[sys] booting portfolio core...
[data] fetching profiles & projects...
[stack] resolving java & nestjs environment...
[network] connecting to arafi.yourara.com...
[status] systems fully operational.
Backend Engineer

I build systems that stay up, and products people keep coming back to.

Java & Spring Boot backend engineer with a founder's instinct for shipping — currently running production infrastructure for a live event platform, and building three more products behind the scenes.

Adedayo Adedeji Theophilus
Building

Shipped & in progress

4 active

MyMemori

production

Live event photo-sharing platform. Co-founder and backend lead — engineered dual payment routing between Paystack and Flutterwave using a factory pattern, HMAC-verified webhooks, idempotent transaction handling, and a Scrimage-based image processing pipeline. Used at live events with zero downtime.

Arafi

private beta

Payment logic-as-a-service, built on Nomba rails. Pitched live at Hackaholics (Wema Bank, Kano) — full Spring Boot + Kafka + Next.js architecture already spec'd and partly built, currently behind a waitlist while the core is finished.

Ara

private beta

An event OS for the African market, built around vendor accountability — closing the trust gap between event planners and vendors. Currently in private beta while the core product is validated.

Koder.quest

in build

A gamified web development learning platform for kids aged 10–16. AI tutor "Kira," mascot "Astro," and a full production-ready curriculum already written — platform hierarchy and architecture are locked, build is underway.

Experience

Build log

git log --oneline
e7a3b4

+Software Engineer at Emerj (Inventrix)

Dec 2025 – May 2026

Led system architecture and backend API development for a mission-critical SME inventory management platform. Directed a team of three developers, owning technical direction, database design, and code reviews.

a4f2c1

+Gig: Software Developer at Christ Apostolic Church (CAC) - International Youth Conference Abuja

July 2026 - Aug 2026

Engineered the user interface, registration workflow and admin portal for the International Youth Conference Abuja, coordinating check-ins and attendee analytics for over 1,000 participants.

5d92f8

+Team Lead at HNG Internship

Oct 2025 – Dec 2025

Led a team of 4 developers architecting a distributed microservices system. Built a notification microservice for email/SMS, maintaining 100% uptime through evaluation.

d3e1a9

+Data Automation Analyst (Volunteer) at GreenTree Capital

June 2024 – Dec 2024

Engineered an automated workflow reducing administrative overhead by 30%. Built dynamic Power BI dashboards for real-time KPI tracking, bridging technical and business stakeholders.

c02d88

+Open source, Stellar Drips Wave (Part-time) at Stellar Network

Jan 2026 – Present

Contributing to the Stellar ecosystem by building and documenting projects (Gaddaa, a crypto-to-fiat bridge, and Lancer) to keep the blockchain ecosystem active and supported within the local developer community.

About

Backend engineer. Product builder. Sometimes a teacher first.

I'm a self-taught backend engineer based in Nigeria. Java and Spring Boot are my home base, and I've since picked up NestJS for contract roles building enterprise applications. Outside of client work, I build my own products end to end: MyMemori is live and processing real images at real events; Ara, Arafi, and Koder.quest are further back but moving.

Before backend engineering became the solid plan, I was teaching. I taught at a secondary school where I taught Science subjects to students. I found it easy to explain complex concepts in a simple and understandable way, and I've carried that instinct into tech through volunteer instruction: teaching data analysis under 3MTT (a federal government tech-skilling initiative), and teaching Python, data science, and web development as part of Colab KD's talent pipeline programs. By the way, you can check out CoLab.

I care about shipping things that work under real conditions — not demos, production. And I'm building toward founding and scaling tech-related products out of Nigeria, not just working inside them.

Education
HND, Computer Science
Kaduna Polytechnic
2023–2025
Community & Teaching
Volunteer Instructor, Data Analysis
3MTT (federal government tech-skilling initiative)
Volunteer Instructor, Talent Pipeline Programs
Colab KD
Open Source Contributor (Part-time)
Stellar Network (Stellar Drips Wave)
Technical Stack
JavaSpring BootNestJSApache KafkaPostgreSQLSupabaseReact / Next.jsJavaScriptPower BIDocker
Contact

Let's talk.

Open to backend engineering roles — happy to walk through any of the above in more depth.