Senior Software Engineer - Go

About Block Labs Block Labs is a leading force in the Web3 space, incubating, investing in, and accelerating top-tier fintech, crypto, and iGaming projects. With a mission to shape the future of decentralized technology, we partner with visionary startups to raise funding, refine product-market fit, and grow their audiences. As we continue to expand, we are looking for an ambitious and self-driven individual to join our rapidly growing team! About The Role We are developing a multi-tenant Cashier-as-a-Service platform, purpose-built for crypto. This platform provides a unified backend for managing deposits, withdrawals, balances, and settlements across multiple tenants, from exchanges and payment providers to decentralized apps. You’ll be joining a senior, highly technical team building greenfield backend services at the core of a secure, high-throughput financial platform. We value autonomy, craftsmanship, and long-term thinking, and we’re building systems designed for resilience, transparency, and scale. Key Responsibilities:

• Design and build distributed backend services that power a multi-tenant cashier and transaction management system.
• Develop core platform features for wallet orchestration, payment routing, reconciliation, and tenant onboarding.
• Integrate with blockchain networks, payment gateways, and third-party crypto APIs.
• Collaborate with product, frontend, and infrastructure teams to deliver reliable, end-to-end systems.
• Contribute to architectural design and drive technical decisions across services.
• Ensure scalability, fault-tolerance, and compliance within a regulated financial context.
• Maintain clean, testable, and well-documented Go code following industry best practices.

About You:

• 6+ years of experience in backend development, ideally in high-throughput or financial systems.
• Strong proficiency in Go as a primary backend language; experience with gRPC and RESTful APIs is highly valued.
• Solid understanding of distributed systems, multi-tenant architectures, and microservices.
• Experience with blockchain integrations, crypto custody, or payment rails is a strong advantage.
• Comfortable working in cloud-native environments.
• Deep commitment to software reliability, observability, and security best practices.
• Excellent communication skills and a collaborative mindset.

Nice to Have:

• Experience with cryptographic key management, wallet abstractions, or transaction signing flows.
• Background in fintech, DeFi, or crypto exchange infrastructure.
• Familiarity with event-driven systems, Kafka, or message queues.
• Prior experience designing APIs for multi-tenant or white-label products.

What kind of culture can I expect? Mature, mission-driven, and low-ego. We value clarity over noise, outcomes over theatrics, and pace without chaos. If you’re one of the smartest minds in your craft and want to build with other experts, you’ll feel at home here.