Principal Software Engineer (Payments)

Job description

An international cross-border payments company are looking for a Principal Software Engineer to help build and scale their payment platform. You’ll work across the full stack - frontend, backend, cloud infrastructure, and data - designing reliable systems that power real financial transactions.

You'll lead their latest platform, provide technical expertise at both the architectural and hands-on development levels, and mentor junior team members.

What You’ll Do:

• Design and build scalable payment applications and APIs
• Develop modern frontend interfaces and backend services
• Integrate with payment providers and financial systems
• Optimise database performance and system reliability
• Contribute to architecture decisions and technical strategy
• Support CI/CD pipelines and cloud infrastructure
• Mentor developers and promote engineering best practices

Tech Stack:

• Frontend: TypeScript, JavaScript, (React/Angular), HTML5, CSS3
• Backend: Python
• REST APIs
• Data: MySQL, PostgreSQL, Redis
• Cloud & DevOps: AWS, Docker, CI/CD, Kubernetes (nice to have)
• Architecture: API design, OAuth/JWT authentication, queues, webhooks, payment integrations
• Previous experience in Financial Services

What We’re Looking For:

• Strong system design and API architecture skills
• Experience building high-performance, scalable applications
• Comfortable working across frontend, backend, and cloud environments

For more details, apply now!

Extra information

Status

Open

Education Level

Secondary School

Location

City of London

Type of Contract

Full-time jobs

Published at

22-04-2026

Profession type

Accountancy

Full UK/EU driving license preferred

No

Car Preferred

No

Must be eligible to work in the EU

No

Cover Letter Required

No

Languages

English