Client Server

Senior Software Engineer Python AWS - Front Office

UKSenior

Automation AWS CI/CD Cloud Containerization +2 skills

Overview In this role you will design and build high-performance trading systems and cloud infrastructure to support front, middle and back-office operations. You will collaborate with stakeholders to translate complex…

Backend Software Engineer Python LLM

RemoteUK

AI AWS Cloud Conversational AI Infrastructure as Code +4 skills

Overview In this remote-first Backend Software Engineer role, you will build and maintain production-grade AI systems and the supporting infrastructure. You’ll own technical decisions, contribute to the evolution of a…

Lead Full Stack Engineer TypeScript Python API

HybridUKLead

Agentic AI AI Analytics API AWS +5 skills

Lead Full Stack Engineer at a profitable London private equity firm, working at the intersection of tech, data, strategy and investment — leading data diligence and shaping tech/data strategy for portfolio companies. Day to day spans TypeScript and Python development, cloud data platforms (AWS/Azure/GCP) and agentic AI, hybrid with three days a week in the London office.

100K – 125K £

Senior C#/.NET API Engineer — Full-Stack, Remote/WFH

RemoteUKSenior

API Api Design AWS C# SQL +1 skills

Senior C#/.NET engineer owning features end-to-end — API design, backend services, and Vue.js front-end delivery — on a global payments platform in the Corporate Payments division. Mostly work-from-home with occasional office days in Bracknell; AWS production experience is a plus.

Python Developer / Team Lead - FinTech

HybridUKLead

API AWS Azure CI/CD Cloud +7 skills

A hands-on Python Developer / Team Lead at a profitable FinTech start-up, leading a small team building features for a core banking platform that integrates with major banks like HSBC. Roughly a 50/50 split between architecture/design and people management, using Python, FastAPI and GCP in a hybrid London role.

100K – 120K £

Senior Python Developer / Consultant SaaS

HybridUKSenior

AWS CDK Cloud DevOps FastAPI +2 skills

Hands-on senior Python consultant building cloud-based SaaS for law firms at a profitable scale-up, leading bespoke client projects end-to-end from design to deployment on AWS using Python, FastAPI and CDK. Hybrid role based in Manchester (3 days on-site), salary up to £80k.

up to 80K £

Python Developer

Open 16d UK

AI AWS Azure Cloud C++ +6 skills

A Python backend developer joins an R&D team building a new greenfield product that uses AI to defend against AI-based cyberattacks. Day-to-day involves building complex Python backend systems, rapid prototyping, and working with Rust, TypeScript/C++ and cloud platforms (AWS/Azure/GCP) in a hybrid role based in Cambridge.

65K – 65K £

Senior Backend Engineer: Python, ML & AWS (Remote UK)

Open 17d RemoteUKSenior

AWS Machine Learning Python

Senior Backend Engineer building Python backend services to help produce and deploy machine learning models into production on AWS, working day to day with data scientists and ML engineers across the full ML lifecycle. Fully remote within England/UK, up to £90k, with flexible hours and mentoring opportunities.

up to 90K £

VP Data Technology Transformation - Private Equity

Open 19d HybridUKC-level

AWS Azure Ccpa Cloud Data Governance +8 skills

Overview As VP Data Technology Transformation, you will lead data strategy, diligence, and execution across the fund and portfolio companies. You’ll partner with c-suite investors and data leaders to align strategies,…

Senior Full Stack Engineer C# Vue.js

Open 21d UKSenior

API AWS CI/CD C# Distributed Systems +13 skills

Overview In questa role you will own and deliver features end-to-end across the tech stack for an international payments platform within a global financial services group. You’ll design scalable backend services in C#…

Full Stack Engineer: .NET/JS in Sports Tech (Hybrid)

Open 21d HybridUK

Angular AWS C# .NET JavaScript +4 skills

Client Server Limited is recruiting a Full Stack Engineer in St Albans (hybrid, two days WFH per week) for a fast-paced sports tech business, paying up to £100k. Day to day you deliver backend and frontend features across a microservices ecosystem using C# .NET Core, JavaScript/TypeScript, Angular, AWS, Kubernetes and Kafka.

up to 100K £

Mid-Level Full-Stack Engineer — Hybrid (£110k + Bonuses)

Open 21d HybridUKMiddle

AWS C# .NET Microservices

A mid-level full-stack engineer builds Payments and client-facing features for a technology-driven trading company, working in a C# .NET Core microservices stack on AWS. The role is hybrid in St Albans with 2 days of home working per week, plus bonuses and benefits.

110K – 110K £

Full Stack Engineer .Net JavaScript - Sports Betting

Open 21d HybridUK

Angular AWS Cloud C# Design Patterns +9 skills

Full stack engineer building platforms used to analyse and trade on global sports markets: designing features across a microservices ecosystem with C# .NET Core on the backend and JavaScript/TypeScript with Angular on the frontend, using AWS, Kubernetes and Kafka. Office-based in St Albans with 2 days WFH per week; salary up to £100k.

up to 100K £

Senior Python Developer FastAPI Azure

Open 21d UKSenior

AWS Azure CI/CD Cybersecurity Design Patterns +4 skills

Overview As a Senior Python Developer you combine hands-on coding with technical leadership to design and deliver a scalable SaaS calculation platform for cyber security insurance. You will shape architecture, set…

Web Developer JavaScript Angular - HealthTech

Open 21d UK

Agile Android Angular API AWS +8 skills

Overview In this role you will shape the frontend of a real-time shift rota platform, leveraging Angular 21 to modernise the web experience. You will work closely with a small team to influence best practices while…

Senior Data Engineer - Finance Data

Open 21d UKSenior

Airflow AWS Cloud Dagster Data Engineering +11 skills

Overview In this Senior Data Engineer role you shape a modern, cloud-based data platform on AWS for a finance-focused technology team. You will design and maintain scalable data pipelines and ingestion workflows,…

Lead Backend Engineer - Technologist

Open 21d UKLead

API Api Design AWS Azure Cloud +13 skills

Overview In this role you will lead backend engineering to design and implement core application logic, APIs and microservices for data processing and integrations, while ensuring secure, reliable server environments.…

Python Developer - Problem Solver

Open 21d UK

AI AWS Azure C++ Cybersecurity +5 skills

Backend Python developer role in a cybersecurity firm's R&D team near Cambridge (office twice a week), building a greenfield product that defends against AI-based attacks. Day to day: rapid prototyping, iterative backend development in Python with exposure to Rust and cloud platforms; salary to £65k.

up to 65K £

Lead Backend Engineer - Technologist

Open 21d UKFull-timeLead

API AWS Azure CI/CD Cloud +16 skills

Lead Backend Engineer joining the consulting division of Client Server's Newcastle office, serving a scaling FinTech. Day to day: designing backend logic, building APIs and microservices (Python, TypeScript), maintaining secure server environments, mentoring engineers, and gathering requirements directly with clients. Full-time onsite, salary to £130k + bonus.

up to 130K £