Software Engineer

FLY WING TECHNOLOGIES PTE. LTD.; Singapore; On-site; SGD 90,000 - 130,000; Full time

Job summary

BIT is hiring a Software Engineer focused on blockchain security and protocol design. You'll work at the intersection of cryptography, distributed systems, and adversarial security—redesigning and hardening wallet and core systems against protocol-level threats.

This builder role is for someone who thinks like an attacker and designs like an engineer, with duties in protocol analysis, security re-architecture, and hands-on audits to improve resilience.

Qualifications

• Bachelor's degree or above in CS, cryptography, or security.
• Fresh graduate or up to 2 years of relevant experience.
• Strong knowledge of distributed systems and security practices.

Responsibilities

• Protocol Analysis & Design: analyze blockchain protocols and redesign wallet systems grounded in secure cryptographic mechanisms.
• System Security Re-architecture & Hardening: drive security-driven re-architecture and hardening of existing software systems.
• Research, Audit & Response: track cutting-edge blockchain attack techniques and lead security audits and remediation.

Skills

Systems programming

Distributed systems

Java / Go / Rust / C++

Education

Bachelor's degree or above

Job description

About BIT：

BIT (formerly Matrixport) is a global digital asset financial services and infrastructure group. Headquartered in Singapore and founded in 2019, BIT bridges traditional finance and digital assets through governance-driven financial services and technology.

The firm manages over US$7 billion in assets and facilitates more than US$7 billion in monthly trading volume. BIT offers services including custody, trading, asset and wealth management, liquidity and financing solutions, and tokenised real-world assets (RWA), serving institutional and professional investors globally.

BIT Group entities maintain a licensed and regulated footprint across Singapore, Hong Kong, Switzerland, the United Kingdom, the United States and Bhutan.

For more information, visit www.bit.com

About the Role:

We're hiring a Software Engineer focused on blockchain security and protocol design. You'll work at the intersection of cryptography, distributed systems, and adversarial security — redesigning and hardening wallet and core systems against protocol- and architecture-level threats. This is a builder's role for someone who thinks like an attacker and designs like an engineer.

What You'll Do:

Protocol Analysis & Design

• Analyze and evaluate how mainstream blockchain protocols work under the hood (Ethereum/EVM, Cosmos SDK, Substrate, Solana, etc.), and redesign wallet systems grounded in secure cryptographic mechanisms.
• Develop hardening and mitigation plans for the wallet system against known protocol-level vulnerabilities and emerging risks.

System Security Re-architecture & Hardening

• Drive security-requirement-driven re-architecture and maintenance of existing software systems.
• Embed security assumptions at the architecture level, designing and implementing defense-in-depth for critical modules to reduce single points of failure and ambiguous trust boundaries.

Research, Audit & Response

• Track cutting-edge blockchain attack techniques and defenses, and turn research into shippable system improvements.
• Participate in or lead security audits of internal systems and open-source dependencies, driving remediation and architectural improvements.

Background & Experience:

• Bachelors degree or above preferred in Computer Science, Cryptography, or Network/Cyber Security.
• Fresh graduate or up to 2 years of work experience.

Core Technical Skills:

• Development & architecture: Strong command of at least one systems-programming language among Java / Go / Rust / C++. Proficient in distributed systems design, concurrency models, and performance optimization.
• Security domain knowledge: Familiar with threat modeling, secure coding standards, penetration-testing mindset, and supply-chain security.

Key Soft Skills:

• Security mindset & risk thinking: Operates on a "zero trust" principle by default and reasons systematically about attack surfaces.
• Analysis & abstraction: Translates complex, ambiguous security requirements into clear, verifiable technical architecture and module designs.
• Engineering craft & influence: Builds a security culture across the team through design docs, code reviews, and tech talks.

Preferred Qualifications:

• Deep understanding of the full technical stack of at least one mainstream blockchain (networking, consensus, execution, storage). Strong grasp of smart contract security and common vulnerability patterns.
• Practical command of how public-key cryptography, hash functions, zero-knowledge proofs, and threshold signatures apply — and where their risks lie — in real systems.

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