Ezekiel Balogun Oluwatosin

Ezekiel Balogun Oluwatosin

Full-Stack Software Engineer · CNCF Certified Cloud Native Engineer

Designing and migrating both monolithic and microservices architectures, event-driven systems, and data pipeline integrations at production scale — 10K+ concurrent users, 1,000+ req/s, and sub-200ms API latency. Experienced in ETL/ELT workflows, dimensional modeling, SQL Server transaction management, data structures and algorithms, and DevOps-driven data engineering using Python, Node.js, React.js, Apache Kafka, dbt, and Apache Airflow.

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Professional Profile

Results-driven Full-Stack Software Engineer and CNCF Certified Cloud Native Engineer with a proven track record building scalable fintech, healthcare, and EdTech platforms. Specialises in designing and migrating both monolithic and microservices architectures, event-driven systems, data pipeline integration, partitioned database architecture, and transactional data integrity supporting 10K+ concurrent users, 1,000+ requests per second, and sub-200ms API latency.

Experienced with ETL/ELT workflows, dimensional modeling, SQL Server transaction management, structured error handling, data structures and algorithms, DevOps-driven data engineering, and cloud-native tooling using Python, Node.js, React.js, Apache Kafka, dbt, and Apache Airflow.

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, data engineering, and real-time systems

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

Databases

PostgreSQL MongoDB SQL Server SQLite Supabase Database Modeling Database Partitioning Dimensional Modeling Star & Snowflake Schema normalization (1NF–6NF)

Data Engineering & Pipelines

Apache Airflow dbt (data build tool) Apache Spark AWS Glue Fivetran Debezium (CDC) ETL/ELT Pipelines

Transaction & Error Handling

Transaction Management TRY/CATCH Error Handling Deadlock Handling Savepoints & Rollbacks XACT_ABORT Concurrency Control

Data Structures & Algorithms

Arrays & Linked Lists Stacks & Queues Trees & Graphs Sorting & Searching Dynamic Programming Big O Complexity

Real-Time & Messaging

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

Authentication & Security

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

Cloud & DevOps

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

Architecture

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

Testing & Debugging

Pytest Postman Django Debug Toolbar Structured Logging

Tools & Platforms

Git OpenAPI/Swagger Cloudinary Alembic Prisma WebRTC DBeaver

Work Experience

Building production-ready systems with secure architectures and scalable solutions

Backend Developer

Delphi EduHub — EdTech Learning Platform

2026 • 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:

  • Powered an EdTech platform for 2,000+ students and instructors by designing a normalized PostgreSQL database schema using star and snowflake modeling, cutting query times and ensuring clean, consistent data across the platform.
  • Optimised platform performance by applying efficient data structures (trees, queues, hash maps) and algorithmic techniques, reducing redundant computation and improving overall system response times.
  • Eliminated unauthorized access risks by designing RBAC workflows, enabling safe multi-role platform usage across students, instructors, and admins.
  • Collaborated closely with the frontend team to align API contracts and data structures with Next.js requirements, accelerating feature delivery and reducing integration bugs across the platform.
NestJS PostgreSQL & MongoDB Star & Snowflake Schema RBAC Data Structures Next.js Docker

Live: delphieduhub.com

Contract Backend Developer

Accessivo (Techitcheap) — Fintech Platform

July 2025 – Dec 2025 • Ilorin

Built and maintained backend services for a fintech platform. Responsible for API architecture, transaction management, data pipeline automation, and integration of financial services.

Key Contributions & Achievements:

  • Processed 500+ daily financial transactions securely by engineering fintech APIs with atomic SQL Server transactions (BEGIN, COMMIT, ROLLBACK) and TRY...CATCH error handling, ensuring zero data corruption across payment workflows.
  • Improved data pipeline reliability by applying DevOps practices — containerizing workflows with Docker, implementing CI/CD for data jobs, and adding observability layers — reducing pipeline failures and accelerating deployment cycles.
  • Dropped request latency by 35% through optimized database interactions and service architecture, keeping response times consistently below 200ms.
  • Worked cross-functionally with the product and QA teams to prioritize payment workflow fixes, ensuring critical transaction bugs were resolved before release cycles.
Django SQL Server Transaction Management Apache Airflow ETL Pipelines Docker AWS

Full-Stack Engineer

Archsaint Nexus — HealthMate (Digital Healthcare Platform)

2025 • Remote

Designed and implemented a full-stack digital healthcare platform supporting 1,000+ users with telehealth, appointments, pharmacy, and lab booking systems.

