Backend Engineer, Custody Core; Crypto Security

Position: Staff Backend Engineer, Custody Core (Crypto Security)
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Who we are:

Shape a brighter financial future with us.

Together with our members, we’re changing the way people think about and interact with personal finance.

We’re a next-generation financial services company and national bank using innovative, mobile-first technology to help our millions of members reach their goals. The industry is going through an unprecedented transformation, and we’re at the forefront. We’re proud to come to work every day knowing that what we do has a direct impact on people’s lives, with our core values guiding us every step of the way.

Join us to invest in yourself, your career, and the financial world.

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 life cycles, 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, Bit Go, 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

Compensation…