Senior/Lead Full Stack Developer

Every software platform faces a moment when complexity threatens to slow progress and cloud decisions. The Senior/Lead Full Stack Developer role in Portugal is fully remote and sits at the point where technical leadership and hands-on expertise keep delivery moving forward. Teams rely on clear direction and early action to avoid problems that could stall momentum. You set the standard for best practices and guide the team through challenges before they become blockers. The person in this role shapes how the team delivers reliable, scalable software that stands up to real-world demands. Responsibilities Fulfill all Senior Engineer responsibilities and Q4 Staff Engineer expectations Drive and deliver large tasks with minimal direction Help the team refine product requirements and ideas Provide technical leadership to the team Define best practices and processes for development Anticipate team problems and take action early to avoid them Evangelize best practices and act as a strong communicator Requirements Fluency in JavaScript with modern ES6 syntax, CSS3, ReactJS, Redux, GraphQL, Jasmine, Jest, redux-saga, redux-thunk, webpack, eslint, WebdriverIO, nginx and Jenkins Understanding of web application designs, continuous integration/continuous deployment, web testing automation, secure coding practices and security-focused testing Experience with browser testing using Saucelabs Solid knowledge of source control, especially tools such as Git and GitHub flows Fluency in either Android (Java 8+, Kotlin, SQLite), iOS (Swift, Objective-C, Cocoapods), or C++ technology set, with experience in Xcode, Android Studio, IntelliJ or similar IDEs Experience deploying an app on the respective Google Play Store or Apple App Store (or comparative experience for internal corporate development) Experience with dependency management, SDKs and API contracts Fluency in Java and/or Python, with strong knowledge of software development methodologies and best practices Experience with distributed data systems such as Spark, BigQuery, Kafka, and designing and modeling both logical and physical data models, with SQL and NoSQL experience Experience with Terraform, strong knowledge and experience of at least one cloud platform (AWS, CGP, etc.), configuring and managing cloud networking, cloud database management, and hands-on experience managing and using ELK/OpenSearch clusters