DeFi Jobs

1. About BitFit Labs

We are building enterprise cryptocurrency wallet that combines advanced Multi-Party Computation (MPC) Threshold Signature Scheme (TSS) with an integrated local DEX aggregation engine.

This hybrid solution provides institutional-grade security for asset custody while enabling seamless, low-latency token swaps without relying on third-party APIs.

Core Features: 

- MPC TSS-based Wallet Infrastructure 

• 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 

- Local EVM DEX Aggregator Engine 

• Customized Geth Client: Modified Geth node with integrated DEX aggregator functionality 
• On-chain Liquidity Indexing: Direct indexing of liquidity pools from multiple DEXs (Uniswap, SushiSwap, Curve, etc.) 
• Local Swap Simulation: EVM-based swap simulation to calculate optimal routes, slippage, and pricing 
• Zero Third-Party Dependencies: All aggregation logic executed locally for privacy and reliability 
• Low-Latency Routing: Sub-second swap path discovery and execution

2. 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 

- DEX Aggregator Engine Development 

• Custom Geth Development: Build and maintain a modified Geth client with integrated DEX aggregator functionality for local swap routing 
• Liquidity Pool Indexing: Develop on-chain data indexing pipelines to track liquidity pools from major DEX protocols (Uniswap V2/V3, Balancer, Curve, KyberSwap) directly from event logs 
• Pool State Management: Parse and decode DEX pool states including reserves, fees, and tick data via customized Geth RPC or direct state access 
• Real-time Registry: Design and maintain a local pool registry that stays synchronized with the blockchain in real-time 
• Reorg Handling: Implement robust logic to handle blockchain reorganizations with rollback and re-indexing capabilities 
• Swap Simulation: Collaborate on EVM simulation integration to test swap routes locally before execution 

- 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 both MPC wallet operations and DEX aggregation 
• 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 

3. 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) 

- EVM Knowledge: Solid understanding of EVM, ABI encoding/decoding, and Ethereum event log parsing- Node Interaction: Experience interacting with Ethereum nodes (Geth, Erigon, or similar RPC clients) 

- DEX Protocols: Familiarity with at least 2 major DEX protocols; Uniswap V2/V3 AMM math knowledge is required 

- 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

4. 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 

- DeFi & Trading: 

• Experience with MEV bots, arbitrage systems, or existing DEX aggregators 
• Knowledge of graph-based routing algorithms for optimal swap paths 
• Familiarity with WebSocket subscriptions for real-time block/log streaming 

- 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