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John winneby Merissaint

@johnwinnebymerissain

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I build backend APIs, payment integrations, and business management systems.

Haiti

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What I'm looking for

I'm looking to build backend applications, APIs, payment integrations, and business systems where I can contribute to reliable delivery, software quality, documentation, and practical operational solutions.

I build web applications, backend services, databases, and APIs, including payment, geolocation, and business-management workflows.

At CONATEL, I contribute to internal applications for radio communications management, translating operational needs into practical software solutions while supporting documentation and application quality.

I've integrated Stripe and MonCash for Ayibo Marine Express, connecting payment results to reservations, digital QR tickets, parcel tracking, and maritime operations. My work also includes quality assurance, ISO 9001 documentation, API testing, and cloud and DevOps practices.

Experience

Work history, roles, and key accomplishments

Current

Contractor – Radio Communications Management & Internal Application Developer

Current

CONATEL (National Telecommunications Council)

Jan 2026 - Present (8 months)

Assigned to radio communications management activities and contributed to the development and improvement of internal applications supporting organizational operations. Analyzed business needs and supported application quality, documentation, and coordination with stakeholders.

Software Development Requirements Analysis Documentation Quality Assurance Stakeholder Coordination

Documentation and Quality Assurance Engineer

Turbo Systems S.A.

Oct 2024 - Sep 2026 (1 year 11 months)

Created and structured technical documentation for applications and software products. Prepared and executed functional, performance, and security test plans, and supported compliance with ISO 9001 quality requirements.

Technical Documentation Test Planning Functional Testing Performance Testing Security Testing Defect Tracking ISO 9001 Code Review Audit Reporting Quality Assurance

Consultant – Web and Backend Development

Brikinteractive LLC

Jan 2025 - Dec 2025 (11 months)

Designed and integrated web applications with backend services, databases, and APIs. Contributed to performance improvement and implementation of business workflows based on client requirements.

Web Development Backend Development API Integration Database Management Performance Optimization

Junior Systems Engineer & Sales Engineer

CompuConsult

Oct 2023 - Oct 2024 (1 year)

Developed and integrated web applications, databases, and APIs. Supported IT infrastructure maintenance, process automation, and systems security, and provided technical support and quotations to customers.