Senior Full Stack Developer (React & Node.js)

🧩 About the Company

Our client is a rapidly growing US-based technology firm with global operations. With a strong commitment to innovation and quality engineering, the company is building a new engineering hub in Warsaw. This is your opportunity to join a high-performing team and play a pivotal role in developing next-generation digital solutions for the private capital markets.

📍 Location & Setup

Start remotely and transition to a hybrid model based in Warsaw (3 days/week in the office in the coming months).

🧠 The Role: Senior Full Stack Developer (React & Node.js)

We’re looking for an expert-level Senior Full Stack Developer with at least 7 years of professional experience in designing, architecting, and delivering high-performance web applications. You will take ownership of complex technical challenges across both the front-end and back-end, drive architectural decisions, and provide technical leadership and mentorship within the software development lifecycle.

🔧 Key Responsibilities

• Technical Leadership: Architect and develop scalable, responsive UIs with React.js, Redux, and modern JavaScript (ES6+).

• System Design: Design, build, and scale advanced server-side applications, microservices architecture, and RESTful/GraphQL APIs with Node.js and Express.

• Data Architecture: Lead database design, optimization, and integration strategies (PostgreSQL, MySQL, or MongoDB).

• Quality Assurance: Define testing strategies, write robust unit/integration tests, and establish efficient debugging protocols for the team.

• DevOps & Deployment: Oversee and optimize CI/CD pipelines, containerization using Docker, and cloud deployments.

• Agile Mentorship: Lead agile collaboration with product managers, designers, and engineers, while mentoring mid-level and junior developers.

• Performance: Proactively monitor system performance, identify bottlenecks, and maintain high-availability production-grade applications.

• Standards: Establish and maintain comprehensive technical documentation and coding standards.

📌 What We’re Looking For

Front-End:

• Expert-level experience with React.js, Hooks, Redux, and complex component-based architecture.

• Deep mastery of HTML5, CSS3, and ES6+.

• Advanced configuration and optimization experience with build tools like Webpack, Babel, or Vite.

Back-End:

• Senior-level proficiency in Node.js & Express.js for enterprise applications.

• Extensive API design and architecture experience (GraphQL highly preferred, alongside REST).

• Deep understanding and implementation experience with advanced security and authentication protocols: OAuth, JWT, sessions, and RBAC.

Databases & DevOps:

• Proven experience in scaling and optimizing relational and non-relational databases (PostgreSQL, MySQL, or MongoDB).

• Solid hands-on experience with Docker; Kubernetes experience is highly advantageous.

• Demonstrated experience designing and deploying applications on cloud platforms (AWS, Azure, or GCP).

• Advanced proficiency with Git workflows and driving Agile/Scrum methodologies.

🎓 Qualifications

• Bachelor’s or Master’s in Computer Science or a related field.

• 7+ years of hands-on experience in full stack development.

• 2+ years of experience in a senior or technical lead capacity.

• Proven track record of architecting, deploying, and maintaining high-traffic production applications.

💡 Soft Skills

• Strategic, analytical thinker and highly effective problem-solver.

• Strong technical leadership, team collaboration, and cross-functional communication skills.

• Self-motivated with excellent time management and the ability to drive projects autonomously.

• Passion for continuous learning, adopting new technologies, and sharing knowledge with the team.

🎁 What’s Offered

• Competitive salary up to $6,200 USD/month.

• Hybrid remote role with 3 days form office in the heart of Warsaw

• Generous Paid Time Off (PTO).

• Comprehensive full benefits package.

• The unique chance to shape the technical foundation of a new engineering hub and lead high-impact projects.

• A supportive, innovation-driven work environment that values technical excellence.