Senior Fullstack ( + )

Location: Warsaw Poland (Hybrid 23 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 23 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 Youll Do

Hands-On Engineering (Backend & Frontend)

• Build and deliver complex features end-to-end using NestJS 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:

  • NestJS

  • 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 (23 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)