Principal Software Engineer (Individual Contributor)
6-Month Contract | Fully Remote (UK) | Up to €300/day | ASAP Start
The Company
UK-based fintech platform backed by major retail brands, operating in the Buy Now Pay Later / pay-later space (Klarna-style alternative). The platform is scaling and investing in strengthening its microservices architecture and cloud infrastructure.
The Role
We are seeking a Senior-level Engineer to work on complex technical delivery across Node.js microservices and AWS cloud infrastructure.
This is a hands-on technical role with no line management responsibilities. You will operate at Principal level in terms of ownership, architectural input, and production impact, while remaining embedded in the code.
Key Responsibilities
* Build scalable API-driven microservices (Node.js / TypeScript)
* Lead complex technical design decisions and architectural trade-offs
* Contribute to and uphold engineering standards and best practices
* Own code quality, testing strategy, and CI/CD processes
* Support and coordinate production deployments
* Provide third-line support and complex incident resolution
* Contribute to technical roadmap and platform improvements
* Ensure secure coding practices and regulatory compliance
* RESTful APIs (JSON)
* AWS (Lambda, EC2, ECS/Fargate, RDS)
* Docker / containerisation
* Terraform (Infrastructure as Code)
* Git / GitLab
* Monitoring tools (Grafana, Kibana)
Experience Required
* Strong experience building and designing microservices in Node.js / TypeScript
* CI/CD and DevOps exposure (build, test, deploy pipelines)
* Experience with Infrastructure as Code (Terraform preferred)
* Strong understanding of API design and scalable distributed systems
* Comfortable operating at Principal IC level without direct people management
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