Location: Warsaw, Poland (Hybrid — 2–3 days/week in the office)
Employment: Full-time, B2B contract
Language: English

About the Company

The hiring company is an independent product-based SaaS organization with a portfolio of 10+ in-house B2C digital products. The company builds and scales its own products - no outsourcing, no external clients, and no investor pressure. The engineering function operates in a hybrid model in Warsaw, where collaboration 2–3 days per week in the office is required.

About the Role

The company is seeking a Senior SDE Fullstack who will take full hands-on ownership of backend and frontend feature development, contribute to architecture decisions, ensure performance, and maintain code quality across a modern SaaS environment.

This is a senior individual contributor role, fully hands-on - without people-management responsibilities.

What You’ll Do

Hands-On Engineering (Backend & Frontend)

• Build and deliver complex features end-to-end using Node.js, NestJS, React.js, Next.js, TypeScript.

• Design and implement scalable backend services and secure REST APIs.

• Develop performant frontend components, SSR flows, routing, and state management.

• Write clean, maintainable, well-tested code.

• Participate in architectural discussions within the product team.
  
  

Performance, Reliability & Observability

• Implement and refine logging, monitoring, and alerting (Sentry, Datadog, Groundcover).

• Troubleshoot and optimize backend and frontend performance.

• Participate in incident resolution and root-cause analysis.

• Improve system reliability, traceability, and error visibility.
  
  

CI/CD, Git & DevOps Collaboration

• Maintain and enhance CI/CD pipelines (including GitHub Actions).

• Work with DevOps to ensure consistent and stable environments across dev/staging/production.

• Manage and contribute to Git branching strategies (Git Flow or Trunk-Based Development).

• Ensure smooth, efficient, predictable deployment workflows.
  
  

Tech Stack Requirements

Must-Have

• 5+ years of professional full-stack engineering experience

• Strong production experience with:

  • Node.js, NestJS

  • React.js, Next.js

  • TypeScript

• Solid PostgreSQL knowledge (data modeling, optimization, indexing)

• Strong experience with AWS services (Lambda, S3, CloudWatch, SNS/SQS or equivalents)

• Experience building secure REST APIs (JWT auth, security best practices)

• Understanding scalable architectures and distributed systems basics

• Hands-on experience with CI/CD pipelines and GitHub Actions

• Docker experience

• Experience managing Git branching strategies (Git Flow / Trunk-Based Development)

• Ability to work hybrid in Warsaw (2–3 days/week in the office)
  
  

Nice-to-Have (Strong Plus)

• Kubernetes (K8s)

• ArgoCD or GitOps workflows

• Event-driven systems (Kafka, RabbitMQ, AWS SNS/SQS)

• Infrastructure as Code (Terraform)

• Observability tooling (Sentry, Datadog, Groundcover)

• Experience with design systems / Storybook

• Experience with internal utilities or shared packages

• Experience with test automation frameworks (Playwright or similar)
  
  

Key Performance Indicators (KPIs)

• Reliable end-to-end feature delivery

• Architecture clarity and maintainability

• Production stability & incident resolution speed

• CI/CD stability and deployment quality

• Code quality, documentation, and testing discipline
  
  

What the Company Offers

• Competitive compensation

• 22 paid vacation days + national holidays

• Annual learning & development budget (courses, certifications, conferences)

• Opportunity to contribute to a fast-growing multi-product SaaS environment

• Modern technology stack with minimal legacy

• Hybrid work model with a Warsaw-based office

• Senior, autonomous engineering culture focused on product impact
  
  

Interview Process

1. External recruiter call (30 min) – introduction, expectations

2. Recruiter Interview (prescreen, scorecard, expectations)

3. Technical Interview with Thomas Goik

4. SDE Challenge

   • 1-day test assignment

   • Must be submitted within 5 days

5. Second Technical Interview with Ionel & Dima

6. HR Interview (Professional skills, ways of working, cultural philosophy)