Full Stack Engineer (Next.js and App Router) Offline

Sii Ukraine is a subsidiary of Sii Poland — the leader in IT, engineering, and consultancy services with over 7500 IT experts in Poland and more than 250 prestigious customers. We are looking for ambitious and top-quality professionals to join our project teams.

We invite you to join a project for one of our clients, an international company, a leading global platform connecting students with educational opportunities through comprehensive search tools, expert guidance, and digital marketing solutions for institutions.

We seek a passionate Full Stack Engineer to enhance the teams currently working on merging several high-traffic web platforms into one unified global platform.

Your tasks:

• Develop and maintain scalable applications for both student-facing websites and institution-facing platforms.
• Implement new features such as enhanced search functionalities, logged-in experiences, and improved data structures.
• Assist in the migration of legacy platforms to a unified target platform.
• Take part in performance optimization by migrating from Next.js Page Router to App Router, implementing caching strategies (SSR/SSG), and enhancing SEO and Core Web Vitals.
• Write and maintain high-quality, testable code with strong unit test coverage using Jest and end-to-end testing with Cypress.
• Integrate with headless CMS (Sanity.io) and work on GraphQL and REST API implementations.
• Collaborate with UI/UX designers to enhance the user experience using design systems and component libraries like MUI.
• Implement A/B testing and feature flags using tools like GrowthBook.

• Work on CI/CD pipelines using Vercel-based CI/CD, AWS Amplify, and GitHub Actions.

   

Requirements:

• At least 4 years of experience with Next.js/React/Typescript, particularly App Router.
• Proficiency with testing frameworks such as Jest and Cypress.
• Familiarity with design systems and component libraries like MUI.
• Knowledge of GraphQL and REST API.
• Skilled in working with Vercel-based CI/CD and GitHub Actions.
• Experience with medium to high scale multi-locale consumer applications that operate with low latency.
• Expertise in SEO optimisations and Core Web Vitals optimisations.
• Experience with A/B testing, feature flags, and tools like GrowthBook.
• Familiarity with headless CMS. 

Our benefits:

• Free English, German and Polish classes;
• Medical insurance;
• Training and Certification;
• Mentorship program;
• Referral program;
• Corporate Volunteer Grant Programs;
• And other interesting opportunities!