FinTech & compliance-grade backends
I build systems where correctness beats cleverness: invoicing, document integrity, tax validation stages, and accounting integrations—with test suites and audit trails your compliance contact can reason about.
Public example patterns (under NDA for the full product) are in the B2B FinTech invoicing case study: canonicalization, hashing, signing, staged compliance checks, and ERP OAuth with parity on create/update paths. I usually partner with founders who already have legal/accounting input and need an engineer who can translate requirements into shipped services—not a pile of unmaintained scripts.
Where I add value
- Multi-tenant PostgreSQL modeling with clear boundaries between orgs and roles.
- Deterministic document pipelines (what was signed, when, and by whom).
- ERP integrations with retries, idempotency keys, and reconciliation hooks.
- Web admin + mobile (Expo/React Native) when the contract requires both surfaces.
- Milestone contracts with formal acceptance—reduces surprise scope on both sides.
FAQ
- Do you provide legal or compliance sign-off?
- No. I implement to the PRD and annex your counsel provides; you own regulatory posture.
- Which regions have you worked in?
- Example public work references AU GST-style flows; I can adapt patterns to other jurisdictions with your tax advisors.
- Pricing?
- See /pricing and the cost guide on the blog; FinTech milestones are usually larger than a simple SaaS CRUD app.