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
We're based in Huckletree, Liverpool Street for strong in-person collaboration, while embracing flexibility with best-in-class async tools.
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.
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What We Do
OpenCoreOS is the world’s first AI-native platform built to modernize global banking infrastructure. It provides a real-time, composable, and autonomous foundation that lets financial institutions operate and innovate at Tier-1 scale — across any cloud, geography, or asset type. By turning the core from a bottleneck into a catalyst, OpenCoreOS abstracts away the complexity of security, scalability, and resilience, enabling banks and fintechs to build and deploy bank-grade applications with speed and confidence.
Built on an unbreakable foundation and powered by MARS, its autonomous SRE system, OpenCoreOS delivers unmatched uptime, auditability, and resilience. Aligned with BIAN service domains, it provides banks with a real-time, compliant, and self-healing core. The Command Center – “Cursor for Banking” – unifies monitoring, compliance, and configuration through natural-language interaction, enabling teams to model products or migrate cores conversationally. Supporting fiat and digital assets, including stablecoins and tokenized deposits, OpenCoreOS powers the next era of programmable, intelligent, and unbreakable finance.
