76 to 100 of 299 React Jobs in the City of London

with Product Managers and Engineering Managers to design and build robust backend systems that solve real-world, large-scale problems. Tech Stack Python, Django, React, AWS, Kubernetes, Docker Key Responsibilities Develop, maintain, and scale APIs, microservices, and data pipelines to support core business functions Troubleshoot, refactor, and maintain existing systems ...

Requirements 5+ years’ experience building production-grade software Expertise in backend development using C++, Rust, Java, or Python Strong experience with front-end frameworks (React, Angular, or equivalent) Proven ability to work across distributed systems and real-time applications Comfortable working in an early-stage, high-trust environment Nice ...

have expertise with C# .Net, ASP.Net development You have a strong knowledge of databases (SQL or Oracle) You're comfortable with JavaScript/React You have a thorough knowledge of Computer Science fundamentals such as OOP, Design Patterns, Data Structures, Algorithms You are collaborative with excellent communication and stakeholder management ...

ones we haven’t discovered yet) Tech you’ll work with ·Python + TypeScript/Node.js (in equal measure) ·API integrations, ETL, schema validation ·React/TypeScript, Supabase, AWS ·Data quality systems and pipeline tooling ·Whatever the mission requires — we optimise for impact, not rigidity What matters most · Ownership ...

overall system design: service boundaries, data ownership, scaling, and observability Essential Qualifications: Built modern full-stack applications (Python/Java/Go + React) Worked with a variety of storage technologies (eg. Postgres, Mongo, Redis, Object) Experience with async and bi-directional communication protocols and patterns (eg. WebSockets, SSE) Designed ...

scalability. Key Responsibilities Design, develop, and maintain custom ASP.NET MVC web applications and SharePoint solutions. Implement responsive, user-friendly interfaces using frameworks such as React , Angular , Bootstrap , and jQuery . Develop and optimize SQL databases to support application needs. Utilize low-code platforms like PowerApps and Power Automate to streamline ...

understanding of data structures, algorithms , and performance optimisation . Experience building complex, highly scalable systems — not just CRUD interfaces. Familiarity with frameworks such as React, Angular, or Vue , and a strong grasp of how they interact with the DOM. Ability to diagnose bottlenecks, eliminate memory leaks, and optimise rendering ...

someone with the following: • Proven experience architecting and scaling B2B SaaS platforms • Strong full-stack technical expertise - especially across C#, JavaScript, and ideally React • Experience integrating with APIs and identity platforms such as Microsoft Entra ID/Azure AD • Solid understanding of cloud infrastructure - ideally Azure and Service Fabric/ ...

stakeholders. Strong problem-solving and analytical mindset. Desirable: Experience with BI tools (e.g., Power BI, Plotly/Dash) for visualization. Experience in frontend development – React/Javascript Experience in structuring APIs – Django, Flask, FastAPI Familiarity with distributed systems (e.g., Spark, Kafka) for large-scale analytics. Knowledge of testing practices (e.g. ...

shipped something end-to-end FinTech or financial services experience Familiarity with LLM or ML integration in production environments Experience with Django (backend) and React (frontend) Experience working on or developing public APIs What we value ❤️ End-to-end ownership 🛠️ You don’t just wait to be told what ...

most complex challenges. You’ll design and build modern applications leveraging technologies such as Java (Spring Boot), NodeJS, RESTful microservices, React, NoSQL and cloud platforms, all while working closely with multi-disciplinary teams. You’ll work on a broad variety of projects – from greenfield builds to large-scale modernisation – with … digital services. Key Responsibilities Design and deliver high-quality microservices using Java (Spring Boot) Build user-centric front-end applications using JavaScript/TypeScript, React, HTML and CSS Develop cloud-native solutions on platforms such as AWS or Azure Use CI/CD pipelines and version control tools to ensure ...

Job Summary: The Trading and Risk Management System (TRMS) team is responsible for developing, supporting and maintaining our front and back office trading web applications using Python, the proprietary Beacon Dependency Graph and Glint, the ...

