Built for - A senior engineer for fintech startups
Money apps don't get to be \"mostly working.\" A rounding bug, a webhook that fires twice, or a KYC flow that stalls at step three, and you're either losing trust or losing money. You want a senior engineer who treats ledgers and payment edge cases like they matter, because they do.
- Payment integrations break in the edge cases. Retries, partial refunds, disputes, currency rounding. A junior ships the happy path and calls it done.
- Compliance and audit work (KYC/AML flows, audit logs, SOC 2 evidence) keeps getting pushed because nobody wants to own it.
- Reconciliation and double-entry ledger logic gets bolted on instead of designed, then drifts out of balance and nobody knows why.
- Webhooks from Stripe, Plaid, or your processor arrive out of order or twice, and idempotency was an afterthought.
What we build for Fintech startups
- A double-entry ledger with immutable transaction records, balanced debits and credits, and a reconciliation job that flags drift before your finance team does.
- Idempotent Stripe and Plaid webhook handlers with retry-safe processing, signature verification, and a dead-letter queue for failures.
- A KYC/AML onboarding flow wired to a provider like Persona or Onfido, with document upload, status polling, and manual review queues.
- ACH and card payment flows that handle the ugly states correctly: failed payments, partial refunds, chargebacks, and dunning retries.
- Append-only audit logging across every money-moving action, so you have clean evidence for SOC 2 and a real trail when something disputes.
- A treasury or balances dashboard that pulls live data from your processor and bank connections and stays correct under concurrent writes.
Why a subscription fits Fintech startups
Fintech weeks are brutal. A payments edge case is on fire Monday, a compliance deadline lands Wednesday, and an investor demo you promised is due Friday. A flat monthly subscription lets you reprioritize the instant things shift. No renegotiating a contract, no waiting six weeks to hire someone who clears a background check. Pause anytime when the queue goes quiet.
Frequently asked questions
- Do you handle compliance-sensitive work like KYC, AML, or audit logging?
- Yes. We build the engineering side. Onboarding flows wired to providers like Persona or Onfido, append-only audit logs, and the evidence trails your SOC 2 auditor asks for. We're engineers, not your compliance officer or legal counsel, so we build to the requirements you and your auditor define.
- Can you work with our payment processor and banking partners?
- Almost certainly. We've built against Stripe, Plaid, and the usual ACH and card rails, plus direct processor and BaaS APIs. If it has docs and a sandbox, we can integrate it. Idempotency, webhooks, and the failure states included, not just the happy path.
- How do you handle security with sensitive financial data?
- We work in your repos and your infrastructure with scoped, least-privilege access. We don't move your data anywhere, and we build with the boring fundamentals that actually matter: secrets management, encryption at rest and in transit, and audit trails on anything that touches money.
Built for teams like yours
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