Solidity Engineer

Core skill: Solidity and smart contracts development — this is the primary focus of the role and the key selection criterion.

• At least 4 years of commercial development experience
• Deep knowledge of Go and Solidity
• Hands-on experience with blockchain platforms (Ethereum, Solana, Tron, etc.), DeFi and dApp architectures
• Candidates must be able to discuss real projects, system architectures and their own experience in depth during the technical interview

Position Name: Research & Development Engineer (Blockchain / Smart Contracts)
Level: Senior
Headcount: 3 (client stated 2–3 engineers)

Hard skills requirements:

• At least 4 years of experience as a developer
• Solidity and smart contracts development - core skill, primary focus of the role
• Deep knowledge of Go
• Expertise in Web3
• Experience working with blockchain platforms (Ethereum, Solana, Tron, etc.)
• Experience with cryptographic protocols and smart contracts
• Experience with DeFi
• Knowledge of decentralized application (dApps) architectures
• Understanding the specifics of cryptocurrency transactions and smart contracts
• Experience with version control systems (Git)

Nice to Have:

• Rust, JavaScript, Node.js, Python
• Experience with financial operations and high-load systems
• Knowledge of containerization and DevOps infrastructure (Docker, Kubernetes)

Soft skills requirements:

• A passion for problem-solving and finding innovative solutions
• Strong communication — able to discuss real projects, architectures and past experience in technical depth
• Research mindset — comfortable with R&D work on new technologies
• Proactivity and ownership

Responsibilities:

• Develop and implement innovative solutions for the company's products in the blockchain and crypto-processing sector
• Write clean, high-quality, maintainable code
• Integrate new functionalities into existing solutions and system architectures
• Integrate blockchain platforms with the company's existing systems
• Conduct code reviews and ensure code security
• Participate in architectural discussions and develop scalable system architectures
• Work with APIs to interact with crypto-payment gateways and external services
• Analyze system performance, identify bottlenecks, and optimize the system
• Participate in the development of new products and services based on blockchain technologies, including MPC and distributed signing

English: Upper-Intermediate (client's own posting states B1-B2)
Office/Remote: Remote. Full-time preferred through EOY 2026 (part-time 15–20 hrs/week possible); full-time required from 2027
Time zone: EST overlap — team is US-based in Tampa, Florida