Senior Fullstack (Node.js + React.js)

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)