76 to 100 of 145 React Jobs in the City of London

Full-Stack Java Engineer (Mid-to-Senior) - Remote First | Full-Time or 4-Day Equivalent

Hiring Organisation
PhixFlow
Location
City of London, London, United Kingdom
within large, enterprise-scale codebases. ● Solid proficiency in Java (deep server-side development and platform architecture familiarity). ● Strong experience with JavaScript, TypeScript and React (front-end development, with an interest in UX/UI principles). ● Expertise in SQL and designing/optimising relational database schemas. ● We seek deep … following or similar technologies and concepts is highly valuable: ● Backend: Java, Spring, Hibernate, multi-threading/concurrency, Quarkus/Micronaut. ● Frontend: JavaScript, TypeScript, React, D3.js, SVG, CSS. ● Database: SQL (SQL Server, MySQL, Oracle), Data Modelling. ● Infrastructure: Cloud Platforms (Azure, AWS), Git. ● Advanced Topics: AI/LLM (Large Language Models), Small ...

Founding AI Engineer

Hiring Organisation
Oliver Bernard
Location
City of London, London, United Kingdom
Hybrid) Salary : £100k–140k Equity : 1–3% (founding-level) Hybrid working: Central London, 3 days p/week in office. Tech Stack: TypeScript, Node.js, React, Python, LangChain, OpenAI/Anthropic I’m working with a YC-backed startup that’s building the next generation of AI-native analytics . This ...

Founding Engineer (TypeScript / AI)

Hiring Organisation
Oliver Bernard
Location
City of London, London, United Kingdom
Hybrid) Salary : £100k–140k Equity : 1–3% (founding-level) Hybrid working: Central London, 3 days p/week in office. Tech Stack: TypeScript, Node.js, React, Python, LangChain, OpenAI/Anthropic I’m working with a YC-backed startup that’s building the next generation of AI-native analytics . This ...

Full stack Engineer AI

Hiring Organisation
Bloc Recruitment
Location
City of London, London, United Kingdom
Employment Type
Permanent
Salary
£90,000
traditional ML) Design and implement data strategies for AI development and training Requirements 4+ years' experience across Fullstack development (Python/Modern JavaScript (React, Vue or similar) Experience working with LLMs, Scientific tools Strong command of Python and relevant AI/ML frameworks Startup experience preferred Benefits Strong equity options ...

Full Stack Engineer

Hiring Organisation
Oliver Bernard
Location
City of London, London, United Kingdom
+ meaningful equity 🏙️ Location : London, flexible working arrangements, ideally 1/2 days in office 💻 Tech Stack : Python, Flask, FastAPI, React, TypeScript, GCP (Backend Leaning) Our y-combinator backend client are building an elite engineering team within the AI space. The platform is being used across the globe ...

Full Stack Product Engineer

Hiring Organisation
Oliver Bernard
Location
City of London, London, United Kingdom
with less than 10 heads, and they're now looking for a founding-level engineer to join the core London team. Tech stack: Frontend : React, Next.js, TypeScript Backend : Python, FastAPI Happy for candidates to lean towards to backend or the frontend Why this role stands out: Stealth-stage, high-impact ...

Backend Engineer, Contract | Python (Django), Java and Rust | Fully Remote / EU-Based | Rate £550-650pd, Outside IR35 | 12-months Contract Length

Hiring Organisation
Owen Thomas | Pending B Corp™
Location
City of London, London, United Kingdom
Outside IR35 | 12-months Contract Length Senior-level backend experience with Python and Django in production systems Proven work with JavaScript and React (production experience strongly preferred) Familiarity with MySQL Databases and scale Strong grasp of APIs, cloud-native systems, and scalable architecture Freelance mindset: able to hit the ground ...

Founding AI Engineer – London - £180K plus equity

Hiring Organisation
Halian | Managed Services, Recruitment Agency & Contract Staffing
Location
City of London, London, United Kingdom
modern web technologies ·Make foundational technical decisions that shape the company’s trajectory Tech you’ll work with ·Python, LLMs, vector databases, knowledge graphs ·React/TypeScript, Supabase, AWS ·Agent frameworks (e.g., LangChain, LangGraph) What they are looking for · Ownership mindset: You think like a founder and execute without waiting ...

Founding Engineer

Hiring Organisation
SR2 | Socially Responsible Recruitment | Certified B Corporation™
Location
City Of London, England, United Kingdom
Location: London (hybrid) Salary: Up to £100,000 ( 10% DOE) + equity Tech Stack Python ecosystem - experience with Django, or Flask, or FastAPI TypeScript & React across the frontend - any frontend experience beneficial Cloud native environment This is not a “slot into an existing team” role. This is a build ...

Full Stack Engineer

Hiring Organisation
Reed Professional Services
Location
City of London, London, United Kingdom
Python to create robust, scalable server-side logic. Implement responsive and visually appealing front-end designs using HTML, CSS, JavaScript, and modern frameworks like React, Angular, or Vue. Design and manage API integrations, ensuring seamless data flow between different software components. Work with SQL and NoSQL databases to store … proficiency in Java and Python. Hands-on experience with API development and integration. Solid understanding of HTML, CSS, JavaScript, and modern front-end frameworks (React, Angular, or Vue). Experience with databases (SQL and NoSQL). Familiarity with version control systems (Git). Knowledge of cloud platforms (AWS, Azure ...

