176 to 200 of 288 GraphQL Jobs in London

Senior Data Architect

Location
Greater London, England, United Kingdom
data domain: securities reference data, corporate actions, market data, and regulatory classifications, fixed income would be highly desirable Understanding of API design principles (REST, GraphQL) and schema evolution strategies for backward compatibility is essential. Direct experience of making data commercially available to AI agents is desirable. Fluent in English (both ...

Generative AI Director

Location
Greater London, England, United Kingdom
pipelines using DAG frameworks, including custom operator development and pipeline optimization. Architect and implement high‐throughput, low‐latency microservices with gRPC, REST, and GraphQL, including protocol buffer schema design, streaming endpoints, and load balancing. Apply hands‐on experience with parameter‐efficient fine‐tuning (LoRA, QLoRA, IA3), model quantization (INT8, FP16 ...

Applied AI ML Lead - DocAI

Location
Greater London, England, United Kingdom
Experience of big data technologies (e.g. Spark, Hadoop) Have constructed batch and streaming microservices exposed as REST/gRPC endpoints Familiarity with GraphQL We recognize that our people are our strength and the diverse talents they bring to our global workforce are directly linked to our success. ...

Senior Web Engineer (contract)

Hiring Organisation
PaymentSense
Location
London, United Kingdom
Salary
£ 80 K
libraries (such as Vanilla Extract or Emotion).A solid grasp of CI/CD processes, version control with Git, and how backend APIs like GraphQL integrate with frontend systems.A passion for product quality and creating exceptional user experiences, backed by strong communication and cross-functional collaboration skills.Experience contributing ...

Generative AI Director

Hiring Organisation
JP Morgan Chase
Location
London, United Kingdom
Salary
£ 120 K
production ML pipelines using DAG frameworks, including custom operator development and pipeline optimization.Architect and implement high-throughput, low-latency microservices with gRPC, REST, and GraphQL, including protocol buffer schema design, streaming endpoints, and load balancing.Apply hands-on experience with parameter-efficient fine-tuning (LoRA, QLoRA, IA3), model quantization (INT8, FP16 ...

Backend/API Engineer, Money as a Service

Location
Greater London, England, United Kingdom
internal and external users Preferred Qualifications Experience with large-scale financial tracking systems Good understanding and practical knowledge in cloud based services (e.g. gRPC, GraphQL, Docker/Kubernetes, cloud services such as AWS, etc.) Office-assigned Stripes in most of our locations are currently expected to spend at least ...

Engineering Director

Location
Greater London, England, United Kingdom
tools to prototype an idea or unblock your team, and you can govern an ecosystem built on React, React Native, TypeScript, Go microservices, GraphQL, Kubernetes, and GCP. You are comfortable managing a site distant from headquarters across various time zones. You leverage asynchronous communication, operating with high agency, independence ...

Principal Solutions Consultant

Location
Greater London, England, United Kingdom
broader customer data and identity stack. Strong grasp of client‐side integration nuances: mobile and web SDKs, push notification frameworks, webhooks, and REST or GraphQL APIs, including how they hold up under enterprise scale and multi‐region deployments. German language proficiency. Not required, but useful for DACH market conversations. Experience ...

Full Stack Engineer

Hiring Organisation
Harnham - Data & Analytics Recruitment
Location
London, South East England, United Kingdom
Employment Type
Full-Time
Salary
£65,000 - £85,000 per annum
Full Stack Engineer Up to £85,000 London (2 days a week in office) This is an exciting opportunity to join a fast-growing technology business that is transforming how people engage with and manage ...

Engineer C# (Full Stack)

Hiring Organisation
Liquidnet
Location
London, United Kingdom
Salary
£ 80 K
Group OverviewThe TP ICAP Group is a world leading provider of market infrastructure.Our purpose is to provide clients with access to global financial and commodities markets, improving price discovery, liquidity, and distribution of data, through ...

Lead Software Engineer - Data

Hiring Organisation
LinuxRecruit
Location
London, United Kingdom
Salary
£ 100 K
role where you would choose what you need to use to enhance the platform's performance, a rough tech stack is in play. GraphQl or Neo4j experience is highly desirable, programming with Python or TypeScript is again advantageous. You know the full SDLC and are comfortable architecting solutions. This role ...

frontend js/react/typescript for construction projects

Location
Greater London, England, United Kingdom
rota during working hours. Требования 5+ Years of professional frontend engineering experience; Strong experience with modern JavaScript/TypeScript and React; Experience working with GraphQL and REST APIs; Experience writing unit tests; Ability to leverage AI coding tools for rapid iteration; Security awareness and comfort operating across the full frontend ...

Senior Data Architect

Hiring Organisation
SIX Group
Location
London, United Kingdom
Salary
£ 80 K
data domain: securities reference data, corporate actions, market data, and regulatory classifications, fixed income would be highly desirable• Understanding of API design principles (REST, GraphQL) and schema evolution strategies for backward compatibility is essential. Direct experience of making data commercially available to AI agents is desirable.• Fluent in English (both ...

Staff Software Engineer (Web & Mobile)

Hiring Organisation
Appcast
Location
London, UK
/or Android, with strong fluency in Swift and/or Kotlin and the surrounding ecosystem - offline sync, push, auth, persistence, networking, REST/GraphQL) - and credible breadth beyond itDemonstrated breadth: you've worked seriously in at least one of {web frontend, backend services, data/infra, platform tooling} alongside ...

