Web SDK Developer (JavaScript)

Acoustic; Województwo pomorskie; Hybrid; PLN 60,000 - 80,000; Full time

Job summary

A leading technology company is seeking a Web SDK Developer to create a scalable and user-friendly JavaScript SDK. You will design and improve the Acoustic Connect Web SDK, ensuring performance and integration with client applications. The ideal candidate should have 3-5 years of JavaScript development experience, with strong skills in TypeScript and an understanding of browser APIs. This role offers remote or hybrid work from the Gdansk office and includes competitive benefits like medical insurance and a MacBook Pro.

Benefits

Competitive benefits

MacBook Pro

Medical and life insurance

Meal allowance

Multisport card

Qualifications

• 3-5 years of experience in JavaScript development.
• Ability to develop lightweight SDKs with excellent performance.
• Strong knowledge of browser APIs and DOM manipulation.
• Experience with build tools and package managers.
• Understanding of API versioning and public SDK design.

Responsibilities

• Design and maintain the Acoustic Connect Web SDK.
• Deliver high-quality, scalable SDK modules for various applications.
• Improve SDK codebase with best practices.
• Identify and lead improvements for performance bottlenecks.

Skills

JavaScript development

TypeScript

Browser APIs

Performance optimization

Testing frameworks

Tools

Webpack

Rollup

Vite

npm

yarn

Job description

We’re seeking a Web SDK Developer to lead the development of a reliable, scalable, and user-friendly JavaScript SDK used by customers worldwide.

Key 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.

Minimum 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.

What will set you apart?

• Experience with mobile SDK development (iOS, Android) or cross-platform frameworks (React Native, Flutter) is a bonus.
• Knowledge of web analytics, tracking technologies, identity management, and data privacy regulations (GDPR, CCPA).

Not checking all of the above boxes, but still feeling strong about a career in software development?

We want to hear from you anyway!

What We Offer

• 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.