Collins Maduka
$40/hr
Sr. Engineer: React/Next.js, Node/TypeScript, AWS/GCP/Azure & microservices architecture.
Collins Maduka
Sr. Software Engineer
➢ReactJS/NextJS
➢React Native/Lynx
➢NodeJS/Deno
➢Javascript/Typescript
➢Java/Spring Boot
➢AI Agents
➢Elixir/Phoenix
➢Solidity/Web3 (UniSwap,
DeFi, DEX)
Profile Summary
Results-driven Software Engineer with over 8 years of experience in designing, delivering, and
optimizing scalable, high-performance systems. Proven expertise in enhancing database performance,
implementing secure cloud-based solutions, and driving business growth through technical innovation.
Proficient in a range of technologies including Node.js, Java, ReactJS, NextJS, JavaScript/TypeScript,
SQL/NoSQL databases, and Cloud Services (AWS, Azure, GCP). Skilled in building robust microservices
architectures, automating CI/CD pipelines, and implementing robust security practices. Adept at
collaborating with cross-functional teams to translate complex requirements into impactful technical
solutions, consistently delivering projects that drive operational efficiency and user satisfaction.
Work Experience
📖 📖
📖
Software Engineer - Built Circle | 03/2024 – Present
Project: Built Circle - Marketplace for Construction Supplies & Services
Technologies: React.js, Next.js, TypeScript, Node.js, Express.js, MongoDB, AWS (EC2, S3, Lambda),
Redis, Docker, Kubernetes, Nginx, Swagger, GitLab CI/CD, Jenkins, Playwright, Jira, Agile principles.
Description: Leading the development of a B2B/B2C marketplace platform designed to digitize
procurement workflows for the construction industry. The platform enables suppliers to list bulk
materials (e.g., steel, cement) with dynamic pricing, while buyers can compare quotes, track shipments,
and manage invoices in real time.
Key Contributions::
Contact
Lagos, Nigeria
- (Mobile)
●
-https://linkedin.com/in/collinsuba
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https://github.com/codeblizz
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Education
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Diploma Certificate in Core Java
Language (J2EE & JSE):
2009-06 -> 2011-03
NATIONAL INSTITUTE OF INFORMATION
TECHNOLOGY (NIIT- Lagos, Nigeria)
Bachelor of Science & Engineering
in Chemical Engineering:
2003-09 -> 2008-06
FEDERAL UNIVERSITY OF TECHNOLOGY OWERRI
(FUTO) - Imo, Nigeria
Frameworks / Libraries / Protocols
★ ReactJS
★ NextJS-SSG/SSR
★ React
★ ExpressJS
Native
★ Redux
★ tRPC
★ React-Query
★ Zustand
★ PassportJS
★ Web
Socket
★ SOAP
★ Struts
★ OAUTH2
★ JWT
★
CORS
★ FastifyJs
★ NestJS
★ Yup/Zod
★ Webpack
★ Microservices
★ Babel
★ J2EE
★ JSP
★ Servlets/filters
★ Jackson
★ React-MapboxGL
Elasticsearch, Kibana, Swagger, Splunk, Selenium, Jira, Microservice BFF architecture.
Description: Teamed up to lead backend development for a ride-hailing platform focusing on driver
operations (ride assignments, earnings tracking) and fleet management. Integrated with third-party
mapping (Google Maps) and payment gateways (Stripe).
Key Contributions:
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★ Ant
Project: Financial Wedge Application - FinTech
Technologies: Node.js, Fastify.js, React.js, Next.js, TypeScript, PostgreSQL, MongoDB, Redis, Next-Auth,
AWS (EC2, RDS), Docker, Jest.
Description: Collaboratively led the development of a wealth management platform enabling clients to
track multi-asset portfolios (bank accounts, pensions, loans, stocks, investments, crypto, properties) and
liabilities (loans, credits, mortgages) with real-time analytics, risk assessment, and automated tax
reporting.
Key Contributions:
●
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●
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Engineered a React.js/Next.js dashboard with D3.js visualizations for portfolio performance,
increasing user engagement by 28% through interactive data exploration.
Optimized PostgreSQL queries using window functions and partial indexes, reducing report
generation times from 12s to 3s for datasets exceeding 1M rows.
Secured API endpoints with Next-Auth and JWT, implementing rate limiting and IP whitelisting to
block 100% of brute-force attacks during stress tests.
Reduced AWS costs by 15% by containerizing services with Docker and auto-scaling EC2 instances
based on CPU/memory thresholds.
Automated end-of-day portfolio reconciliation using Node.js cron jobs, eliminating manual errors
in 5,000+ daily transactions.
