76 to 100 of 103 API Design Jobs in London

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 … 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 ...

Chicago). The role offers the opportunity to contribute to business-critical systems while working in a collaborative and supportive environment. Key Responsibilities Design, develop, enhance, and maintain enterprise applications using C# and .NET technologies. Support and improve existing business-critical systems, ensuring stability, performance, and scalability. Work closely … with business users, analysts, and technical teams to gather requirements and deliver solutions. Participate in the full software development lifecycle, including design, development, testing, deployment, and support. Collaborate with globally distributed development teams across multiple locations and time zones. Contribute to technical discussions, solution design, code reviews ...

data across its entire lifecycle. While upstream teams build the specific trading workflows, our systems catch every single trade the millisecond it executes. We design, build, and scale the critical infrastructure responsible for real-time trade capture, robust distributed storage, and high-volume event distribution in a highly concurrent … scaling high-volume, high‐availability distributed systems Good working knowledge of relational databases and messaging queues (preferably PostgreSQL and Apache Kafka) Experience with API design, contract‐driven testing, and decoupled architectures A mindset focused on observability, capacity planning, and system resilience If indicated, please note that years ...

development lifecycle. You'll help establish a robust security culture as we unlock Granola for the next 100x users. In this role, you will: Design and implement security features within the Granola app to protect user data and strengthen the product's security posture Leverage AI-assisted tooling … security posture Your background looks something like: Extensive experience building production software, with hands-on exposure to security-sensitive work (auth, data handling, API design, encryption or similar) and a genuine interest in going deeper into application security Comfortable with secure coding practices and at least ...

high-volume, high-leverage platform role: the systems you build are used by many teams across the company, so correctness, reliability, and thoughtful API design matter enormously. Qualifications What do you need? 5+ years of experience in Java, Kotlin, Python or Go Strong experience with Spring framework, relational ...

requires clear ownership of data, well-defined integration patterns, and controlled transitions between systems. The Senior Data & Integration Architect provides the architectural leadership to design these flows, define boundaries, and ensure that the service can operate reliably throughout this evolution. Role Purpose The Senior Data & Integration Architect is responsible … transition and enables the organization to move with control and confidence. Key Responsibilities Define the target data and integration architecture for the service landscape Design transition patterns that allow two environments to operate together Establish data ownership models, system boundaries, and integration contracts Support wave and delivery planning with ...

heavily backend-biased position but given the size of the team you will be working across the stack when needed Build scalable, performant systems Design and deliver end-to-end features with direct impact on customer value Work with product and ML teams to help translate abstract and complex … software function About you: Strong ability across scalable and performant systems You have a product mindset Statically typed language expertise Experience with API design Low ego and love of engineering Full details are available. Please don't hesitate to get in touch for more information. ...

Central London (Hybrid, 3 days in-office) Engagement: Contract with potential to convert to permanent Rate: Competitive The Role: You will join a critical API team responsible for high-throughput backend services and real-time payment routing decisions. This is foundational infrastructure where your work directly affects payment acceptance … complex services in production. Production-level expertise in Go and/or Java. Experience building or maintaining high-volume, low-latency distributed systems. Strong API design skills. Hands-on experience with AWS cloud-native deployment. A systems-thinking approach to performance, correctness, and failure modes under load. Background ...

Central London (Hybrid, 3 days in-office) Engagement: Contract with potential to convert to permanent Rate: Competitive The Role: You will join a critical API team responsible for high-throughput backend services and real-time payment routing decisions. This is foundational infrastructure where your work directly affects payment acceptance … complex services in production. Production-level expertise in Go and/or Java. Experience building or maintaining high-volume, low-latency distributed systems. Strong API design skills. Hands-on experience with AWS cloud-native deployment. A systems-thinking approach to performance, correctness, and failure modes under load. Background ...

Required Active UK SC Clearance (Mandatory — applications without this cannot be considered) Core Engineering: Strong backend development skills (Python, Go, or C++) with solid API design and data pipeline experience AI Tooling: Hands‐on experience integrating LLMs, handling vector databases, and building robust chunking/embedding strategies Secure ...

problems end to end. You will bring strong JavaScript/TypeScript experience across frontend and backend development, alongside a clear understanding of API design and relational databases. You have mentored engineers and may already have line management experience, conducting development and performance conversations with maturity and clarity. ...

MVVM, or VIPER (we use VIPER and MVVM but are open to exploring new approaches). Desire to write testable code. Understanding of REST API design. Strong product mindset and passion for user experience, prioritising work that addresses user needs and making data‐driven decisions. Excellent communication skills, able ...

Google Software Engineer III, Full Stack, Publisher Inventory in London, UK, is seeking a mid-level engineer to design and implement scalable monetization interfaces. You will work on ad configuration tools and AI-powered features across the stack, collaborating with PMs and UX teams. Experience with Kotlin, C++, TypeScript … Dart or Angular is expected, along with strong API design and cross-platform development skills. #J-18808-Ljbffr ...

