Sulayman A. Jallow

More Projects

Multi-Vendor Stock Management

Comprehensive web application for Ndimbalaan Enterprise to manage inventory across multiple vendors with real-time tracking.

LaravelPHPMySQLBootstrapJavaScript

CRM & Content Management System

Built a comprehensive CRM system with blog management, event tracking, and content management capabilities using modern stack.

Next.jsSanity CMSTypeScriptTailwind CSS

Taxi Booking Platform

Led full development of a production taxi booking app from zero to the Play Store — ride booking, real-time GPS tracking, biometric auth, and integrated payments on iOS & Android.

React NativeExpoTypeScriptFirebaseSocket.ioLottiei18n

MN Tradings Admin Panel

Enterprise-grade financial admin platform managing loans, deductions, transactions, and company accounts across 10+ user roles with multi-level approval workflows and full audit trails.

Next.jsTypeScriptTailwind CSSReact QueryRadix UIZustandFramer MotionjsPDF

Tyler's Laundry — Web App

Landing page and booking web app for a premium Gambian laundry & dry-cleaning service — featuring doorstep pickup/delivery scheduling, service listings, and a promotional onboarding flow.

Next.jsReactTypeScriptTailwind CSSshadcn/uiNode.jsExpressMongoDB

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Latest Writing

Blog & Notes

Thoughts on React, architecture, and the craft of building software.

React

15 Mar 2024·12 min read

Advanced React Patterns & Performance

Deep dive into React optimization techniques, custom hooks, and architectural patterns for scalable applications.

Architecture

10 Mar 2024·15 min read

Microservices Architecture Mastery

Comprehensive guide to designing, implementing, and scaling microservices with modern tools and best practices.

Database

5 Mar 2024·10 min read

Database Performance Optimization

Advanced techniques for query optimization, indexing strategies, and database scaling for high-traffic applications.

zaynsaul@gmail.com (+220) 83 5060606 / 87 2883518

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Email

zaynsaul@gmail.com

Phone

(+220) 83 5060606 / 87 2883518

Location

Kingston, Sukuta

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Sulayman A. Jallow

Also known as Saul Zayn · @saulzayn

Senior Software Engineer · Frontend & Mobile Lead

Sukuta, The Gambia•Mobile Development•Full-Stack · ERP

Years Experience

Web, mobile & enterprise apps

Projects Shipped

Fintech, edtech, ERP & e-commerce

Engineers Led

Frontend team leadership

Technologies

React Native, Next.js, Flutter & more

About Me

Language(s)

EnglishMandinkaWolofFula

GitHub Activity

View profile →

Education

Bachelor of Science in Computer Science

University of The Gambia · 2017 – 2021

Certifications

Amazon DSP — Campaigns Certification · 2026

Amazon DSP — Advanced Certification · 2026

Interests

ML/AIData ScienceRoboticsOpen SourceSoccer

Currently Learning

AI & LLM IntegrationRustAWS & CloudSystem Design

Professional Experience

Full Stack Developer

Saldi.dk

May 2026 – Present

Denmark · Remote

Contributing to a modular ERP system built on open-source foundations, used by SMEs across Denmark — spanning accounting, invoicing, inventory, and business workflow modules.

Key Achievements

Implementing and maintaining accounting, invoicing, inventory, and workflow modules in PHP and JavaScript
Improving performance and usability across legacy and modern codebases, reducing technical debt incrementally
Collaborating with an international remote team using agile practices to deliver scalable enterprise features

Full Stack Developer (Part-Time)

ITG Gambia

Sep 2025 – Present

Gambia · Hybrid

Building cross-platform mobile apps and web systems for production client products across React Native, Next.js, and Laravel.

Key Achievements

Building cross-platform mobile apps using React Native, Firebase, and Expo for production client products
Developing web systems with Next.js, React, and Laravel backed by PostgreSQL, MongoDB, and MySQL
Delivering end-to-end features: authentication flows, real-time notifications, and data management modules
Working directly with clients to define scope, gather requirements, and iterate toward launch

Software Engineer / Frontend Team Lead

Next Gen Agency

2024 – Present

Remote

Leading a frontend team of 4 engineers while architecting and delivering production React Native and Next.js applications across mobile, web, and e-commerce domains.

Key Achievements

Led Taxi Booking Platform from zero to 50+ Play Store downloads — real-time GPS tracking, biometric auth, and payment integration
Built biometric (Face ID/Touch ID), Swish Pay, and Elavon payment flows with PCI-compliant data handling
Architected Tutoor educational app (iOS/Android/Web) with 50+ custom hooks, assignment tracking, and real-time chat
Reduced production bugs by 30% through TypeScript strict mode and modular architecture across the team codebase
Improved engineer onboarding time by 25% through shared component libraries and standardised practices

Independent Software Engineer

Personal Products & Open Source

2026 – Present

Gambia

Designing, building and shipping my own products for the Gambian market end to end, from API and database to mobile apps, admin panels and deployment.

Key Achievements

Built Yóbbu, a delivery platform with customer and rider apps, an Express/Prisma API and a Next.js admin panel
Building Rafet, a salon and barbershop booking platform in a Turborepo monorepo with NestJS, PostGIS and Expo
Built Sunyu9, an offline-first app that migrates phone contacts to the new 9-digit numbering format
Published @saulzayn/rn-keyboard-form, an open source npm package for keyboard-aware React Native forms

Freelance Software Engineer / Technical Lead

Self-Employed

2021 – Present

Remote

Delivering full-stack web and mobile solutions for clients across fintech, trading, and enterprise sectors as an independent technical lead.

