Senior React SDK Developer

About the role

You will join the SDK team at Stream with a core responsibility for developing and maintaining our React Chat, Feeds, and Video SDKs while driving them to the next level of performance and developer experience. In this role, you will design and implement new features aligned with our product roadmap and ensure the stability of existing functionality through rigorous testing and maintenance. You will engage directly with both existing customers and prospective users via multiple support channels to gather feedback and resolve SDK-related challenges. A significant part of your work will involve improving documentation, crafting clear examples, and keeping all SDKs up-to-date with modern best practices. Collaboration will be central as you work alongside backend engineers, designers, and other SDK teams to refine feature specifications and maintain consistency across implementations. You will also contribute to open-source projects, ensuring that our public SDKs remain robust, scalable, and trusted by the developer community. This role gives you ownership of complex technical decisions that directly impact thousands of engineers and billions of end users who rely on our infrastructure.

Key facts

What you'll do

• Integrate new features from the product roadmap into the React, Feeds, and Video SDKs while maintaining high code quality.
• Support developers using our SDKs through forums, GitHub issues, and direct communication to resolve blockers quickly.
• Refactor legacy SDK code to improve maintainability, readability, and long-term extensibility.
• Enhance SDK documentation with clear guides, API references, and practical examples for common use cases.
• Profile and optimize SDK performance to reduce bundle size, minimize load times, and lower runtime resource consumption.
• Collaborate with backend engineers to validate API contracts, ensure proper integration, and align on evolving data structures.
• Implement robust test suites using Vitest and Jest to increase confidence in releases and prevent regressions.
• Utilize Playwright for end-to-end testing scenarios that reflect real-world developer workflows.
• Monitor browser performance metrics and apply techniques such as virtualization, memoization, and lazy loading where appropriate.
• Represent Stream at developer conferences, meetups, and online events to showcase SDK capabilities and gather insights.

Requirements

• Comes from a startup background and has adapted to fast-paced, evolving environments before.
• Has 5+ years of professional software development experience working with modern frontend tools.
• Has experience contributing to open-source projects and building tools that other developers use.
• Demonstrates a solid understanding of React fundamentals, hooks, context, and component lifecycle patterns.
• Understands popular React libraries and ecosystems, including routing, state management, and UI component systems.
• Has a solid grasp of browser performance characteristics and how they affect real-world applications.
• Enjoys working with TypeScript and leverages strict type-checking to catch errors early.
• Pays close attention to UX details, with a strong focus on accessibility standards and inclusive design.
• Knows standard performance optimization techniques such as state management strategies, memoization, and virtualization.
• Practices writing and maintaining automated tests, valuing a robust test suite for reliable releases.

Nice to have

• Experience with React Native, Angular, Vue, or any other modern UI framework beyond React.

Practical notes

• This is a full-time position based in our Skopje office.
• No specific working hours are mentioned in the source, but the role expects full-time commitment.
• There is no mention of visa or travel requirements within the provided source information.
• No application deadline is specified in the source material.

Our tech stack

At Stream, we use a wide collection of technologies to offer highly optimized and available features to our customers. Here is a shortlist of the technology that we currently use in the React Chat, Video and Feeds SDKs:

• Modern React, TypeScript, RxJS, WebRTC, Protobuf, Twirp, OpenAPI
• React Virtuoso, React Markdown and Remark, WASM and WebWorkers
• Vitest, Jest, Playwright

Who we are

Stream has a casual, social, and playful culture. We are talented, highly technical, and collaborative which makes Stream a great place to learn and improve your skills. Our team is forward-thinking and diverse and we all have different backgrounds which lends to our creativity and innovation. With offices in Boulder and Amsterdam, our employees represent 15 countries, 11 languages and counting. Our team is passionate about tackling difficult tech problems at scale by creating reusable components that allow product owners to ship apps faster, more securely, and with a better user experience. Our culture is oriented towards ownership and quality; Our goal is to produce deliverable software.

What's in it for you

• A team of exceptional engineers working on impactful products.
• The chance to work on open-source SDK projects that reach a global audience.
• A competitive salary and company equity to share in our growth.
• A pension scheme for long-term financial security.
• A generous Learning and Development budget for continuous skill improvement.
• Commute expenses to Amsterdam covered or the option to use a company bike within the city.
• Gym membership of choice covered for a healthy work-life balance.
• A MacBook Pro or another development setup to support your productivity.
• Healthy team lunches and plenty of snacks to keep energy high during the day.
• A generous relocation package for those moving to our location.
• An office in the heart of Amsterdam for those working from our European hub.
• The opportunity to attend or present to global conferences and meetups.
• The possibility to visit our office in Boulder, CO for those on the other side of the Atlantic.

These benefits apply to the office in Amsterdam and are adjusted depending on the location.

Stream provides equal employment opportunities to all employees and applicants for employment and prohibits discrimination and harassment of any type without regard to race, color, religion, age, sex, national origin, disability status, genetics, protected veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by federal, state or local laws. This policy applies to all terms and conditions of employment, including recruiting, hiring, placement, promotion, termination, layoff, recall, transfer, leaves of absence, compensation and training.

Hybrid office policy: applicants based (or relocating to) one of our office locations are expected to work according to the applicable local office attendance policy.

Equal opportunity employer statement: Stream provides equal employment opportunities to all employees and applicants for employment.