Senior Frontend Engineer (React)

Nix

Poland; Portugal; Romania; Spain (European Union, LATAM, Ukraine) Remote permanent

Posted: May 6, 2026

Required Skills

Job Description

Company Overview

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 a 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.

Working hours 12:00 - 20:00 CET.

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).

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).

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

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