chryzcode

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Open to Backend & Full-Stack Opportunities

Backend / Full-Stack
Software Engineer

I build practical, production-focused software, backend systems, APIs, and web applications using Python, Django, PostgreSQL, and modern cloud infrastructure.

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01 // Profile

About Me

I'm Olanrewaju Alaba — Chryzcode, a backend-focused full-stack software engineer building practical, production-focused software with 5+ years of engineering experience.

My primary backend stack is Python, Django, Django REST Framework, PostgreSQL, Redis, Celery, and AWS. I specialize in designing transactional database models, high-throughput APIs, background workers, and resilient cloud architectures.

I also build full-stack web applications using React, Next.js, and TypeScript, integrating Stripe billing, authentication, and external services. I have architected and built the core systems across almost all projects featured in this portfolio, delivering production software for both client platforms and specialized engineering products.

Whether designing a multi-sided marketplace backend like Instasew, cross-chain payment pipelines, or data-intensive SaaS platforms, my focus is always on engineering integrity, clean architecture, and reliable production execution.

Read My Full Story

02 // Capabilities

Technical Skills

Backend Engineering

PythonDjangoDjango REST FrameworkFastAPINode.jsExpress.js

Databases & Data

PostgreSQLMongoDBSQLitePrismaMongooseRedis

Frontend Engineering

ReactNext.jsTypeScriptJavaScriptHTMLCSSTailwind CSS

Cloud & Infrastructure

AWSDockerCeleryVercelRenderNetlifyDigitalOcean

Payments & Integrations

StripePayPalPaystackREST APIsWebhooksOAuth

AI & Automation

OpenAI APIsAI integrationsPython automationWeb scraping

Blockchain

SoliditySmart ContractsWeb3Ethers.jsHardhatDeFi integrations

Documentation & Collaboration

OpenAPISwaggerPostmanGitTechnical DocumentationJira

03 // Engineering Portfolio

Selected Work

Featured systems, marketplace architectures, APIs, and SaaS products.

01 — Marketplace / Backend EngineeringCompany Project

Instasew

Fashion Marketplace Platform

A multi-sided fashion marketplace platform designed to connect bespoke fashion designers, clients, and logistics carriers with real-time bidding, order tracking, and escrow-backed payouts.

Key Contributions
  • ›Owned backend architecture and production delivery for the marketplace platform.
  • ›Built and maintained Django and Django REST Framework services.
  • ›Designed PostgreSQL data models and business workflows.
  • ›Implemented background processing using Redis and Celery.
  • ›Worked on payments, wallet payouts, subscriptions, messaging, bidding, and negotiation.
  • ›Supported AWS production and testing environments.
  • ›Contributed to a platform serving approximately 200 users.
PythonDjangoDjango REST FrameworkPostgreSQLRedisCeleryAWSStripe
View Case Study
Marketplace Architecture● Production
[Django REST API Engine]
   ├── PostgreSQL (ACID Data Models)
   ├── Redis + Celery (Async Queue)
   ├── Stripe & Escrow Wallet Service
   ├── DHL Shipping Webhooks
   └── AWS Production Cloud
~200 Active UsersBespoke Logistics
02 — FinTech / BlockchainPersonal Project

NexaPay

Cross-Chain Payment Platform

A blockchain payment platform designed to support payments across multiple networks and chains.

Key Contributions
  • ›Built the application using Next.js and TypeScript.
  • ›Worked with Solidity smart contracts.
  • ›Integrated blockchain transactions and wallet interactions.
  • ›Implemented cross-chain payment functionality using Stargate.
  • ›Worked with testnet and mainnet environments.
  • ›Implemented a platform transaction fee model.
Next.jsTypeScriptSolidityWeb3Smart ContractsStargate
View Case StudyView Project
NexaPay
03 — AI / Web ApplicationClient Project

Essay Revive

AI Writing Assistant

An AI-powered writing assistant application designed to help users generate, structure, and refine academic and professional essays with seamless content generation workflows.

Key Contributions
  • ›Integrated AI functionality into a web application.
  • ›Built application workflows around content generation.
  • ›Worked on the user interface and application experience.
  • ›Integrated payment functionality for paid access.
  • ›Delivered the MVP for a client.
Next.jsTypeScriptAI APIsMongoDBStripe
View Project
Essay Revive
04 — SaaS / FinTechClient Project

ClearPeak Trading

Trading Analytics SaaS

A subscription-based trading analytics platform offering performance indicators and paid access to specialized tools.

Key Contributions
  • ›Built the application using Next.js and TypeScript.
  • ›Implemented authentication using Auth.js.
  • ›Used Prisma and PostgreSQL for data management.
  • ›Integrated Stripe subscriptions.
  • ›Implemented Stripe webhook handling.
  • ›Worked with subscription lifecycle events.
  • ›Integrated Brevo for email communication.
Next.jsTypeScriptAuth.jsPrismaPostgreSQLStripeBrevo
View Case StudyView Project
ClearPeak Trading
05 — Backend / REST APIClient Project

Travel Leaf APIs

Rental Marketplace API

A backend API for a platform connecting users with owners of houses, yachts, and vehicles for rental, leasing, and booking workflows.

