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.