Staff Backend Engineer, Custody Core (Crypto Security)
SoFi · San Francisco +2 · 1mo ago
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The role
We are looking for a Staff Backend Engineer to help build the next generation of SoFi's digital asset custody platform. This engineer will design and develop the core services that power secure custody, blockchain transaction processing, wallet infrastructure, and institutional digital asset products.
This role sits at the center of crypto infrastructure, working closely with Security, Platform Engineering, Product, Treasury, and Operations to build highly available systems responsible for protecting customer assets.
The ideal candidate enjoys solving distributed systems problems, designing resilient APIs, and building financial infrastructure where security and reliability are first-class requirements.
What you’ll do:
- Design and build backend services supporting SoFi's digital asset custody platform
- Develop secure transaction orchestration services for deposits, withdrawals, transfers, staking, and treasury operations
- Build integrations with custody providers, blockchain infrastructure, and institutional settlement networks
- Design APIs supporting retail and institutional crypto products
- Develop services supporting wallet lifecycle management and blockchain interactions
- Improve platform resiliency through redundancy, disaster recovery, observability, and automated recovery mechanisms
- Optimize transaction throughput while maintaining strict security controls
- Build scalable event-driven architectures supporting blockchain state changes and transaction processing
- Partner closely with Security Engineering to implement cryptographic controls and authorization workflows
- Collaborate with Product and Infrastructure teams to deliver new digital asset capabilities
What you’ll need:
- 7+ years of backend software engineering experience
- Strong experience with applied cryptography, key management architectures (HSMs, KMS), or Multi-Party Computation (MPC) protocols.
- Proven experience building high-stakes financial transaction systems (e.g., trading engines, payment rails, digital asset wallets) with a zero-trust, security-first mindset.
- Strong understanding of blockchain fundamentals, transaction signing lifecycles, and wallet architecture.
- Strong experience with distributed systems and cloud-native architectures
- Experience building highly available production services
- Strong understanding of REST APIs, asynchronous messaging, and event-driven systems
- Experience with AWS or comparable cloud platforms
- Experience with PostgreSQL, Redis, Kafka, or similar technologies
- Strong understanding of CI/CD and modern software development practices
- Excellent debugging and production incident response skills
Nice to have:
- Experience working with digital assets or blockchain infrastructure
- Experience integrating with custody platforms such as Fireblocks, BitGo, or Anchorage
- Experience building financial services infrastructure
- Familiarity with blockchain transaction lifecycle and wallet architecture
- Experience designing secure approval workflows
- Understanding of distributed consensus and cryptographic systems
- Experience supporting institutional financial platforms