Senior React Engineer
Our client is a leading, fully regulated US-based digital asset trading platform. They provide secure, low-latency access to cryptocurrency markets, acting as a bridge between traditional finance and the Web3 ecosystem.
About This Role:
The Senior Software Engineer, Web is part of the Engineering team and reports to our Manager, Engineering. As Senior Software Engineer, Web, you will be responsible for designing and building scalable, high-performance web applications using Next.js and modern front-end technologies.
You will partner with Product, Design, Backend, and DevOps teams to deliver performant,accessible, and secure user experiences while contributing to front-end architecture and engineering best practices.
Key Responsibilities:
- Design and implement scalable front-end features using Next.js, React, and TypeScript
- Own end-to-end development of web features, including testing, deployment, and maintenance
- Build modular and reusable UI components to support scalable development
- Optimize web performance through SSR/SSG, lazy loading, and responsive design techniques
- Monitor and improve performance metrics such as page load time, TTI, and Core Web Vitals
- Collaborate cross-functionally with Product, Design, Backend, and DevOps teams to define requirements and deliver features
- Contribute to front-end architecture decisions and engineering best practices
- Participate in code reviews and mentor junior engineers to improve code quality and team standards
- Partner with DevOps to support CI/CD pipelines and reliable deployment processes
- Ensure high standards in code quality, accessibility, security, and automated testing (unit, integration, E2E)
We offer*:
- Flexible working format - remote, office-based or flexible
- A competitive salary and good compensation package
- Personalized career growth
- Professional development tools (mentorship program, tech talks and trainings, centers of excellence, and more)
- Active tech communities with regular knowledge sharing
- Education reimbursement
- Memorable anniversary presents
- Corporate events and team buildings
- Other location-specific benefits
*not applicable for freelancers
Required Qualifications:
- Bachelor’s or Master’s degree in Computer Science or related field
- 8 years of professional software engineering experience, or 6 with an advanced degree
- Strong communication and collaboration skills, motivation, problem solving mind set
- Strong proficiency in Next.js, React, TypeScript, JavaScript, HTML5, and CSS3
- Strong experience with GraphQL and REST API
- Experience with performance optimization tools (Lighthouse, WebPageTest, Chrome DevTools)
- Solid understanding of SSR/SSG, CDN strategies, caching, and responsive design principles
- Familiarity with front-end security best practices
- Experience with Git, CI/CD pipelines, and modern deployment workflows
- Exposure to cloud platforms such as AWS or GCP
- Strong collaboration skills working with Product, Design, and Backend teams
- Experience mentoring junior engineers and contributing to team development
- Bonus: Experience with analytics instrumentation or blockchain-integrated front-ends (e.g.,ethers.js, wallet integrations)
- English level: Upper-intermediate or higher, sufficient for daily team communication and code review discussions
N-iX
1 700
N-iX is a European software development service company that helps businesses across the globe develop successful software products. Founded in 2002 in Lviv, N-iX has come a long way and increased its presence in six countries spanning Europe and the US. Today, we are a strong community of 1,700+ professionals and a reliable partner for global industry leaders and Fortune 500 companies. N-iX is actively hiring in Poland and has an office in Krakow.