WISNU PUTRA DEWA
Fullstack Developer — Backend at Core
About
Senior Backend Engineer with 9+ years of experience designing and building backend systems for enterprise and high-complexity domains. I specialize in backend architecture, database design (ERD), and business-critical systems, with hands-on experience across healthcare, HR management, and incentive-based platforms.
Approval Binary
Laravel plugin for binary bitmask-based approval workflows. Multi-level approval chains with efficient state tracking and high-performance querying. Demonstrates real-world enterprise patterns for complex business logic.
Healthcare Systems
Designed and maintained backend systems for multiple hospitals concurrently, handling medical data integrity and RBAC.
Enterprise HR
Backend engineer for HR systems covering employee lifecycle, approval workflows, and payroll-related logic.
Complex Business Logic
Built multi-level incentive platforms with hierarchical data modeling and complex commission calculations.
Experience
Professional career and education
Back End Developer — PT. Bezhoe Infotek Indonesia
Designed backend architecture and system components for HR management systems used by large enterprise property groups. Implemented employee lifecycle management, approval workflows, payroll-related business logic, and secure database schemas.
Full Stack Programmer — Dekate.id
Designed and maintained backend systems for multiple hospital environments concurrently. Focused on medical data integrity, role-based access control, query optimization, and high-availability service operation.
Full-stack Developer — PT Tadana Raya Dwarsa
Built backend logic for multi-level incentive platforms and complex commission calculations. Modeled hierarchical data and maintained transaction consistency across calculation-heavy business rules.
Android Developer (Kotlin, Jetpack) — Personal / Side Projects
Building and publishing Android apps in Kotlin and Jetpack (Java earlier). Latest project: StockLab, live on Google Play with 100+ installs.
Backend Developer (Java) — Confidential Client — Contract (NDA)
Delivered backend services in Java (Spring Boot) alongside university: RESTful APIs, Spring Data JPA / Hibernate data layer, and Spring Security. Unit testing with JUnit, Git Flow branching.
Education & Certification
Computer Science in Software Technology — Universitas PGRI Madiun (GPA 3.45). National Certification based on SKKNI in Informatics — KOMINFO (May 2017).
Additional Experience
Side work and extra engagements
Custom Blockchain Backend
Chain structure, transaction flow, wallet-related logic, validation rules, and integrity-sensitive APIs for a private blockchain.
RAG Data Indexing
Helped a peer index medicine data for a retrieval-augmented-generation project.
API & Integrations
Authentication, payment-related flows, external services, Tron, NFT-related services, and Binance-related integrations.
Remote Delivery
Coordinated with frontend and DevOps teams through API contracts, sample payloads, validation rules, logs, database changes, deployment timing, and release notes.
AI Tools
Codex, Claude Code, opencode, and Gemini — daily-driver AI coding assistants for pair-programming, refactoring, and code review.
Portfolio details for enterprise and private blockchain work are summarized to protect confidential client information.
Skills
Tech stack and areas of expertise
Languages
Frameworks
Database
Backend & Architecture
Mobile
Tools & Practices
Technical Leadership
Projects
Selected work and side projects
Sinarmas Land Recruitment Platform
Enterprise recruitment web platform. Public job listing and candidate application flows, admin-side data management, validation, and workflow reliability in production.
Visit Site →CoinBazooka
Crypto listing and discovery platform. Coin listing pages, market data display, chain-based filtering, promoted listings, and trending project discovery.
Visit Site →MyERP
Backend-only ERP system built with Laravel 12, focused on enterprise-grade business workflows, strict type safety, and a reusable approval workflow engine.
View Project →Approval Binary
Laravel plugin for binary bitmask-based approval workflows. Multi-level approval chains with efficient state tracking and high-performance querying.
View Project →StockLab
Offline inventory management app for small businesses. Track product purchase costs using COGS methodology with FIFO batch consumption.
Google Play →MPay
PPOB / bill-payment platform (OVO-style). Kotlin front end and Java backend for bill payment and top-up flows, built during tenure at PT Tadana Raya Dwarsa.
View Project →Calcpad
Terminal-based calculator with coding capabilities. Built with Rust for performance and reliability.
View Project →Primbon Java
React-based web app combining traditional Javanese Primbon divination with modern AI (GLM-4) for Weton, Compatibility, and Life Guidance insights.
View Project →Project Client Base
Client projects delivered under contract — ended engagements across web and Android platforms.