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

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

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• Strong Python development experience building REST APIs and distributed microservices.
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• Experience delivering B2B SaaS products, including single-tenant and multi-tenant architectures.
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• Hands-on experience with AWS services including Cognito, Lambda, Fargate, API Gateway, S3 and IAM.
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• Experience using Terraform or other Infrastructure as Code tooling.
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• Strong PostgreSQL knowledge, including database design and query optimisation.
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• Experience using AI-assisted development tools such as GitHub Copilot, Claude, Cursor or similar.
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• Comfortable owning features from design through to deployment.
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• Strong communication skills with the ability to collaborate effectively across engineering and product teams.
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• Passion for writing high-quality, maintainable software and continuously improving engineering standards.
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• Experience mentoring or supporting other engineers through collaboration and code reviews.
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Desirable Skills

Experience in any of the following would be advantageous:

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• TypeScript and modern Front End development.
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• Financial services, capital markets or FinTech.
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• Additional AWS services such as SQS, SNS, Step Functions, EventBridge or Secrets Manager.
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• Big data technologies including DuckDB, pandas, Spark, Databricks or Snowflake.
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• AI/ML technologies including vector databases, semantic search or LLM orchestration frameworks.
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• Continuous delivery and modern development workflows.
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• Data science applications or financial data visualisation.
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What We Offer

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• The opportunity to work on technically challenging, large-scale SaaS products.
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• A collaborative and supportive engineering culture where knowledge sharing is encouraged.
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• Hybrid working with regular time together in our London office.
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• Weekly team lunches and regular social events.
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• Exposure to modern cloud technologies and AI-assisted engineering practices.
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• The chance to influence technical direction and help shape the future of a growing platform.
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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.