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About BitFit Labs

BitFit Labs is building institutional-grade MPC wallet infrastructure for secure digital asset custody.

Our platform combines threshold cryptography, distributed signing architecture, and secure key management to provide highly secure and scalable wallet infrastructure for enterprises and digital asset platforms.

We support multiple blockchain ecosystems including Bitcoin, EVM-compatible chains, Solana, XRP, and TRON.

Our infrastructure is designed around:

• 2-of-3 MPC/TSS signing architecture
• Distributed key management
• Secure multi-party computation
• Multi-chain transaction orchestration
• Enterprise-grade operational security
• HSM-assisted signing environments

We are looking for experienced backend and wallet infrastructure engineers who are passionate about secure distributed systems, blockchain infrastructure, and applied cryptography.

Key Responsibilities

MPC / Wallet Infrastructure

• Design and implement secure distributed signing systems using MPC/TSS architectures
• Build highly available wallet infrastructure for institutional custody workflows
• Develop distributed key generation, signing, recovery, and rotation systems
• Improve operational security and resilience across wallet services
• Participate in architecture decisions around threshold cryptography and custody systems

Multi-Chain Integration

• Build and maintain wallet integrations for Bitcoin, Ethereum/EVM chains, Solana, XRP, and TRON
• Implement transaction construction, signing, broadcasting, and monitoring systems
• Develop internal abstractions for multi-chain wallet operations
• Optimize blockchain interaction reliability and performance

Backend & Platform Engineering

• Build internal APIs for wallet operations, balances, transaction workflows, and signing services
• Design scalable microservice architectures for high-availability systems
• Improve observability, reliability, and operational tooling
• Build high-performance event processing and blockchain indexing pipelines

Security Engineering

• Apply security best practices across wallet and signing infrastructure
• Integrate HSM solutions and secure execution environments where appropriate
• Collaborate on internal security reviews and operational hardening
• Contribute to incident prevention and recovery design

Requirements

Core Experience

• 5+ years of backend engineering experience
• 3+ years of professional Golang development experience
• Experience building production distributed systems or high-security infrastructure
• Strong understanding of microservice architecture and backend system design
• Experience with Docker, Kubernetes, and CI/CD workflows

Blockchain & Wallet Engineering

• Experience building blockchain wallet, custody, exchange, or payment infrastructure
• Strong understanding of blockchain transaction lifecycles and signing flows
• Familiarity with at least one major blockchain ecosystem:
  • EVM (Ethereum, Arbitrum, Polygon, BNB Chain, Avalanche)
  • Bitcoin
  • Solana
• Understanding of wallet standards such as BIP-32, BIP-39, and BIP-44

Security & Cryptography

• Familiarity with applied cryptography concepts including:
  • Elliptic Curve Cryptography (ECC)
  • Threshold signatures
  • Secure multi-party computation (MPC)
• Experience building or operating security-sensitive systems
• Strong engineering mindset around reliability, security, and operational safety

Nice to Have

• Production experience with MPC/TSS wallet systems
• Experience integrating HSM solutions (CloudHSM, YubiHSM, etc.)
• Familiarity with Ledger or Trezor integration workflows
• Experience with blockchain indexing or real-time event processing systems
• Contributions to blockchain open-source projects
• Knowledge of advanced cryptographic systems such as:
  • zk-SNARKs
  • zk-STARKs
  • FHE
• Experience with cross-chain infrastructure or interoperability protocols
• Security audit or vulnerability assessment experience

Tech Stack

• Golang
• Kubernetes / Docker
• Distributed systems & microservices
• MPC/TSS infrastructure
• Blockchain node integrations
• Cloud infrastructure
• HSM integrations

What We Value

• Strong ownership mentality
• Security-first engineering mindset
• Pragmatic problem solving
• Curiosity about distributed systems and cryptography
• Clear communication and collaborative engineering culture