FULL STACK
ENGINEER

Evrwell

Freelance Project Manager & AI Engineer

AI-powered preventive healthcare platform with wearable integration, health analysis subscriptions, and a healthcare marketplace.

• Used Gemini to build nutrition image recognition, medical checkup document extraction, and preventive health analysis with avatar generation, turning smartwatch, nutrition, and medical checkup data into personalized health insights.
• Optimized medical checkup extraction by selecting and evaluating a lighter model, reducing inference costs by 65% and response time from 12 to 2–3 seconds while retaining 100% extraction coverage of medical checkup data in the documents evaluated.
• Negotiated subscription pricing and scope with stakeholders and modeled AI inference costs at 37% of subscription revenue under full quota usage.
• Led delivery of an integrated healthcare marketplace and onboarded three merchants, including Medizen, enabling commission-based sales of healthcare products and clinic services.
• Led a six-person team through an Agile workflow while managing delivery across Evrwell and Medizen concurrently.

Medizen

Freelance Software Engineer

Genetic testing and personalized health company, in partnership with Medizen Humancare, a genetic laboratory in South Korea.

• Built frontend and backend workflows using SvelteKit, Go, PostgreSQL, and RabbitMQ for a genetic testing platform serving 1,500+ registered users, covering test selection, checkout, sample tracking, and presentation of laboratory reports from South Korea.
• Implemented checkout idempotency across frontend and backend, eliminating duplicate checkout processing during repeated submissions and retries.
• Automated frontend regression testing with Playwright, reducing validation time for the same test scenarios by 88%, from 40 to 5 minutes.
• Built a GitHub Actions and Docker CI/CD pipeline with pre-merge regression checks and automatic rollback, reducing deployment time from 25 to 6–8 minutes.
• Reviewed frontend and backend architecture against modular design and domain-driven design principles, identifying improvements to maintainability and scalability.

Foldin

Freelance Software Engineer

Social platform connecting people through free and paid in-person events to address urban loneliness.

• Migrated the backend from NestJS to Go (Echo) to address memory bottlenecks, reducing staging API response times from approximately 35 ms to 5 ms, an improvement of approximately 85%, while lowering CPU and memory usage.
• Built subscriptions, event management, payments, community, and geolocation features for a platform serving 720+ users, enabling users to create, discover, and attend free or paid in-person events.
• Built an admin dashboard for five internal team members to manage platform content and monitor operations across 1,100+ user-created events.

Universitas Jenderal Soedirman

Bachelor of Computer Science

• GPA 3.93/4.00
• Thesis: Analysis of the Impact of Preprocessing Strategies on Data Leakage Risk in Machine Learning Model Development.

XHARP

Co-founder & Full Stack Engineer

• Co-founded a software development company, contributing to frontend, backend, DevOps, and quality assurance across projects including Evrwell, Medizen, and Foldin.
• Managed nine client projects from scoping through release, delivering all projects on schedule.
• Built and launched the company website using SvelteKit, Node.js, and Tailwind CSS to market the company’s services, showcase its portfolio, and connect with prospective clients.

Universitas Amikom Purwokerto

Full Stack Developer Intern

Private university focused on information technology, creative industries, and entrepreneurship.

• Independently developed an application for tracking computer inventory and damage using CodeIgniter 3, PHP, and MySQL, covering 200+ computers used by 2,000+ students during practicum sessions.
• Replaced paper, whiteboard, and Google Forms workflows with a centralized system, reducing the number of manual workflow steps by 70% and minimizing human error through standardized data entry.
• Consolidated device condition and damage records into integrated reports to support computer repair and replacement requests.

Sakola Kembara

Full Stack Developer Intern

Education nonprofit serving underserved communities.

• Built Vue interfaces supporting 5+ assessment types for approximately 20 teachers.
• Automated multiple-choice grading for assessments taken by hundreds of students, replacing manual answer matching and making scores available immediately after submission.
• Implemented gRPC communication between backend services using typed service contracts to keep request and response structures consistent across services.

Speakable Youth

Head of IT Support

• Led a team of 2 for four months to manage a Discord community of 1,000+ members.
• Ran technical setup for 3 weekly learning sessions and 1–2 weekly events (roughly 48 sessions over four months).

Modules Taken (2024)

Google Advanced Data Analytics Professional Certificate (2024) — Foundations of Data Science, Get Started with Python, The Power of Statistics, Regression Analysis, Go Beyond the Numbers

Soft Skills

Leadership, Communication, Interpersonal Skills, Negotiation, Team Coordination, Problem Solving

Languages & Frameworks

TypeScript, Golang, Rust, Python, Next.js, React, SvelteKit, NestJS, Laravel, Flutter

Infra & Tools

PostgreSQL, RabbitMQ, Docker, Sentry, Grafana, Playwright, Git, Supabase, Codex, Claude Code, Github

Interests

Financial Markets, Science, History, Technology

BINTANG YOSUA

Computer Science graduate from Universitas Jenderal Soedirman (GPA 3.93/4.00) and Full Stack Engineer with 2 years of experience delivering production platforms across healthcare, education, and social communities. Built and shipped nine client projects, covering frontend and backend development, DevOps, and quality assurance. Reduced AI inference costs by 65%, improved staging API response times by approximately 85%, and automated testing and deployment workflows. Experienced in Go, TypeScript, SvelteKit, PostgreSQL, and AI integration, with additional responsibility leading a six-person team and managing concurrent projects.