Backend Engineer

sofi is a financial services company and national bank.

• Design and build backend services supporting the 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 with Security Engineering to implement cryptographic controls and authorization workflows.
• Collaborate with Product and Infrastructure teams to deliver new digital asset capabilities.

• 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, such as trading engines, payment rails, or 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; integrating with custody platforms such as Fireblocks, BitGo, or Anchorage; building financial services infrastructure; familiarity with blockchain transaction lifecycle and wallet architecture; designing secure approval workflows; understanding distributed consensus and cryptographic systems; supporting institutional financial platforms.

• The base pay range is not specified in the provided posting. Final base pay offer will be determined based on the candidate’s experience, skills, and location.
• Benefits are offered; details are available on the company’s benefits page.
• Remote work from Hawaii, Alaska, or Puerto Rico cannot be accommodated.