Senior/Mid Frontend Engineer - React

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.

Responsibilities

Architect and deliver complex, scalable frontend systems that are simple and effective; Partner with Product Managers to co-author requirements and shape scope; Lead technical decision-making for medium-to-large scoped features; Mentor junior and mid-level engineers through code reviews, pair programming, and quality-first habits; Take ownership of the frontend stack by identifying bottlenecks, technical debt, or systemic issues; Advocate for and drive best practices in React, TypeScript, and web performance optimization; Collaborate deeply with Data Science and Backend Engineers

Requirements

Software engineering experience with a deep specialization in modern JavaScript, TypeScript, and React; Proven ability to architect complex state management; Ability to design systems that handle complexity without becoming complicated; Experience elevating the skills of peers; Competence in writing robust and efficient unit and integration tests using Jest, Cypress, or Playwright; Deep understanding of web performance, browser internals, and optimization techniques for data-heavy applications; A Product Owner mindset

Nice to have

Experience in data visualization and analytics (handling large datasets, heavy DOM manipulation); A portfolio, GitHub 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 NoSQL/Columnar databases (MongoDB, Clickhouse)