Software Engineer Backend developing backend solutions for mobile apps using JSON/REST. Collaborating on agile projects with a focus on modern frameworks and server infrastructure.
About the role
- Web SDK Developer leading the development of a JavaScript SDK for global customer engagement. Focused on performance, scalability, and modern coding practices in Gdańsk office.
Responsibilities
- Design, build, and maintain the Acoustic Connect Web SDK, enabling enterprise-grade customer engagement and behavioral analytics features for web applications.
- Deliver high-quality, performant, and scalable SDK modules that integrate seamlessly with client websites and web applications across different browsers and environments.
- Take ownership of the full SDK lifecycle: from architectural design to public documentation and ongoing developer support.
- Continuously improve SDK codebase with best practices in modularity, testability, and maintainability.
- Refactor or retire legacy code and modules, aligning the SDK with modern JavaScript/TypeScript best practices and long-term maintainability.
- Proactively identify performance bottlenecks and lead improvements using browser profiling tools and web performance monitoring.
Requirements
- Minimum 3-5 years of experience in JavaScript development.
- Proven ability to develop concise and lightweight SDKs with excellent performance and minimal impact on page load times.
- Deep understanding and experience with modern JavaScript (ES6+) and TypeScript.
- Strong knowledge of browser APIs, DOM manipulation, event handling, and cross-browser compatibility.
- Experience with build tools (Webpack, Rollup, Vite), package managers (npm, yarn), and module systems (CommonJS, ES modules, UMD).
- Knowledge of web app lifecycle, memory management, and performance optimization techniques specific to browser environments.
- Understanding of best practices for API versioning, backwards compatibility, and public SDK API design.
- Experience with testing frameworks (Jest, Mocha) and ensuring high code coverage through unit and integration testing.
- Keeping up to date with web ecosystem changes (new browser APIs, privacy changes like third-party cookie deprecation, security best practices) and applying them in SDK development.
Benefits
- Direct impact on our product and three growth paths: Architect, Principal Software Engineer, or Manager.
- Remote or hybrid work from our Gdansk office (up to you!)
- Competitive benefits, including tax-deductible costs, MacBook Pro, medical and life insurance, meal allowance, and a Multisport card.
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