Ezekiel Balogun Oluwatosin

Ezekiel Balogun Oluwatosin

Senior Full-Stack Software Engineer · CNCF Certified Cloud Native Associate (KCNA)

Architecting resilient, event-driven, cloud-native microservices and distributed REST/gRPC APIs at production scale—10K+ concurrent users, 1,000+ req/s throughput, and sub-200ms p99 latency. Real-time pipelines (WebSockets, Kafka), Redis caching, PostgreSQL, horizontal scaling, observability, and containerized CI/CD on Docker/Kubernetes. Python (Django/FastAPI) · TypeScript & Node.js (NestJS/Express) · React/Next.js · C++ for performance-critical paths.

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Professional Profile

Full-Stack Software Engineer and CNCF Certified Cloud Native Engineer with experience building scalable distributed systems and high-performance web and mobile applications. Delivered event-driven architectures handling 10K+ concurrent users and processing 1,000+ requests per second with sub-200ms API latency. Strong expertise in backend systems, real-time communication, microservices, API design, and cloud-native development using Python (Django/FastAPI), Node.js (NestJS/Express), React.js, and Next.js.

Follows the RESS (Reliable, Efficient, Scalable, Secure) engineering philosophy. Passionate about maintainable software systems underpinned by clean architecture, infrastructure-as-code, observability (Prometheus/Grafana), and secure CI/CD pipelines that drive continuous delivery.

Technical Skills

Expertise across full-stack development, cloud infrastructure, real-time systems, and modern web technologies

Backend Development

Python Django Django REST Framework FastAPI Node.js NestJS Express.js

Frontend Integration

Next.js React.js TypeScript SSR / SSG API Routes Token-Based Auth

JavaScript / TypeScript

JavaScript TypeScript Node.js NestJS Express.js Next.js React.js

Databases

PostgreSQL MongoDB SQLite Supabase Neon Database Modeling DBeaver

Real-Time & Messaging

Kafka WebSockets Socket.IO BullMQ Celery Redis Event-Driven Architecture

Authentication & Security

HTTP-only Cookie Auth JWT Authentication Firebase Auth CSRF Protection XSS Prevention

Cloud & DevOps

AWS (EKS, IAM, S3) Kubernetes / EKS Terraform (IaC) Docker / Docker Compose GitOps (Argo CD) CI/CD (GitHub Actions) Prometheus & Grafana

Architecture

Microservices Event-Driven Architecture REST API Design RESS Philosophy Clean Architecture

Testing & Debugging

Pytest Postman Django Debug Toolbar Structured Logging

Game Development

Godot 4 GDScript 2D Tilemaps Animation & Physics Newtonian Motion (Projectile Physics) Save/Load (JSON) AI & Gameplay

Tools & Platforms

Git OpenAPI/Swagger Cloudinary Alembic Prisma WebRTC

Work Experience

Building production-ready systems with secure architectures and scalable solutions

Backend Developer

Delphi EduHub — EdTech Learning Platform

2025 • Remote

Designed and built scalable backend systems for an EdTech platform enabling structured online learning, integrating seamlessly with a Next.js frontend.

Key Contributions & Achievements:

  • Built scalable EdTech backend serving 2K+ active users with optimized PostgreSQL queries reducing API latency to <180ms.
  • Designed secure authentication system using HTTP-only cookies and optimized enrollment workflows for high concurrency usage.
  • Integrated REST APIs with Next.js frontend and deployed using Docker CI/CD pipelines with Swagger documentation.
Django PostgreSQL HTTP-only Cookie Auth Next.js Docker Swagger

Live: delphieduhub.com

Backend Developer (Django)

Accessivo (incubated by Techitcheap), Ilorin

2025 • On-Site

Built and maintained backend services for a fintech platform. Responsible for API architecture, data modeling, security implementation, and integration of financial services.

Key Contributions & Achievements:

  • Developed fintech APIs handling 500+ daily transactions with real-time processing and optimized request latency to <200ms.
  • Integrated VFD Microfinance Bank APIs for fund transfers and Topupbox/Clubkonnect for airtime/data top-ups.
  • Deployed production systems on AWS with logging, monitoring, automated testing pipelines, JWT auth, and CSRF/XSS protection.
Django Django REST Framework PostgreSQL JWT Docker GitHub Actions AWS

Full-Stack Engineer

ArchsaintNexus — Health Mate (Digital Healthcare Platform)

2025 • Remote

Designed and implemented a full-stack digital healthcare platform supporting 1K+ users with telehealth, appointments, pharmacy, and lab booking systems.

