Mid/Senior Full-Stack Engineer

Summary

Join LI.FI's Jumper team as a Mid/Senior Full-Stack Engineer and co-lead the design, development, and maintenance of Jumper apps, focusing on frontend development. You will architect and implement scalable infrastructure, develop comprehensive test suites, design high-quality frontend applications, and lead backend system and API development. Collaborate closely with a small, agile team. The ideal candidate has 3-4 years of experience, including frontend work with React/Next.js, strong communication skills, UX/UI experience, and knowledge of testing frameworks. Location must be in the EMEA region. Previous crypto experience and a Computer Science degree are a plus. LI.FI offers various benefits including annual team offsites, 30 days of PTO, flexible remote days and hours, equity participation, a work computer, a yearly conference allowance, and a personal development budget.

Requirements

• Must be located in the EMEA region
• At least 3/4 years of working experience, including 1/2 years focusing on frontend work using React/Next.js
• Effective communication skills (in English) with the ability to build relationships and work in a small but excellent team while self-guided on a day-to-day basis
• Experience in UX/UI development
• Experience in software design and architecture
• Knowledge of testing frameworks and principles
• Previous working experience in the crypto space or related technical understanding
• Passion for new technologies and ability to autonomously evaluate them and make suggestions for improvement

Responsibilities

• Architecting and implementing scalable and robust infrastructure solutions that can handle growing user loads and evolving business needs (we are already used by over 150k monthly active users)
• Developing and maintaining comprehensive test suites, including unit tests, integration tests, and end-to-end tests
• Design and develop high quality frontend applications that are testable and maintainable
• Be responsible for development of prototypes, new frontend features and React components
• Leading the design, development, and maintenance of a newly developed Jumper backend system and APIs
• Collaborate closely with the Software Engineers, Product Manager and Designers within your team

Preferred Qualifications

• Previous working experience in consumer applications is a plus
• Bachelor's or Master's degree in Computer Science is a plus

Benefits

• Annual team offsites (Thailand in 2023 and Vietnam in 2024 were a blast, Marrakech in March 2025 was blast-ier; let’s see what happens in 2026!)
• 30 days of PTO
• Flexible remote days
• Flexible working hours
• Equity participation from day 1
• Entitlement to work computer (choice of equipment)
• 1 Conference per year near your city of residence
• An annual 1,000€ personal development budget once you have worked 6+ months (pro-rated the first year)
• A one-time 1,000€ remote budget to use on coworking, office setup, etc