Key Contributions
  • ›Built REST API functionality with Node.js and Express.
  • ›Implemented authentication and authorization workflows.
  • ›Worked with JWT and Google OAuth authentication.
  • ›Integrated MongoDB through Mongoose.
  • ›Added file upload and Cloudinary integration.
  • ›Integrated Stripe payment functionality.
  • ›Implemented email and account verification workflows.
  • ›Added security middleware, rate limiting, and request protection.
  • ›Prepared API documentation for developers.
Node.jsExpressMongoDBMongooseJWTGoogle OAuthStripeCloudinary
View API Documentation
Travel Leaf APIs
06 — Business Consulting / Web ApplicationClient Project

FWC26 Marketing Group

Business Consulting Platform

A business consulting platform helping entrepreneurs and small businesses explore opportunities connected to the FIFA 2026 ecosystem in Toronto and Vancouver.

Key Contributions
  • ›Built the platform with Next.js, React, and TypeScript.
  • ›Integrated Stripe payments.
  • ›Integrated Calendly for consultation bookings.
  • ›Connected OpenAI-powered live chat functionality.
  • ›Integrated Mailchimp for marketing communication.
  • ›Implemented payment and email workflows.
  • ›Added input validation and rate-limiting measures.
  • ›Deployed the application using Vercel.
Next.jsReactTypeScriptMongoDBStripeCalendlyOpenAI APIMailchimpVercel
View Project
FWC26 Marketing Group

Secondary Work

More Projects

Additional web applications, APIs, smart contract tools, and utilities.

Personal Project

AssetFlow

Blockchain asset management and ownership transfer platform.

Next.jsFirebaseSolidityTailwind CSS
Client Project

MathPoint

Mathematics learning and problem-solving platform.

TypeScriptNext.jsMongoDBStripe
Client Project

YCSYH

Beat-selling e-commerce platform with file delivery and PDF license generation.

Next.jsStripeTypeScriptPDF Engine
Personal Project

CVBuild

Resume and portfolio-building platform.

PythonDjangoDRFPostgreSQL
Personal Project

TokenForge

ERC-20 token implementation using Solidity and OpenZeppelin.

SolidityHardhatEthers.jsOpenZeppelin

04 // Employment

Experience

Professional engineering experience, systems architecture, and production delivery.

Backend / Full-Stack Engineer

Instasew
2024 – Present
  • Owned backend architecture and production delivery for a fashion marketplace.
  • Built and maintained Django and Django REST Framework services.
  • Designed PostgreSQL data models and business workflows.
  • Implemented background processing using Redis and Celery.
  • Worked on payments, wallet payouts, subscriptions, messaging, bidding, and negotiation.
  • Supported AWS production and testing environments.
  • Contributed to a platform serving approximately 200 users.

Backend Engineer

InstinctHub
Nov 2023 – May 2024
  • Led backend development, building robust APIs, securing infrastructure, and designing core database layers.
  • Integrated payment gateways (Paystack, PayPal) and USSD systems via Africa's Talking platforms for accessible transactions.
  • Shipped features like 'Scoreboard' for the core EdTech application, improving student interaction and platform metrics.

Backend Engineer (Contract)

Bizconnect
2024
  • Built background automated systems enabling users to extract LinkedIn data, manage lead targets, and schedule email campaigns.
  • Integrated secure subscription checkouts via Stripe, mapping role-based access permissions dynamically across the database.
  • Hosted infrastructure components on AWS, tuning configurations for scalability and load protection.

05 // Endorsements

What Clients Say

Feedback from clients and collaborators I’ve worked with across different projects.

"It was a pleasure working with Olanrewaju. He demonstrated strong communication skills and a great ability to follow direction. Most importantly, we collaborated effectively to achieve our vision."
DynastyCorpCanada
"I couldn't be happier with the work. Communication was clear, professional, and consistent. They went above and beyond to solve unexpected challenges, explained solutions clearly, and made sure everything worked exactly as promised. Highly recommended."
merrelhurdUnited Kingdom
"Was able to solve my coding problem with my smart contract. Very knowledgeable, would recommend him and will continue to use him for future projects. Thank you."
SirRelbertUnited States

06 // Inquiries

Frequently Asked Questions

I build backend services, APIs, SaaS platforms, marketplaces, payment-enabled applications, and full-stack web products.

07 // Collaboration

Let’s Build Something Useful

Have a product to build, an existing system to improve, or a backend problem to solve?

I’m open to backend engineering, full-stack development, product collaborations, and selected freelance opportunities.

EMAILalabaolanrewaju13@gmail.comGITHUBchryzcodeLINKEDINOlanrewaju AlabaX@chryzcode