SAMUEL ADETUNJI ADEDEJI
SAMMEY'S ENGITECH
Badagry,Nigeria
1
Language
8
years of post-secondary education
3
years of professional experience
Accomplished Software Engineer specialising in JavaScript, HTML5, CSS3, and SQL. Delivered innovative software solutions through expertise in frontend technologies like React.js and Redux Toolkit, combined with backend development using Node.js and Express.js. Recognised for enhancing operational efficiency and customer satisfaction while demonstrating leadership and effective communication in team settings.
Work history
Operations Supervisor
5 Months- Operational Leadership: Supervised daily recycling plant operations and processing workflows, ensuring strict adherence to international environmental safety and material handling standards.
- Led multidisciplinary team of field operators and logistics personnel, optimising daily collection throughput and identifying workflow bottlenecks to enhance processing efficiency.
- Coordinated supply chain logistics, material onboarding, and inventory tracking systems, creating optimisation patterns that informed architecture of Eko Waste management application.
- Completed a six-month contract
Technical Freelancer | Fiverr Platform
5 Months- Delivered full-stack development services globally, overseeing client requirements from system design through to production hosting.
- Engineered bespoke, production-ready MERN stack software solutions for international clients, addressing unique enterprise requirements.
- Architect scalable Node.js/Express web backends and responsive React user interfaces tailored to specific business operations.
- Positioned engineering deliverables at premium tiers by ensuring high performance, code cleanliness, and comprehensive security audits.
Lead Full-Stack Engineer
8 Months- Architected, built, deployed Eko Waste, a comprehensive municipal logistics and waste-management web application, enhancing operational efficiency for local authorities.
- Engineered multi-module relational schema (Users, Collectors, LGA Zones, Transaction Logs) to effectively manage high-frequency logistical data points, supporting scalable operations.
- Implemented zero-trust model through complex Supabase Row-Level Security (RLS) policies, ensuring 100% data isolation across public REST endpoints, reinforcing data security.
Marketing executive
8 Months- Enhanced customer retention through targeted email marketing campaigns.
- Collaborated with sales team to align marketing strategies with business objectives.
- Facilitated cross-functional collaborations between departments leading to better project coordination.
- Designed high impact presentations for senior management meetings enabling informed decision making.
- Led team supervision, providing feedback and performance reviews to address underperformance.
Skills
Languages & Core Tech: JavaScript (ES6+)
HTML5
CSS3
SQL.
Frontend Development: React.js
Redux Toolkit
Tailwind CSS
Responsive Web Design.
Backend Development: Node.js
Express.js
RESTful API Design
JWT Authentication.
Databases & ORMs: PostgreSQL
MongoDB
Mongoose
Prisma ORM
Advanced Raw SQL.
DevOps & Tools: Git/GitHub
Vercel
Supabase
Postman
Row-Level Security (RLS) Configuration.
Problem-solving
Communication skills
Team building
Leadership
Knowledge of [Software]
Programme development
Calm under pressure
Education
BSC. - Computer Science
- Completed IT Qualification
- Member of NASS LASU Dance club
- Earned Best Dancer Computer Science Award
- Earned Fast Rising Artist Award
High School Diploma - science
TECHNICAL EXPERIENCE & PROJECTS
PROJECT: PROHEALTH NEXUS, (CORE DEVELOPER), Built an advanced, core-level Electronic Health Record (EHR) database management system handling complex, secure patient records., Wrote optimized, high-performance raw SQL queries directly inside a secure Node.js backend to bypass security bottlenecks and ensure maximum data isolation., Implemented ironclad credential protection by applying heavy cryptographic hashing on patient strings using bcrypt to prevent local and offline brute-force vectors.
Accomplishments
- Increased Website Traffic by 50%
- Developed and implemented SEO strategies for client websites, resulting in a 50% increase in organic traffic within six months.
- Led a Successful Website Redesign Project
- Managed a complete redesign of a major client's website, improving user engagement and reducing bounce rates by 30%.
- Optimized Website Performance
Languages
English
Upper intermediate
Affiliations
- Singing
- Reading
- Travelling
Timeline
Technical Freelancer | Fiverr Platform
2026.04 - 2026.09Read More
Lead Full-Stack Engineer
SAMMEY'S ENGITECH
2026.01 - 2026.09Read More
Marketing executive
HUASEN RECYCLING Int. COMPANY LTD
2025.03 - 2025.11Read More
Operations Supervisor
HUASEN RECYCLING COMPANY
2024.01 - 2024.06Read More
Lagos State University (LASU)
BSC. from Computer Science
2023.09 - 2026.08Read More
GLORYVILLE COLLEGE
High School Diploma from science
2016.09 - 2021.08Read More