Principal Software Engineer (Node.js, Java, Python)

StellarsTech is scaling and looking for a Principal Software Engineer to lead backend development on fast-growing projects for the US market. This role focuses on Node.js while offering opportunities to work with Java and Python systems.

What You’lll Be Doing:

Principal-level responsibilities:

• Define long-term architecture and ensure consistency of technical decisions across the product.
• Lead critical engineering initiatives focused on reliability, scalability, and system design.
• Mentor engineers and guide them through complex tasks and architectural decisions.
• Collaborate with PMs, BAs, and stakeholders to align technical solutions with business needs.
• Conduct deep technical reviews and maintain high engineering standards.

Hands-on responsibilities:

• Develop and maintain backend APIs using Node.js, Express, and databases (PostgreSQL, MongoDB).
• Implement interactive and responsive components using React when needed.
• Work closely with design and QA teams on feature delivery.
• Optimize application performance, reliability, and security.
• Write clean, maintainable, and well-tested code following modern development practices.

Who You Are:

• 6+ years of professional experience with Node.js and React.
• Strong knowledge of JavaScript/TypeScript, backend architecture, and REST APIs.
• Experience designing distributed or high-load systems — a strong advantage.
• Openness to work with Java and/or Python when needed.
• Familiarity with Git and collaborative workflows.
• English: Upper-Intermediate+.
• Availability to work until 12:00–1:00 a.m. Kyiv time.

Project: we are considering your potential involvement in two different projects: 1) a portfolio of projects in domains such as insurance, billing systems, and related areas; 2) an Edtech product.

Our Hiring Process:

• Intro Interview — appr. 30 min;
• Technical Interview — 60 min;
• Interview with CEO/PM — 60 min;
• Project Interview — up to 60 min (optional).