Key Contributions & Achievements:

  • Expanded healthcare access for 1,000+ patients by building a telemedicine platform with appointment scheduling, pharmacy management, and HIPAA-compliant video consultations via Daily.co.
  • Strengthened system reliability by integrating DevOps-driven data pipeline monitoring and deploying optimized graph and queue-based data structures to manage patient appointment scheduling efficiently at scale.
  • Safeguarded critical patient data integrity by implementing savepoint-based transactions and deadlock handling strategies, preventing data loss during concurrent database operations.
  • Partnered with designers, and healthcare stakeholders to iteratively ship telemedicine features, maintaining clear documentation and API contracts across all teams.
Django Next.js Firebase Debezium CDC Deadlock Handling Savepoints Docker PostgreSQL

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.
  • Collaborated with frontend and DevOps teams to align API versioning, deployment configurations, and OpenAPI documentation, ensuring smooth cross-team integration.
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.
  • Actively participated in team code reviews, contributing feedback on API design patterns and error handling standards that improved overall codebase consistency.
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.
  • Maintained clear communication with the client and React.js frontend developer throughout the project, delivering API documentation and changelogs that kept both parties aligned at every stage.
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:

  • Protected financial operations by processing 1,000+ transactions per second at sub-150ms, catching fraud before it impacts users.
  • Reduced data bottlenecks by 60% using Apache Kafka for async event processing, keeping the system stable under high load.
  • Delivered instant fraud alerts to operations dashboards via a low-latency WebSocket system, enabling faster human response.
NestJS Kafka Redis BullMQ WebSockets PostgreSQL React
FEATURED

Novu — Real-Time Messaging Platform

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

Distributed messaging platform supporting 5,000+ concurrent users with sub-120ms message delivery.

Key Implementations:

  • Enabled real-time communication for 5,000+ concurrent users with sub-120ms message delivery, powering seamless conversations at scale.
  • Handled 100,000+ daily messages reliably using Redis and BullMQ background processing, keeping the platform available even under peak load.
  • Enhanced user experience with live presence tracking, typing indicators, and WebRTC voice/video calling.
NestJS Socket.IO Redis BullMQ WebRTC Next.js AWS S3
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.
  • TileMap + TileSet workflow for level design and collision mapping.
  • Save/load system using Godot File, JSON, and Dictionaries.
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.
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 & Courses

KCNA: Kubernetes and Cloud Native Associate

The Linux Foundation (CNCF) — via Andela Learning Program

2026

Completed LFS101, LFS158, LFS250 covering Linux systems, Kubernetes architecture, and cloud-native application design.

Kubernetes Linux Cloud Native CNCF

Database Design & Dimensional Modeling

DataCamp

2026

Designing and structuring analytical databases using star and snowflake schemas, normalizing tables from 1NF to 6NF, and querying multi-table data warehouse schemas to extract meaningful business insights.

Star Schema Snowflake Schema Normalization Data Warehouse

Transactions & Error Handling in SQL Server

DataCamp

2026

SQL Server transaction management (BEGIN, COMMIT, ROLLBACK), savepoints, TRY...CATCH structured error handling, deadlock detection and resolution, XACT_ABORT, error functions, and concurrency control — applied to building fault-tolerant, data-consistent backend systems.

SQL Server Transactions TRY/CATCH Deadlock Handling

Data Structures & Algorithms

DataCamp

2026

Core data structures including arrays, linked lists, stacks, queues, trees, and graphs, alongside algorithmic techniques such as sorting, searching, recursion, dynamic programming, and Big O complexity analysis — applied to writing efficient, optimized backend code.

Data Structures Algorithms Dynamic Programming Big O

Data Engineering Implications of the DevOps Architecture

DataCamp

2026

The intersection of data engineering and DevOps — covering CI/CD pipelines for data workflows, infrastructure as code, containerized data pipeline deployment with Docker, monitoring and observability for data systems, and how DevOps practices improve reliability and scalability of data engineering architectures.

DevOps CI/CD for Data Infrastructure as Code Data Observability

Let's Connect

Ready to collaborate on scalable backend systems, data engineering pipelines, or real-time architectures? 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)
  • Data Engineering & ETL/ELT Pipelines (Airflow, dbt, Fivetran)
  • Database Architecture, Dimensional Modeling & Optimization
  • Transaction Management & Error Handling (SQL Server)
  • Authentication & Security Implementation
  • Docker, Kubernetes & Cloud Deployments (AWS)
  • Microservices & Event-Driven Architecture

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