.NET Developer

Hiring Organisation
Noir
Location
City of London, London, England, United Kingdom
Employment Type
Full-Time
Salary
£70,000 - £90,000 per annum
.NET Developer, C# 14 - Global Technology Brand - London (Tech stack: .NET Developer, .NET 10.0, ASP.NET, C# 14, WPF, React, Angular 21, Microservices, Azure, ASP.NET Core Web API, Entity Framework, Agile, Programmer, Full Stack Engineer, Architect, .NET Developer) Our clients fascinating story dates back to 1981; today they have fast become … development (.NET Core, C#) or winforms/WPF (C#) development. Our client will provide you with training into: .NET 10.0, WPF, MVVM, Prism, JavaScript, React, Angular 21, Microservices, MongoDB, Vue.js, TypeScript, Azure, AWS, ASP.NET Core Web API, Entity Framework, Node.js, Elasticsearch, Agile, TDD, BDD, Scrum, Kanban and Azure SQL. ...

Senior Product Engineer

Hiring Organisation
Oliver Bernard
Location
City of London, London, United Kingdom
Title: Senior Product Engineer Location: Hybrid – 3 days/week in Central London office Salary: Up to £150k + Equity Tech Stack: Go, TypeScript, React (open to other strong technical backgrounds) ✅ What They’re Looking For Engineers who think like product owners Prior startup success or fast-paced environment experience ...

VP Java FX Strategist Global Markets London

Hiring Organisation
McGregor Boyall Associates Limited
Location
City of London, London, United Kingdom
Employment Type
Permanent
market-making Strong understanding of FX microstructure , order management, or regulatory flows Bonus experience: Spring Boot, Gradle, Solace, FIX, concurrent programming, JVM tuning, React/Vue Ability to utilise AI coding assistants effectively while maintaining code quality Strong communicator with the ability to influence technical and business stakeholders Degree ...

Lead Engineer

Hiring Organisation
Explore Group
Location
City of London, London, United Kingdom
Actively experiment with and refine AI-assisted development workflows Have built LLM-powered systems or AI agents in production environments Tech Stack TypeScript monorepo React, tRPC, Tailwind Event-driven workflows and background jobs Deployed on Google Cloud Platform Postgres What’s On Offer £100,000 – £150,000 base salary (depending ...

Senior Fullstack Engineer (Remote First)

Hiring Organisation
MCS Group | Your Specialist Recruitment Consultancy
Location
City of London, London, United Kingdom
production Using AI-assisted tools to boost productivity and innovation Participating in code reviews and mentoring other engineers Tech environment: Java, Spring Boot, React, Python, Kubernetes, Terraform, Jenkins, AWS, SQL About you: experience in software development (SaaS or cloud environments) Strong skills in Java and modern JavaScript frameworks (React/ ...

.NET Developer

Hiring Organisation
Noir
Location
City of London, London, England, United Kingdom
Employment Type
Full-Time
Salary
£50,000 - £80,000 per annum
.NET Developer, .NET 10.0, C# 14 - Consultancy - London Or Surrey (Tech stack: .NET Developer, .NET 10.0, ASP.NET Core, C# 14, Blazor, JavaScript, React, Microservices, Azure, ASP.NET Core Web API, Agile, Azure SQL, Programmer, Full Stack Engineer, Architect, .NET Developer) Our client is an award winning Microsoft consultancy. They specialise … software development methodologies is of interest (Agile, Scrum). My client will provide training in: .NET 10.0, ASP.NET Core, C# 14, Blazor, JavaScript, React, Microservices, Azure, ASP.NET Core Web API, MongoDB, Azure, AWS, Node.js and Elasticsearch. This is a truly exciting project, one which if you are given the opportunity ...

Staff React Engineer (TypeScript + AI Experience)

Hiring Organisation
Wizeline
Location
City of London, London, United Kingdom
Staff React Engineer (TypeScript + AI Experience) We are: Wizeline, a global AI-native technology solutions provider, develops cutting-edge, AI-powered digital products and platforms. We partner with clients to leverage data and AI, accelerating market entry and driving business transformation. As a global community of innovators, we foster … sure you’re a good fit for the role: Key Responsibilities Lead the architecture, design, and development of scalable, high-performance web applications using React and TypeScript . Define and execute the front-end technical strategy , ensuring scalability, performance, and alignment with product and AI goals. Collaborate closely with ...

