data 360), cloud warehouses … Deep experience with LLM orchestration, prompt tuning, and building RAG pipelines, vector search indexes, and knowledge base retrievers for enterprise data. Multi‐Agent Systems & API Mastery: Practical experience with API design (REST/SOAP/webhooks) and modern agent protocols (e.g., MCP, tool calling, or event‐driven ...

data grounding infrastructure using RAG (Retrieval-Augmented Generation) , vector databases, search indexes, and knowledge bases to supply agents with accurate enterprise context. Enterprise Integration & API Management: Develop and maintain custom APIs (REST, GraphQL, webhooks) and integration pipelines connecting AFO/Agentforce to Salesforce Data Cloud (Data 360), cloud warehouses … Deep experience with LLM orchestration, prompt tuning, and building RAG pipelines, vector search indexes, and knowledge base retrievers for enterprise data. Multi-Agent Systems & API Mastery: Practical experience with API design (REST/SOAP/webhooks) and modern agent protocols (e.g., MCP, tool calling, or event-driven ...

making the call when one is needed Build and maintain customer-facing features end-to-end across APIs, backend services, and data models Design and evolve database schemas and data models that support our client‐side app Develop scalable, secure APIs that power our product's application experiences Partner … Data to translate user needs and designs into technical solutions — contributing your own point of view, not just executing Speak up in planning, design, and code reviews — raise concerns early and challenge assumptions Identify and resolve production issues through effective debugging and root‐cause analysis Build and maintain monitoring ...

Enterprise Platform, you are the strategic technical advisor who helps enterprise customers understand the full potential of our Enterprise AI products (such as Model API) and design the right architectures to unlock that value. You combine deep knowledge of Generative AI with enterprise architecture expertise and effective communication … discovery through successful deployment, ongoing adoption, and expansion. This role combines pre-sales technical leadership with post-sales customer adoption and expansion. You will design scalable architectures, develop evaluation frameworks, create reference implementations, and serve as the technical authority that gives customers and internal stakeholders the confidence to purchase ...