De-Fi Internship (Zurich)

G-20 Group; Zürich; On-site; CHF 20,000 - 31,000; Part time

Job summary

G-20 Group is seeking a motivated DeFi Developer & Engineer Intern to gain hands-on experience in blockchain tech, DeFi, and quantitative trading at our Zurich office. You will work with engineers, researchers, and traders on trading infrastructure and DeFi apps.

The role emphasizes programming fundamentals, curiosity about crypto markets, and a fast-paced, collaborative environment. On-site only in Zurich.

Qualifications

• Pursuing or recently completed Bachelor's or Master's in CS/CE/Math.
• Strong programming fundamentals with proficiency in Python/C++/Rust/TypeScript/Solidity.
• Basic understanding of blockchain tech, smart contracts, and DeFi.
• Familiarity with Ethereum or EVM-compatible chains.
• Interest in crypto markets, algorithmic trading, and fintech.
• Strong analytical and problem-solving skills; eager to learn.
• Ability to work collaboratively in a fast-paced environment.
• Fluent English communication.

Responsibilities

• Support development of trading algorithms, infrastructure, and blockchain connectivity.
• Research DeFi protocols and on-chain data for opportunities.
• Assist in developing, testing, and deploying smart contracts and apps.
• Explore emerging blockchain technologies and development frameworks.
• Collaborate with engineers and traders to support automated trading solutions.
• Monitor DeFi protocol developments and share findings with the team.
• Participate in code reviews, debugging, testing, and documentation.

Skills

Python

C++

Rust

TypeScript

Solidity

English (Fluent)

Blockchain basics

Education

Bachelor's or Master's in CS/CE/Math

Tools

Foundry

Hardhat

ethers.js

Git

Job description

Important: Please only apply if you are able to work on-site at our Zurich office every working day. This is a fully office-based role with no option for remote work.

About G20 Group

G-20 Group is a cross-asset trading firm headquartered in Switzerland, trading delta-one and derivatives markets globally. We combine startup agility with institutional-grade experience in proprietary trading, technology, and quantitative finance.

Role Overview

We are looking for a motivated and technically curious DeFi Developer & Engineer Intern to join our global trading firm. This is an opportunity to gain hands‑on experience in blockchain technology, decentralized finance (DeFi), and quantitative trading within a collaborative, technology-driven environment.

Working alongside experienced engineers, quantitative researchers, and traders, you will contribute to the development of blockchain-based solutions, trading infrastructure, and DeFi applications. The ideal candidate will have strong programming fundamentals, a genuine interest in cryptocurrency markets, and a desire to develop their technical expertise in a fast‑paced trading environment.

Responsibilities

• Support the development and improvement of trading algorithms, infrastructure, and blockchain connectivity solutions.
• Research and analyze DeFi protocols, blockchain ecosystems, and on‑chain data to identify opportunities for innovation.
• Assist in developing, testing, and deploying smart contracts and blockchain-based applications.
• Explore emerging blockchain technologies, protocols, and development frameworks.
• Collaborate with engineers and traders to support the implementation of automated trading and market‑making solutions.
• Monitor developments across DeFi protocols and cryptocurrency markets, sharing relevant findings with the team.
• Participate in code reviews, debugging, testing, and technical documentation.

• Currently pursuing or recently completed a Bachelor's or Master's degree in Computer Science, Computer Engineering, Mathematics, or a related technical discipline.

• Strong programming fundamentals, with proficiency in at least one of the following: Python, C++, Rust, TypeScript, or Solidity.

• Basic understanding of blockchain technology, smart contracts, and decentralized finance.

• Familiarity with Ethereum, EVM‑compatible chains, or other blockchain ecosystems.

• Interest in cryptocurrency markets, algorithmic trading, and financial technology.

• Strong analytical and problem‑solving skills, with an eagerness to learn and tackle complex technical challenges.

• Ability to work collaboratively in a fast‑paced environment.

• Fluent English communication skills.

Preferred / Desirable Experience

• Academic projects, personal projects, internships, or contributions to open‑source blockchain applications.

• Exposure to smart contract development using Solidity or other blockchain programming languages.

• Familiarity with DeFi protocols, decentralized exchanges (DEXs), or on‑chain analytics.

• Experience with Web3 development tools and frameworks such as Foundry, Hardhat, or ethers.js.

• Basic understanding of quantitative trading, market making, or financial markets.

• Familiarity with Git, APIs, and software development best practices.

Locations and Right to work

This role will be based out of our Zurich office. Only candidates who possess the pre‑existing right to work in Switzerland without company sponsorship need apply.

Join G-20 and be a part of a team that is at the forefront of financial markets, driving innovation and excellence in the sector.