Principal Full-Stack Engineer (Frontend focus)

Sigma Software

1d•Remote

About The Position

We are looking for a Principal Full-Stack Engineer with a frontend focus to join our Software Development Team. This is a full-time remote opportunity based in Warsaw, Poland, with flexibility to work from anywhere. At Sigma Software, we partner with global innovators to deliver high-performance solutions across industries. In this role, you will architect, build, and optimize a next-generation analytics dashboard for a large-scale distributed data platform, enabling customers to uncover meaningful patterns and insights. The project focuses on designing, developing, and maintaining a next-generation analytics dashboard for a large-scale distributed data platform. This dashboard enables customers to explore and analyze their data, uncover meaningful patterns, and identify potential issues. The role involves technical leadership, architecture design, and mentoring, as well as hands-on development using modern JavaScript frameworks and APIs.

Requirements

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

Nice To Haves

Experience with large-scale distributed systems
Background in analytics platforms and ETL workflows
Knowledge of security best practices for web applications

Responsibilities

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