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Software Engineer · Nigeria

Linus Nnamdi Okolo

Software Engineer | Flutter Mobile App Developer | Web Developer | Cloud & DevOps Engineer | AWS | Azure | GCP | Datadog Observability | GitHub Action CI/CD | Docker | Kubernetes | Lambda.

Flutter · Web · Cloud ·& DevOps

Mobile App Samples
7+ Years Professional Experience
Multiple Professional Projects
$10 - $25 Up to 30hrs/week
Build → Test → Deploy Engineering Approach

About

Practical software across the application and infrastructure layers

I am a Software Engineer focused on building practical software across the application and infrastructure layers.

My primary development focus is Flutter and mobile application development, complemented by web development using HTML5, CSS3 and Vanilla JavaScript. I also have experience with cloud infrastructure engineering, server monitoring with Datadog, observability, Docker, AWS Lambda and Kurbernetes.

My work follows a clear engineering loop: Build → Test → Deploy → Monitor → Troubleshoot → Improve. I design systems that are maintainable, observable, and usable by non-technical stakeholders where required like:

  • Flutter mobile applications published and maintained on Google Play
  • Responsive websites with dependency-light, client-maintainable code
  • Cloud networking, compute, storage and security on AWS
  • Server monitoring, dashboards, alerts and incident investigation with Datadog and Slack channel / email
01 Build
02 Test
03 Deploy
04 Monitor
05 Troubleshoot
06 Improve

Expertise

Technical capabilities

Practical skills across mobile, web, cloud and DevOps infrastructure.

Mobile Development

Flutter Dashboard

Flutter & Firebase

Cross-platform mobile applications with production deployment and ongoing maintenance.

  • Dart language & Flutter framework
  • Provider / ChangeNotifier state management
  • Firebase Authentication & backend services
  • Hive local storage, Image Picker
  • Payment integrations (OPay, GPay)
  • Playstore published & updating
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Firebase and mobile backend

Flutter, Firebase & GCP

Cross-platform, authentication, and remote business analysis.

  • Firebase Authentication (email/password)
  • Cloud data storage for business forecast, product best selling days
  • User profiles and application data flows
  • Support for web & mobile backend needs
  • Low cost with maximum business & Ai backend supports
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Firebase and mobile backend

Flutter, Firebase & AWS

AWS multi-tier ubuntu server backend based app. S3 and auto scaling group managed.

  • Firebase Authentication (email/password)
  • Flutter, Firebase & Cloud API business tools integrations
  • User profiles and application data flows
  • Supporting large web & mobile backend needs
  • Uses ECR for professional backend analysis tools
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Web Development

HTML CSS JavaScript web development

Static . HTML5 · CSS3 · JavaScript

A Beautiful static Real Estate website, which implements necesaary contact details.

  • Semantic HTML5 structure
  • Responsive CSS layouts (Grid & Flexbox)
  • Vanilla JavaScript (ES6+) interactions
  • Business & landing pages for real estate companys
  • Forms, UI components, client-side functionality
  • Client / non developer easy to maintain.
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HTML CSS JavaScript web development

Investment . Responsive website

No dependencies and easy maintainable websites for Tech base companies.

  • Semantic HTML5 structure
  • Responsive CSS layouts (Grid & Flexbox)
  • Vanilla JavaScript (ES6+) interactions
  • Growing Tech business calcuated website.
  • Forms, UI components, client-side functionality
  • Basic contact details APIs.
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HTML CSS JavaScript web development

E-Commerce . Dynamic Websites

More Complex but basic static dashboard website for business monitoring and forecast.

  • Semantic HTML5 structure
  • Responsive CSS layouts (Grid & Flexbox); mobile & desktop perfect.
  • Vanilla JavaScript (ES6+) interactions
  • Local storage of some clients details in case they revisit within few weeks.
  • Dashboard, sales detials, etc.
  • Slight advance from non developer maintainability
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Cloud

AWS cloud infrastructure

AWS

Experience with networking, compute, storage, security and scaling AWS Windows, Linux, Suse, and Ubuntu server.

  • IAM and IAM identity center; Organizations and Federated Users.
  • VPC, Subnets, Route Tables, IGW, NAT Gateway, SG, etc.
  • EC2, Launch Templates, Auto Scaling Groups, etc.
  • Load Balancers, Target Groups, Security Groups
  • AWS Server monitoring with Datadog and Slack channel.
  • Cloud networking and infrastructure architecture concepts
  • A lot, you can view more.
View More
Microsoft Azure

Microsoft Azure

Foundational experience with identity and server environments.

