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I’m a full-stack and mobile developer with experience building web, backend, and iOS applications. I specialize in turning ideas into reliable MVPs and polished products, including mobile apps, APIs, dashboards, authentication systems, payment integrations, cloud deployments, etc.…

Kevin O

Full Stack Developer, Web Developer, Back-End Developer, +2

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I’m a full-stack and mobile developer with experience building web, backend, and iOS applications. I specialize in turning ideas into reliable MVPs and polished products, including mobile apps, APIs, dashboards, authentication systems, payment integrations, cloud deployments, etc.…

Available to hire

I’m a full-stack and mobile developer with experience building web, backend, and iOS applications. I specialize in turning ideas into reliable MVPs and polished products, including mobile apps, APIs, dashboards, authentication systems, payment integrations, cloud deployments, etc.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Work Experience

Software Development Engineer - Full Stack at Amazon

February 1, 2022 - February 1, 2024

Built mobile gateway API routes for user verification status checks; implemented backend document-submission APIs to support compliance workflows and improve the user verification experience; upgraded a production service to a fully automated CI/CD pipeline with anomaly- and error-rate-based rollback triggers, saving 10 hours per week in manual deployment effort; identified and implemented a caching solution for a high-traffic service processing 200K+ requests every 5 minutes, reducing GET request latency by 50%; integrated country-specific options across iOS, Android, and backend services to support a new international market; implemented automated data-deletion workflows across 6 services to support GDPR and CCPA compliance.

Freelance Client Work - Patient Intake

February 1, 2025 - March 1, 2026

Built a Go backend for a patient intake platform supporting form submission, insurance capture, document uploads, staff review workflows, and submission status tracking; designed serverless processing flows with DynamoDB intake records, S3 document storage, and EventBridge/Lambda triggers for follow-up work; implemented patient-record access logging to capture the staff user, access timestamp, and patient record viewed, with retained audit logs stored in S3.