This role supports eTrading platforms using Windows/Linux, Bash, PowerShell, Python,

You’ll develop components for a research and trading platform used by quant researchers and portfolio managers, working in Python and relational databases with optional AWS/GCP, CI/CD, and containerized environments. The team builds scalable backtesting tools, data pipelines, and production-grade research infrastructure. This is a Python developer role; no team size is stated.

You will develop predictive signals and systematic HFT and market-making strategies using order book dynamics, trade flow, and large datasets with Python. The proprietary firm trades its own capital in high-frequency cryptocurrency markets. You will own the complete research lifecycle, from hypothesis through live production and performance optimisation.

Work with Python, PyTorch, TensorFlow, Scikit-learn, XGBoost, AWS (SageMaker, Lambda, S3), MLflow, LangChain and other MLOps/LLMOps frameworks to build and deploy ML and generative AI solutions. You will design production-ready models for forecasting, classification, and anomaly detection, as well as LLM-powered applications, supporting defence, government, and national security clients as part of a technology consultancy.

This Full Stack Engineering Lead role at Citi’s Finance Technology team involves hands-on development with Java, Spring Boot, Spring Cloud, React, TypeScript, Node.js, and microservices. The team is re-platforming applications to support the Finance business, focusing on building scalable solutions for regulatory and operational needs. Testing practices use Jest, Cypress, JUnit, and Mockito, with AWS or GCP experience as a plus.

React Native developer will work with JavaScript/TypeScript, APIs, and CI/CD to build and optimise mobile apps for iOS and Android. The role is with a FinTech undergoing a digital transformation programme, modernising core mobile products and improving user journeys.

Senior Software Engineer for pricing and availability systems on a global travel and e-commerce platform, using TypeScript, Node.js, C#/.NET or Python, and SQL. Work involves building pricing, quote-caching and availability services, resilient APIs, and improving performance and observability with tools like Datadog and Terraform.

The traineeship covers Linux, shell scripting, Git, Docker, CI/CD, Infrastructure as Code, and cloud platforms like AWS, Azure, and Google Cloud. You will build practical projects such as CI/CD pipelines, cloud deployments, and container management. This is a training programme for candidates with no prior DevOps experience.

Senior Kotlin backend role with full-stack exposure to Angular/React, Spring AI, reactive streams, and event-driven tools like Kafka or RabbitMQ. You'll build a data integration platform for banks, an open-source schema language, and a greenfield AI agent for autonomous orchestration.

You will work with SQL, Python, DBT, Fivetran, Airflow, Snowflake, Git, and cloud platforms (AWS, Azure, or GCP). The role designs, builds, and maintains scalable data platforms and pipelines that power analytics, reporting, and data-driven decision-making. No team size is stated.

Work with React, TypeScript, and REST API integration to build analyst-facing interfaces on a next-generation Defence Intelligence platform. The role supports a major AI-enabled Defence programme, improving operational decision-making for mission-critical users.

You'll work with TypeScript, Node.js, Go, AWS, PostgreSQL, and event-driven architecture, building AI infrastructure including vector stores and LLM orchestration. Fanvue is a Series A AI-powered creator platform connecting millions of fans with creators. This role leads the platform's monolith-to-services decomposition and AI infrastructure evolution.

Work with Python, AWS, and Kubernetes to build and maintain custom integrations, API fixes, and SDKs for a voice AI startup. You will support the Forward Deployed Engineering team, managing one-off integrations, platform fixes, and custom builds for enterprise clients deploying large-scale voice infrastructure.

Build features across a Svelte/TypeScript front end and Python back end using FastAPI, Django, PostgreSQL, and AWS. Tab is a YC-backed London travel fintech processing thousands of real-time payments per hour for over 100,000 global tourism businesses in 100+ currencies.

Use Python (FastAPI/Django) and Svelte with TypeScript to build and scale a payments platform processing 100 currencies and a discovery engine listing 100,000+ tourism businesses. Work on AWS cloud infrastructure and real-time transaction processing as part of a profitable, lean team of nine.

Build a comprehensive platform for 1,500+ charities using TypeScript, React, and Node.js. You will architect features like grant management, AI impact reporting, and safeguarding tools, and build migration tools for charities. Work in a high-autonomy team of 15.

Work with Python or Node on backend distributed systems and serverless architectures on AWS, with a smart contract language such as Solidity. The company builds services to accept card payments and grow businesses globally. No team scope is specified.

You will work with AWS and Microsoft cloud and data technologies as a Junior Data Engineer. Colibri Digital, a cloud consultancy and Select AWS partner with Microsoft Gold competency, delivers cloud and data solutions for clients. The role involves collaborating with experienced consultants on evolving cloud and data technologies.

You will work with cloud platforms (AWS or Azure), automation tools, and CI/CD pipelines for a disruptive digital security company’s UK-first PKI project.

AWS (EC2, Lambda), Terraform/Infrastructure as Code, Kubernetes, Docker, and GitHub Actions CI/CD pipelines. The DevOps Engineer will build and manage cloud infrastructure and deployment workflows for the company's platform. The role does not specify team size or project details.

You will work with data preprocessing techniques, data pipelines, and cloud platforms (AWS, GCP, Azure) along with MLOps practices. This graduate role is for Tech Recruitment UK Ltd, a recruitment firm that places candidates in AI/ML positions. No specific team or product details are listed.

Work with AWS services and Databricks to build data pipelines for advanced analytics and machine learning models, collaborating closely with a data science team at a data- and analytics-focused London firm.

Harvey Nash★3.8 (49)· London

You will build enterprise-scale applications using Java, Spring Boot, microservices, and front-end technologies (likely React or Angular), with exposure to AI tools and modern DevOps practices. You will join a high-performing engineering team at Harvey Nash, developing large-scale software solutions in a hybrid London-based setting.

Senior Java Full Stack Developer building large-scale enterprise applications for a global financial services firm. You will work with Java and embrace AI-powered development on modern software engineering projects.