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305 jobs

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305 jobs Posted Sort

Java Developer AI Claude - FinTech

Hands-on backend Java role at a scaling FinTech in Newcastle, modernising a C++ trading system into a scalable, high-performance real-time Java platform for Front Office traders. Involves architectural ownership and use of AI-assisted tools like Claude; salary up to £120k plus bonus.

AI C++ Fintech Java Multithreading

Client Server Limited

Python Software Engineer Machine Learning Aws

Senior hands-on Python engineer at a European car insurance tech company, joining a cross-functional team to implement machine learning algorithms into production underwriting and pricing systems. Core stack is Python, AWS and ML tooling (Databricks, PostgreSQL, Redshift, MLflow); fully remote within England, salary up to £90k.

Agile AWS Databricks Design Patterns Machine Learning +6 skills

Python Software Engineer Conversational AI

A remote, hands-on engineer role designing and building production-grade AI systems and backend services for a conversational AI platform. Day to day you work with Python, LLMs, AWS, TypeScript, Node.js and infrastructure as code, owning technical decisions and evolving the architecture.

AI AWS Conversational AI Infrastructure as Code LLM +3 skills

Software Engineer Python SQL - Market Data

A hands-on Python engineer builds and maintains components of a financial market-data platform: designing ETL pipelines, data lakes/lakehouses and distributed microservices, while improving infrastructure, CI/CD and observability. Core stack is Python and SQL with relational, NoSQL and columnar databases.

CI/CD Data Engineering Data Lake Distributed Systems ETL +6 skills

Client Server Limited

Python Developer – Data Platform & ETL (London)

A Python developer at a London hedge fund builds and optimises a data platform, working on ETL pipelines, microservices, and databases with a focus on data quality and reliability. The role involves CI/CD workflows, code reviews, and supporting logs, monitoring, and observability.

CI/CD Data Quality ETL Microservices Observability +1 skills

Python Developer / Team Lead - FinTech

Hands-on Team Lead for a core banking platform at a well-funded FinTech in London: split roughly 50/50 between hands-on Python/FastAPI architecture, refactoring and feature delivery, and leading/mentoring a small team. Stack is Python with FastAPI APIs, cloud (GCP preferred), and CI/CD.

API AWS Azure CI/CD Cloud +7 skills

React Developer Senior / Lead

Hands-on Lead React Developer owning the frontend of a core product at a scale-up: leading front-end architecture, integrating APIs and real-time data, setting tooling and build pipelines, and mentoring junior developers. Core stack: React, JavaScript/TypeScript, Redux/Context API. London-based with hybrid/remote flexibility; salary up to 90k plus potential equity.

API JavaScript React Redux TypeScript

Senior Python Developer - Cyber Security

A Senior Python Developer / Backend Software Engineer builds backend systems at a cybersecurity company in London that uses AI to defend clients worldwide from advanced cyber threats. Day to day: Python backend development on complex systems, with hybrid/WFH options and a salary up to £85,000.

AI Cybersecurity Python

Client Server Limited

London Backend Engineer (C#/.NET) - Sports Trading, Onsite + Bonus

Backend Engineer (C#/.NET) joining a sports trading team onsite in London, building robust backend systems, APIs and data flows for high-availability trading. Core stack: C#/.NET, ASP.NET, and SQL or Oracle.

API C# .NET Oracle SQL

Founding Software Engineer Python - Start-Up

Founding full-stack engineer at an early-stage AI start-up building compliance and operational-efficiency technology for the NHS and other regulated industries. You own Python/TypeScript development end to end — architecture, FastAPI backend services, React frontend, and Azure CI/CD — working hybrid from London and Cambridge.

Agentic AI AI API Azure CI/CD +10 skills

Backend Software Engineer Python R&D

Backend Software Engineer (Python, R&D) for a cybersecurity technology company that uses AI to protect clients globally from advanced cyber threats. The role involves problem solving on complex backend systems and pays up to £85k, based in London/Cambridge with work-from-home flexibility.

AI Cybersecurity

Technical Product Manager - Platform Engineering

A hands-on Technical Product Manager role on a global Platform Team at a fintech, focused on SaaS platform engineering. Day to day you'd drive product decisions for the platform, working flexibly from Reigate or home, earning up to £100,000.

Client Server Limited

Hybrid C#/.NET Full-Stack Engineer | AWS Microservices

A C#/.NET full-stack engineer builds high-scale .NET Core backend services using AWS microservices and real-time data for sports analytics and trading platforms. This is a hybrid role near St Albans with two days per week working from home.

Analytics Cloud C# .NET

100K – 100K £

Client Server Limited

Senior C# .NET Full-Stack Engineer – Remote

Senior full-stack engineer owning features end-to-end (API, backend, frontend) with C# .NET and Vue.js for an international payments platform, including architecture ownership and collaboration with Product, Design and Compliance. Mostly work-from-home with twice-weekly presence in the Bracknell office (hybrid).

API C# .NET Vue

Client Server Limited

Senior C# .NET API Engineer – Full-Stack, Remote

Senior C# engineer owning features end-to-end: designing scalable .NET APIs and backend services, building Vue.js frontend components, and driving architectural decisions while mentoring others and modernising legacy systems. Remote-friendly, with office presence twice weekly in Bracknell.

API C# .NET Vue

Client Server Limited

Backend Engineer TypeScript – Remote/WFH Cyber Security

Builds and owns TypeScript backend services for a cybersecurity company's customer portal, taking features from rapid prototype to production-ready systems with a security focus. Hybrid role: two days per week in the Cambridge office, the rest working from home.

Client Server Limited

Python Backend Engineer – AI Security R&D (Cambridge)

A Python backend engineer joins the R&D team in Cambridge to build a new greenfield product that combats AI-based security threats, delivering complex backend systems through rapid prototyping and iterative development, mainly in Python with exposure to Rust and TypeScript, in a hybrid work arrangement.

AI Prototyping Python Rust TypeScript

Client Server Limited

Front Office C++ Backend Engineer - London Hybrid to £125k

Senior C++ backend engineer building a core equity trading system for front-office desks in London. Day-to-day is C++17/20 on Linux tackling low-latency, high-volume data challenges alongside traders. Hybrid role (one day a week from home), paying up to £125k plus bonus.

C++ Design Patterns Linux

Client Server Limited

Backend Engineer (C#/.NET) - Trading Systems, London

Backend engineer building high-performance trading systems in C#/.NET with SQL for a hedge fund technology team in London, collaborating with quantitative researchers on valuation and pricing components and owning projects from design through delivery.

Client Server Limited

Backend Developer Typescript - Cyber Security

Backend Developer designing and building TypeScript backend services for the customer portal at a leading cyber security technology company in Cambridge (hybrid, 2 days/week in office), protecting organisations from AI-driven cyber threats. Stack includes TypeScript and Kubernetes, with Python/Rust desirable.

AI Containerization Cybersecurity Kubernetes Python +2 skills