Junior Fullstack Software Engineer

Cryptio; London; Remote; GBP 40,000 - 55,000; Full time

Job summary

Cryptio is seeking a Junior Fullstack Engineer to join their remote-first team in London. This role involves writing TypeScript code, improving APIs, and contributing to the development of their core product. Ideal candidates will have strong fundamentals in web technologies and a collaborative mindset.

Benefits

25 Days Paid Holiday

Birthday Off

Mental Health and Wellbeing Support

Attractive Maternity and Paternity Policies

Gym Classes or Spa Treatments

Apple MacBook Pro

$200 Workplace Budget

Training and Development Budget

4% Pension Contributions

Private Medical & Dental Insurance

Qualifications

• 3+ years of full stack development experience.
• Strong HTML, CSS, and JavaScript fundamentals.
• Hands-on experience with React, TypeScript, and NestJS.

Responsibilities

• Write clean, production-grade TypeScript code (both frontend and backend).
• Maintain and improve backend APIs and shared libraries.
• Contribute to testing framework and write robust E2E and unit tests.

Skills

HTML

CSS

JavaScript

React

TypeScript

NestJS

REST APIs

Git

GitLab

TailwindCSS

Emotion

Jest

Playwright

React Query

Job description

About Cryptio

Cryptio is building the data infrastructure for the crypto economy. Our enterprise-grade back-office platform helps businesses and institutions automate financial reporting and compliance for digital assets—so they can navigate the crypto space with confidence. Backed by top investors like Point Nine, 1kx, and BlueYard, we’ve raised $26M and work with industry leaders like Circle, Uniswap, and even the Government of El Salvador. Currently, we are a team of 80 amazing people. Crypto needs better infrastructure to go mainstream—and we’re here to build it!

Location

At Cryptio, we’re a remote-first team, with most working 100% remotely, while others enjoy a mix of office time in our hubs in London or Paris. This role requires candidates to be based in the UK, and we support the setup that works best for your lifestyle and productivity—whether that’s fully remote, in the office, or a blend of both!

The Team

We’re looking for a Junior Fullstack Engineer to join one of our fast-moving product squads. You’ll work closely with both our frontend and backend leads to improve connectivity across our stack, contribute to new features, and help strengthen our internal libraries and tooling. This is a great opportunity to grow your technical skills in a high-performing, supportive environment—while making a real impact on our product and customers.

Team Stack

• Languages & Frameworks: TypeScript, JavaScript, HTML, CSS

• Frontend: React, TailwindCSS, Emotion, React Query, Playwright, Jest

• Backend: NestJS, REST APIs

• Tooling: GitLab, Git

• Architecture: Microservices with strong code sharing across teams

What’s special about this role?

This is a fantastic opportunity for an early-career engineer to grow in a fast-paced, collaborative environment. You’ll work on both the frontend and backend of our core product, contributing to meaningful features and helping improve our development workflows. You'll be learning from experienced engineers, contributing to production code from day one, and playing a key role in shaping the future of crypto financial tooling.

What you'll be doing

• 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

We’re looking for someone who has

• 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

Nice to have

• Interest in or knowledge of the crypto ecosystem

• Previous experience with data-heavy products

• Experience working in a startup or fast-paced environment

Interview Process

1. Talent Screen - 45 min

2. Technical Interview - 60 min

3. Team Interview - 45 min

4. Leadership Interview - 45 min

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!

*UK have these additional benefits: 4% Pension Contributions towards your future + Private Medical & Dental Insurance with Allianz.

*France have these additional benefits: English language course options.