Menu
Port Harcourt, Nigeria · Available for remote

Senior Flutter Developer.

Building production-grade iOS & Android apps with Flutter & Dart. Shipped 15+ apps with 300K+ downloads and a 4.5+ App Store rating.

View Work CV / Resume
6
Years of
Experience
15+
Apps
Shipped
300K+
Combined
Downloads
99%
Crash-Free
Sessions
Scroll
↓
01
About Me

Engineering mobile
experiences that last.

Hey there! I'm Kosiso Agbachi, a Senior Flutter Developer and Mobile Software Engineer with 6 years of experience building and scaling production-grade mobile applications for iOS and Android.

I work primarily with Flutter & Dart, with deep expertise in integrating Firebase, RESTful APIs, and managing app state using Bloc, Riverpod, and Provider. What I enjoy most is building things that last — apps that scale as products and teams grow.

I've worked closely with designers, backend engineers, and product managers in distributed, remote-first teams, turning complex requirements into intuitive, high-performance mobile experiences.

Core Strengths

Clean Architecture & MVVM design patterns
99.5% crash-free session rate across all apps
CI/CD pipelines with Codemagic & Fastlane
Cross-functional remote-first collaboration
State management: Bloc, Riverpod, Provider
Firebase integration: Auth, Firestore, FCM
Open to remote work — contract or full-time
6
Years
Mobile Dev
15+
Apps
Shipped
300K+
Combined
Downloads
4.5+
App Store
Rating
99.5%
Crash-Free
Rate
6
Total
Exp. Years
Kosiso Agbachi
Kosiso Agbachi Senior Flutter Developer · Port Harcourt, Nigeria 500+ connections · 8,700 followers
02
Experience

Where I've made
an impact.

App Developer
Covax Consult
Sep 2022 – Present3 yrs 7 mos · Full-time · CurrentPort Harcourt, Rivers State, Nigeria
  • Built and maintained multiple Flutter apps for iOS & Android, shipped to production.
  • Collaborating with cross-functional teams across design, product, and backend.
  • Implementing clean architecture patterns (MVVM, Bloc) for long-term maintainability.
  • Set up CI/CD pipelines using Codemagic and Fastlane for reliable, fast releases.
FlutterDartiOSAndroidFirebaseBloc

App Developer

Covax Consult

Now

Sep 2022 – Present · 3 yrs 7 mos

  • Built and maintained multiple Flutter apps for iOS & Android, shipped to production.
  • Collaborating with cross-functional teams across design, product, and backend.
  • Implementing clean architecture patterns (MVVM, Bloc) for long-term maintainability.
  • Setting up CI/CD pipelines using Codemagic and Fastlane for reliable, fast releases.
FlutterDartiOSAndroidFirebaseBloc

Back End Developer

Skyline ICT Consult Ltd

Now

Mar 2020 – Present · 5 yrs 7 mos

  • Developed backend systems and APIs for web platforms serving production clients.
  • Leveraged PHP, MySQL, REST APIs, and Git to deliver robust backend infrastructure.
PHPMySQLREST APIsGit

Full Stack Web Developer

Rivers State Government

Oct 2025 – Nov 2025 · 1 month · Contract

  • Delivered the official digital transformation of riversstate.gov.ng in partnership with EIT Solution Consults.
  • Developed dynamic CMS modules for MDAs, Executive profiles, and live news broadcasting.
  • Implemented DDoS protection and secure MySQLi interactions for government data.
PHPMySQLiJavaScriptCloudflare

Web Developer

Xcel Media

Jun 2020 – Aug 2022 · 2 yrs 2 mos

  • Designed, developed, and maintained web applications and websites for clients.
  • Managed IT services and support, ensuring seamless operations.
HTMLCSSJavaScript

Web Development Instructor

Opolo Global Innovation

Nov 2024 – Jan 2025 · 2 months · Contract

  • Trained students from Rivers State University on HTML, CSS, and JavaScript fundamentals.
  • Mentored a full cohort of students with hands-on instruction and practical projects.
HTMLCSSJavaScriptMentorship
03
Projects

Featured
work.

