Evans AginaPortfolio / 2026
Building useful systems000%
Illustrated portrait of Evans AginaEvans
Agina
Available for select work
--:-- WAT

Hi, I’m Vance.Senior Full-stackEngineer.

(Scroll down & explore)
02

Professional snapshot

Operating across the stack

From product interface
to system architecture.

I work where ambitious product ideas meet production constraints—turning them into secure, scalable software that teams can operate and users can trust.

014+

Years building production software

0205

Global markets collaborated across

0304

Engineering disciplines connected

0403d

Built Yappper to hackathon recognition

Domains shipped
FintechHealthtechEdTechMediaSocialHumanitarian tech
03

Selected work

2025—2026

Selected systems,
built to hold up.

A focused selection of products where I owned architecture, delivery, or the difficult space between disciplines.

01Hackathon Winner · AI SaaS2026
Raenest × DevCareer · April 2026 · $3,000 prize pool

Yappper

A voice-first survey platform for collecting the emotion, context, and detail that one-word form responses leave behind—built and shipped in three days, then selected as a Raenest × DevCareer hackathon winner.

Full-stack & AI Engineer
Next.jsGeminiPolarClerkSupabase
Read case studyVoice-first research, shipped at hackathon speed
02AI Engineering · Healthtech2026

Joy / Rehabify Health

A multilingual WhatsApp care journey that turns a patient’s own words into safer intake, verified physiotherapist matching, booking, payments, and continued recovery support.

Backend & AI Engineer
GeminiTypeScriptPostgresWhatsApp API
Read case studyAI-guided care access with safety outside the model
03Humanitarian Impact · Backend Architecture2026

COFI Global Impact

A complete domain-driven backend for COFI’s global humanitarian ecosystem: projects, volunteering, partnerships, donations, geospatial impact, participation rewards, and shareable branded media—delivered in four weeks.

Backend Developer
NestJSMongoDBRabbitMQAWS
Read case studyHumanitarian participation and impact designed as connected domains
05Global Finance · Full-stack & Mobile2026

Casha Fintech

Engineering across Casha’s consumer finance app and its operational core: transaction monitoring, KYC remediation, access control, banking integrations, mobile delivery, and the public product website.

Senior Fullstack Engineer
TypeScriptRBACOpenAPIMobile
Read case studyConsumer finance backed by traceable operational systems
06Gospel Media · Full-stack Recovery2026

Neginawave

A coordinated recovery and expansion of a gospel-media platform for music, sermons, and podcasts across mobile, backend, creator tools, administration, streaming, payments, and analytics.

Fullstack Developer
ExpoNode.jsS3Paystack
Read case studyA gospel-media platform recovered across every product surface
07Midstream Energy · Web & IT Operations2026

Westflux

The digital platform and operating layer for a midstream energy company developing modular gas-processing infrastructure, customer calculators, and business-facing LNG, CNG, and NGL journeys.

Fullstack Developer & IT Support Engineer
WebZohoSecuritySEO
Read case studyA digital operating surface for a growing midstream energy company

Seven projects selected from a wider body of production work.

Each case study now opens into the architecture, decisions, and outcomes behind the product.
04

Project archive

Supporting work / 2023—2026

Beyond the featured work

More products.
More contexts.

A wider record of product, platform, and infrastructure work across different teams, industries, and stages of company growth.

ProjectContributionDisciplineYear
01Curriculo

AI resume platform & PDF pipeline

Full-stack / AI
02DataTechHub

Multi-role EdTech SaaS platform

Full-stack
03JAMI / NextBud

Social platform services, AI & performance

Backend / AI
04Giddaa Housing

Homeownership & payments platform

Frontend
05Huangliji

Ordering experience & live tracking

Frontend
06MenuJollof

Food ordering product delivery

Full-stack
07Spherical Systems

Operations admin dashboard

Frontend
08Inkwork Labs

Solana application integration

Backend / Web3
05

Core expertise

Four connected disciplines

Depth where it matters.
Range where it helps.

My range lets me see the complete system. My strongest contribution is making the architecture, implementation, and product experience work as one.

01

Backend engineering

Systems that stay understandable as they grow.

I design service boundaries, data models, access control, payments, background processing, and operational tooling for production platforms.

  • Domain-driven architecture
  • APIs & service contracts
  • Event-driven workflows
  • Authentication & RBAC
  • Payments & webhooks
  • Performance & observability
02

AI engineering

Intelligence with explicit boundaries and evidence.

I turn model capabilities into dependable product behavior through retrieval, structured decisions, context management, safety rules, and evaluation.

  • Conversational systems
  • RAG pipelines
  • Agent workflows
  • Deterministic guardrails
  • Structured AI decisions
  • Evaluation & monitoring
03

Web engineering

Fast interfaces connected to real product systems.

I build responsive user experiences, administration tools, design systems, and content platforms with performance and accessibility considered early.

  • Frontend architecture
  • Server rendering
  • Design systems
  • Accessibility
  • Performance optimization
  • Analytics & experimentation
04

Mobile engineering

Cross-platform experiences ready for real devices.

I integrate mobile applications with production APIs, stabilize native functionality, handle deep linking, media, and release workflows.

  • React Native & Expo
  • API integration
  • Deep & smart links
  • Native media playback
  • Authentication flows
  • EAS & TestFlight delivery
06

Technology constellation

Tools selected by purpose

A working toolkit, not a logo wall

Technology follows
the problem.