Key Achievements

Built MN Tradings Admin Panel — financial platform with 10+ user roles, multi-level approval workflows, and full audit trails
Developed Drop fintech mobile app — Stripe integration, Face ID/Touch ID, QR payments, and Expo Secure Store
Implemented advanced data tables with filter, sort, paginate, and one-click CSV/PDF export via jsPDF
Built multi-vendor stock system for Ndimbalaan Enterprise — replaced spreadsheet workflows for 6 vendors, 1,000+ SKUs
Delivered CRM with blog and event management for Leral Gambia using Next.js 14 App Router and Sanity CMS

Junior Developer

Cerenade

2021 – 2024

Gambia

Designed and maintained SQL Server databases and contributed to legacy application migrations in an agile team environment.

Key Achievements

Designed and maintained SQL Server databases including schemas, indexes, stored procedures, functions, and triggers
Contributed to migration of legacy applications to modern stacks, improving stability and maintainability
Participated in agile peer code reviews and collaborated across teams to deliver iterative product improvements

Programming Teaching Assistant

School of ICT, University of The Gambia

2019 – 2022

Gambia

Assisted in Web Programming I & II and Java Programming I & II, supporting 100+ students per semester through labs, exams, and 1:1 mentoring sessions.

Key Achievements

Supported 100+ students per semester across Web Programming and Java Programming courses
Conducted lab sessions, supervised examinations, and provided 1:1 support on programming concepts
Mentored students on practical software development, debugging, and problem-solving skills

Technical Expertise

Core Competencies

React

Frontend

Next.js

Frontend

TypeScript

Frontend

Tailwind CSS

Frontend

React Native

Mobile

Flutter

Mobile

Node.js

Backend

Laravel

Backend

What I Offer

Frontend Development

Modern, scalable web applications with React, Next.js, TypeScript, and responsive design using Tailwind CSS.

Team Leadership

Leading cross-functional frontend teams, mentoring developers, and driving code quality through best practices.

Full-Stack Solutions

End-to-end development from frontend to backend with Node.js, APIs, and database integration.

Mobile Development

Cross-platform mobile applications using React Native and Flutter for iOS and Android platforms.

Featured Projects

Yóbbu

Delivery & Courier Platform

Gambia-focused delivery platform connecting customers with verified riders. Request a pickup, negotiate a price, track it live, pay with cash or mobile money and rate the rider.

Customer and rider apps from one Expo codebase
Live tracking, price negotiation, cash and mobile money
Next.js admin panel for rider verification and disputes

React NativeExpoNext.jsExpressPostgreSQLPrismaTypeScript

Private repoCase Study

Customer app

Business app

Rafet

Salon & Barbershop Booking

Booking platform for barbershops, hair salons, braiders and nail studios in The Gambia, with customer and business mobile apps, an admin web app and a typed API.

Separate customer and business apps on shared packages
Nearby search with PostGIS and time-slot booking
Typed API client and admin web app in one monorepo

React NativeExpoNestJSPostgreSQLPostGISRedisTurborepo

Private repoCase Study

rn-keyboard-form

Open Source Package

My published npm package for keyboard-aware forms in React Native and Expo. Keeps the focused field above the keyboard and rides a footer and toolbar on it.

Published on npm as @saulzayn/rn-keyboard-form
iOS modal sheets, bottom sheets, tablets and landscape
Themeable keyboard toolbar and footer

React NativeTypeScriptReanimatedKeyboard Controllernpm

Code npm Case Study

Sunyu9

Phone Number Migration App

Offline-first mobile app that upgrades Gambian phone contacts from the old 7-digit numbers to the new 9-digit format, with a preview of every change and one-tap undo.

Fully offline: contacts never leave the device
Preview of every change before anything is written
Exact snapshot undo, even after an interrupted run

React NativeExpoTypeScriptZustandJest

More Projects

Multi-Vendor Stock Management

Comprehensive web application for Ndimbalaan Enterprise to manage inventory across multiple vendors with real-time tracking.

LaravelPHPMySQLBootstrapJavaScript

CRM & Content Management System

Built a comprehensive CRM system with blog management, event tracking, and content management capabilities using modern stack.

Next.jsSanity CMSTypeScriptTailwind CSS

Taxi Booking Platform

Led full development of a production taxi booking app from zero to the Play Store — ride booking, real-time GPS tracking, biometric auth, and integrated payments on iOS & Android.

React NativeExpoTypeScriptFirebaseSocket.ioLottiei18n

MN Tradings Admin Panel

Enterprise-grade financial admin platform managing loans, deductions, transactions, and company accounts across 10+ user roles with multi-level approval workflows and full audit trails.

Next.jsTypeScriptTailwind CSSReact QueryRadix UIZustandFramer MotionjsPDF

Tyler's Laundry — Web App

Landing page and booking web app for a premium Gambian laundry & dry-cleaning service — featuring doorstep pickup/delivery scheduling, service listings, and a promotional onboarding flow.

Next.jsReactTypeScriptTailwind CSSshadcn/uiNode.jsExpressMongoDB

Testimonials

Latest Writing

Blog & Notes

Thoughts on React, architecture, and the craft of building software.

React

15 Mar 2024·12 min read

Advanced React Patterns & Performance

Deep dive into React optimization techniques, custom hooks, and architectural patterns for scalable applications.

Architecture

10 Mar 2024·15 min read

Microservices Architecture Mastery

Comprehensive guide to designing, implementing, and scaling microservices with modern tools and best practices.

Database

5 Mar 2024·10 min read

Database Performance Optimization

Advanced techniques for query optimization, indexing strategies, and database scaling for high-traffic applications.