Senior Blockchain Engineer

About BitFit Labs We are building enterprise cryptocurrency wallet powered by advanced Multi-Party Computation (MPC) Threshold Signature Scheme (TSS). This solution provides institutional-grade security for asset custody through distributed key management technology. Core Features: - Signature Scheme: 2/3 threshold signature distribution - Multi-chain Support: Bitcoin (BTC), XRP, Solana (SOL), EVM-compatible chains (Ethereum, BNB Chain, Avalanche, Arbitrum, Polygon, etc.), TRON - Hardware Integration: Support for Ledger and Trezor hardware wallets - Secure Key Management: TSS nodes distributed across isolated environments with HSM integration

Key Responsibilities - MPC/TSS Wallet Development - MPC Protocol Implementation: Design and implement MPC (Multi-Party Computation) protocols in Golang to build highly available private key sharding and distributed signature services - Key Lifecycle Management: Develop secure end-to-end key lifecycle management systems including key generation, storage, recovery, and destruction - Threshold Signature Scheme (TSS): Implement TSS algorithms and secure multi-party computation protocols for 2/3 signature distribution - Multi-chain Integration: Build integration layers for multiple blockchain networks including Bitcoin (BTC), XRP, Solana (SOL), EVM-compatible chains (ETH, BNB, AVAX, ARB, POL), and TRON - Hardware Security: Integrate HSM (Hardware Security Module) solutions (YubiHSM, AWS CloudHSM, Azure Dedicated HSM) for enhanced security - API Development - Internal APIs: Build and maintain internal APIs to expose pool data, routing results, and token balances to frontend services - Wallet APIs: Develop secure APIs for wallet operations, transaction signing, and blockchain interactions - Hardware Wallet Integration: Implement interfaces for Ledger and Trezor hardware wallet integration - System Architecture - Microservices Design: Architect scalable, secure microservice architecture supporting MPC wallet operations - Performance Optimization: Optimize high-performance data pipelines and real-time event processing systems - Security Implementation: Implement security best practices across all wallet and trading operations

Requirements - Experience: 5+ years of backend development experience, with 3+ years focused on Golang development - MPC/TSS Expertise: Deep understanding of MPC/TSS technology stack with actual production system development experience - Cryptography: Strong knowledge of Elliptic Curve Cryptography (ECC), Zero-Knowledge Proofs, and Threshold Signature schemes - Blockchain Protocol Experience: Extensive experience in blockchain protocol layer development, familiar with at least Ethereum, Bitcoin, and Solana mainstream public chains - Security Systems: Development experience in high-security systems (financial, payments, cryptocurrency) - Cloud Native: Proficiency with Docker, Kubernetes, and CI/CD cloud-native technology stacks - System Design: Excellent system design capabilities with experience designing scalable microservice architectures - Data Pipelines: Experience building high-performance data pipelines and real-time event processing systems

Preferred Qualifications - Wallet & Custody Experience: - Practical development experience with digital wallets, exchanges, or custody services - Familiarity with BIP-32, BIP-39, BIP-44 wallet standards - Open Source & Community: - Contributions to open-source blockchain projects (Cosmos SDK, Ethereum clients, etc.) - Active participation in blockchain developer communities - Advanced Technical Skills: - Experience with zk-SNARKs, zk-STARKs, or other zero-knowledge proof systems - Knowledge of cross-chain bridges and interoperability protocols - Familiarity with FHE (Fully Homomorphic Encryption) or advanced cryptographic primitives - Security Certifications: - Cryptography or blockchain security certifications - Experience with security audits and vulnerability assessments

BitFit Labs builds enterprise cryptocurrency wallets powered by advanced Multi-Party Computation (MPC) and Threshold Signature Scheme (TSS) technology. Their solution provides institutional-grade security for asset custody through distributed key management, supporting multiple blockchains including Bitcoin, Solana, Ethereum, and other EVM-compatible chains.