Blog | Olatunde Success

Engineer

Fintech · 7 min read

Field-Level Encryption in Nigerian Fintech: How I Protect BVN and NIN Data with AES-256-GCM

Olatunde Success explains the field-level encryption architecture he uses in production Nigerian fintech systems: why AES-256-GCM, how key rotation works with JWT auth, and what NDPA 2023 actually demands from engineers.

AI · 8 min read

Building Podus AI: Lessons from Shipping an AI Legal Assistant to 35,000+ Users

How Olatunde Success and the Citizens’ Gavel team shipped Podus AI, an AI legal assistant trained on Nigerian and UK law, across web, mobile, and WhatsApp, and what 6,500+ real legal interventions taught the team.

Fintech · 6 min read

Escrow Engines in Practice: What Building Dbrij Projects and Resikonet Taught Me About Trust

Olatunde Success on designing escrow-backed transactions twice, for Dbrij’s milestone-funded project management and Resikonet’s rental platform, and the engineering patterns that make escrow trustworthy.

NestJS · 5 min read

Idempotency Keys: The Cheapest Insurance in Money-Movement APIs

A practical guide by Olatunde Success to implementing idempotency keys in NestJS payment APIs: request hashing, response replay, race handling, and the failure modes that make them mandatory in fintech.

Fintech · 6 min read

From Ajo to API: Digitizing Nigerian Thrift Savings with Cirva

Olatunde Success on building Cirva, a cooperative savings (ajo/esusu) platform on NestJS with SafeHaven MFB virtual accounts, Paystack direct debit, and tiered KYC, without breaking the social trust that makes ajo work.

NestJS · 8 min read

One NestJS Monorepo, Three Fintech Products: How I Structure Dbrij, Cirva, and Resikonet

Olatunde Success walks through the NestJS monorepo architecture powering three production fintech products at SAW Technologies: module boundaries, shared domain libraries, per-product deployments, and the rules that keep one codebase from becoming one big ball of mud.

Payments · 9 min read

Integrating Nigerian Payment Rails: NUBAN Virtual Accounts, Direct Debit Mandates, and Card Issuing in Practice

A field guide by Olatunde Success to integrating SafeHaven MFB virtual accounts, Paystack direct-debit mandates, and Sudo Africa card issuing into a production NestJS backend, with the failure modes the documentation does not mention.

React Native · 7 min read

Shipping React Native Apps That Work on a ₦40,000 Android Phone

Olatunde Success on the performance playbook behind Cirva and PODUS mobile: budgeting for low-end Android devices, cutting startup time, taming bundle size, and designing for expensive data in the Nigerian market.

API Design · 6 min read

API Contracts and Schema Validation: How to Stop Shipping Breaking Changes

Olatunde Success explains the API contract discipline he introduced at Jobfactor and uses across SAW Technologies: schema validation at the boundary, contract checks in CI, and versioning rules that let frontend and backend teams ship independently.

Engineering Notes from Production