SHEIN. You’ll own multi-tenant infrastructure and architect scalable solutions to meet enterprise-grade requirements. Work with cross-functional teams across product, design, compliance and sales in a hybrid London model, shaping API design, security, performance, and business outcomes for a payments platform at scale. #J ...

Associates is seeking an AI Integration Engineer with active UK SC clearance for a contract position in London. The role focuses on backend development, API design, and data pipelines, with hands-on work integrating LLMs and vector databases in secure, classified environments. You will work on self-hosted ...

programming experience.* Technology/programming skills in Rust, C++, Java, KDB, Python, SQL* Extensive experience in messaging and data serialization technologies, market data processing, API design, latency optimization, code testing, build and deployment tools* Experience in taking ownership of existing technologies, building new ones, and performing technology migrations. ...

responsible for writing production-grade code and guiding engineers through mentorship. You should have a strong background in JavaScript and TypeScript, comfortable with API designs and relational databases. This hybrid position demands both technical and managerial skills, emphasizing the development of a healthy engineering culture. #J-18808-Ljbffr ...

observability and reliability. Raise engineering excellence and resilience through best practices and automation across code, testing, microservices/APIs, performance and infrastructure; secure‐by‐design with threat modeling, logging/monitoring, incident playbooks, and disaster recovery. Partner with product, design and operations to translate outcomes into measurable technical … building distributed systems and microservices in agile environments (Scrum/Kanban). Deep Java experience (Spring), architectural patterns for scalable, observable, testable systems; strong API design. Strong DevOps practices: CI/CD (e.g., GitLab), automated testing (JUnit/Spock), code reviews, telemetry/observability (Splunk, AppDynamics), containers (Docker ...

global technology company in London seeking a Lead Staff Software Engineer to own backend systems for a high-traffic data platform. You will design, build, and operate core services, mentor engineers, and collaborate across teams to drive technical direction in a fast-paced environment. You will lead a growing … engineering effort, run 1:1s, and participate in hiring to grow the London team. Strong experience with C#/.NET, SQL, and API design is highly valued. #J-18808-Ljbffr ...

teams, mentor senior engineers, and drive step-change impact across business-critical, scientific, and R&D domains. Key Responsibilities Provide technical leadership in the design and architecture of large-scale, production-grade ML systems and platforms across the organisation. Own end-to-end delivery of complex ML solutions from … scientific problem framing and algorithm design through to deployment, operationalisation, and product delivery. Apply advanced machine learning science to develop novel algorithms and models, ensuring they are rigorously validated and deployed as scalable, reliable, production-grade products. Bridge the gap between scientific research and enterprise deployment taking ML innovations ...

structured, actionable work that delivers measurable outcomes. You'll work across the full analysis lifecycle—from stakeholder engagement and discovery through to requirements, process design, delivery support and benefits realisation. The role suits someone who pairs strong analytical and requirements discipline with the facilitation skill to align stakeholders … operations colleagues to embed new ways of working (Technical/Systems BA) Bridge between business stakeholders and engineering—data flows, integrations, system behaviour, API design from a functional perspective (For Senior/Lead/Head of) Set BA standards and practice, mentor analysts, lead larger transformation and change ...

infrastructure in a hybrid work environment. The ideal candidate will have a strong background in distributed systems, particularly with Rust, and possess skills in API design and implementation. Join Neara to help shape new solutions in the financial sector, ensuring reliability and compliance while working with innovative technologies. ...

cases. You will also be accountable for the end‐to‐end engineering of GenAI and ML platforms, embedding governance, observability and operational resilience by design, hile enabling teams to deploy and run AI solutions with clarity, assurance and accountability at scale. To be successful as an AI Ops Platform … services such as Amazon Bedrock for foundation models, agent orchestration patterns, Lambda and Step Functions, alongside demonstrated Python engineering capability and secure microservices and API design. AI governance, observability and cost optimisation, embedding governance by design through policy as code, alignment to model risk framework expectations, lifecycle traceability ...

performance. System Architecture: Convert complex functional and non-functional requirements into elegant, high-performance, and resilient system designs across AWS infrastructure. Build the Foundation: Design and develop reusable libraries, APIs, and real-time Kafka data pipelines to be leveraged by engineering teams across the entire bank. Stakeholder Partnership: Engage … strategies from scratch. Excellent communicator and building teams. Modern Practices: A strong advocate for Test-Driven Development (TDD) , automated test frameworks, mocking, stubbing, and API design. Adaptability: The ability to rapidly translate complex business requirements into technical solutions, and a proven track record of supporting and maintaining code written ...

growing need to track new threats, develop new defences and deploy in a timely and efficient manner. How you can make an impact Design and execute Red Team Operations against iProov’s biometric platform, web apps, APIs, identity flows Strengthen the company’s security posture through offensive security assessments … reduction. Bring insight into all aspects of modern security issues to our products and rapidly developing prototypes for mitigations. Mentor engineers in secure‐by‐design patterns, client‐side security, and secure API design. Work hand‐in‐hand with developers to propose pragmatic mitigations, remediation plans, and detection logic ...