Full-Stack Developer (Next.js, React Native)

Kyivstar.Tech is looking for a frontend-focused Full-Stack Developer (Next.js, React Native) to join the Packly project. Packly is a FoodTech service-marketplace where cafés, restaurants, and supermarkets can sell surplus inventory, and users can buy quality food at substantial discounts. We are looking for an engineer with architectural thinking who can take end-to-end ownership of features— from designing the database schema to building the UI in a mobile WebView. Kyivstar.Tech is a Ukrainian hybrid IT company and a resident of Diia.City. We are a subsidiary of Kyivstar, one of Ukraine's largest telecom operators. Our mission is to change lives in Ukraine and around the world by creating technological solutions and products that unleash the potential of businesses and meet users' needs.   Over 600+ KS.Tech specialists work daily in various areas: mobile and web solutions, as well as design, development, support, and technical maintenance of high-performance systems and services. We believe in innovations that truly bring quality changes and constantly challenge conventional approaches and solutions. Each of us is an adherent of entrepreneurial culture, which allows us never to stop, to evolve, and to create something new.  What you will do

Develop and maintain the Packly web application

Implement and optimize the frontend for reliable operation in WebView

Work with server-side logic, APIs, and databases

Collaborate with the mobile team

Participate in designing technical solutions

Required qualifications and experience

3+ years of commercial experience in web development

Solid understanding of computer science, algorithms, and data structures

Strong command of OOP principles, SOLID, DRY, KISS, and design patterns

Expert knowledge of TypeScript and React (Hooks, Context)

Deep understanding of Next.js (App Router, Server Actions, SSR/SSG strategies, Web Vitals optimization)

Experience designing relational databases (PostgreSQL): normalization, indexing

Understanding of REST API principles and web security (JWT, OWASP)

Experience setting up CI/CD pipelines (Vercel, GitHub Actions)

Ability to write tests (Jest, Cypress/Playwright)

High-quality code reviews; GitFlow or Trunk-based development

A plus would be

Experience with React Native

Hands-on experience with Supabase: Auth, Row Level Security (RLS), Edge Functions, Realtime

Understanding WebView specifics: two-way bridge communication and adapting web UI for mobile UX

What we offer

Office or remote – it’s up to you. You can work from anywhere, and we will arrange your workplace

Remote onboarding  

Performance bonuses for everyone (annual or quarterly — depends on the role)               

We train employees: with the opportunity to learn through the company’s library, internal resources, and programs from partners            

Health and life insurance        

Wellbeing program and corporate psychologist             

Reimbursement of expenses for Kyivstar mobile communication