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Kosiso Agbachi

Senior Flutter Developer & Mobile Engineer
📍 Port Harcourt, Rivers State, Nigeria
✉ dev@kosisoagbachi.com
↗ kosisoagbachi.com
↗ linkedin.com/in/specdev

Professional Summary

Result-driven Senior Flutter Developer & Mobile Software Engineer with over 6 years of experience engineering production-grade cross-platform applications for iOS and Android. Specialized in building scalable architectures, integrating state management systems (Bloc, Riverpod, Provider), and configuring complex CI/CD environments (Codemagic, Fastlane). Shipped 15+ apps supporting hundreds of thousands of active users with a consistent 99.5%+ crash-free session rate. Passionate about clean code, high performance, and collaborative agile problem-solving.

Technical Expertise

Mobile Development
Flutter, Dart, iOS (Swift, SwiftUI, UIKit), Android (Kotlin, Java), Native Bridges, MVVM Architecture, Clean Architecture.
State Management & DB
Bloc, Cubit, Riverpod, Provider, GetX, Hive, SQLite, Shared Preferences, Secure Storage.
Backend, APIs & Cloud
Node.js, PHP, RESTful APIs, MySQL, MySQLi, Firebase (Auth, Firestore, Storage, Cloud Messaging), Socket.io, Cloudflare.
Tools & DevOps
Codemagic, Fastlane, Git & GitHub, App Store Connect, Google Play Console, Postman, VS Code.

Professional Experience

Senior App Developer | Covax Consult
Sep 2022 – Present
Port Harcourt, Nigeria (Remote)
  • Led the development of multiple high-profile Flutter apps for iOS & Android from conceptual design to production deployment.
  • Designed and integrated MVVM Clean Architecture backed by Bloc/Cubit state management, improving code modularity and lowering regression bugs by 35%.
  • Collaborated with cross-functional design, product, and backend engineering teams to construct seamless RESTful API integrations and offline-first storage mechanisms.
  • Configured automated CI/CD build, test, and release pipelines using Codemagic and Fastlane, reducing manual deployment cycles from hours to minutes.
Back End Developer | Skyline ICT Consult Ltd
Mar 2020 – Present
Port Harcourt, Nigeria
  • Designed, built, and optimized scalable backend web services, APIs, and databases using PHP and MySQL.
  • Constructed secure and flexible REST APIs that interface with various web applications and mobile frontends.
  • Utilized Git for team collaboration and version control, maintaining repository health and codebase compliance.
  • Optimized query execution times and server caching to sustain high performance under load.
Full Stack Web Developer (Contract) | Rivers State Government
Oct 2025 – Nov 2025
Port Harcourt, Nigeria
  • Delivered the official digital transformation of riversstate.gov.ng, handling high public traffic requirements.
  • Developed customized CMS modules supporting MDAs, executive profiles, and live news syndication.
  • Implemented DDoS mitigation strategies and strict MySQLi security parameters to protect governmental public databases.
Web Developer | Xcel Media
Jun 2020 – Aug 2022
Port Harcourt, Nigeria
  • Designed, coded, and maintained responsive websites and client web applications using HTML, CSS, and modern JavaScript.
  • Managed local servers and internal IT services to support cross-functional operational staff.
  • Tuned frontend code layouts to improve rendering speeds and search engine optimization.

Education & Credentials

B.Sc. Computer Software Engineering
Federal University of Technology Owerri (FUTO)
2021 – 2025 | Owerri, Imo State, Nigeria
Grade: First Class Honours (1st Class Upper)
Application Development Certification
Udemy
Issued Aug 2022
Web Design and Development Certification
Loctech IT Training Institute
Issued Mar 2020

Key Projects Showcase

ItsTrendyMart E-Commerce Mobile App (Mobile / Flutter, Bloc, Firebase)

Constructed a luxury-focused shopping app from scratch and published it on both Google Play Store and Apple App Store. Features secure payment checkout, reactive shopping carts, dynamic search queries, and custom push notification alerts.

Rivers State Government Web Portal (Web / PHP, MySQLi, Cloudflare)

Redesigned and deployed the central government hub for riversstate.gov.ng. Designed custom content management models supporting dozens of sub-ministries and departments with heavy caching optimization for high load stability.