Client Server

Lead Software Engineer Python API - Fintech

UKLead

API Api Design AWS Azure CI/CD +8 skills

Overview As Lead Software Engineer you will steer a small tech team to deliver features, perform refactoring, and contribute to a core banking platform. You will balance architecture work with people management to…

Founding Software Engineer (Python) - AI for Compliance

HybridUK

AI Azure CI/CD Cloud Cloud Native +2 skills

Client Server is seeking a Founding Software Engineer (Python) in the UK to help shape core technology and product in a fast-growing AI startup. You will own the design and build of cloud-native applications, spanning…

Backend Software Engineer Python ML AWS

RemoteUK

Agile AWS Databricks Design Patterns Machine Learning +6 skills

Backend Software Engineer / Developer (Python Machine Learning AWS) Remote UK to £90k Are you a data savvy Backend Software Engineer with experience of implementing ML algorithms into production? You could be…

Backend Software Engineer Python LLM

RemoteUKFull-time

Agentic AI AI AWS Conversational AI Infrastructure as Code +4 skills

Backend Software Engineer / Developer (Python LLM) Remote UK to £90k Are you a backend focussed Software Engineer looking for an opportunity to progress your career, whilst working remotely on a modern tech stack? You…

Software Engineer Python SQL - Market Data

UKFull-time

CI/CD Data Engineering Data Lake Distributed Systems ETL +7 skills

Software Engineer Python SQL - Market Data London, Greater London | £130k - £150k per year Software Engineer / Developer (Python SQL) London to £150k+ Are you a data savvy Software Engineer with strong Python coding…

Lead Software Engineer Python Api - Fintech

API AWS Azure CI/CD Cloud +7 skills

Lead Software Engineer / Developer London / WFH to £120k Are you a skilled a backend focussed Python technologist with team leadership experience? You could be progressing your career at a well-funded and profitable…

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…

Senior Java Developer Spring Boot TDD

UKSenior

Senior Java Developer / Backend Engineer (Spring Boot TDD) Manchester / WFH to £78k Are you a Senior Java Developer with hands-on leadership skills? You could be progressing your career at a global games software…

Java Spring TDD

Lead Full Stack Engineer TypeScript Python API

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 £

Lead Full Stack Engineer (TypeScript + Python) – Hybrid London

Lead a full stack engineering effort in London, blending hands-on TypeScript and Python API development with strategic leadership of data transformation across a private equity portfolio. Hybrid role with London office presence.

API Python TypeScript

Senior Java Backend Engineer — AI-Assisted RealTime Trading

UKSenior

Senior Java backend engineer modernising a high-performance real-time trading system onsite in Newcastle upon Tyne. Day to day: hands-on backend Java development, architectural input on latency-sensitive design, and collaboration with Front Office and engineering teams, using AI tools like Claude to speed up delivery.

AI Java

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.

Senior Systems Engineer SRE Golang - FinTech

AfricaSenior

South Africa

Senior Systems Engineer (SRE Golang) to £130k Are you an experienced Systems Engineer with a strong knowledge of modern software infrastructure and robust APIs? You could be progressing your career in a hands-on Senior…

API Fintech Go SRE

Java Developer AI Claude - FinTech

UKFull-time

Senior hands-on Java backend developer at a scaling FinTech in Central Newcastle, modernising a C++ trading system into a scalable, low-latency Java application while using AI tools like Claude. Full-time onsite Monday to Friday, collaborating closely with Front Office trading teams.

AI C++ Fintech Java

100K – 120K £

Senior React Frontend Lead - Remote-Friendly with Equity

Senior/lead React developer to own the frontend of Client Server's core product — a financial operating system for live events — leading frontend architecture, improving performance and usability, collaborating with product/design, and mentoring juniors. Hybrid role based in London (3-4 office days/week) with equity on offer.

React Developer Senior / Lead

UKLead

Senior/Lead React Developer owning the front end of a scale-up's core product — a financial operating system for live events — leading architecture, staying hands-on with React, integrating payment flows and real-time data, and mentoring junior developers. London-based with WFH flexibility after the first six months.

80K – 90K £

Python Developer / Team Lead - FinTech

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 £

Lead Python Developer & Team Lead — Hybrid (London)

Lead a small London tech team as a hands-on Python Developer & Team Lead, splitting time 50/50 between architecture/design and people management while delivering features and refactoring a core banking platform. Core stack: Python, APIs, cloud services, CI/CD; hybrid model with office days in London and up to two remote days per week.

API CI/CD Cloud Python