Principal Full-Stack Engineer – Frontend Focus

Sigma Software Group

Lead the development of cutting-edge analytics dashboards as a Principal Full-Stack Engineer. Join Sigma Software's remote team based in Warsaw, Poland for international projects.

Posted 4/23/2026full-timeRemote • 🇵🇱 PolandLeadWebsite

Tech Stack

Tools & technologies

GraphQLJavaScriptNode.jsPythonReactSQLTypeScript

About the role

Key responsibilities & impact

Serve as the primary technical lead for dashboard development
Design and architect the next-generation dashboard platform
Lead post-mortems and coach team members on conducting thorough root cause analyses
Partner closely with Product and Research teams to align features with business needs
Profile, debug, optimize, and strengthen the security of web applications
Contribute to an agile development process and create clear documentation
Mentor junior engineers and support their professional growth
Collaborate with a high-caliber engineering team focused on learning, experimentation, and technical excellence
Foster a high-performance engineering culture emphasizing efficiency, collaboration, and quality

Requirements

What you’ll need

8+ years of relevant experience as a Full-Stack Developer
Proven experience building modern web applications with React, GraphQL, TypeScript, and Node.js
Experience creating reporting dashboards and working with data tools such as SQL, Looker, dbt, and Python
Strong frontend engineering expertise with deep understanding of UI architecture and common design pitfalls
Commitment to correctness, performance, and delivering clean, high-quality solutions
Ability to independently own large features from technical design to production deployment
Experience mentoring teammates through code reviews, design discussions, and hands-on support
Problem-solving mindset with curiosity and rigor, using experimentation to find innovative solutions
Familiarity with AI-assisted development tools for productivity and quality improvement
Upper-Intermediate English level

Benefits

Comp & perks

remote work flexibility
professional growth opportunities
chance to work on international projects

ATS Keywords

✓ Tailor your resume

Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills & Tools

Full-Stack DevelopmentReactGraphQLTypeScriptNode.jsSQLLookerdbtPythonUI Architecture

Soft Skills

MentoringProblem-solvingCollaborationCoachingTechnical LeadershipCuriosityRigorEfficiencyCommunicationCommitment to Quality