Senior​/Mid Frontend Engineer - React

Sensor Tower’s digital intelligence platform provides unparalleled insight into market trends, advertising, competitor strategies, and consumer/user audience across mobile, web, and gaming. Sensor Tower’s insights are trusted by more than 2,500 enterprises worldwide across tech, retail/commerce, entertainment/media, gaming, consumer packaged goods, finance, and investment.

Would you enjoy the fast‑paced excitement of a startup mindset? Are you interested in architecting high‑visibility, rapid‑release products? Do you value mentoring talented engineers and driving technical excellence? Join us in our journey to change how the world gains insights in digital marketing!

As a Senior Frontend Engineer at Sensor Tower, you will not only build features, you will define how we build them. You will take ownership of major technical components, ensuring our applications are scalable, maintainable, and fast. In our lean and flat organization, your voice will shape the technical direction of our product, helping us deliver an intuitive, fluid user experience that helps our customers understand the digital ecosystem.

• Architect and deliver complex, scalable frontend systems that are simple and effective, removing unnecessary complexity from our codebase.
• Partner with Product Managers to co‑author requirements and shape the scope, ensuring engineering feasibility is considered during ideation, not just execution.
• Lead technical decision‑making for medium‑to‑large scoped features, taking responsibility for the successful delivery of value to the customer, not just the completion of tickets.
• Mentor junior and mid‑level engineers through code reviews, pair programming, and by instilling quality‑first habits across the team.
• Take ownership of the frontend stack by proactively identifying bottlenecks, technical debt, or systemic issues and driving the initiatives to fix them.
• Advocate for and drive best practices in React, Type Script, and web performance optimization across the engineering organization.
• Collaborate deeply with Data Science and Backend Engineers to ensure seamless data flow and end‑to‑end system reliability, and use these partnerships to progressively expand your expertise across the full stack.

• Software engineering experience with a deep specialization in modern JavaScript, Type Script, and React.
• Proven ability to architect complex state management. While our stack relies on Tan Stack Query and Zustand, we value engineers who understand the principles and can adapt expertise from other libraries like Redux or MobX.
• Design systems that handle complexity without becoming complicated, prioritizing long‑term maintainability.
• Experience elevating the skills of peers. You don't just review their code; you teach patterns and best practices.
• Competence in writing robust and efficient unit and integration tests using frameworks like Jest, Cypress, or Playwright.
• Deep understanding of web performance, browser internals, and optimization techniques for data‑heavy applications.
• A product‑owner mindset. You care deeply about the “why” behind every feature, viewing code as a tool to solve real user problems. You are comfortable pushing back on requirements and proposing alternative solutions that drive better business outcomes and user experiences.

• Experience in data visualization and analytics (handling large datasets, heavy DOM manipulation).
• A portfolio, Git Hub history, or technical writing that demonstrates clean code, an eye for design, and the ability to solve complex architectural challenges.
• Familiarity with Ruby on Rails framework and No
  
  SQL/Columnar databases (MongoDB, Clickhouse).