Blockchain Engineer

ALLPS; Schweiz; On-site; CHF 110,000 - 170,000; Full time

Job summary

ALLPS is seeking a Blockchain Engineer with 2–5 years of hands-on experience to design, develop, and deploy smart contracts and blockchain-based applications. You will build and maintain DApps, integrate with backend systems, and optimize for security, gas efficiency, and performance.

The role requires Solidity expertise, Ethereum/EVM experience, and proficiency with Web3.js or Ethers.js, plus strong JavaScript/TypeScript skills. Collaboration with cross-functional teams is essential.

Qualifications

• 2–5 years hands-on blockchain development experience.
• Strong fundamentals: ledgers, consensus, cryptography.
• Solidity smart contract development experience.
• Hands-on Ethereum or EVM-compatible blockchain exposure.
• Proficiency with Web3 libraries (Web3.js / Ethers.js).
• Strong JavaScript/TypeScript skills (Python/Go/Rust a plus).
• REST APIs and backend integration experience.
• Git version control experience.
• Familiar with DeFi, NFTs, DAOs or Web3 products.
• Knowledge of Layer 2 scaling (Polygon, Optimism, Arbitrum).
• Exposure to IPFS, Chainlink, or cross-chain solutions.
• CI/CD and DevOps practices.

Responsibilities

• Design, develop, and deploy smart contracts and blockchain-based applications
• Build and maintain decentralized applications (DApps)
• Integrate blockchain solutions with backend systems and APIs
• Optimize smart contracts for performance, security, and gas efficiency
• Perform testing, debugging, and code reviews
• Identify and mitigate security risks and vulnerabilities
• Stay updated with blockchain trends, tools, and best practices
• Collaborate with product, engineering, and security teams

Skills

Smart contracts

Solidity

Ethereum/EVM

Web3.js / Ethers.js

JavaScript/TypeScript

REST APIs

Git

Security

DeFi / NFTs

Layer 2

IPFS / Chainlink

CI/CD / DevOps

Job description

About The RoleWe are looking for a Blockchain Engineer with 2–5 years of experience to build secure, scalable, and high-performance blockchain solutions. You will work on smart contracts, decentralized applications and blockchain integrations while collaborating with cross-functional teams.Key Responsibilities- Design, develop, and deploy smart contracts and blockchain-based applications- Build and maintain decentralized applications (DApps)- Integrate blockchain solutions with backend systems and APIs- Optimize smart contracts for performance, security, and gas efficiency- Perform testing, debugging, and code reviews- Identify and mitigate security risks and vulnerabilities- Stay updated with blockchain trends, tools, and best practices- Collaborate with product, engineering, and security teamsMust-Have Skills- 2–5 years of hands‑on experience in blockchain development- Strong understanding of blockchain fundamentals (distributed ledgers, consensus mechanisms, cryptography)- Proven experience with smart contract development (Solidity mandatory)- Hands‑on experience with Ethereum or EVM‑compatible blockchains- Proficiency in Web3.js, Ethers.js, or similar Web3 libraries- Strong programming skills in JavaScript / TypeScript (Python, Go, or Rust is a plus)- Experience with REST APIs and backend integration- Solid understanding of data structures, algorithms, and system design- Experience with Git and version control systemsGood‑to‑Have Skills- Experience with DeFi protocols, NFTs, DAOs, or Web3 products- Knowledge of Layer 2 scaling solutions (Polygon, Optimism, Arbitrum)- Familiarity with smart contract security audits and best practices- Exposure to IPFS, oracles (Chainlink), or cross‑chain solutions- Experience with Solana, Hyperledger, or other non‑EVM blockchains- Knowledge of cloud platforms (AWS, Azure, GCP)- Experience with CI/CD pipelines and DevOps practices

Responsibilities

• Design, develop, and deploy smart contracts and blockchain-based applications
• Build and maintain decentralized applications (DApps)
• Integrate blockchain solutions with backend systems and APIs
• Optimize smart contracts for performance, security, and gas efficiency
• Perform testing, debugging, and code reviews
• Identify and mitigate security risks and vulnerabilities
• Stay updated with blockchain trends, tools, and best practices
• Collaborate with product, engineering, and security teams

Requirements

• 2–5 years of hands‑on experience in blockchain development
• Strong understanding of blockchain fundamentals (distributed ledgers, consensus mechanisms, cryptography)
• Proven experience with smart contract development (Solidity mandatory)
• Hands‑on experience with Ethereum or EVM‑compatible blockchains
• Proficiency in Web3.js, Ethers.js, or similar Web3 libraries
• Strong programming skills in JavaScript / TypeScript (Python, Go, or Rust is a plus)
• Experience with REST APIs and backend integration
• Solid understanding of data structures, algorithms, and system design
• Experience with Git and version control systems
• Experience with DeFi protocols, NFTs, DAOs, or Web3 products
• Knowledge of Layer 2 scaling solutions (Polygon, Optimism, Arbitrum)
• Familiarity with smart contract security audits and best practices
• Exposure to IPFS, oracles (Chainlink), or cross‑chain solutions
• Experience with Solana, Hyperledger, or other non‑EVM blockchains
• Knowledge of cloud platforms (AWS, Azure, GCP)
• Experience with CI/CD pipelines and DevOps practices

Tech stack

• Solidity
• Blockchain
• Web3
• Smart Contract