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Senior Fullstack (Node.js + React.js) at OnHires. Remote Location: Remote Europe. Location:. Remote. 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.. 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). 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. Senior, autonomous engineering culture focused on product impact. Interview Process. External recruiter call (30 min) – introduction, expectations. Recruiter Interview (prescreen, scorecard, expectations). Technical Interview . SDE Challenge. 1-day test assignment. Must be submitted within 5 days. Second Technical Interview . HR Interview (Professional skills, ways of working, cultural philosophy)