Full Stack Developer - TPConnects Technology, Dubai | 09/2020 – 09/2021
Web Applications/Servers
★ Apache
Built a Nest.js-based driver rostering microservice, reducing ride assignment latency by 25%
through geospatial indexing and optimized matching algorithms.
Implemented Kafka for event-driven communication between ride management and payment
services, achieving 98% transaction success rates during peak hours.
Reduced debugging time by 30% by centralizing logs with Elasticsearch/Kibana, enabling
real-time tracking of API errors and performance bottlenecks.
Automated regression testing with Selenium, achieving 85% test coverage and reducing QA cycles
from 3 days to 8 hours.
Software Engineer - Hoxton Capital Management, Dubai | 10/2021 – 09/2022
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Design
★ SCSS/SASS
★ ReactStrap
★ BootStrap
★ Material UI
★ Chakra-UI
★ TailwindCSS
★ StyledComponent ★ Shadcn UI
★ Nginx
Project: Buddy’s Android | iOS Taxi App | Booking Slot App (Internal React/NodeJS App)
Technologies: Node.js, Nest.js, MongoDB, Azure (AKS, Cosmos DB), Redis, Docker, Kubernetes, Kafka,
★ Next-Connect
Design/Styling
★ CSS3
Software Engineer - Al Ghurair Investments, Dubai | 10/2022 – 02/2024
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Technical Skills
★ ReactHookForm
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Architecting a microservices-based backend using Node.js/Express.js, containerized with Docker
and orchestrated via Kubernetes, reducing deployment failures by 40% and enabling horizontal
scaling API requests.
Designing a React.js/Next.js (TypeScript) frontend with role-based dashboards
(supplier/buyer/admin), integrating real-time notifications via Redis Pub/Sub to reduce order
confirmation latency.
Optimizing MongoDB schemas using compound indexing and aggregation pipelines, improving
query performance by 45% for high-traffic endpoints like inventory search and order history.
Securing sensitive data with AWS KMS for encryption-at-rest and OAuth 2.0 for authentication,
achieving SOC 2 compliance and eliminating vulnerabilities flagged in third-party audits.
Automating CI/CD pipelines using GitLab and Jenkins, enabling zero-downtime deployments and
reducing release cycles from 4 hours to 15 minutes.
TomCat
Databases/Caching/Specifications
Project: B2B Airline Booking Dashboard Application
Technologies: Java, Spring Boot, React.js, TypeScript, Redux, Node.js, Express.js, MySQL, MongoDB,
Redis, Auth0, Docker, Kubernetes, Nginx, Jenkins, AWS, DynamoDB.
Description: Transformed old legacy booking and reservation systems into a robust, scalable and
modernized system application for 8 airlines (Egypt Air, Gulf Air, Sri-Lanka Airline, Saudi Air, Air
★ MongoDB
★ Mongoose
ORM
ORM
★ Type ORM
★ Redis
★ Sequelize
★ MySQL
★ Hibernate/JPA
★ Firebase
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★ Prisma
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★ DynamoDB
★ AWS
★ WordPress
★ Docker
★ Asana
★ Google
Cloud
★ GitHub/GitLab
★ Heroku
★ Kubernetes
★ Kibana
★ JIRA
★ Slack
★ Shopify
★ Joomla
Elastic Search
★ TerraForm
★
★ React
★ Jest
★ Mocha
Build /Version Control / Deployment
★ Npm
★ Yarn
★ Git
★ Docker
Message Brokers/ Streaming
Processing
★ Kafka
★ RabbitMQ
API Implementation
★ Rest
API
★ MQTT
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Full Stack Developer - Mere Systems, Abu Dhabi | 03/2020 – 08/2020
Project: Cloud-Based Point Of Sale(POS) SaaS Application
Technologies: React.js, React Native, Node.js, Express.js, MongoDB, AWS (S3, EC2), Redux, PassportJS,
Description: Led development of a SaaS POS system for retail chains, enabling real-time inventory
Testing lib.
★ Jenkins
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★ GraphQL
★ Web
Socket
tracking, multi-store sales analytics, and offline transaction sync for various outlets.
Key Contributions:
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Competencies
Agile Methodology
Solid Principles
System Designs
API Documentation
Affiliations
●
Association of Information
Technology Professionals
Institute of Chemical Engineers.
Accomplishments
● Spearheaded the launch of new product
applications, driving a notable increase in
company revenue.
● Delivered critical projects on schedule and
within budget, successfully resolving
complex technical challenges.
