I build secure, scalable web and mobile products for fintech, healthtech and edtech, and I'm growing into architecture and systems auditing.
I have 7+ years shipping production systems, and I'm available to start immediately. Depending on the team, I can sit in any of these seats:
| Role | What I bring |
|---|---|
| Full-Stack Software Engineer | End-to-end ownership with TypeScript, React/Next.js, NestJS/Node, PostgreSQL and MongoDB |
| Frontend Engineer | Role-based dashboards, admin consoles, multi-step wizards, and portal redesigns that lifted usability by 35% |
| Backend Engineer | Multi-tenant architecture, deny-by-default RBAC, JWT invalidation, double-entry ledgers, Paystack payment verification |
| Mobile Engineer (React Native, Expo, Flutter) | Cross-platform apps with offline resilience, Google 2FA, escrow flows and role-based multi-user experiences |
| Lead Engineer / Systems Architect | Led architecture of a 7-role ecosystem across Next.js, Flutter and NestJS |
| QA / Test Automation Engineer | Playwright, Detox, Jest, Postman, Sentry and Jira across web and mobile releases |
| Technical Product Manager | Roadmaps, KPI-driven decisions, specs, pitch decks and SWOT analyses that helped secure funding |
| IT Officer / Systems & Infrastructure | Deployments, database administration, access control, audit trails, and supporting non-technical teams |
| Architecture & Systems / Codebase Auditor | Access-control, data-integrity and architecture reviews; studying OWASP, ASVS, ISO 27001 and IT audit practice |
I'm a software engineer who cares about what happens after the UI is built: whether permissions hold up, whether money moves correctly, whether the system survives bad connectivity, and whether the next engineer can understand it.
- 🏗️ Architect multi-tenant, role-based platforms end to end
- 🔐 Design access control, session invalidation, audit logging and payment verification
- 📱 Ship web and mobile clients that share one reliable backbone
- 🧪 Test what I build with unit, API and end-to-end automation
- 🤝 Work well in remote, cross-functional teams and translate product vision into shipped features
Client and employer details are kept confidential; each project is described by what it does.
Setup wizard that enables modules per business type on one shared core, multi-branch support, granular staff permissions, a platform admin console, FIRS e-invoicing and offline resilience. Web and React Native.
PostgreSQL React React Native TypeScript
Patient records/EMR, scheduling and queues, pharmacy, lab, HMO/NHIA billing, admissions and telemedicine, with a React Native companion app.
React NestJS PostgreSQL Expo
Modular monolith with a department, role and user-override permission cascade, an employment-status state machine, JWT invalidation with live permission propagation and a double-entry general-ledger architecture.
NestJS MongoDB TypeScript
Led architecture and development of a multi-service platform (Next.js web, Flutter mobile, NestJS API) covering marketplace, accommodation booking, academy, emergency reporting, welfare requests, savings and soft-loan disbursement. Also built a private multi-franchise CRM with Inventory, Finance, HR and Audit Logs.
Next.js Flutter NestJS
Full-stack system for tracking materials across multiple sites, with role-based access, structured workflows and companion mobile apps. Reduced material loss and saved over ₦20M within four months of launch.
Next.js NestJS MongoDB React Native
Built a peer-to-peer exchange feature that held orders in escrow until buyers confirmed receipt, and strengthened security with Google Authentication (2FA).
React Native Fintech
Email engine with scheduled campaigns, CSV contact import with tagging, and a Paystack booking flow with a 30-minute hold verified server-side through Paystack's Verify Transaction API.
NestJS MongoDB Paystack Resend
Mobile apps exploring media-heavy workflows and turning a child's study notes into playable learning games.
Flutter React Native
Frontend
Mobile
Backend & data
Quality, monitoring & delivery
Also: Detox · Zustand · REST API design · Paystack · Google Authentication/2FA · RBAC · double-entry ledgers · Agile
I'm building a practical foundation in technology audit and application security: IT general controls, COBIT and ISO/IEC 27001, OWASP Top 10 and ASVS, secure code review and threat modelling. I'm turning what I learn into public write-ups.
I'm open to full-time roles, contracts and consulting engagements, fully remote and available immediately.
- 📧 Email: jafaruemmanuel48@gmail.com
- 💼 LinkedIn: linkedin.com/in/emmanuel-jafaru
- 🌐 Portfolio: emmyjaff.vercel.app
⚡ Fun fact: I play the bass guitar and squash, so I'm still human.