Implement and maintain secure, scalable cloud environments Stay hands-on across the full stack, contributing to development of system built in Python, TypeScript, Node.js, React, and Postgres/NoSQL Essential Experience: 5+ years experience in Cloud Architecture & DevOps Experience designing and implementing secure systems Leadership experience Desirable Skills: Exposure ...

performance and streamline development workflows, In addition you will ensure code quality, reliability, and security across their systems. Key Skills: Java, Spring Boot TypeScript, React.js Azure, CI/CD, IaaS, DevSecOps Contract Details: Up to £450 per day, Outside IR35 3 months (rolling) Hybrid London This is an exciting opportunity ...

have a deep engineering expertise and wide curiosity across product, design, and AI. Key requirements: 5+ years of fullstack development experience. Strong skills in React, TypeScript Node AWS Experience integrating AI/ML via APIs If you’re a Senior Fullstack Developer who enjoys the idea of working ...

experience • Comfortable working in an Agile setup and collaborating closely with others • A team-focused, lead-by-example approach Additional skills: Scala + React/TypeScript • Experience building modern front-end applications Scala + AI • Experience building AI agents using relevant frameworks • Understanding of LLMs, RAG, tool-building, etc. • Ability ...

whilst promoting excellent coding practices throughout the team Tech stack: Java 11-17, Springboot PostgreSQL/Kafka AWS/Kubernetes/Terraform Typescript/React Benefits: 10% bonus Life assurance 25 days annual leave (option to buy 5 extra) Flexible/hybrid working Work from anywhere up to 4 weeks ...

Highly skilled in Python development, with knowledge of FastAPI framework. Good databases knowledge with schema design and SQL. Some front-end development preferably TypeScript & React is highly desirable. Experience of designing scalable systems and working with CI/CD pipelines. Experience in data-driven applications, cyber security, or SaaS platforms ...

scale, ideally threat intel/offensive security, in B2B SaaS start-ups or high-growth scale-ups • Strong technical grounding across Node.js, Typescript, React, MySQL and cloud-native architectures (AWS, ECS/K8s, Kafka, Airflow) • Comfortable driving Agile and DevOps culture, and setting high standards for clean, testable, secure code ...

expertise in the following areas: Building and managing microservices and APIs Strong commercial experience in Python or Node FE experience - Ty/JS, React Good Cloud Experience (they are AWS house) Good experience utilizing various database technologies Comfortable working within an Agile team environment . 🛠️ Key Responsibilities Contribute across ...

quality technical assessments during product discussions Maintain balance between team empowerment and hands-on guidance Tech Environment Backend: Node.js/NestJS (must-have) Frontend: React/Angular (either is fine) Python: Not day-to-day, but strong understanding needed to oversee ML/data science function Cloud: GCP stack ...

genuine enthusiasm to learn) Collaboration style - You work well with others but are equally effective independently Nice to Have: Experience with modern frontend frameworks (React, etc) Background in API development or distributed systems For more information, please apply! *Please note that this role will not be able to provide sponsorship ...

working with Next.js App Router, Server Components and high performance API routes Experience building websites using modern frameworks, libraries, languages and tooling such as React, Next.js, TypeScript, GraphQL, Jest and Playwright Fantastic knowledge-sharing skills to effectively communicate technical concepts in a variety of formats A proven ability to build ...

environments. What you’ll do Build end-to-end web applications and APIs used by thousands across secure environments. Ship modern TypeScript apps with React (Vite/Material-UI) and backends in Node.js/Express (bonus: C#/.NET or Python/Django ). Design and document clean REST/… observability and performance . Collaborate with product, platform, and security teams to meet operational and compliance requirements. The toolkit you’ll use Frontend: TypeScript, React.js, Vite, Material-UI, HTML5, CSS Backend: Node.js, Express.js (nice-to-have: C#/.NET, Python/Django) APIs & Data: REST/JSON, SQL, PostgreSQL/ ...

Senior Software Engineer Node.js/AWS/React London (Hybrid, 3 days onsite) Are you the kind of Senior Software Engineer who enjoys taking something fast-and-scrappy and turning it into something scalable, elegant, and genuinely robust? This is a chance for a Senior Software Engineer to join ...