I’m looking forward to collaborate on projects and deliver high impact services to clients.

Phone Number

+233-558-288-424

Email

williamofosu677@gmail.com

Socials

zelio
<span>

Hey, I’m William

</span>

Software{Backend}Engineer

<p>With over 4 years of experience architecting and,developing scalable,high-performant,backend systemsfor enterprise applications, mobility & transport, and financial services.</p>

...and more
[ Download my CV ]
zeliozelio

+

Years Experience

+

Full-stack Projects Completed

+

Startups & Enterprises

+

Developers Trained

Enterprise API Development

Built APIs handling 1M+ requests per day for businesses

Git Journaling
  • 17 Mar:

    E-commerce-Platform-Backend
  • 15 Mar:

    Yango-Ride-Simulation
  • 12 Mar:

    nodejs-realtime-notifications
  • 11 Feb:

    Ride-Sharing-Backend-voyage-connect-api
  • 25 Jan:

    Apollonia-Management-System-graphQl
Expertise

Designing solutionscustomized
to meet your requirements

API Development

Creating and integrating GraphQL & RESTful APIs to enable smooth communication between front-end and back-end systems.

Database Management

Designing and managing databases with SQL and NoSQL technologies such as MySQL, PostgreSQL/Supabase, and MongoDB.

Serverless Architecture

Optimizing cost & performance with cloud functions, cloud providers and containerization for seamless deployments.

Performance Optimization

Improving the speed and performance of web applications to provide a better user experience.

E-commerce Solutions

Developing scalable and secure payment solutions for e-commerce platforms tailored to your business needs.

Integrating AI

Integrating AI-driven solutions in backend systems to boost applications for efficiency, automation, and enhanced user experience

I'm excited to take on new projects and collaborate.
Let's chat about your ideas. Reach out!

zelio
Industry Experience

+4 years of obsession
with Code & System Architecture

Senior Software Engineer (Current Role & Leadership)
  • Led development of scalable web applications, improving performance and user experience for millions of users.
  • Leading backend development & IT strategy.
  • Integrated AWS services (S3) for scalable cloud solutions
zelio

Education

  • 2019-2023:

    University of Ghana

    Bsc. Mathematics & Statistics

  • 2022:

    Andela

    Certification in React and Redux, Node.js Developer Course

  • 2023:

    African Leadership Experience (ALX)

    Specialization in Backend Web Development

  • 2023:

    University of Hong-Kong

    Certification in Software Engineering: Implementation & Testing

Research Work

  • 2025:

    Google Cultural Research Contributor

    Insights on Ghanaian cultural artifacts for hyperlocal knowledge, community insights, and historical research.

  • 2024:

    Distributed systems & cloud-based microservices.

    Exploring Roy Fielding's REST: Principles and Applications

  • 2025:

    Machine Learning (ML) & Event-driven architecture

    Real-Time Fraud Detection System: Enhancing Security for High-Volume Transactions.

Skills

My Skills

  • Back-End:

    Node.js, Express, Python, Golang
  • Databases:

    MySQL, PostgreSQL/Supabase, MongoDB
  • Tools & Platforms:

    Git, Docker, AWS, Google Cloud
  • Others:

    RESTful APIs, GraphQL, Agile Methodologies

Let’s connect

Phone Number
+233-558-288-424
Email
williamofosu677@gmail.com