Senior Fullstack Developer

We are The Codest - International Tech Software Company with tech hubs in Poland delivering global IT solutions and projects. Our expertise centers on web development, cloud engineering, DevOps and quality. We have developed our own product, Yieldbird, honored as a laureate of the Top25 Deloitte awards. Our mission is to help tech companies build impactful products and scale their IT teams by boosting IT delivery performance.

Key Requirements:

• 5+ years building production web applications in any modern language (PHP, TypeScript/Node.js, Python or similar).
• Solid REST API design instincts: resources, idempotency, versioning, error contracts.
• Relational database fluency — schema design, query analysis, migrations.
• Disciplined testing — unit and integration; knowledge of what to mock.
• Git fluency: branching, pull requests, rebases, conflict resolution.
• Experience using AI coding assistants and agent-based workflows in real engineering work.
• Strong written English — code comments, PR descriptions, OpenAPI text.

Nice to have:

• PHP 8.x with Symfony and Doctrine ORM.
• Node.js / TypeScript with a mature backend framework (Nest, Fastify, Express + Zod, etc.).
• Multi-tenant SaaS architecture (row-level isolation, tenant-scoped queries).
• IPFS or other content-addressable storage concepts.
• JWT auth flows with refresh-token rotation.
• OWASP Top-10 awareness.

In this project, you will develop and enhance a secure, multi-tenant SaaS platform for managing sensitive HR and identity-related data, focusing on access control, auditability, and data governance.

Deliver end-to-end features across backend services and web applications, including:

• REST API development
• Business logic implementation
• Database design
• Frontend functionality
• Automated testing
• API documentation

Candidates must be entitled to work in the EU without a sponsored visa.