Senior Full Stack Engineer (React/Next.js)

About the role

Kiloverse is looking for a Senior Full Stack Engineer to shape the architecture and delivery of its fast‑growing health, wellness, beauty and travel ventures. You will own features across the stack, work closely with product and operations teams, and mentor junior engineers.

Key responsibilities

• Design, develop and maintain full‑stack features using React, Next.js and PHP (Laravel/Symfony).
• Own complex domain logic, third‑party integrations and performance optimisation across the stack.
• Make architectural decisions and define clean, well‑documented APIs.
• Collaborate with frontend engineers, product owners and operations to deliver high‑impact features.
• Mentor and delegate tasks to build a strong senior‑level engineering team.
• Improve development processes, code quality and engineering standards.

Required profile

• Strong full‑stack fundamentals with a solid backend foundation (clean architecture, design patterns, testing).
• Experience with PHP frameworks such as Laravel or Symfony.
• Proficiency in React and Next.js for modern frontend development.
• Ability to work autonomously from design through deployment and optimisation.
• Senior mindset: ownership, technical leadership and proactive problem‑solving.

Required skills

• React
• Next.js
• PHP
• Laravel
• Symfony

What we offer

• Gross salary €4,500‑€6,500 per month.
• Flexible work arrangements: hybrid model with office hubs in Vilnius and Kaunas.
• Health insurance, on‑site physiotherapist, office gym and fitness classes.
• Additional paid days off, including 7 extra days and 3 wedding days.
• Pet‑friendly office, free meals, snacks and regular social events.