SENIOR SOFTWARE ENGINEER - PYTHON, AWS & REACT

Senior Software Engineer (Python/AWS) - SaaS & FinTech

Location: London (Hybrid)

Type: Full-time

The Opportunity

We're looking for an experienced Senior Software Engineer to join a collaborative, high-performing engineering team developing market-leading SaaS products used to analyse and visualise some of the world's largest financial datasets.

This is an opportunity to work on cutting-edge cloud technology, solve complex engineering challenges and help shape the future of a modern SaaS platform. You'll work alongside talented Python and TypeScript engineers, partnering closely with Product to design and deliver scalable, high-quality software that makes a real impact.

If you're passionate about building cloud-native applications, embracing AI-assisted development tools and working in a collaborative environment where your ideas are valued, we'd love to hear from you.

What You'll Be Doing

Design, develop and enhance scalable, secure microservices for enterprise SaaS applications.

Build and evolve cloud-native solutions across both single-tenant and multi-tenant architectures.

Collaborate closely with Product to translate complex business requirements into robust technical solutions.

Leverage AI engineering tools, coding assistants and automated workflows to improve productivity and code quality.

Contribute to AWS cloud infrastructure, monitoring and operational excellence using services including CloudWatch.

Write clean, maintainable, well-tested code and contribute to CI/CD best practices.

Participate in architecture discussions and influence technical decisions.

Mentor and support junior engineers through code reviews, knowledge sharing and technical guidance.

What We're Looking For

You'll have strong commercial experience developing cloud-native SaaS applications and enjoy working in a collaborative, fast-paced environment.

Essential Skills & Experience

Strong Python development experience building REST APIs and distributed microservices.

Experience delivering B2B SaaS products, including single-tenant and multi-tenant architectures.

Hands-on experience with AWS services including Cognito, Lambda, Fargate, API Gateway, S3 and IAM.

Experience using Terraform or other Infrastructure as Code tooling.

Strong PostgreSQL knowledge, including database design and query optimisation.

Experience using AI-assisted development tools such as GitHub Copilot, Claude, Cursor or similar.

Comfortable owning features from design through to deployment.

Strong communication skills with the ability to collaborate effectively across engineering and product teams.

Passion for writing high-quality, maintainable software and continuously improving engineering standards.

Experience mentoring or supporting other engineers through collaboration and code reviews.

Desirable Skills

Experience in any of the following would be advantageous

TypeScript and modern Front End development.

Financial services, capital markets or FinTech.

Additional AWS services such as SQS, SNS, Step Functions, EventBridge or Secrets Manager.

Big data technologies including DuckDB, pandas, Spark, Databricks or Snowflake.

AI/ML technologies including vector databases, semantic search or LLM orchestration frameworks.

Continuous delivery and modern development workflows.

Data science applications or financial data visualisation.

What We Offer

The opportunity to work on technically challenging, large-scale SaaS products.

A collaborative and supportive engineering culture where knowledge sharing is encouraged.

Hybrid working with regular time together in our London office.

Weekly team lunches and regular social events.

Exposure to modern cloud technologies and AI-assisted engineering practices.

The chance to influence technical direction and help shape the future of a growing platform.

If you're an experienced software engineer looking to tackle complex technical challenges, work with modern technologies and be part of a collaborative engineering team, please contact Ben Turner at BRT Consulting.