  • Microsoft Entra ID
  • Azure tenancy and Resource management.
  • VPS / server environments
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Google Cloud Platform

Google Cloud Platform

Developing practical cloud knowledge. Good enough to manage it's Resources but not presented as production GCP expertise.

  • Building foundational cloud familiarity
  • Expanding practical cloud skills
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Observability

Datadog monitoring dashboard

Datadog

Server monitoring, metrics, logs, dashboards, monitors and Slack-integrated alerting.

  • Ubuntu & Windows host monitoring
  • CPU, memory, disk metrics
  • Log collection and dashboards
  • Monitors, alerts and incident investigation
  • Security breach alerting
  • Datadog → Slack alert integration
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DevOps & Automation

Docker containerization

Docker

Recently learned. Docker Engine & Desktop fundamentals, packaging and development environments.

  • Installation of Docker Engine on Ubuntu server.
  • Installation of Docker desktop on Windows PC.
  • Containerization concepts
  • Docker images and containers
  • Application packaging
  • Development environment use
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GitHub Actions CI/CD

GitHub Actions

Recently learned. CI/CD fundamentals, YAML workflows and repository automation concepts.

  • Workflow automation basics
  • YAML workflow structure
  • Automated build concepts
  • Testing and deployment automation ideas
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Kubernetes

Kubernetes

Recently learned. Kubernetes fundamentals.

  • List of resources learned.
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Lambda

Lambda

Recently learned. AWS Lambda fundamentals.

  • List of Resources learned
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Interactive

Command line

Type a command and press Enter. Try --help, skills, projects or whoami.

linus@portfolio — bash
Welcome. Type --help for available commands.
linus@portfolio:~$

Services

Few of what I can help you build

From mobile applications and websites to cloud setup and monitoring — practical engineering with clear deliverables.

Flutter Mobile App Development

Cross-platform mobile applications with authentication, state management, payments and Play Store deployment.

  • Flutter / Dart application development
  • Firebase & API integration
  • Publishing & maintenance on Google Play
View Samples &Hire me

Website Development

Responsive E-commerce websites, landing pages and real estate websites with clean, maintainable HTML, CSS and JavaScript.

  • Responsive layouts
  • Interactive UI & forms
  • Dependency-light, client-friendly code
View Samples &Hire me

Cloud Infrastructure

Cloud networking, compute and storage setup with a focus on AWS building blocks and secure architecture.

  • VPC, subnets, security groups
  • EC2, load balancing, auto scaling concepts
  • Organization / Federarted Users access control
View Samples &Hire me

AWS Infrastructure

AWS networking, compute, storage and security configuration for application hosting and infrastructure.

  • VPC design & connectivity
  • EC2, EFS, S3, load balancers
  • Security groups, IAM & IAM Identity center
View Samples &Hire me

Monitoring & Observability

Server and infrastructure monitoring with metrics, logs, dashboards and actionable alerts.

  • Host & infrastructure monitoring
  • Dashboards and monitors
  • Alert routing (e.g. Slack channel)
View Samples &Hire me

Datadog Monitoring

Datadog setup for Ubuntu/Windows hosts, metrics, logs, monitors and Slack / Email notifications.

  • Agent & integration setup
  • CPU, memory, disk monitoring
  • Datadog → Slack alerts
View Samples &Hire me

Server Monitoring

Monitoring of server resources and health with visibility into CPU, memory, disk and related signals.

  • Resource metrics
  • Log visibility
  • Alert configuration
View Samples &Hire me

Docker / Containerization

Container fundamentals, image packaging and development environment use. Recently learned; not claimed as large-scale production orchestration.

  • Dockerfile & image basics
  • Container runtime concepts
  • Application packaging
View Samples &Hire me

GitHub Actions / CI/CD Fundamentals

Workflow automation concepts, YAML workflows and repository-based automation. Recently learned.

  • Workflow structure
  • Build automation concepts
  • Repository CI/CD fundamentals
  • Publish Websites and Apps
View Samples &Hire me

Application Maintenance

Ongoing updates, fixes and improvements for published mobile applications and web projects.

  • Feature updates & bug fixes
  • Play Store / web maintenance
  • Dependency and compatibility updates
View Samples &Hire me

Projects

Tracked Projects.

Web Development

Selected freelance Done & Inprogress projects. Pure HTML5, CSS3 and Vanilla JavaScript, that is easy for client to maintain

Tabs Mobile Business

Business website built with HTML5, CSS3 and Vanilla JavaScript. Responsive layout and client-focused structure.

