You will use React, front-end technologies, iOS/Android, Java with Spring Boot, REST APIs, Kafka, IBM MQ, and apply TDD and automated testing within Agile and DevOps practices. As part of a permanent feature team, you will design, produce, and test software for a platform, collaborating with engineers and stakeholders to support business objectives.

Smart Bricks is hiring a Head of Applied AI to build an Applied AI Lab that deploys AI solutions for large real estate organizations. You will work daily with enterprise customers, hiring and leading a team of Forward Deployed Engineers, AI Engineers, Solutions Architects, Applied AI Consultants, and Deployment Managers. The role spans AI/ML, software engineering, and product collaboration to convert customer work into platform capabilities.

You’ll build behavioral simulation services with Python, FastAPI, and TypeScript on GCP, owning systems from design to deployment. Electric Twin creates digital twins of populations to predict human behavior, used by organizations like The Times. You'll join a team of 17 shaping the product and engineering culture.

Lead Software Engineer role building autonomous and AI-driven systems for national security at a London defence AI start-up. Work involves Python, Java, C++, Rust, Go, TypeScript, and scalable distributed systems, with hands-on architecture and mentoring. The engineering team is small and high-calibre.

You'll architect scalable Node.js/TypeScript services, integrate LLMs, and work with microservices, event-driven architecture, PostgreSQL, message queues, and cloud infrastructure. The team builds Felicity, an AI

Altus Group★3.0 (197)· London

This hands-on Tech Lead role at Altus Group builds AWS-native platforms using Lambda, ECS, RDS, S3, SQS, API Gateway, CloudWatch, Terraform, and CI/CD pipelines, with Python, Java, or Node.js. The lead owns mission-critical services end-to-end, drives architecture, and mentors engineers while partnering

Build trading systems, market data infrastructure, and quantitative research platforms using C++, Python, and Java. The role is with a network of 40+ top trading firms, focusing on trading platforms, risk systems, and data infrastructure for high-frequency trading.

Design and build scalable Python backend services and AI products using LLMs, RAG, and agentic workflows, creating APIs and managing AWS infrastructure with CI/CD and containerization. You'll join a small, experienced engineering team at a company creating AI-powered products for major global organizations.

This role uses C++, Java, Oracle RDMS, REST APIs, cloud platforms (Azure, AWS, or GCP), Kubernetes/OpenShift, CI/CD tools, DevOps, and monitoring/observability tools. You will work on hospitality solutions such as Central Reservation Systems, Property Management Systems, and Payment systems/gateways.

You'll work across the stack building core systems from scratch using Python, C#, Go, or Java, with direct collaboration with founders on product and technical strategy. This role is at an early-stage cybersecurity start-up focused on transforming how organizations secure data and infrastructure.

You will work with TypeScript, React, Node.js, Python, and Google Cloud/AWS, building LLM-powered workflows, intelligent pipelines, and agentic systems. As the most senior individual contributor at Steven.com, you own the architecture of the company’s highest-stakes, complex systems for its creator-economy operating system. This founding-team role sets the technical bar for the whole engineering organization.

You'll work with TypeScript, React, Node.js, Python, JavaScript, SQL/NoSQL databases, and AI/ML tools including LLM-based APIs. Steven.com builds an operating system for the creator economy, and you'll ship end-to-end features across internal and external products.

You'll work with Python, SQL, Linux, Docker, and legacy systems, plus desirable tools like dbt, Snowflake, Kafka, AWS, and Java. You'll develop ELT pipelines, build a streaming platform for tick data, and consolidate legacy systems for Aspect Capital, a London-based systematic hedge fund. This is a lean team owning end-to-end delivery of data ingestion and transformation.

You'll work with TypeScript, Python, and/or Rust/C++, plus cloud infrastructure and SQL/no-SQL databases. Catapult builds personalised AI models that understand your work context across email, calendar, Slack, and more. The role includes building desktop apps end-to-end and algorithmic development.

You'll work with Python, NLP/LLMs, AI/ML, cloud infrastructure, SQL/no-SQL, and optionally C++/Rust. Catapult builds personalised AI models that understand your full work context across email, calendar, Slack, Notion, and Google Docs. As a founding engineer, you'll own retrieval and reasoning systems end-to-end from research to product.

You'll work with TypeScript, React, Next.js, Node.js, Express, and PostgreSQL. The team builds financial products for African businesses, including automated payouts, payment automation, and invoice processing. You'll join a small, high-performing team shaping the product vision and technical architecture.

You'll work with TypeScript, React, NextJS, PostgreSQL, and Claude Code (or similar AI agents) to build greenfield AI products using LLMs. These tools process and extract insights from international filings, regulatory documents, and research materials for investors.

Staff Full Stack Engineer at Capi, working with Typescript, React, NextJS, NodeJS, Express, and PostgreSQL. The role involves building and scaling a platform for African businesses, contributing end-to-end from UI to backend logic, and working closely with the founding team in London and Paris.

Build features using Java, Python, and MATLAB, integrating with proprietary trading systems and strategic SaaS providers while applying TDD, CI/CD, and monitoring. You will join the Software Development team at Aspect Capital, an award-winning systematic hedge fund managing over $8 billion in assets.

You'll work with Java 21, Spring Boot 3, event-driven microservices on AWS (EC2, RDS, SQS, SNS, SES, Cognito), PostgreSQL, Docker, and GitHub Actions CI/CD, using AI tools like Claude Code. Aslan builds the back-end systems that power payroll and payments for companies and their employees.

You'll use Go, gRPC, HTTP, Docker, and observability tools like Prometheus and Grafana on a modern containerised AWS stack with MySQL, DynamoDB, Redis, and Elasticsearch. The backend team designs, builds, and supports high-traffic APIs and internal tools for a community safety platform, processing tens of millions of analytic events daily with event-driven architecture and machine learning.

You will work with Python, TensorFlow or PyTorch, and large language models, building custom deep-learning models and training/fine-tuning LLMs on a proprietary dataset. Kangal AI builds frontier AI for governments, national security, and private corporations. As a founding hire, you will own the model stack and scale the research into a team you lead.

Use SQL, Python, and AI tools to extract and analyze large data sets on private markets and alternative investments. Work with Product and Machine Learning teams to develop data extraction from unstructured text like PDFs. The company automates alternative investment data processes for institutional investors.

Work with Python, PyTorch, Scikit-learn, Hugging Face, MLFlow, AzureML, and CI/CD/MLOps tools like Azure DevOps, Docker, and Kubernetes. The Applied AI team builds production LLM-powered systems, agentic AI, and ML pipelines for Glasswall’s cybersecurity solutions. No team size is stated.

You will work with SailPoint IdentityIQ, Java, Active Directory, Azure AD, LDAP, Workday, Fieldglass, SAML, OAuth, and SCIM. You will join AIG’s Identity and Access Management team, designing and maintaining enterprise IAM infrastructure for the global insurance company. No team size is stated.