Staff Backend Engineer — Crypto Custody Platform

SoFi; Seattle (WA); On-site; USD 180,000 - 240,000; Full time

Job summary

SoFi is seeking a Staff Backend Engineer to build the next generation of its digital asset custody platform in Seattle. You will design core services powering custody, transactions, wallet infrastructure, and institutional crypto products.

You will collaborate with Security, Platform Engineering, Product, Treasury, and Operations to create highly available systems that protect customer assets while meeting regulatory and reliability requirements.

Qualifications

• 7+ years of backend software engineering experience.
• 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 with digital assets or blockchain infrastructure.
• Familiarity with custody platforms such as Fireblocks, BitGo, or Anchorage.

Responsibilities

• 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.

Skills

Backend engineering

Distributed systems

Production services

REST APIs

AWS

PostgreSQL

Redis

Kafka

CI/CD

Debugging

Job description

SoFi is seeking a Staff Backend Engineer to build the next generation of its digital asset custody platform in Seattle. You will design core services powering custody, transactions, wallet infrastructure, and institutional crypto products.

You will collaborate with Security, Platform Engineering, Product, Treasury, and Operations to create highly available systems that protect customer assets while meeting regulatory and reliability requirements.