Key Contributions & Achievements:

  • Built secure authentication using Firebase Authentication integrated with Django backend and HTTP-only cookies for stronger session security.
  • Implemented appointment booking, doctor search, time slot selection, and telehealth video consultations via Daily.co.
  • Developed secure access to prescriptions, test results, appointment history, lab booking, online pharmacy, and home healthcare requests.
  • Integrated Next.js frontend with Django REST APIs and optimized PostgreSQL performance.
  • Containerized services using Docker and managed cloud deployment with logging and monitoring workflows.
Django Next.js Firebase PostgreSQL HTTP-only Cookies Docker

Live: healthmate.archsaintnexus.com

Backend Developer (NestJS)

ArchsaintNexus • Remote

Recent • Remote

Designed and built scalable backend APIs using NestJS and TypeScript with a modular, production-ready architecture.

  • Built scalable RESTful APIs using NestJS with modular architecture and TypeScript.
  • Implemented CRUD operations with controllers, services, validation pipes, and structured routing.
  • Added error handling, middleware, and environment-based configuration for reliability and scalability.
NestJS TypeScript REST API Docker OpenAPI

Live: concierge.archsaintnexus.com

Backend Developer Intern (Django)

ArchsaintNexus — My Order Fellow (SaaS Order Tracking)

Recent • Remote

Contributed to My Order Fellow, a SaaS order-tracking backend integration project for e-commerce platforms.

Key Contributions:

  • Built RESTful APIs using Django and Django REST Framework for order ingestion, tracking, and updates.
  • Implemented webhook endpoints to receive and process order events from external e-commerce systems.
  • Integrated Celery and Redis for background task processing (webhooks, notifications, status updates).
  • Containerized the backend using Docker and Docker Compose; created GitHub Actions CI/CD workflows.
  • Set up Swagger/OpenAPI documentation, structured error handling, and logging for reliability.
Django DRF Celery Redis Docker Webhooks GitHub Actions

Links:

Freelance Developer (Pick-up Logistics)

Pick-up Logistics (archsaintnexus/pick-up-api)

Freelance • Remote

Built Pick-up Logistics API using TypeScript and Node.js — reliable order tracking and logistics workflow backend with API integration for a React.js frontend.

Key Contributions:

  • Implemented TypeScript/Node.js APIs for logistics tracking, status updates, and ETA calculations.
  • Built secure endpoints with JWT auth and input validation; enabled webhook processing for partner updates.
  • Deployed containerized services using Docker and integrated CI/CD pipelines.
  • Documented API contracts using OpenAPI/Swagger for frontend and mobile consumption.
TypeScript Node.js Express.js JWT Docker OpenAPI

Links:

Project Experience

Full-stack applications demonstrating clean architecture, real-time systems, and production-ready code

FEATURED

Fraud Detection System

React · NestJS · Kafka · Redis · BullMQ · WebSockets · PostgreSQL (PostGIS)

Real-time fraud detection system processing 1,000+ TPS with sub-150ms latency at scale.

Key Implementations:

  • Built real-time fraud detection processing 1,000+ TPS with sub-150ms latency using React, NestJS, Kafka, Redis, BullMQ, WebSockets, and PostgreSQL (PostGIS).
  • Designed scalable system handling 10K+ concurrent transactions using velocity checks, geo-spatial risk scoring, and Redis atomic counters.
  • Implemented event-driven architecture with Kafka + BullMQ, reducing processing bottlenecks by 60%.
  • Built real-time WebSocket alert system supporting instant fraud detection notifications under high load.
NestJS Kafka Redis BullMQ WebSockets PostgreSQL React
FEATURED

Novu — Real-Time Messaging System

Next.js · NestJS · Prisma · Redis · Socket.IO · WebRTC · AWS S3

Distributed messaging system supporting 5K+ concurrent users with <120ms message delivery latency.

