Senior Blockchain Engineer

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

1. 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

1. 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