15+
Apps deployed
300K+
Combined downloads
4.5+
App store rating
99.5%
Crash-free rate
01
Web · Full StackOct – Nov 2025

Rivers State Government
Web Portal

riversstate.gov.ng

Role

Sole Full-Stack Developer

In partnership with EIT Solution Consults

Spearheaded the end-to-end digital transformation of the Rivers State Government's central web portal — the primary information hub serving millions of citizens statewide, built for zero-downtime high-volume public traffic.

⚡
Architecture & Scale

Custom PHP/JS infrastructure via Cloudflare for high availability & DDoS protection.

👥
Digital Governance

Dynamic CMS for MDAs, Executive profiles, and real-time state news broadcasting.

🔒
Security

Strict data handling protocols and secure MySQLi interactions for government data.

🌐
Accessibility

Optimized across all devices statewide — serving millions of citizens.

Stack

PHPMySQLiJavaScriptCloudflareHTML/CSSFull StackCMS
02
Mobile · FlutterAug – Nov 2025

ItsTrendyMart
E-Commerce App

E-Commerce Mobile App & Website

Role

Sole Mobile Developer

Independent project

Designed, developed, and deployed a full luxury-focused e-commerce shopping application as the sole Mobile Developer. Managed the entire lifecycle from design through dual-platform launch on both Google Play Store and Apple App Store.

🏪
Dual-Platform Launch

Full lifecycle from development through submission to both Google Play & App Store.

📱
Cross-Platform UX

Luxury-focused shopping experience with Flutter, consistent across iOS & Android.

🛒
E-Commerce Suite

Product catalog, cart, order management, payments, and user authentication.

📊
ASO & CI/CD

Optimized metadata, screenshots, and release pipeline via CI/CD tooling.

Stack

FlutterDartiOSAndroidFirebaseBlocApp StoreGoogle Play
View more projects ↗
04
Skills

My technical
arsenal.

📱 Mobile Development
Flutter95%
Dart95%
iOS (SwiftUI/UIKit)75%
Android (Kotlin)75%
⚙️ State Management
Bloc / Cubit92%
Riverpod85%
Provider88%
GetX70%
🔧 Backend & APIs
Node.js78%
PHP85%
REST APIs90%
MySQL / MySQLi82%
🔥 Firebase & Cloud
Firebase Auth90%
Cloud Firestore88%
Firebase Storage85%
FCM Push82%
🚀 DevOps & CI/CD
Codemagic82%
Fastlane78%
Git / GitHub90%
App Store Connect85%
🏗️ Architecture
Clean Architecture90%
MVVM88%
TDD72%
Design Patterns85%

Full Technology Stack

FlutterDartFirebaseNode.jsPHPMySQLBlocRiverpodProviderCodemagicFastlaneGitREST APIsCloudflareJavaScriptHTMLCSSClean ArchitectureMVVMCI/CD
05
Education

Academic
background.

Undergraduate Degree

B.Sc. Computer
Software Engineering

Federal University of Technology Owerri (FUTO)

1st Class Upper
  • 2021 – 2025 · Owerri, Imo State, Nigeria
  • Activities: Development & Software Engineering Society
  • Grade: 1-C Upper (First Class Honours)

Federal University of Technology, Owerri is a world-class institution focused on Science, Technology, and enterprise — operating across 9 countries.

Application Development

Udemy

Aug 2022

Comprehensive certification covering mobile and software application development practices.

View Certificate ↗

Web Design and Development

Loctech IT Training Institute

Mar 2020

Foundational certification in web design principles, HTML, CSS, and JavaScript development.

View Certificate ↗

English

Full Professional Proficiency

06
Contact

Let's build something
great together.

I'm open to remote roles — contract or full-time — and always happy to connect with teams building Flutter-powered products or innovative web solutions. Reach out and let's talk.

📍

Location

Port Harcourt, Rivers State, Nigeria

Available for remote roles worldwide

🕐

Availability

Open to Work

Contract or full-time positions

💬

Response

Within 24 hours

Monday – Friday

✉ Send an Email ↗ LinkedIn Profile
Kosiso Agbachi

Kosiso Agbachi

Senior Flutter Developer & Mobile Engineer

Available
500+
Connections
8.5K+
Followers
6+
Yrs Experience
15+
Apps Shipped
✉ Hire Me