Mid/Senior Frontend Developer
Sensor Tower3 months ago
Warsaw, PolandMid Level / Senior
Responsibilities
- Architect and deliver complex, scalable frontend systems that are simple, maintainable, and effective.
- Partner with Product Managers to define requirements and scope features with engineering feasibility in mind.
- Lead technical decisions and delivery for medium-to-large scoped features.
- Mentor junior and mid-level engineers through code reviews, pair programming, and teaching best practices.
- Own the frontend stack by identifying and resolving bottlenecks, technical debt, and systemic issues.
- Drive best practices in React, TypeScript, and web performance optimization.
- Collaborate with Data Science and Backend Engineers to support seamless data flow and end-to-end reliability.
Requirements
- 4+ years of software engineering experience with deep specialization in modern JavaScript, TypeScript, and React.
- Experience architecting complex state management systems and adapting expertise across state-management libraries.
- Ability to design systems that manage complexity while remaining maintainable.
- Experience elevating peers through code reviews, teaching, and communication of engineering patterns.
- Competence writing robust unit and integration tests with tools such as Jest or Playwright.
- Deep understanding of web performance, browser internals, and optimization for data-heavy applications.
- Product-oriented mindset with the ability to challenge requirements and propose solutions that improve user and business outcomes.
- Experience with data visualization, analytics, large datasets, or Highcharts is a plus.
- A portfolio, GitHub history, or technical writing demonstrating clean code, design judgment, and architectural problem-solving is a plus.
- Familiarity with Ruby on Rails, Angular, ClickHouse, MongoDB, or PostgreSQL is a plus.
- Knowledge of AI-driven coding tools and models is a plus.
Benefits
- Flexible work environment supporting employees across global teams and time zones.
- Global presence with regional offices in San Francisco, Los Angeles, New York, London, Singapore, Beijing, Seoul, Tokyo, and Vancouver.
- Equal employment opportunity and reasonable accommodation support.
Tech Stack
Categories
About Sensor Tower
Sensor Tower provides a digital intelligence platform that tracks market trends, app performance, web traffic, and advertising across mobile, web, and gaming for brands, publishers, and investors. It sells subscription SaaS products spanning App Intelligence, Audience & Web insights, and Digital Advertising Insights (formerly Pathmatics). Founded in 2013 and headquartered in San Francisco, its datasets are used by more than 2,500 enterprises across sectors to benchmark competitors and guide growth and investment decisions.