Senior Software Engineer - Python, AWS & React

About the role

We are seeking an experienced Senior Software Engineer to join our high‑performing engineering team in London. The role focuses on building cloud‑native SaaS products that analyse and visualise large financial datasets, leveraging Python, AWS and modern front‑end technologies.

Key responsibilities

• Design, develop and enhance scalable, secure microservices for enterprise SaaS applications.
• Build and evolve cloud‑native solutions across single‑tenant and multi‑tenant architectures.
• Collaborate closely with Product to translate complex business requirements into robust technical solutions.
• Leverage AI‑assisted development tools and automated workflows to improve productivity and code quality.
• Contribute to AWS infrastructure, monitoring and operational excellence using services such as CloudWatch.
• Write clean, maintainable, well‑tested code and champion CI/CD best practices.
• Participate in architecture discussions and influence technical decisions.
• Mentor junior engineers through code reviews and knowledge sharing.

Required profile

• Strong commercial experience developing cloud‑native SaaS applications in a fast‑paced, collaborative environment.
• Proven expertise in Python REST API development and distributed microservices.
• Experience delivering B2B SaaS products with both single‑tenant and multi‑tenant architectures.
• Hands‑on experience with core AWS services and Infrastructure as Code tooling.
• Solid knowledge of PostgreSQL design and query optimisation.
• Familiarity with AI‑assisted development tools such as GitHub Copilot, Claude or Cursor.
• Ability to own features from design through deployment and communicate effectively across teams.

Required skills

• Python
• TypeScript
• React
• AWS (Cognito, Lambda, Fargate, API Gateway, S3, IAM)
• Terraform
• PostgreSQL
• GitHub Copilot
• Claude
• Cursor
• CI/CD pipelines
• CloudWatch