I'm Israel Ojiefoh. I engineer high-throughput transaction systems, double-entry ledgers with zero reconciliation drift, and production mobile applications.
Selected work
A focused look at the kind of work clients and teams care about: shipped interfaces, clear product logic, and maintainable engineering underneath.
A high-availability digital banking and embedded finance platform powering personal wallets, SME business accounts, peer-to-peer lending with automated repayment schedules, and utility bill payment APIs across iOS, Android, and web.
A comprehensive personal-growth and wellness ecosystem combining relationship matching, life coaching, licensed therapy access, curated wellness commerce, travel booking, events, luxury brands, gift cards, and affiliate rewards into one service marketplace.
A country-arrival platform that reduces relocation panic by turning visa rules, scam warnings, local systems, navigation, care passage, benefits, community, mentor matching, compliance reminders, and arrival glossaries into a trusted step-by-step path.
An African creator-brand partnership platform for campaign strategy, influencer discovery, niche filtering, verified metrics, direct communication, secure escrow payments, and milestone tracking from creator selection to approved payout.
Experience
2024 - Present
Engineered mobile banking and payment flows across iOS and Android, integrating wallet balances, automated P2P loan disbursements, and utility bill APIs with reliable transaction settlement.
April 2026 - Present
Leading cross-platform iOS and Android development with React Native and EAS release pipelines.
2024
Built a fashion-tech SaaS product around AI pricing and merchant workflow design.
2024 - 2025
Worked across tele-health and e-commerce systems using Nuxt, Express, PostgreSQL, and real-time messaging.
August 2024 - February 2025
Delivered feature implementation and cross-browser optimization in a distributed Agile team.
Product range
Mobile, SaaS, APIs
Team style
Remote-ready
About
I'm a Backend, Full-Stack, and Mobile Engineer currently driving high-concurrency backend microservices and cross-platform mobile initiatives at Devnnova, where I manage end-to-end deployment pipelines and client-server performance.
My architecture work centers on distributed systems, transaction integrity, and high-throughput API design. I specialize in building fintech transaction engines, double-entry financial ledgers, preventing race conditions with distributed locks, ensuring ACID database compliance, and integrating payment webhooks (Stripe, Paystack).
I've also lectured at Chrisland University, breaking down production ML workflows and distributed software architecture for the next generation of engineers.
Double-entry ledgers, race-condition safety, async worker queues, and idempotent payment webhooks.
Clean FastAPI & NestJS APIs, schema validation, microservices, and PostgreSQL query tuning.
Production React Native apps, CI/CD release paths, Docker containerization, and clean documentation.
Services
I can plug in at the product, frontend, backend, or release layer, then keep the implementation practical enough for a team to own.
High-concurrency API architectures, asynchronous event workers, double-entry financial ledgers, distributed Redis locking, idempotent payment webhooks, and race-condition-proof transaction pipelines.
Cross-platform iOS and Android apps with React Native, fluid native animations, offline sync, and bulletproof EAS release management.
Secure, scalable RESTful APIs and real-time systems using NestJS, Express, WebSockets, and performance-tuned PostgreSQL databases.
Multi-currency payment gateways (Stripe, Paystack), milestone escrow release mechanisms, B2B SaaS dashboards, and Shopify Apps.
Containerized microservices with Docker/Kubernetes, Redis caching layers, and automated CI/CD pipelines for high-availability deployments.
From concept to deployed production MVP — system architecture, high-concurrency API design, schema design, and frontend delivery.
Contact
Send a short brief and I will respond with the clearest next step, whether that is a build plan, an architecture review, or a focused implementation sprint.
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