Senior Backend Engineer

We're creating the foundational backend systems that power private market access, from secure authentication and transaction processing to portfolio management and regulatory compliance.

We're looking for a Senior Backend Engineer to own the systems where money moves and balances have to be correct — the ledger, transaction processing, and the settlement and reconciliation workflows behind our platform. This is the correctness core of what we build. If a balance is wrong, a transaction double-processes, or a reconciliation silently drifts, nothing else we build matters.

You'll design the double-entry ledger, the money-movement engine, and the long-running state machines that carry complex financial workflows to completion reliably over hours, days, or weeks. You'll reason about idempotency, concurrency, partial failure, and replay as a matter of habit, not as an afterthought.

You'll own core infrastructure decisions and set the standard for how we build financial systems.

• Design and build the double-entry ledger and money-movement engine that all transactions reconcile against
• Model complex financial workflows as robust, observable state machines that run reliably over long periods
• Guarantee financial correctness under concurrency: idempotent operations, transactional integrity, and reconciliation that ties out to the cent
• Handle partial-failure and replay cases so no event is lost, duplicated, or applied twice
• Build secure, well-versioned APIs
• Design and optimize PostgreSQL schemas and data models
• Debug production issues and own the reliability of mission-critical financial workflows

• 5+ years of backend development on production systems
• Demonstrated money-movement correctness experience: you've built a ledger, settlement system, payments core, or transaction-processing system and can talk in detail about how you kept it correct
• Concurrency and idempotency depth: you can explain, from experience, how you handled double-processing, race conditions on balances, and replay
• Reconciliation experience: you've built or owned systems that had to tie out exactly, and you know what happens when they don't
• Strong TDD practices: you write tests first and maintain comprehensive coverage
• Domain-Driven Design expertise: you model complex financial domains accurately
• Deep PostgreSQL knowledge: schema design, transactions, isolation levels, optimization
• Strong in a modern backend stack: we work in TypeScript/Node.js, Go and on the JVM ecosystem; we value real depth in either and the range to pick up the other

• Startup mentality: comfortable with ambiguity, high autonomy, driving solutions without detailed specs

• Payments, banking, brokerage, or investment-platform systems experience
• Securities, custody, or portfolio/NAV domain knowledge
• Event-driven architectures and message queues
• Infrastructure as Code (Terraform, CloudFormation)
• Understanding of KYC/AML or compliance frameworks
• Accounting principles or financial modeling

Originally posted on Himalayas