Member of the Technical Staff - Software Engineer

About OpenCoreOS

• A "Thin Ledger," not a thick core: We provide a hyper-performant ledger using Go, Rust, and multi-region distributed databases. This gives banks a simple, powerful, and open foundation to build on, not a monolithic cage

• AI-native by design: AI isn't an add-on; it's woven into our fabric. We use it to power autonomous operations, create agentic development workflows, and build an intelligent, self-healing system

• Unbreakable and open: We engineer for five-nines reliability and bulletproof consistency, targeting the scale of a Tier-1 bank managing hundreds of millions of transactions daily. By building on open technologies and shaping new standards, we ensure our platform provides a foundation for innovation, not another form of lock-in

• Backed by proven industry builders: Our leadership team combines the strategic insight of ex-McKinsey banking, product, and engineering experts with the battle-tested experience of a founder who built and scaled a mission-critical enterprise fintech company serving the world's largest banks. This is paired with the firsthand operational knowledge of former global bank CIOs, giving us an unparalleled understanding of the market we are redefining

What You Will Work On

• Ledger Engine: Deterministic, event-sourced transaction engine.

• Interest & Pricing Engine: High-precision financial calculations.

• Reconciliation Engine: Invariants, controls, and cross-ledger consistency.

• Operational Data Store (ODS): Real-time operational data plane.

• Scalability Layer: Concurrency, throughput, partitioning, and replication.

• AI-Native Dev Experience: MCP servers, agent workflows, and automated runbooks.

Core Responsibilities

• Build early MVPs for Tier-1 banks.

• Architect distributed systems with Go, Kafka, and distributed SQL DBs.

• Own systems across the full SDLC (coding, testing, DevOps, infra, product shaping).

• Implement advanced CI/CD and testing automation.

Essential Skills

• Language: Go

• Kafka / Event-driven systems

• Distributed systems, concurrency, and invariants

• GitOps

• Strong debugging, testing, and production ownership

• AI-Native Workflow: LLMs required daily

Nice-to-Haves

• Fintech/Banking experience

• Oncall / High-availability systems experience

• Multi-region systems exposure

Benefits Overview:

• 4 Weeks of PTO

• Medical & Dental Insurance

• Eligible for Sign on Bonus

• Pension

• Paid National Holidays

• Annual Bonus Eligibility

While our engineering hub is based in London, we have a growing presence in New York and are now hiring for this role in both locations.

Why join us?

• Massive impact: Transform how T1 banks handle billions of transactions daily—on a truly open platform.

• High-caliber team: Join a small team of exceptional engineers who value both speed and stability.

• AI-native workspace: Experience an AI-first environment with LLMs integrated into every tool.