Founding Security Engineer
Flashnet is a Bitcoin-focused company building non-custodial trading and asset-routing products. Its offerings include a Bitcoin DEX, the Orchestra orchestration API, and USDB, a Bitcoin-native dollar stablecoin that pays rewards in BTC.
Funding history
About Flashnet
Flashnet builds modular, non-custodial exchange and liquidity infrastructure for Bitcoin. Its products serve wallets, exchanges, merchants, payout providers, and other teams that need to buy, sell, accept, settle, or route Bitcoin and stablecoins. Orchestra provides APIs for swaps, routing, bridging, settlement, payment links, reusable addresses, fiat onramps, and webhooks; Flashnet Markets provides native BTC trading on Spark; and USDB is a Treasury-backed stablecoin issued by Brale that rewards holders with Bitcoin.
Skills
About the Role
You will own security across critical production systems, from design through production. You will review architecture and code, identify attack surfaces, build fixes and security tooling, and strengthen practices for secure delivery. Your work will cover transaction signing, key management, cryptographic protocols, applications, infrastructure, and external-network integrations.
Requirements
- Demonstrate deep experience securing production software
- Demonstrate strong software engineering skills
- Read, review, and write production code
- Understand applied cryptography, authentication, key management, and secure protocol design
- Identify and exploit vulnerabilities
- Conduct security reviews
- Understand cloud infrastructure, networking, access controls, and distributed production environments
- Work across protocol, application, and infrastructure security
- Exercise sound security judgment and ownership
Responsibilities
- Secure core infrastructure, protocols, and transaction systems
- Review architecture and audit code
- Identify attack surfaces and vulnerabilities
- Design and implement security systems and fixes
- Develop security tooling
- Build internal security practices
- Secure transaction signing, key management, and cryptographic protocols
- Assess application, infrastructure, and external-network integration security