Junior Fullstack Software Engineer

Summary

Join Cryptio, a leading data infrastructure builder for the crypto economy, as a Junior Fullstack Engineer. Work remotely or in our London or Paris offices. Collaborate with a high-performing team to improve connectivity across the stack, contribute to new features, and strengthen internal libraries and tooling. This role offers significant growth opportunities in a supportive environment, impacting our product and customers. You will write clean, production-grade TypeScript code, maintain and improve backend APIs, contribute to testing, reduce technical debt, and work on new features end-to-end. Cryptio offers a comprehensive benefits package including remote work options, paid time off, and professional development opportunities.

Requirements

• 3+ years of full stack development experience
• Strong HTML, CSS, and JavaScript fundamentals
• Hands-on experience with React, TypeScript, and NestJS
• Familiarity with styling tools like TailwindCSS or Emotion
• Experience with frontend testing frameworks like Jest or Playwright
• Comfort working with REST APIs and managing state using tools like React Query
• Strong communication skills in written and spoken English
• Familiarity with modern development workflows (Git, GitLab)
• A collaborative, team-first mindset

Responsibilities

• Write clean, production-grade TypeScript code (both frontend and backend)
• Maintain and improve our backend APIs and shared libraries
• Contribute to our testing framework and write robust E2E and unit tests
• Help reduce technical debt and improve developer experience
• Work on new features end-to-end with product and engineering teams

Preferred Qualifications

• Interest in or knowledge of the crypto ecosystem
• Previous experience with data-heavy products
• Experience working in a startup or fast-paced environment

Benefits

• Fully-Remote / Hybrid – The choice is yours!
• 25 Days Paid Holiday + Bank Holidays
• Your Birthday Off
• Earn an extra day of annual leave for every year you're at Cryptio
• Access to Mental Health, Wellbeing, and Coaching
• Attractive Maternity and Paternity Policies for your growing family
• Gym Classes or Spa Treatments with ClassPass (or gym reimbursements)!
• Apple MacBook Pro – The best tech at your fingertips!
• $200 Workplace Budget to create your perfect home office!
• Training and Development Budget – Invest in yourself and grow!
• 4% Pension Contributions towards your future + Private Medical & Dental Insurance with Allianz
• English language course options