● Partnered with engineering teams to
design and implement software systems
that exceeded project requirements.
● Managed multiple projects
simultaneously, consistently meeting
deadlines while maintaining exceptional
quality standards.
● Identified and resolved critical production
software bugs, preventing significant
system outages and ensuring operational
continuity
Reduced checkout time by 30% by optimizing MongoDB aggregation pipelines for real-time stock
updates and sales tax calculations.
Slashed AWS storage costs by 25% by migrating invoice PDFs from on-premise servers to S3 with
lifecycle policies for archival.
Achieved 100% test coverage for payment processing modules using Jest and React Testing
Library, eliminating post-release defects.
Delivered a React Native mobile app for managers, enabling offline access to sales reports and
improving operational efficiency.
Full Stack Developer - Freelance, Dubai | 01/2019 – 03/2020
Project: Meal Search Web Application
Technologies: Node.js, Express.js, React.js, MongoDB, Mapbox API, Redis, Webpack, Mocha, Chai.
Description: Developed a food delivery aggregator platform connecting restaurants with users,
featuring real-time order tracking, loyalty programs, and AI-driven meal recommendations.
Key Contributions:
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Replaced a legacy PHP monolith with a React.js/Node.js SPA, reducing booking page load times
from 8s to 2s and improving conversion rates by 20%.
Developed IATA NDC-compliant APIs using Java Spring Boot for fare calculation, achieving 98%
accuracy in Sabre and Amadeus integration tests.
Cut infrastructure costs by 30% by migrating to Kubernetes-managed Docker containers on AWS,
optimizing resource allocation for seasonal demand spikes.
Reduced session management latency by 40% using Redis for caching JWT tokens and user
profiles across monthly bookings.
Automated CI/CD pipelines with Jenkins, enabling daily deployments with rollback strategies that
reduced production outages by 50%.
JWT, Jest.
Testing Tools
★ JUnit
Key Contributions:
★ PostgreSQL
Cloud Platforms/CMS/Collaborations
★ Vercel
Cairo, Cathay Pacific, Singapore Airline, Eastern Airline), aligning with IATA NDC standards to enable
dynamic pricing, seat mapping, and GDS integrations.
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Scaled the backend to improve daily orders handling using Node.js clustering and MongoDB
sharding, ensuring 99.5% uptime during peak hours.
Improved search relevance by 40% by implementing geospatial indexing and integrating Mapbox
API for location-based restaurant discovery.
Reduced order confirmation latency by 25% using Redis for caching menu data and pub/sub for
real-time kitchen updates.
Cut bounce rates by 22% by redesigning the React.js UI with lazy-loaded images and skeleton
screens for faster perceived performance.
Full Stack Developer - Freelance, Dubai | 04/2017 – 01/2019
Project: Vehicle Rental Platform
Technologies: Java, Spring Boot, React.js, Elasticsearch, Docker, Hibernate, JPA, MySQL, Sequelize,
Prometheus, Grafana.
Description: Developed a car rental platform enabling dynamic pricing, and real-time GPS tracking.
Key Contributions:
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Eliminated double-booking errors by 90% using Hibernate optimistic locking and idempotent API
design for reservation endpoints.
Boosted search accuracy by 50% by indexing vehicle data (location, price, features) in
Elasticsearch with custom scoring algorithms.
Automated deployment rollbacks with Docker and Prometheus alerts, reducing production
downtime by 25%.
Integrated Grafana dashboards for real-time health monitoring, cutting maintenance delays by
30%.
Full-Stack Engineer - TV360 Lagos, Nigeria | 04/2015 – 03/2017
Project: Hybrid Mobile App & WordPress Streaming Platform
Technologies: JavaScript, Ionic Framework, AngularJS, WordPress, AWS (CloudFront, EC2), Redis,
Rotractor, Yoast SEO, DataVideo Encoders & Decoders, and LiveStream Media.
Description: Partnered in leading the development of a live-streaming platform for supporting 2M+
monthly viewers with real-time broadcasts, VOD, and ad monetization.
Key Contributions:
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Reduced mobile app crashes by 70% by refactoring Ionic/AngularJS code and introducing
automated E2E testing with Protractor.
Achieved 99.9% broadcast uptime by optimizing AWS CloudFront CDN caching and HLS
streaming protocols for low-latency delivery.
Improved organic traffic by 50% using Yoast SEO and Redis-cached WordPress pages, reducing
TTFB from 3s to 800ms.
Configured satellite uplinks via SES London for live broadcasts, ensuring <1s latency for
international news feeds.
Reduced video buffering by tuning encoders for adaptive bitrate streaming across social platforms
