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I’m a full-stack engineer who builds production-ready web applications, ERP systems, and mobile solutions with a strong focus on secure, maintainable architecture. I enjoy turning real business workflows—like sales, credit, accounting, and billing—into digitized systems with clear auditing, role-based access, and reliable process tracking. Lately, I’ve been improving system performance by optimizing API endpoints, reducing heavy response times, and using backend filtering/pagination along with caching strategies. From requirement gathering to deployment and long-term support, I collaborate closely with clients to deliver features that work well in the real world—using modern TypeScript/React/Next.js and Node.js with PostgreSQL, Redis, and cloud tooling.…I’m a full-stack engineer who builds production-ready web applications, ERP systems, and mobile solutions with a strong focus on secure, maintainable architecture. I enjoy turning real business workflows—like sales, credit, accounting, and billing—into digitized systems with clear auditing, role-based access, and reliable process tracking. Lately, I’ve been improving system performance by optimizing API endpoints, reducing heavy response times, and using backend filtering/pagination along with caching strategies. From requirement gathering to deployment and long-term support, I collaborate closely with clients to deliver features that work well in the real world—using modern TypeScript/React/Next.js and Node.js with PostgreSQL, Redis, and cloud tooling.

Jann Leo B. Gadil

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

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I’m a full-stack engineer who builds production-ready web applications, ERP systems, and mobile solutions with a strong focus on secure, maintainable architecture. I enjoy turning real business workflows—like sales, credit, accounting, and billing—into digitized systems with clear auditing, role-based access, and reliable process tracking. Lately, I’ve been improving system performance by optimizing API endpoints, reducing heavy response times, and using backend filtering/pagination along with caching strategies. From requirement gathering to deployment and long-term support, I collaborate closely with clients to deliver features that work well in the real world—using modern TypeScript/React/Next.js and Node.js with PostgreSQL, Redis, and cloud tooling.…I’m a full-stack engineer who builds production-ready web applications, ERP systems, and mobile solutions with a strong focus on secure, maintainable architecture. I enjoy turning real business workflows—like sales, credit, accounting, and billing—into digitized systems with clear auditing, role-based access, and reliable process tracking. Lately, I’ve been improving system performance by optimizing API endpoints, reducing heavy response times, and using backend filtering/pagination along with caching strategies. From requirement gathering to deployment and long-term support, I collaborate closely with clients to deliver features that work well in the real world—using modern TypeScript/React/Next.js and Node.js with PostgreSQL, Redis, and cloud tooling.

Available to hire

I’m a full-stack engineer who builds production-ready web applications, ERP systems, and mobile solutions with a strong focus on secure, maintainable architecture. I enjoy turning real business workflows—like sales, credit, accounting, and billing—into digitized systems with clear auditing, role-based access, and reliable process tracking.

Lately, I’ve been improving system performance by optimizing API endpoints, reducing heavy response times, and using backend filtering/pagination along with caching strategies. From requirement gathering to deployment and long-term support, I collaborate closely with clients to deliver features that work well in the real world—using modern TypeScript/React/Next.js and Node.js with PostgreSQL, Redis, and cloud tooling.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Language

Javanese

Intermediate

Work Experience

Developer at Go8 Technology Inc.

August 1, 2025 - Present

Led full-stack development of a lending company ERP system to digitize paper-based workflows across Sales, Credit, Accounting, and Billing. Implemented secure audit trails, role-based visibility, and department-specific process tracking. Improved ERP data retrieval performance by reducing the heaviest API response time from about 4 seconds to 47–300 milliseconds and shrinking payload size from about 1.4 MB to 600 KB by moving filtering/sorting to database queries, adding pagination, and introducing Redis caching. Built and maintained production web applications using Next.js, Node.js, PayloadCMS, PostgreSQL, Redis, Docker, and cloud deployment tooling while collaborating with clients on requirements, feature delivery, and long-term maintainability.

Freelance Full-Stack Engineer

January 1, 2023 - August 1, 2025

Delivered full-stack web and mobile applications for local and international clients using React, Next.js, React Native, Supabase, Firebase, MongoDB, Redis, and cloud services. Built a pharmacy e-commerce mobile application for medicine ordering, including customer-facing product browsing and order workflows, integrating with backend cloud services. Designed responsive UI with Tailwind CSS and Figma, and implemented secure authentication flows using Clerk, Firebase, Supabase, and custom authentication logic.