Senior Frontend Engineer: Lead Scalable React UIs

Sensor Tower; Warszawa; On-site; PLN 183,553 - 256,974; Full time

Job summary

Sensor Tower is seeking a Frontend Engineer to build and define features that enhance user experience. In this role, you will take ownership of major technical components and lead the development of scalable applications, mentoring fellow engineers and driving best practices in React and TypeScript.

The ideal candidate will have over 4 years of experience, a deep understanding of state management, and a passion for creating intuitive user experiences. You'll collaborate with product managers, backend engineers, and data scientists to deliver robust solutions.

Qualifications

• 4+ years of software engineering experience with modern JavaScript, TypeScript, and React.
• Ability to architect complex state management systems.
• Experience in writing unit and integration tests using frameworks like Jest or Playwright.

Responsibilities

• Architect and deliver complex, scalable frontend systems.
• Lead technical decision-making for medium‑to‑large scoped features.
• Mentor junior and mid-level engineers through code reviews and pairing.

Skills

JavaScript

TypeScript

React

Web performance optimization

Unit and integration testing

Job description

Sensor Tower is seeking a Frontend Engineer to build and define features that enhance user experience. In this role, you will take ownership of major technical components and lead the development of scalable applications, mentoring fellow engineers and driving best practices in React and TypeScript.

The ideal candidate will have over 4 years of experience, a deep understanding of state management, and a passion for creating intuitive user experiences. You'll collaborate with product managers, backend engineers, and data scientists to deliver robust solutions.