Software Engineer III - Mobile/Web

Software Engineer III focused on mobile and web platforms. Develop and evolve features in the app using Kotlin Multiplatform/Compose Multiplatform as the main technology; build and maintain webview initiatives and contribute to web development when hypothesis cycles require it; integrate REST APIs with strong contracts, resilience, and observability from the start; maintain disciplined contributions in a shared repository (monorepo or unified structure) with code conventions, inline documentation, and CI/CD. Implement automated tests that validate the product as a whole; use observability (logs, metrics, tracing) to monitor health and drive investigations; participate in the full delivery cycle (deploys, releases, rollbacks). Collaborate with cross-functional teams (product, data, backend) and contribute to the technical growth of more junior teammates; work with open-ended scope and autonomy to raise hypotheses and help structure solutions. Desired skills include mobile development experience (Android native, Flutter, or KMP/CMP – bonus if already KMP/CMP), web development familiarity (HTML/CSS/JS or frameworks like React/Vue), solid API integration experience (REST, authentication, error handling, performance), basic understanding of system architecture, and familiarity with observability and monitoring culture. Nice-to-haves include genuine interest in AI-assisted development, prior KMP/CMP experience or willingness to learn, hypothesis testing/A/B testing experience, and experience with hybrid webview in mobile apps. Benefits include health and dental plans, virtual hospital access, meal/food vouchers, SESC, flexible hours, education benefit, Gympass, childcare assistance, fixed salary + possible PLR, life insurance, and transportation for on-site roles. The company emphasizes autonomous, impactful work on solutions that serve Brazilian entrepreneurs and invites applicants to join the Stone culture and mission, with remote-work option indicated (#Li-remote).