Clinician Engineer at Eolas Medical

Hiring Organisation
Eolas Medical
Location
City of London, London, United Kingdom
Node.js/TypeScript Python PostgreSQL & DynamoDB Serverless architecture & microservices Docker, CI/CD pipelines Cloud security & compliance (HIPAA/GDPR/NHS DTAC) Frontend React TypeScript Tailwind Component-driven development AI/RAG/Knowledge Pipelines LLM-powered features RAG pipelines (embedding models, chunking strategies, semantic search) Document extraction/… with doctors, engineers, and leadership to shape product direction. Full-Stack or Backend Engineering Build and ship cloud-first features using TypeScript/Node.js, React/Next.js, and AWS. Contribute to infrastructure-as-code and deploy serverless services. Help architect systems that scale to hundreds of thousands of clinicians. ...

Full Stack Engineer

Hiring Organisation
UST
Location
City of London, London, United Kingdom
Entity Framework Core for database access and ORM operations. Build microservices and event-driven components. Frontend Development Develop responsive and modular UI components using React . Work with React Hooks , functional components, and state management (Redux/Context API). Ensure UI/UX best practices and high-quality front … 10+ years of professional experience in software development. Strong backend engineering with C#/.NET Core (6+). Solid experience developing REST APIs. Strong React development expertise. Proficiency with SQL Server, stored procedures, indexing, and performance tuning. Practical experience with Azure services: App Services, Functions, APIM, Service Bus, Key Vault ...

Lead Product Engineer (GO)

Hiring Organisation
Oliver Bernard
Location
City of London, London, United Kingdom
Engineer Location: Hybrid – 3 days/week in Central London office Salary: £120k to £180k (Depending on experience) + Equity Tech Stack: GO, TypeScript, React, Next.js ✅ What They’re Looking For Engineers who think like product owners Prior startup success or fast-paced environment experience A background in top-tier ...

Frontend Lead

Hiring Organisation
Understanding Recruitment
Location
City of London, London, United Kingdom
into Engineering Manager over time. This is a frontend-leaning leadership role, focused on: Web performance SEO Landing pages Experimentation and optimisation Tech stack: React, Typescript, Tailwind, Astro As a profitable, employee-owned, full product-led company, this is an opportunity you don’t want to miss! You will enjoy ...

Head of Engineering

Hiring Organisation
Few&Far
Location
City of London, London, United Kingdom
Scale: Serving millions through mobile, web, and desktop products, with a B2B arm trusted by global tech leaders. The Tech: Modern stack including React, Next.js, TypeScript, Golang and more. The Culture: Fast-paced, autonomous, and built by a team that values real impact over red tape. Here’s what ...

.NET Developer

Hiring Organisation
Noir
Location
City of London, London, England, United Kingdom
Employment Type
Full-Time
Salary
£40,000 - £50,000 per annum
.NET Developer, .NET 10.0, C# 14, Agile - London (Tech stack: .NET Developer, .NET 10.0, ASP.NET Core, C# 14, Blazor, JavaScript, React, Microservices, Azure, ASP.NET Core Web API, Agile, Azure SQL, Programmer, Full Stack Engineer, Architect, .NET Developer) We are pleased to announce the arrival … have commercial experience with: .NET, .NET Core, C#, Azure SQL and Agile. Full training will be provided into: .NET 10.0, C# 14, Blazor, JavaScript, React, Microservices, Azure, ASP.NET Core Web API, Agile, Azure SQL, Node.js, Elasticsearch and MongoDB. If you are dedicated to the youthful optimism of problem solving through ...

Graduate .NET Developer

Hiring Organisation
Noir
Location
City of London, London, England, United Kingdom
Employment Type
Full-Time
Salary
£35,000 - £60,000 per annum
Graduate .NET Developer - Investment Bank - London (Tech stack: Graduate .NET Developer, .NET 10.0, ASP.NET Core, C# 14, Blazor, JavaScript, React, Microservices, Azure, ASP.NET Core Web API, Agile, Azure SQL, Programmer, Full Stack Engineer, Architect, Graduate .NET Developer) Our client is the world's most respected banking institution. Their story dates … C#.NET winforms) and Azure SQL. Our client offers training in: Our client offers training in: .NET 10.0, ASP.NET Core, C# 14, Blazor, JavaScript, React, Microservices, Azure, ASP.NET Core Web API, Agile, Azure SQL, Node.js, Elasticsearch and MongoDB. This is a truly amazing opportunity to work for a prestigious banking brand ...

.NET Developer

Hiring Organisation
Noir
Location
City of London, London, England, United Kingdom
Employment Type
Full-Time
Salary
£60,000 - £80,000 per annum
.NET Developer, .NET 10.0, C# 14, Azure SQL - Investment Bank - London (Tech stack: .NET Developer, .NET 10.0, ASP.NET Core, C# 14, Blazor, JavaScript, React, Microservices, Azure, ASP.NET Core Web API, Agile, Azure SQL, Programmer, Full Stack Engineer, Architect, .NET Developer) Our client is the world's most respected banking institution. … skill set that encompasses: .NET, .NET Core, C# and Azure SQL. Our client offers training in: .NET 10.0, ASP.NET Core, C# 14, Blazor, JavaScript, React, Microservices, Azure, ASP.NET Core Web API, Agile, Azure SQL, Node.js, Elasticsearch and MongoDB. This is a truly amazing opportunity to work for a prestigious banking ...