SoFi
Staff Backend Engineer, Custody Core (Crypto Security)
CA - San Francisco +7 · Staff · Full-time · Posted Jul 31, 2026
- Location
- CA - San Francisco
WA - Seattle
NY - New York City
TX - Frisco
UT - Cottonwood Heights
MT - Helena
FL - Jacksonville
CA - San Francisco - Experience
- 7+ years of backend software engineering experience.
About the job
Design and develop secure, reliable backend services for SoFi’s digital asset custody platform, including transaction processing, wallet infrastructure, and institutional crypto products.
What you'll do
- Build custody services, transaction orchestration, wallet lifecycle services, and APIs for retail and institutional products.
- Integrate custody providers, blockchain infrastructure, and settlement networks; implement cryptographic controls and authorization workflows.
- Improve availability, resiliency, observability, disaster recovery, and transaction throughput.
What they ask for
- Strong experience with applied cryptography, key management architectures (HSMs, KMS), or Multi-Party Computation (MPC) protocols.
- Experience building high-stakes financial transaction systems with a zero-trust, security-first mindset.
- Strong understanding of blockchain fundamentals, transaction signing lifecycles, and wallet architecture.
- Experience with distributed systems, highly available production services, APIs, messaging, cloud platforms, and CI/CD.
Nice to have
- Experience with digital assets or blockchain infrastructure.
- Experience integrating with custody platforms such as Fireblocks, BitGo, or Anchorage.
Tools
HSMs, KMS, MPC, REST APIs, AWS, PostgreSQL, Redis, Kafka
Model-written summary · the original posting is authoritative