John Kargbo
AVAILABLE FOR NEW PROJECTS

Engineering digital
experiences that scale

From concept to production — I architect, design and build high-performance applications that drive real business outcomes.

Explore ServicesView Process
6
Services
16
Technologies
GMT
Time Zone
24h
Response Time

Services built for scale

Every engagement follows engineering best practices — type safety, performance budgets and production readiness from day one.

Web Development

FULLSTACK
01

High-performance web apps with React, Next.js and a type-safe API layer.

Server-side rendering & ISR
Progressive Web App (PWA)
Performance optimization (Lighthouse 95+)
SEO architecture & structured data
ReactNext.jsTypeScript

Mobile Apps

FULLSTACK
02

Cross-platform iOS & Android apps that feel native and ship fast.

Cross-platform iOS & Android
Native module integrations
Offline-first architecture
React NativeExpo

UI / UX Design

DESIGN
03

Research-led interfaces, prototypes and design systems in Figma.

User research & persona development
Wireframing & interactive prototypes
Design system creation
FigmaDesign Systems

API & Backend

BACKEND
04

Robust REST & GraphQL APIs, databases and auth done right.

RESTful & GraphQL API design
Database schema optimization
Authentication & authorization (OAuth, JWT)
Node.jsLaravelPostgreSQL

DevOps & Cloud

DEVOPS
05

CI/CD pipelines, containers and zero-downtime deploys on AWS.

CI/CD pipeline automation
Docker & Kubernetes orchestration
Infrastructure as Code (Terraform)
DockerAWS

Consulting

FULLSTACK
06

Architecture reviews, code audits and technical mentoring.

Architecture review & recommendations
Code quality audit & refactoring plan
Performance bottleneck analysis
AuditsMentoring

A proven process, every time

Six phases from discovery to launch — each with clear deliverables and your approval.

01

Discovery

We define goals, scope and success metrics together.

02

Strategy

Technical architecture and project roadmap with clear milestones.

03

Design

Wireframes and prototypes you can click before any code.

04

Development

Iterative sprints with weekly demos and live previews.

05

Testing

QA, performance audits and accessibility validation.

06

Launch

Deploy, monitor and hand off with full documentation.

Technologies I work with

A curated stack chosen for reliability, performance and developer experience.

JavaScript
TypeScript
React
Next.js
Node.js
Laravel
Angular
Vue.js
PostgreSQL
MongoDB
GraphQL
Redis
Docker
AWS
Tailwind
Firebase
JavaScript
TypeScript
React
Next.js
Node.js
Laravel
Angular
Vue.js
PostgreSQL
MongoDB
GraphQL
Redis
Docker
AWS
Tailwind
Firebase

Frontend

JavaScriptTypeScriptReactNext.jsAngularVue.jsTailwind CSS

Backend

Node.jsLaravelGraphQLPostgreSQLMongoDBRedis

Cloud & DevOps

DockerAWSFirebase

Frequently asked questions

What's your typical project timeline?+
Most web apps ship in 4–8 weeks depending on scope. I work in weekly sprints with a live preview after each one, so you always see progress.
Do you work with existing teams?+
Absolutely. I slot in as a senior engineer — pairing, reviewing PRs and unblocking — or lead a build end-to-end. Whatever your team needs most.
How do you handle pricing?+
Fixed-scope projects are quoted up front; ongoing work runs on a monthly retainer. No surprise invoices, and you can cancel a retainer anytime.
What happens after launch?+
Every project ships with documentation and a handoff call. I also offer maintenance retainers for monitoring, fixes and new features.
Which time zones do you cover?+
I'm based in Freetown, Sierra Leone (GMT), which overlaps a full working day with London and Europe and several hours with the US East Coast each morning. I keep flexible hours and have shipped with teams from London to Singapore — async-first, with overlap when it counts.
Can you take over a stalled project?+
Yes — rescuing half-finished builds is a big part of my work. I start with a short audit, then give you an honest plan to get it across the line.
Do you work with clients outside Sierra Leone or Africa?+
Yes — most of my clients are in the US, UK and Europe. Being based in Freetown, Sierra Leone means senior-level React, Next.js, Node.js and PostgreSQL work at a fraction of Western day rates, with real time-zone overlap and no agency markup.

Ready to build something extraordinary?

Let's turn your idea into a production-ready application. Every project starts with a free 30-minute consultation.

Start a project →View pricing