Freelance / inprogress · Web

Bonavee Real Estate Services

Real estate website with responsive design and interactive interfaces for property presentation.

Freelance / Done · Web

Oma Thrift Vendor

A female fashion brand website that display close to 20 samples. It is client easy to update.

Freelance / inprogress · Web

Cloud

AWS architecture demonstration

Simplified architecture showing networking, compute, load balancing, storage and security concepts. Presented as a portfolio demonstration of knowledge and not a claim that every component is running in a single production environment.

Cloud infrastructure visualization
Cloud infrastructure and network architecture
Internet
Internet Gateway
VPC · Subnets · Security Groups · IAM
Load Balancer
Target Group
EC2 / Auto Scaling
Storage (EFS / S3 / Volumes)

Also: Launch Templates, Key Pairs, NAT Gateway, Route Tables, AWS Organizations concepts.

Observability

From server to Slack

Practical experience with Datadog for host monitoring, metrics, logs, dashboards, monitors and Slack channel integrated alerts.

AWS multi-tier server with Datadog monitoring and slack alert demo
Server Ubuntu / Windows
Datadog host Agent · Metrics · Logs
Monitor CPU · Memory · Disk . Secuirty footage
Alert Thresholds · Conditions
Slack/Email Notifications
  • Server monitoring (Ubuntu and Windows)
  • CPU, memory and disk metrics
  • Log collection for security and dashboards for analysis
  • Monitors, alerts and incident investigation
  • Configured Datadog → Slack & Email alerts

Containerization

Docker

Fundamentals of packaging applications into containers for consistent development environments.

Application
Dockerfile
Docker Image
Container
Runtime

Focus: container fundamentals, development environments and application packaging. Not claimed as professional production container orchestration experience.

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Automation

GitHub Actions

CI/CD fundamentals and YAML workflow concepts for repository-based automation.

.github/workflows/
name: Build

on:
  push:
    branches:
      - main

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Build
        run: echo "Build application"

Illustrative workflow structure for demonstration. Not a claim that this exact pipeline runs in production.

View More

Experience

Professional timeline

November 9, 2023 - Present

Software Engineer

EarnDee Limited

  • Developing Flutter mobile applications and publishing to Google Play
  • Maintaining and updating published applications
  • Building separate Flutter apps for workers and administrators to manage company resources without programming knowledge
  • Developing responsive websites
  • Working with Firebase, API integration, authentication, payment integrations and application state management
  • Working with cloud infrastructure, server monitoring and troubleshooting

May 31st, 2026 - currently

Cloud & DevOps Engineer

Digital Witch support Community

  • AWS Cloud Resources(Multi tier server; Ubuntu, Windows, etc)
  • Azure Cloud Resources(Multi tier server; Ubuntu, Windows, etc)
  • Github Actions CI/CD pipeline
  • Docker, Kubernetes, Lambda, and Datadog Observability

Freelance / Project work

Web Development

Selected projects

  • Tabs Mobile Business — business website
  • Xander Elite Real Estate — real estate website
  • Bonavee Real Estate service — real estate website
  • Oma Thrift Vendor — Female clothes website
  • The Bar' Realtors — real estate website
  • Over 100 website with pure HTML5, CSS3, Vanilla JavaScript; responsive and client maintainable

Estimate

Estimate Your Project

Select one or more services. Figures are approximate starting estimates (indicative project ranges), not fixed quotations. Contact me for a tailored discussion.

Selected services

  • No services selected yet.
Estimated total (starting) ₦0

Approximate starting estimates · Not a formal quote

Approach

Why work with me

My App in playstore

It stands as a sitting evidence to my works. "The Aisle"

Years Of Experience

This created naturally Strong Security around my projects.

All in One engineering (Application + infrastructure)

Experience across mobile(java, dart & fluuter)/web development and cloud infrastructure, so solutions consider both product and operations.

Maintainability & Tranparent Coding

Preference for clear, dependency-light web solutions and structured Flutter apps so clients and teams can understand and maintain their project with little programming knowledge.

Monitoring & troubleshooting

Use of Datadog for metrics, logs, dashboards and Slack/email alerts to the appropriate department, so that issues can be detected and investigated fast and systematically.

Clear communication

Honest scope on skills (production vs. recently learned), clear estimates as ranges, and structured project discussion via contact.

I need a Job

Please, if there's vacancy, test my competency.

Contact

Start a conversation

Describe your project. Submitting will open WhatsApp with a pre-filled message so we can discuss next steps or rather schedule a time to discuss more.

Have a project in mind?

Let's build it — from application to infrastructure and monitoring.