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Full-stack developer with 6 years of experience building high-scale, multi-tenant SaaS platforms where data correctness and query performance are equally critical. At Jubelio, I delivered PostgreSQL lifecycle tooling and warehouse query optimizations used in production by 3,000+ e-commerce sellers, and I also built WABantu, a solo WhatsApp commerce platform with production LLM integration to guide order flow and verify payment proofs.…Full-stack developer with 6 years of experience building high-scale, multi-tenant SaaS platforms where data correctness and query performance are equally critical. At Jubelio, I delivered PostgreSQL lifecycle tooling and warehouse query optimizations used in production by 3,000+ e-commerce sellers, and I also built WABantu, a solo WhatsApp commerce platform with production LLM integration to guide order flow and verify payment proofs.

Viko Wijaya

Full Stack Developer, Back-End Developer, Web Developer, +1

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Full-stack developer with 6 years of experience building high-scale, multi-tenant SaaS platforms where data correctness and query performance are equally critical. At Jubelio, I delivered PostgreSQL lifecycle tooling and warehouse query optimizations used in production by 3,000+ e-commerce sellers, and I also built WABantu, a solo WhatsApp commerce platform with production LLM integration to guide order flow and verify payment proofs.…Full-stack developer with 6 years of experience building high-scale, multi-tenant SaaS platforms where data correctness and query performance are equally critical. At Jubelio, I delivered PostgreSQL lifecycle tooling and warehouse query optimizations used in production by 3,000+ e-commerce sellers, and I also built WABantu, a solo WhatsApp commerce platform with production LLM integration to guide order flow and verify payment proofs.

Available to hire

Full-stack developer with 6 years of experience building high-scale, multi-tenant SaaS platforms where data correctness and query performance are equally critical.

At Jubelio, I delivered PostgreSQL lifecycle tooling and warehouse query optimizations used in production by 3,000+ e-commerce sellers, and I also built WABantu, a solo WhatsApp commerce platform with production LLM integration to guide order flow and verify payment proofs.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Beginner

Language

Indonesian

Fluent

English

Advanced

Work Experience

Founder / Solo Developer at WABantu

January 1, 2025 - Present

Built WABantu, a solo WhatsApp commerce platform spanning 10+ backend services and 40+ automated tests. Designed end-to-end system flows with rigorous manual QA across order flow, payment proof verification, and catalog routing. Production LLM integration to guide order flow and support commerce operations.

Mid Full Stack Developer at Jubelio

May 1, 2020 - Present

Designed and built Archiving V2, an enterprise data lifecycle platform for multi-tenant PostgreSQL. Authored a 30-step orchestrated archiving function (~12,000 lines of PL/pgSQL) spanning 50+ interconnected tables and engineered schema preservation (indexes, constraints, triggers, views, partitions) to support safe restores. Implemented multi-dimensional validation comparing production and backup warehouse/accounting quantities to achieve zero data integrity incidents. Reduced active DB size per tenant by 60–80% and improved query performance and reduced infrastructure cost. Led warehouse SQL redesign for reserved-stock execution time improvements (4.8s to 70ms), optimized quantity validation to cut latency to ~268–307ms, eliminated production timeouts for large chronology queries, and migrated to a multi-warehouse allocation architecture. Also launched Archiving V1 for up to 60% responsiveness improvement and delivered cancelled-order handling for accurate warehouse adjustments at

Full Stack Developer at Ayo Tani

October 1, 2019 - April 30, 2020

Delivered an agriculture investment platform within 4 months across Android (Kotlin), Laravel web, and backend services using PostgreSQL.

Backend Developer at IT Provent

October 1, 2016 - September 30, 2019

Integrated Bank Mandiri APIs for a financial technology Android app serving Unilever retailers and distributors. Built PPOB payment features and optimized CSV import pipelines for invoice datasets up to 50 million rows.

Full Stack Developer at PT. Arius Angkasa Indonesia

February 1, 2016 - August 31, 2016

Developed a member rewards and MLM system in Laravel 5 with MySQL for partner merchant transactions.

Backend Developer at PT Sarana Multi Infrastruktur (Persero)

December 1, 2015 - January 31, 2016

Automated SQL Server data migration into a monitoring database using stored procedures and Laravel integration.

Intern at MyMe Tala International

June 1, 2015 - September 30, 2015

Produced a field sales web application and API in Laravel 4 with Android client integration.