Technical Architect / Principal Engineer
London (hybrid)
90k to 105k
We’re partnering with an ambitious London‑based payments start‑up looking to hire a hands‑on Technical Architect / Principal Engineer to help shape the next generation of their platform as they scale.
This is a high‑impact opportunity for a senior engineering leader who enjoys operating across architecture, platform engineering, product delivery, and technical strategy in a fast‑moving environment.
You’ll play a key role in defining engineering standards, influencing product direction and building scalable systems capable of supporting rapid growth within a modern payments ecosystem.
The Opportunity
Joining at an exciting stage of growth, you’ll work closely with founders, product teams and engineers to design and deliver a highly scalable payments platform using modern cloud‑native technologies.
This role combines:
- technical leadership
- and mentoring responsibilities
You’ll be expected to remain close to the code while driving best practice across the wider engineering function.
Key Responsibilities
- Define and evolve platform architecture across mobile, backend and cloud infrastructure
- Lead engineering design decisions and establish scalable development standards
- Build and optimise high‑performance backend services using Node.js
- Drive mobile architecture and delivery using React Native
- Own AWS infrastructure strategy, scalability, reliability and security
- Work closely with product and leadership teams to shape technical roadmap
- Champion engineering excellence, DevOps culture, CI/CD and automation
- Explore and implement modern AI‑assisted engineering tooling and workflows
Required Experience
We’re looking for a strong technical leader with experience building scalable products within start‑up or high‑growth environments.
- Strong experience with React Native
- Strong knowledge of AWS infrastructure and cloud‑native architecture
- Experience working with PostgreSQL and scalable data design
- Proven experience operating at Technical Architect, Principal Engineer or Staff Engineer level
- Experience building scalable distributed systems and APIs
- Strong understanding of modern software engineering best practices
- Payments, fintech or regulated environment experience
- Exposure to AI‑assisted development tooling such as Claude, GitHub Copilot, Cursor or similar
- DevOps and infrastructure‑as‑code experience
What’s on Offer
- Opportunity to shape architecture from an early stage
- High ownership and autonomy
- Fast‑growing fintech business with strong leadership backing
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