Primary
Hotel Website
Rambutan Hotel
Hospitality website concept focused on room presentation, destination atmosphere, and a cleaner booking-oriented guest journey.
Backend engineer based in Sydney
Building platforms that actually hold up
Building scalable backend systems, automation pipelines, and production-ready web platforms with strong architecture discipline.
5+
Years building
10+
Production launches
Backend systems
Core focus
// production profileconst engineer = { name: "Yoseph Indra John Saputra", role: "Backend Engineer", focus: ["APIs", "automation", "platform delivery"], location: "Sydney, Australia", status: "available for selected freelance work",};// current prioritiesdeploy({ infrastructure: ["AWS", "Docker", "Kubernetes"], appLayer: ["Next.js", "Laravel", "Node.js"], database: ["Postgres", "Redis"], result: "reliable systems at production scale",});
Available for freelance and remote contracts
Stack
Tools used to ship production-ready systems
Frontend
React.js
Next.js
Vue.js
Tailwind CSS
Backend
Node.js
Laravel
Spring Boot
REST APIs
Database
PostgreSQL
MongoDB
Redis
SQL Server
DevOps
Docker
Kubernetes
AWS
CI / CD
5+
Years engineering
About
I build things that actually scale
I'm Yoseph, a full stack developer based in Sydney with a strong focus on backend architecture and distributed systems. The work sits at the intersection of clean engineering and practical product thinking.
From event-driven services to complete web platforms, the goal is consistent: maintainable systems, clear operational visibility, and delivery that survives beyond launch week.
API Architecture
Microservices Design
Backend Performance
DevOps Practices
System Observability
Full Stack Delivery
Experience
Where I've done the work
Full Stack Developer
Bank KEB Hana Indonesia
Led frontend transformation and backend architecture improvements for core banking web platforms, handling high-volume transaction processing and internal engineering tooling.
Spearheaded complete website redesign using React, reducing bounce rate by 40%.
Migrated legacy PHP applications to Next.js, cutting page load time by 60%.
Designed and implemented microservices architecture for core transaction flows.
Built internal automation tooling that eliminated 20+ hours of manual ops per week.
Introduced CI/CD pipelines with Docker and GitHub Actions across 3 product teams.
Freelance Engineer
Independent - Various Clients
Delivering end-to-end engineering for clients across hospitality, events, e-commerce, and community sectors, from rapid MVPs to production-grade platforms.
Built AI chatbot platforms using LangChain and GPT-4 with custom RAG pipelines over private knowledge bases.
Developed booking and reservation systems with real-time inventory management.
Shipped 10+ production websites with SEO-first architecture and Lighthouse scores above 95.
Designed and deployed e-commerce platforms on AWS with automated scaling.
Projects
Selected work
Real client and product work across hospitality, finance, e-commerce, and community platforms, with the current flagship piece featured first.
New
E-Commerce
Cartaroo
Automation-focused e-commerce work connecting product sourcing, listing flow, and storefront operations into a faster, lower-manual-effort pipeline.
Client Work
Digital Top-Up Platform
TopUpHemat.id
Built a digital top-up platform with a Next.js frontend, Laravel backend, Midtrans payments, and JavaScript automation scripts using Playwright to monitor supplier listings, detect discontinued products, and trigger purchasing flows through Digiflazz and other suppliers.
Client Work
Faith-Based Organization
GBI Miracle Service Sydney
Digital presence refresh for a church community, improving online communication, content delivery, and the overall virtual service experience.
Enterprise
Banking Platform
Hana Bank Indonesia
Contributed to a major digital transformation initiative focused on modern customer experience, frontend delivery, and Spring Boot-backed banking systems.
Client Work
Restaurant Website
Euna Italian Restaurant
Restaurant brand and website build designed to present the menu, atmosphere, and customer journey with a polished hospitality-first feel.
Client Work
Furniture Website
Armada Orient Furniture
Digital storefront for a boutique furniture supplier, built to showcase product categories and support a smoother customer buying journey.
Legacy
Personal Wedding Website
Indra Wedding
A personal wedding website built as a digital event hub for RSVPs, schedules, guest information, and photo memories. An older project, but still an important milestone.
Skills
Technical proficiency
Open to freelance and remote contracts
Have a project worth building?
Complex APIs, platform rebuilds, automation systems, or a full product from zero. The work starts with architecture discipline and ends with production delivery.
Contact
Get in touch
Have a project, a contract, or an engineering problem that needs cleanup? Reach out directly.
Email
indrajohn2@gmail.com
GitHub
github.com/indrajohn
LinkedIn
linkedin.com/in/indrajohn
Location
Sydney, Australia