Olusegun Banji
Fullstack Developer (React.js • Node.js • NestJS • NextJS • Django • Typescript)
About
Hello, I'm Olusegun Banji
COSPIRE leverages my expertise in ReactJS, NextJS, NestJS, Typescript, Django, NodeJS, and Firebase to develop mission-critical features, including a multi-step booking form that contributes to the company's revenue streams. My contributions include managing backend integrations, implementing secure routing, and optimizing search functionalities.
A Bachelor's degree in Computer Science and Economics from Obafemi Awolowo University underpins my technical foundation. Currently pursuing a Master's degree at Quantic School of Business and Technology, I specialize in creating scalable web solutions and conversational AI systems.
Services
Web Development
Building robust and scalable web applications with full-stack backends and slick frontends
API & Backend Integration
Crafting secure and maintainable APIs, handling authentication, databases, and business logic
PWA & UX Enhancement
Designing Progressive Web Apps with smooth interactivity and offline readiness
Skills
Experience
Full Stack Engineer
Cospire (COSPIRE)
• Re-architected backend routing layer with Express.js, reducing API latency to sub-200ms
• Integrated 7+ external APIs (Firebase, Brevo, Google Maps, OpenStreetMap) to enhance platform services
• Led the development of a 5-step booking flow, boosting completion rate by 50%
• Optimized and secured SSO workflows with OAuth, cutting login errors by 60%
• Contributed to MVP2, helping secure 10+ early adopters and 3+ coworking partnerships
Key Achievements:
• Increased platform revenue by 20% through improved booking flow
• Reduced third-party request failures by 30% with resilient integrations
• Recognized by leadership for driving user adoption and platform growth
AI/ML Engineer & Fullstack Developer
CISRG
• Built and deployed a GPT-2-based chatbot API handling 1,000+ monthly conversations across Messenger and Telegram
• Designed and implemented 10+ Flask RESTful endpoints with OAuth 2.0 authentication
• Fine-tuned LLM prompts to improve chatbot accuracy and retention
• Collaborated with a research team of 5+ on AI/ML projects
Key Achievements:
• Improved chatbot accuracy by ~40%, reducing user confusion
• Increased backend scalability and security through API design
• Co-authored 4 peer-reviewed publications, all scoring above 65% in external evaluations
Software Engineer (Volunteer)
Indigitous
• Spearheaded development of a chatbot platform and real-time chat interface used by 500+ global users
• Integrated OAuth providers (Google and Facebook) to streamline user onboarding
• Built server-side rendered pages, improving SEO and page performance
• Designed and maintained a scalable social-media-like data model
Key Achievements:
• Reduced login drop-off by 35% with improved OAuth flows
• Increased page load performance by 45% and SEO ranking by 30%
• Co-led a 6-person dev team, achieving Top 8 placement in a global hackathon across 50+ cities
• Supported 1,000+ monthly social interactions through backend optimizations
Projects
poll-systems-backend
A Django backend for election polls
Django, PostgreSQL, Docker, REST API
Scarce2plenty
A crowd funding for agricultural goods sales app
React.js, Next.js, Firebase, TailwindCSS
Light Within Her
An blog website for healing, therapy and spiritual growth
Next.js, TailwindCSS, Sanity CMS
Apologist Chatbot Project
An AI-powered apologetics chatbot SAS
AI APIs (OpenAI), Next.js, Firebase/Auth
Indigitous Search Engine
A Non-copyrighted Search Application
Next.js, TailwindCSS, Custom APIs
Koinonia Divine Initiative Website
An official website for an international Christian NGO
React.js, Next.js, TailwindCSS
Blogging CRUD API Tutorial
A Blog CRUD Application
NestJS, TypeScript, REST API
SpaceX
A customized SpaceX landing page from their API
React, SpaceX API, Responsive Design
Tree of wally
A social media popularity monitization API
Node.js, Express, API Development
Medium Clone
A clone of medium.com
Next.js, Sanity CMS, TailwindCSS
Cospire
A B2B Space listing and booking startup
React.js, Node.js, Firebase, Google Maps
WhatsApp Web Clone
A clone of WhatsApp web
React, Firebase, Real-time Database
Growthbot PWA
Christian Discipleship Chatbot and Discipler connect App
React, PWA, Chatbot logic
Case Studies
Scarce2plenty — Agricultural Crowdfunding Platform
Problem:
Farmers lacked direct channels to market agricultural goods, facing middlemen costs.
Solution:
Built a crowdfunding/marketplace app enabling direct farmer-to-buyer sales.
Tech Stack:
React.js, Next.js, Firebase, TailwindCSS
Impact:
Improved farmer visibility; early beta allowed smallholder farmers to test fundraising models.
Light Within Her — Blog for Healing & Therapy
Problem:
Many individuals lacked an accessible platform for therapy and spiritual growth resources.
Solution:
Developed a blog site with easy CMS management and responsive layouts.
Tech Stack:
Next.js, Sanity CMS, TailwindCSS
Impact:
Empowered writers to publish quickly; grew community readership within first months.
Poll-systems-backend — Election Polling System
Problem:
Election systems needed transparent, secure backend APIs.
Solution:
Built Django-based backend with endpoints for polls, votes, and authentication.
Tech Stack:
Django, Python, PostgreSQL, REST Framework
Impact:
Enabled demo polling app; Loom walkthrough used in presentations for civic tech.
Feed Posts
Building Scalable React Applications
Best practices for structuring large React applications with proper state management and component architecture.
NestJS vs Express: A Developer's Perspective
Comparing two popular Node.js frameworks and when to choose each for your next project.
Firebase vs Supabase: The Database Showdown
A comprehensive comparison of two popular Backend-as-a-Service platforms for modern web applications.
Hire Me
Ready to bring your ideas to life? Let's discuss your project and create something amazing together. I'm available for freelance contracts and full-time opportunities.
Let's Start a Conversation
Message me on WhatsApp for quick responses and project discussions
Availability
Available immediately
Response Time
Within 24 hours
Time Zone
WAT (UTC+1)
Contact
Let's Connect
Ready to bring your ideas to life? I'm available for new projects and collaborations. Let's discuss how we can work together to create something amazing.