Principal Full Stack Engineer

Principal Full Stack Engineer (Contract)

Location: UK Hybrid (London / Remote)

Duration: 4–8 Months+

Level: Principal Engineer

About the Role

We are looking for a Principal Full Stack Engineer to lead the design and delivery of a cloud-native SaaS platform within the financial services sector. This is a hands-on technical leadership role, combining architecture, development, and team mentorship across a modern TypeScript/React and Golang technology stack.

Key Responsibilities

• Lead architecture and development across React/TypeScript front end and Golang backend services.
• Define API, application, and microservices design standards.
• Drive engineering best practices, code quality, testing, and CI/CD.
• Mentor engineers and provide technical leadership across the delivery team.
• Collaborate with product, architecture, cloud, and data teams to deliver scalable solutions.

Required Experience

• Strong commercial experience with TypeScript, React, and Golang.
• Proven track record delivering cloud-native SaaS platforms.
• Experience with microservices, APIs, CI/CD, and modern engineering practices.
• Previous technical leadership and mentoring experience.
• Background in financial services, payments, banking, or regulated environments is advantageous.

Desirable

• gRPC or GraphQL
• AI/ML integration experience
• Event-driven architectures
• Regulatory or compliance-focused delivery