Dennis Odalonu

I am a Software Engineer

About

My Journey so far

I didn’t get into software just to write code — I enjoy building things that solve real problems. With a strong academic foundation in Computer Science, I developed a deep understanding of systems and a passion for turning ideas into practical, user-focused solutions.

I began my professional journey as an Android engineer, building production-ready apps with Kotlin and modern architecture. That experience taught me what real-world development truly requires — handling edge cases, integrating APIs properly, and delivering reliable features for real users.

Over time, I’ve grown into a well-rounded engineer, focused on writing clean, maintainable, and scalable code. With MSc degrees in Computer Science and Advanced Computer Science (Distinction), I combine strong theoretical knowledge with hands-on experience across mobile and web. Today, I build polished, production-ready applications that are solid, thoughtful, and built to last.

Skills

A practical toolkit built through real-world projects and industry experience. From Android engineering to full-stack web development, these are the core technologies I use to design, build, and deploy scalable, production-ready applications.

Java

JavaScript

PHP

MySQL

Bootstrap

jQuery

Leaflet

Kotlin

Git

OpenCage

PHPMailer

Jetpack Compose

GitHub

Python

Curriculum Vitae

A concise overview of my development experience, technical strengths, education, and recent delivery impact. Download the full PDF CV below.

Summary

Dennis Odalonu

Software Developer with 3+ years of experience designing and delivering scalable backend services, API integrations, and data-driven applications across web and mobile platforms. Skilled in TypeScript, Node.js, Python, PostgreSQL, Redis, and cloud-native development, with a focus on performance, reliability, clean system architecture, secure software delivery, and production-ready engineering practices.

Technical Skills & Tools

Core competencies

Programming: TypeScript, JavaScript, Node.js, Python, SQL, Kotlin, Android Development.
Backend: RESTful APIs, Microservices, Express.js, BullMQ, Redis, JSON, API Integration
Databases: PostgreSQL, SQL Query Optimisation, Database Indexing, Connection Pooling, Data Modelling
Cloud & DevOps: Kubernetes, Docker, CI/CD, Git, GitHub, Prometheus, Grafana
Quality & Security: Unit Testing, Integration Testing, Code Reviews, Debugging, OWASP API Security

Education

MSc Advanced Computer Science (Distinction) — Cardiff Metropolitan University

2023 – 2024

Cardiff, UK

Postgraduate Certificate in Data Science / Machine Learning — Learning Saints Academy

2024

MSc Computer Science — University of Port Harcourt

2018 – 2021

Nigeria

BSc Computer Science — Novena University

2012 – 2015

Nigeria

Work Experience

Software Engineer / Back-end Platform — Plousios Gigantas

Jan 2026 – Present

United Kingdom

Develop and maintain scalable backend services, RESTful APIs, and cloud-native microservices supporting a high-availability B2B SaaS platform.
Engineered Redis and BullMQ distributed locking mechanisms, eliminating duplicate event processing across high-volume asynchronous workloads.
Optimised PostgreSQL performance through composite indexing and connection pool tuning, reducing API response times from over 4 seconds to under 500ms.

Technical Operations Assistant — County Hall

Aug 2024 – Apr 2026

United Kingdom

Maintained and validated 1,000+ digital asset records, improving data accuracy and reducing tracking discrepancies.
Resolved 25+ system and asset-related support requests each month, contributing to a 15% reduction in operational disruptions.
Produced operational reports and data extracts using Microsoft Excel and internal management systems to support planning and reporting.

Software Developer — Prunedge Technologies

May 2022 – Oct 2023

Nigeria

Developed and maintained responsive web and mobile applications across the software development lifecycle.
Integrated 15+ RESTful APIs and third-party services with robust validation and structured JSON parsing.
Diagnosed and resolved 60+ software defects through debugging, code reviews, and root cause analysis.

Junior Mobile Software Engineer — Decagon

Oct 2020 – Mar 2022

Nigeria

Contributed to the design, development, testing, and maintenance of mobile software applications within Agile Scrum teams.
Developed 20+ backend API endpoints and interactive UI components using JavaScript, Python, SQL, and RESTful services.
Implemented unit and integration testing, increasing automated test coverage by 35% and reducing defects during validation.

Certifications

Highlights

Scrum Fundamentals Certified
IT Career Switch Full Stack Development Program

References

Available upon request.

Download CV

Recent Projects Overview

Selected projects showing API integration, backend data handling, database-driven workflows, and production-focused software delivery.

Gazetteer

A full-stack geospatial application that combines interactive mapping with secure server-side API handling. Gazetteer uses PHP endpoints, AJAX workflows, and structured JSON responses to turn external country, weather, news, and geocoding data into a responsive user experience.

Leaflet Bootstrap jQuery PHP REST APIs JSON

Company Directory

A database-driven CRUD system for managing personnel, departments, and locations. The project focuses on reliable data workflows, server-side validation, dependency checks, duplicate prevention, and AJAX-driven filtering for fast administrative data management.

Bootstrap jQuery PHP (mysqli) MySQL CRUD Validation

Backend Platform Engineering

Backend platform work focused on distributed service reliability, asynchronous payment processing, API security, PostgreSQL performance tuning, and production delivery. The experience covers queue-backed workloads, retry behaviour, indexing, tenant-aware access control, CI/CD, and observability.

Node.js Redis BullMQ PostgreSQL CI/CD APIs

Overview

My backend experience has centred on services where correctness, latency, and operational reliability matter. In recent platform work, I have worked across Node.js and TypeScript services, REST API boundaries, asynchronous payment processing, PostgreSQL-backed data access, authentication and authorisation controls, CI/CD workflows, and production observability.

A major part of the work involved reducing failure modes in distributed backend flows. I used Redis and BullMQ patterns to coordinate asynchronous jobs, reduce duplicate event processing, and improve payment workflow reliability. I also worked on database access paths by tuning PostgreSQL indexes, queries, and connection pooling so high-traffic API calls could respond more predictably under load.

Beyond individual services, the work extended into production readiness: refresh token rotation, tenant-level authorisation, OWASP API security remediation, automated build and test workflows, Kubernetes health checks, Prometheus metrics, Grafana dashboards, structured logging, peer code reviews, and root-cause analysis for recurring defects.

Technical focus

Designed and maintained RESTful backend services using Node.js, TypeScript, Python, and structured JSON contracts
Implemented queue-backed processing with Redis and BullMQ to coordinate asynchronous workloads and reduce duplicate payment events
Improved transactional reliability with distributed locking, resilient retry logic, and safer background job execution
Tuned PostgreSQL performance through composite indexing, query optimisation, and connection pool adjustments
Strengthened API security with refresh token rotation, tenant-level authorisation checks, and OWASP API risk remediation

Delivery practices

Improved CI/CD reliability through automated build workflows, test refinement, and release-readiness checks.
Supported operational visibility with Kubernetes health checks, Prometheus metrics, Grafana dashboards, and structured application logs.
Used root-cause analysis, debugging, and peer code review to reduce recurring defects and improve maintainability.
Worked with engineers, DevOps, QA, and product teams to move backend changes safely through Agile delivery cycles.

Contact

Good software usually has a lot happening behind the scenes. That’s where I like to work: I like the parts of software users don’t always see: APIs, databases, integrations, background jobs, and the bits that keep products steady when real users show up. Let’s talk more.