Fullstack Engineer (Web3)

Next Matter; Paris; Sur place; EUR 60 000 - 80 000; Plein temps

Résumé du poste

A leading tech company in Paris is seeking a Fullstack Engineer to develop SaaS/API-first products. You'll work on both frontend and backend, with an emphasis on Web3 technologies and collaboration across teams. The ideal candidate has over 3 years of experience and is fluent in English. This position offers competitive compensation and flexible remote work options.

Prestations

Competitive salary

Flexible holiday

Internet reimbursement up to €50/month

Qualifications

• 3+ years of experience as a Fullstack Engineer designing user-facing API-based products.
• Proven programming skills in TypeScript and React.
• 1+ year of Web3 experience building dApps.

Responsabilités

• Contribute to architectural decisions and technical strategy.
• Design, develop, and implement new features.
• Participate in code review, testing, and bug fixing.

Connaissances

TypeScript

React

Web3 experience

Problem-solving

Fluent in English

Outils

PHP/Laravel

Golang

Solidity

Kubernetes

Description du poste

Full time - Paris hybrid or Remote from France

Kiln is now part of the prestigious French Government program #FT120 from La French Tech! 🎉 🇫🇷

As a Fullstack Engineer at Kiln, you will join our Software Development Team, to build the future of our SaaS/API-first products [https://docs.kiln.fi/v1/]. You will report to our Lead Software Engineer, and collaborate with the Product, Infrastructure and Smart-Contract teams to work on the various products that Kiln offers.

Responsibilities:

• Contribute to architectural decisions and technical strategy.
• Be an active contributor within the Fullstack squad owning Kiln user-facing products (Dashboard, Widget).
• Design, develop and implement new features :
  • 70% frontend (e.g. using our design system to build new features or adding new components to it…).
  • 30% backend (e.g. implement the transaction crafting part for a new protocol…).
• Participate in code review, test and CI/CD processes, bug fixing, and code maintenance.
• Interact with customers for debugging purposes and product discovery.
• Make sure we respect any software security norms (Kiln is a SOC 2 Type 1 and Type 2 company).
• Actively suggest continuous improvement of Kiln's platform and engineering practices.
• Communicate with other Kiln teams to help them understand the Software roadmap and technical challenges.

Stack: TypeScript, React, PHP/Laravel, REST API

Other engineering stacks: Software (Golang); Smart contract (Solidity); Infrastructure (Kubernetes)

Requirements:

• +3 years of experience as Fullstack Engineer, designing, building, and deploying user-facing API-based products.
• Proven TypeScript and React programming skills — professional experience in a production environment.
• +1 year of Web3 experience, building dApps using libraries such as Wagmi and Viem.
• Familiar with software development best practices (Test, CI/CD, DevOps, Security…).
• Previous experience collaborating in a team-based development environment (sprints, code reviews, standups, problem-solving sessions).
• Curiosity and ability to dig into a topic and follow through.
• Ability to balance between impact and thoroughness in a fast-paced environment.
• Proven interest in Web3, blockchain, cryptocurrency - with solid understanding of protocols, staking, and DeFi.
• Fluent in English.

Nice-to-have:

• Familiar with Ethereum Virtual Machine and smart contracts.
• Knowledge on how to craft raw blockchain transactions.
• Backend PHP/Laravel programming skills.
• Experience in a fast-growing, early-stage startup.

About Kiln:

Kiln is the leading enterprise-grade rewards platform that enables institutional customers to stake assets and integrate staking & DeFi functionality into their offerings. Our API-first platform provides fully automated validators, staking & DeFi protocols access, and comprehensive data and commission management.

With $13+ billion in crypto assets staked through our platform, Kiln has established a strong presence on Ethereum, managing over 5% of the network through 45,000+ validators — all with zero slashing events.

Kiln serves more than 140 leading customers, including Binance, Bitpanda, BitGo, Fireblocks, VanEck, and TrustWallet.

Our team of 100 ecosystem enthusiasts brings experience from industry leaders like Google, Circle, Ledger, Chainalysis, and other prominent technology and cryptocurrency companies.

We've raised $30M in total funding from prominent investors including 1kx, Crypto.com, Illuminate Financial, Consensys, Wintermute, Kraken Ventures...

Join Kiln and help us make the web more secure, stable, decentralized, and fair!

How Kiln will support you:

• A fast-paced, no bureaucratic work environment
• Equity share options in the business: if Kiln succeeds, we all succeed!
• Competitive salary
• Flexible holiday
• Flexible remote working
• Internet connection paid up to €50/month
• Significant personal development and tech conf budget

Your interview process:

1. Recruiter Interview (40 min)
2. Take-home test (< 3 hours)
3. Technical Interview (60 min)
4. Core Values Interview (45 min)
5. Founders Interview (30 min)
6. Offer!

Please note that we are not sponsoring visas for persons without work authorization in the UK or the EU. This role is specifically for employees (no B2B or contractors) based in the EU and the UK.