Principal Full Stack Engineer

Principal Full Stack Engineer

Posted 2 weeks ago by BrightBox Group

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Negotiable
Undetermined
Hybrid
London Area, United Kingdom
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Application Programming Interface (API) Banking Cloud Computing Cloud Technology Continuous Integration and Continuous Delivery Financial Services Front End (Software Engineering) Full Stack Development Go (Programming Language) golang GraphQL gRPC Microservices React.js Software as a Service (SaaS) TypeScript

Summary: The Principal Full Stack Engineer will lead the design and delivery of a cloud-native SaaS platform in the financial services sector. This role requires hands-on technical leadership, focusing on architecture, development, and team mentorship using a TypeScript/React and Golang technology stack. The position is hybrid, allowing for both on-site and remote work. The contract duration is expected to be between 4 to 8 months or longer.

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.

Key Skills:

  • 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.

Salary (Rate): undetermined

City: London

Country: United Kingdom

Working Arrangements: hybrid

IR35 Status: undetermined

Seniority Level: undetermined

Industry: IT

Detailed Description From Employer:

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
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