I choose tools for their fit, operational cost, team context, and ability to keep the system maintainable after launch.

01

Languages

  • TypeScript
  • JavaScript
  • Python
  • PHP
  • Java
  • Swift
  • C
02

Backend

  • NestJS
  • Node.js
  • Express
  • FastAPI
  • Spring Boot
  • GraphQL
03

Web & mobile

  • Next.js
  • React
  • Astro
  • Expo
  • Tailwind CSS
  • Shadcn UI
04

Data

  • PostgreSQL
  • MongoDB
  • MySQL
  • Redis
  • Firebase
  • Supabase
  • pgvector
05

Cloud & delivery

  • AWS
  • Docker
  • GitHub Actions
  • NGINX
  • Railway
  • CloudFront
06

Messaging & quality

  • RabbitMQ
  • Kafka
  • RocketMQ
  • Jest
  • Cypress
  • Sentry
07

About me

Abuja based / globally experienced
01Ownership02Clarity03Reliability04Curiosity
Evans Agina standing outdoors
Portrait / Evans Agina
Abuja, Nigeria · 2026

I’m Vance, a software engineer interested in the complete journey from an ambiguous problem to a dependable product.

Over the past four years, I have worked across fintech, health, education, media, social platforms, food technology, and humanitarian systems. That range taught me to move comfortably between product thinking, architecture, implementation, and delivery.

I have collaborated with teams across Nigeria, the United States, the United Kingdom, China, and India. I do my best work where the problem is complex, the outcome matters, and engineering decisions need to survive beyond the first release.

Foundation

B.Eng, Electrical & Electronics Engineering
University of Nigeria, Nsukka

08

Experience

2022—Present

A progression in responsibility

Closer to the system.
Closer to the outcome.

The titles changed. The direction stayed consistent: broader ownership, harder systems, and more responsibility for what reached production.

Frontend roles02 roles
01

DataTechHub · Giddaa · MenuJollof

Frontend & Fullstack Engineering

Shipped EdTech, housing, payments, analytics, and food-ordering product experiences.

Nigeria / Remote
02

Spherical · Inkwork · BlockLo · Manuel’s Rides

Engineering foundations

Built dashboards, API integrations, blockchain connectivity, and the frontend foundations of production products.

Remote
09

Engineering principles

How I make decisions

The operating system behind the work

Good systems are built
from clear decisions.

01

Start with the constraint.

The right architecture begins with the real user, business, team, security, and delivery constraints—not a fashionable pattern.

02

Keep boundaries explicit.

Clear domains, contracts, ownership, and failure modes make systems easier to change and safer to operate.

03

Design for failure.

Retries, idempotency, audit trails, observability, and graceful degradation belong in the design before production needs them.

04

Make tradeoffs visible.

Technical choices should have an explainable reason, known cost, and a clear signal for when they need to change.

05

Treat AI as a system component.

Models need context boundaries, deterministic safeguards, evaluation, fallbacks, and monitoring just like every other dependency.

06

Ship, measure, improve.

A useful production release creates evidence. That evidence should guide the next technical and product decision.

Useful over impressive.

Reliable over clever.

Evidence over assumption.

10

Engineering lab

Patterns under pressure

Experiments / Systems / Notes

The work behind
the finished work.

Small, concrete engineering patterns pulled from real products: what was tested, what shipped, and what I am still exploring.

01Shipped
Yappper

Three-day voice product

A complete voice survey loop using Gemini transcription, Supabase storage, Clerk authentication, and Polar billing.

  • Voice UI
  • Gemini
  • Product sprint
02In production
Joy / Rehabify

Deterministic safety matrix

Clinical red flags run through explicit rules before a probabilistic response is allowed to enter the conversation.

  • AI safety
  • Healthtech
  • Rules engine
03Exploring
TypeSafe / Jev

Shadow-mode AI decisions

Structured judgments run alongside existing logic, creating evidence before an AI decision is trusted in production.

  • Typed AI
  • Evaluation
  • Shadow mode
04Shipped
COFI

Event-driven brand pipeline

S3 events and Lambda jobs turn project media into branded assets without adding latency to the main request path.

  • AWS
  • Events
  • Media
05Designed
Stradha

Grounded virtual waitress

Bedrock and vector retrieval connect conversational food recommendations to current restaurant and menu data.

  • RAG
  • Bedrock
  • pgvector
06Recovered
Neginawave

Secure range streaming

Time-limited media access and partial-content responses make private audio seeking reliable across mobile networks.

  • S3
  • HTTP range
  • Expo
11

Writing & insights

All field notes ↗

What the build
taught me.

Short essays on AI boundaries, backend architecture, and shipping complete products under real constraints.

01
AI systems

Safety before language models

What a health assistant taught me about placing deterministic systems around probabilistic intelligence.

6 min
02
Backend architecture

Architecture under a four-week clock

How I turned a broad humanitarian platform into domains, queues, and a delivery map.

5 min
03
Build notes

Shipping a voice product in three days

The product choices behind Yappper, an AI survey platform and Raenest × DevCareer hackathon winner.

4 min
12

Start a conversation

Abuja · WAT
Have a difficult system to build?

Let’s make it
hold up.

Available for select senior engineering, technical leadership, and AI product engagements.

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