Client Server Limited

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 22d 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 22d 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.…

Senior Full Stack Developer TypeScript React API

Open 22d On-siteUKSenior

AI API React Rust TypeScript

Overview As a Senior Full Stack Engineer in our new UK operation, you will own the architecture and build products from the ground up in a fast-growing sports tech environment. You’ll work hands-on across the stack,…

Data Engineer SQL Databricks - Fintech

Open 22d UK

Analytics Azure Data Engineering Data Pipelines Databricks +5 skills

A data engineer joins a fintech in Newcastle upon Tyne to partner with front-office teams, building and operating the firm's data platform: automating data processes, designing robust pipelines, curating datasets, and enforcing data quality, primarily using Databricks (ideally on Azure), SQL, Apache Spark, and Python (PySpark/Pandas).

up to 120K £

Python Developer - Problem Solver

Open 22d 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 22d 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 £

Lead Backend Engineer - Python/TypeScript (Onsite, Newcastle)

Open 22d UKLead

API C# Fintech Python TypeScript

A hands-on lead role designing and building core applications and APIs for clients at a FinTech consultancy, based onsite in Newcastle. The engineer oversees secure server environments and architecture while mentoring others, working across Python, TypeScript, and C#.

Senior DevOps Engineer C# Azure - FinTech

Open 22d UKSenior

Automation AWS Azure C# DevOps +5 skills

Overview Senior DevOps Engineer in a tech-startup backed by an investment-management firm. You will establish and lead the DevOps function, automate infrastructure and CI, and enhance monitoring to improve reliability.…

Front End Developer TypeScript React - FinTech

Open 22d UK

Design Patterns OOP React SDLC TypeScript

Overview In this Front End role, you will design and build data-rich dashboards and interfaces for advanced trading systems. You’ll own technical projects within a small team, applying modern frontend practices to…

Front End Developer Typescript React - Fintech

Open 24d UKFull-time

Design Patterns Fintech OOP React TypeScript

Front End Developer building data-rich user interfaces and client dashboards for trading systems at a start-up investment management firm in central Newcastle (onsite, Mon-Fri). Core stack is TypeScript and React; salary up to £120k plus bonus.

up to 120K £

Python Developer SQL - Market Data

Open 25d UKFull-time

CI/CD Data Quality Distributed Systems ETL Infrastructure as Code +7 skills

A Python/SQL developer builds and operates a hedge fund's data platform in Central London: developing microservices, ETL processes and Excel add-ins, maintaining databases, and improving infrastructure (IaC, monitoring, disaster recovery) while supporting day-to-day platform reliability.

up to 150K £

Client Server Ltd.

Senior C# Backend Engineer: API, Microservices, WFH

Open 25d UKSenior

AI API AWS Cloud C# +4 skills

Client Server Ltd. in Bracknell, Berkshire seeks a senior backend C# Developer to lead the rebuild of a payments platform. You’ll own backend services, build robust APIs with C# .Net Core, and influence architecture…

TypeScript Backend Engineer: Cyber Security | Hybrid/Remote

Open 25d UK

A backend software engineer designs and builds TypeScript backend services for a cybersecurity company's customer portal in Cambridge, taking ideas from rapid prototypes to production in a fast-paced R&D environment. Hybrid working with Cambridge office presence and work-from-home options.

TypeScript

Likely evergreen UKFull-timeSenior

Senior Full Stack Developer TypeScript React API

AI API React Rust TypeScript

Senior Full Stack Developer TypeScript React API London, Greater London | £100k - £120k per year Senior Full Stack Engineer / Developer (TypeScript React API Rust) London onsite to £120k Opportunity for a Senior /…

Quantitative Developer Python C++ - MFT

Open 25d RemoteUK

C++ Java NumPy pandas Python +1 skills

A quantitative developer at a global trading firm in London joins a new team building a greenfield mid-frequency trading (MFT) platform for equities, designing and implementing trade execution algorithms (TWAP/VWAP) in Python and C++. Hybrid role (3 days in the London office) with base salary up to £175k plus discretionary bonuses.

up to 175K £

Senior Python Developer FastAPI Azure

Open 26d HybridUKSenior

AWS Azure CI/CD Cybersecurity Design Patterns +4 skills

Senior hands-on backend Python engineer at a fast-growing insurance underwriting SaaS provider, hybrid based in London (3 days/week in office). Day to day: design and build FastAPI services on Azure, work with data at scale, and provide technical leadership — code reviews, mentoring, and driving CI/CD and quality practices.

up to 110K £

Senior C# / .NET Core Backend Engineer – FinTech (Newcastle)

Open 27d UKSenior

Senior C# / .NET Core backend engineer at Client Server Limited, working on-site in Newcastle upon Tyne to build complex FinTech-grade systems. You own technical projects and contribute across the full development lifecycle, with a salary of up to £110k+ plus bonus, healthcare, and pension.

Lead Python Backend Engineer (APIs, FastAPI) – Hybrid

Open 27d UKLead

API CI/CD Cloud FastAPI Fintech +1 skills

Lead a small London tech team building and refactoring a core banking platform, splitting time 50/50 between architecture/design and people management. Day-to-day work spans API development with Python/FastAPI, GCP cloud services, and CI/CD in a hybrid fintech setting.