Key Implementations:

  • Built distributed messaging system supporting 5K+ concurrent users with <120ms delivery latency using Next.js, NestJS, Prisma, Redis, TanStack Query, and Socket.IO.
  • Designed scalable chat infrastructure handling 100K+ messages/day with presence tracking and real-time updates.
  • Integrated WebRTC for voice/video calls and AWS S3 for media storage and delivery optimization.
  • Implemented BullMQ + Redis queues improving message reliability and throughput under high concurrency.
NestJS Socket.IO Redis BullMQ WebRTC Next.js AWS S3

Onyi Gifting Platform — Backend Developer

FastAPI | PostgreSQL | 2025

Rich-media anonymous gifting system with modular APIs and secure image/audio handling.

Key Implementations:

  • Designed modular RESTful APIs using FastAPI with clean architecture and JWT auth (token refresh + revocation).
  • Created conditional gift validation logic based on type (gift card, playlist, ask-out, etc.) with admin moderation filters.
  • Integrated Cloudinary for image/audio uploads with server-side file type, size, and transformation validation.
  • Used Alembic for schema versioning, PostgreSQL with DBeaver for schema design, and comprehensive pytest/httpx test coverage.
  • Built admin-only endpoints for gift status updates, user management, and resend_gift for WhatsApp/email delivery.
FastAPI PostgreSQL JWT Cloudinary Alembic Docker Pytest
GODOT

2D Adventure (Godot 4)

Godot 4 | GDScript | 2026

2D adventure prototype featuring animated movement, tilemap world building, parallax backgrounds, and save/load persistence.

Key Features:

  • Animated player with AnimationPlayer, sprite sheets, and physics-based movement (Newtonian motion + projectile mechanics).
  • TileMap + TileSet workflow for level design and collision mapping.
  • ParallaxBackground with mirror layers for seamless scrolling.
  • Save/load system using Godot File, JSON, and Dictionaries.
  • Simple AI mob using Area2D and state-based movement; collectables with pickup animations and UI feedback.
  • UI system: start menu, pause screen, and quit button with signal-driven logic.
Godot 4 GDScript 2D Games TileMap Save/Load AI

Outlier — AI Prompt Engineer

2025

Engineered context-aware prompts for system diagnostics, session summaries, and troubleshooting guides.

Key Contributions:

  • Engineered context-aware prompts for system diagnostics and DevOps troubleshooting guides.
  • Designed reusable prompt templates using few-shot and zero-shot prompting across multiple use cases.
  • Tuned GPT prompts for clarity, token efficiency, and technical accuracy; documented logic for cross-team adoption.
GPT Prompt Engineering LLMs

Education

B.Sc (Ed) Mathematics

University of Lagos

Sep 2019 – Sep 2025

Relevant Coursework: Algorithms, Probability & Statistics, Linear Algebra, Numerical Methods, Differential Equations, Discrete Mathematics

Certifications & Professional Development

KCNA: Kubernetes and Cloud Native Associate

The Linux Foundation (CNCF) — via Andela Learning Program

2026

Earned the KCNA certification through the Andela Learning Program, demonstrating foundational expertise in Kubernetes and cloud-native technologies.

Courses Completed:

  • LFS101 — Introduction to Linux
  • LFS158 — Introduction to Kubernetes
  • LFS250 — Kubernetes and Cloud Native Essentials (KCNA exam preparation)

Covers foundational Linux systems, containerization, Kubernetes architecture, cloud-native application design, and DevOps best practices aligned with CNCF standards.

Kubernetes Linux Cloud Native CNCF Container Orchestration

Let's Connect

Ready to collaborate on scalable backend systems, real-time architectures, or 2D game prototypes? Let's talk.

Get in Touch

Full-Stack Software Engineer focused on building reliable, scalable, and secure systems. Available for consulting, contract, and full-time opportunities.

Name: Ezekiel Balogun Oluwatosin
Email: ezekielbalogun56@gmail.com
Phone: +234 901 839 1336
Address: 7B, University Road Abule Oja | Lagos, Nigeria
Location: Available for Remote & On-Site

Specializations:

  • Scalable Backend System Design (Django, FastAPI, NestJS/Node.js)
  • Real-Time Systems (Kafka, WebSockets, Socket.IO, BullMQ)
  • RESTful API Development & Documentation
  • Database Architecture & Optimization (PostgreSQL, MongoDB)
  • Authentication & Security Implementation
  • Docker, Kubernetes & Cloud Deployments (AWS)
  • Microservices & Event-Driven Architecture

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