Volition
Senior Full Stack Engineer (£90,000-£120,000) - FinTech - Hybrid
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Senior Full Stack Engineer – FinTech - Hybrid (1-2 days in London office)
About the Role
We’re looking for a Senior Full Stack Engineer to help build and evolve a modern FinTech platform. This is a hands-on engineering role where you’ll design, build and operate distributed systems that process complex financial data at scale.
You’ll work across the full technology stack, integrating with third-party platforms, cloud services and open-source technologies to deliver resilient, secure and scalable software. Working on a hybrid basis, you’ll collaborate closely with engineering, product and other teams while taking significant ownership of technical design and delivery.
What You’ll Do
- Design, build and maintain distributed web applications and backend services.
- Develop features across frontend, backend, APIs and infrastructure.
- Integrate with third-party vendor platforms, financial systems and open-source technologies.
- Design scalable APIs and data models.
- Build and operate cloud-native services on AWS and Kubernetes.
- Drive software quality through testing, observability and operational excellence.
- Contribute to architectural decisions while remaining actively involved in implementation.
- Review code, mentor engineers and help raise engineering standards.
- Troubleshoot production issues and improve system reliability and performance.
- Work closely with engineering and product teams to deliver high-quality solutions.
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Skills & Experience
Essential
- Significant commercial experience building modern web and backend applications.
- Strong experience with:
- Next.js
- TypeScript / Node.js
- PostgreSQL
- AWS
- Kubernetes
- Experience designing and operating distributed systems.
- Experience integrating with third-party APIs, commercial SaaS products and open-source technologies.
- Strong understanding of REST APIs, authentication and application security.
- Experience with CI/CD and modern software delivery practices.
- Experience using AI-assisted software development tools.
Desirable
- Experience working within FinTech, financial services, capital markets or another regulated industry.
- Experience building platforms that process complex or high-volume financial data.
- Experience with event-driven architectures.
- Experience with Infrastructure as Code.
- Experience working with highly available, secure and scalable systems.
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What We’re Looking For
- Designs scalable, maintainable systems and makes sound architectural decisions.
- Takes ownership from design through to production, with a strong operational mindset.
- Is comfortable working across multiple languages, frameworks and technology stacks.
- Quickly understands unfamiliar codebases and third-party systems.
- Makes pragmatic engineering decisions that balance quality, speed and long-term maintainability.
- Builds secure, reliable software by default.
- Writes clean, well-tested and maintainable code.
- Enjoys solving complex technical problems.
- Communicates effectively and collaborates well across engineering and product teams.
- Is comfortable working within a collaborative hybrid environment.
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