PTBOX | Full Stack Developer

About the Position

On behalf of PTBOX, SD Solutions is looking for a talented Full Stack Developer to join our team in Warsaw, Poland.

Responsibilities

• Develop robust backend services using Kotlin (Spring Boot / Ktor) and build modern frontends with React + TypeScript.
• Design and implement REST APIs and real-time communication layers (WebSocket / SSE).
• Containerize and orchestrate applications using Docker and docker-compose, including advanced patterns like Docker-in-Docker and sidecar containers.
• Design and optimize PostgreSQL databases with a focus on performance and scalability.
• Ensure high security standards (input validation, rate limiting, secure resource management).
• Take full ownership of features - from requirements gathering to production deployment.
• Write clear technical documentation and justify architectural decisions.
• Work independently in a fast-paced environment while maintaining high code quality.

Requirements

• 3–5+ years of professional experience
• Strong Kotlin/JVM backend skills; ability to architect services independently
• Solid React/TypeScript frontend skills
• Hands-on Docker experience in production (orchestration and programmatic management)
• Experience with REST API design and real-time communication (WebSocket/SSE)
• Database design and query optimization
• Security awareness (input validation, rate limiting, resource management)
• Ability to write technical documentation and explain architecture decisions
• Independent worker capable of taking tasks from requirement to production

We Offer

• Full-time position
• Competitive salary
• Opportunity to work with cutting-edge technologies

About the Company

PTBOX offers security leaders a comprehensive platform to continuously assess, validate, and enhance their security defences. By simulating tailor-made attack scenarios based on real-world threats, PTBOX enables teams to evaluate their readiness and response capabilities. With automated features, PTBOX streamlines the testing process, allowing for repeated assessments until threats are addressed. By proactively testing under various conditions, businesses can identify and mitigate vulnerabilities, ensuring effective and swift responses to potential attacks.

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