Jeffrey JolaJ

Senior software engineer & technical lead based in Lagos.

Currently
Independent consulting
Based in
Lagos · --:--:--

My story

Hi, I’m Jeffrey. For 8+ years I’ve been building and scaling SaaS, fintech, marketplace and booking platforms used by thousands of people across multiple industries. I specialise in Laravel, PHP, Vue.js, React and Livewire, API architecture and payment systems, and I’ve led high-volume transaction platforms from concept to production.

Contact me

Who I am

I turn business requirements into scalable technical solutions.

Evolution

I started out in 2018 teaching full-stack development and mentoring junior developers, several of whom went on to software engineering roles. Since then I’ve led teams and architected enterprise platforms from the first idea to production.

Approach

Performance, security and delivery speed. I optimise databases and backends, build PCI-compliant payment flows and design reusable architecture, so products ship sooner and keep running at scale.

By the numbers

Years of experience
8+8+
Building SaaS, fintech, marketplace and booking platforms.
Web applications delivered
50+50+
For startups, agencies and growing businesses.
Platform availability
99.9%99.9%
On payment infrastructure processing millions of transactions.

Experience

Full history on LinkedIn
  1. PayChangu 2024 — 2026 2024 — 2026Senior Software Engineer

    Payment infrastructure for a fintech platform processing millions of transactions.

    paychangu.com

    Laravel · PHP · React · MySQL · Payment APIs · Fintech Systems

    • 01Architected and enhanced payment infrastructure while maintaining 99.9% platform availability.
    • 02Reduced transaction completion times by 60% through database optimisation and backend performance improvements.
    • 03Designed scalable payment APIs supporting multiple gateways, currencies and third-party integrations.
    • 04Strengthened platform security with PCI-compliant payment workflows and secure transaction handling.
  2. Changu App 2026 2026Senior Software Engineer

    A multi-tenant operations hub for merchants, restaurant partners, logistics fleets and internal administrators.

    changu.app

    Laravel · React · Livewire · Real-time APIs · MySQL · Data Visualization

    • 01Built independent portal modules per business vertical: menus and live orders for restaurants, room availability for hotels.
    • 02Built real-time dispatch and monitoring interfaces with live telemetry for ride-hailing routes and delivery drivers.
    • 03Designed a financial and analytics suite with digital wallet tracking, utility billing reconciliation and automated multi-merchant payouts.
    • 04Architected real-time data tables and visualisations tracking sales, consumer metrics and fulfilment across 20,000+ app users.
  3. Krivi 2026 2026Senior Software Engineer

    A crypto-funded virtual Visa card app for spending stablecoins online, in store and on subscriptions worldwide.

    krivi.xyz

    Laravel · PHP · React · Crypto APIs · Fintech Integrations · MySQL

    • 01Integrated regional mobile money networks, including Airtel Money and TNM Mpamba, to load stablecoin wallets.
    • 02Owned the product lifecycle from core architecture and UX to cross-border forex checkout flows with no hidden spreads or weekend markups.
    • 03Designed instant card issuance, Apple Pay/Google Pay readiness and one-tap card freezing, scaling to 10,000+ users.
    • 04Built backend infrastructure for real-time transaction processing, global checkout conversions and 99%+ uptime.
  4. Ulinzinga 2024 — 2025 2024 — 2025Software Engineer

    An event management and ticketing platform with online payments and real-time seat selection.

    ulinzinga.com

    Laravel · Livewire · Payment Processing · MySQL

    • 01Built ticket checkout with online payment processing and real-time seat selection.
    • 02Developed administrative dashboards for attendee management, reporting and operational analytics.
    • 03Optimised platform performance for high-traffic events and concurrent user activity.
  5. Barbercita 2022 — 2025 2022 — 2025Technical LeadFull Stack Engineer

    End-to-end development of a booking platform deployed on iOS, Android and web.

    barbercita.com

    Laravel · Livewire · Mobile Apps · APIs · MySQL

    • 01Increased booking efficiency by 40% through UX redesign and workflow optimisation.
    • 02Designed scalable backend architecture supporting real-time scheduling and notifications.
    • 03Managed product delivery from requirements gathering through deployment and ongoing support.
  6. SignYourself 2022 — 2025 2022 — 2025Senior Software Engineer

    A multi-site SaaS platform for creating and managing websites from one unified dashboard.

    Laravel · SaaS · Multi-Tenant Systems · SEO

    • 01Built community features including user permissions, engagement systems and content management tools.
    • 02Implemented SEO and analytics capabilities to improve user visibility and platform adoption.
    • 03Designed reusable architecture supporting platform scalability and rapid feature development.
  7. Independent Consulting 2020 — Present 2020 — PresentSenior Freelance Software Engineer

    50+ custom web applications delivered for startups, agencies and growing businesses.

    Laravel · PHP · Vue.js · React · MySQL · REST APIs

    • 01Designed scalable software architectures aligned with client growth objectives.
    • 02Improved operational efficiency through workflow automation and custom business platforms.
    • 03Provided ongoing technical consulting, troubleshooting and platform optimisation.
    • 04Selected projects: fintech and payment platforms, booking and scheduling systems, community platforms, SaaS applications, marketplace solutions and website builders.
  8. Programming Instructor 2018 — 2020 2018 — 2020Freelance

    Full-stack development training programs, designed and delivered.

    PHP · JavaScript · Full-Stack Development

    • 01Designed and delivered full-stack development training programs.
    • 02Mentored aspiring developers through project-based learning.
    • 03Trained multiple junior developers who went on to secure software engineering roles.

Backend

Frontend

Data & infrastructure

Practice

What I do — Services

From the first requirement to production and beyond, I can own a platform end to end or step in at a single stage.

  • Web applicationsWeb applications
  • Payments & fintechPayments & fintech
  • API & system architectureAPI & system architecture
  • Booking & marketplacesBooking & marketplaces
  • Performance & scalingPerformance & scaling
  • Technical leadershipTechnical leadership