Senior Frontend Engineer

Location
Greater London, England, United Kingdom
scalable, performant sites that handle high levels of traffic well Desirable: energy domain knowledge Our stack React (required) TypeScript (required) Next.js on Vercel (desirable) GraphQL w/Tanstack Query (desirable) React Testing Library & vitest and/or msw (desirable) We have a preference for candidates who can work hybrid from ...

Pre-Sales Solutions Architect

Location
Greater London, England, United Kingdom
stakeholders Technical Experience: Experience building and architecting systems, including some of: Architecting solutions on AWS Finance and billing platforms API technologies such as GraphQL and webhooks Customer‐Centric & Analytical: Focused on solving the right problems and using data to measure success Agile & Autonomous: Comfortable navigating ambiguity in a fast‐paced ...

Principal Engineer, Mobile Platform & Backend Systems

Location
Greater London, England, United Kingdom
system evolution. Ability to develop a deep understanding of unfamiliar codebases and turn investigation into sound engineering decisions. Experience designing client-facing REST and GraphQL APIs, with sound judgment about business-logic placement, product states, and backward compatibility. Understanding of how mobile lifecycle and network constraints affect backend design. Strong ...

Frontend Engineer II

Location
Greater London, England, United Kingdom
strong accessibility guidelines Experience building scalable, performant sites that handle high levels of traffic well Our stack... React TypeScript (desirable) Next.js on Vercel (desirable) GraphQL w/Apollo (desirable) React Testing Library & Playwright Why else you'll love it here... Wondering what the salary for this role is? Just ...

Forward Deployed Infrastructure Engineer

Hiring Organisation
Hackajob Ltd
Location
South West London, London, United Kingdom
Employment Type
Permanent
market teams. Degree in Computer Science or a related field, or equivalent professional experience. Even better... Hands-on experience with Go services, GraphQL APIs, or LLM infrastructure in production environments. Past experience at an early-stage company where you built deployment operations, playbooks, and tooling. Familiarity with observability and incident ...

Forward Deployed Infrastructure Engineer - Spanish speaking

Hiring Organisation
Hackajob Ltd
Location
South West London, London, United Kingdom
Employment Type
Permanent
market teams. Degree in Computer Science or a related field, or equivalent professional experience. Even better... Hands-on experience with Go services, GraphQL APIs, or LLM infrastructure in production environments. Past experience at an early-stage company where you built deployment operations, playbooks, and tooling. Familiarity with observability and incident ...

Forward Deployed Infrastructure Engineer (Spanish speaking)

Location
Greater London, England, United Kingdom
market teams. Degree in Computer Science or a related field, or equivalent professional experience. Even better... Hands-on experience with Go services, GraphQL APIs, or LLM infrastructure in production environments. Past experience at an early-stage company where you built deployment operations, playbooks, and tooling. Familiarity with observability and incident ...

Principal Engineer, Mobile Platform & Backend Systems

Hiring Organisation
AlphaSense
Location
London, United Kingdom
Salary
£ 80 K
system evolution. Ability to develop a deep understanding of unfamiliar codebases and turn investigation into sound engineering decisions.Experience designing client-facing REST and GraphQL APIs, with sound judgment about business-logic placement, product states, and backward compatibility. Understanding of how mobile lifecycle and network constraints affect backend design.Strong understanding ...

Senior Software Engineer

Hiring Organisation
The Portfolio Group
Location
City of London, London, United Kingdom
Employment Type
Permanent
Salary
£90000/annum
agents. Develop agent-to-agent connectivity, including message contracts, state management, retries and failure handling. Design clear, scalable APIs using REST and/or GraphQL, including authentication, authorisation, versioning and streaming interfaces such as SSE or WebSockets. Build production frontend applications using React, TypeScript and JavaScript. Work closely with … backend and integration development. Strong TypeScript/JavaScript and React experience building production applications. Strong API design experience, including REST and/or GraphQL, authentication, authorisation, versioning and streaming. Hands-on experience with MCP (Model Context Protocol) or comparable tool/plugin integration technologies, alongside an interest in AI agents ...

Senior Software Engineer

Hiring Organisation
The Portfolio Group
Location
London, South East England, United Kingdom
Employment Type
Full-Time
Salary
£90,000 per annum
agents. Develop agent-to-agent connectivity, including message contracts, state management, retries and failure handling. Design clear, scalable APIs using REST and/or GraphQL, including authentication, authorisation, versioning and streaming interfaces such as SSE or WebSockets. Build production frontend applications using React, TypeScript and JavaScript. Work closely with … backend and integration development. Strong TypeScript/JavaScript and React experience building production applications. Strong API design experience, including REST and/or GraphQL, authentication, authorisation, versioning and streaming. Hands-on experience with MCP (Model Context Protocol) or comparable tool/plugin integration technologies, alongside an interest in AI agents ...

Senior Full Stack Software Engineer

Location
Greater London, England, United Kingdom
backend or frontend, plus enough range to work confidently across the others. Our technology stack consists of: React Native mobile applications React web applications GraphQL layer using Apollo Server and Apollo Client Python services running Flask and FastAPI Kubernetes based microservice architecture running on Google Cloud Platform Cloud Postgres … three areas above that isn't your main one Docker and containerised applications Building and consuming REST and GraphQL APIs Kubernetes, Terraform, or GCP Experience working with AI coding agents IoT and distributed connected hardware in the real world What we are offering in return The chance to build ...