Ellion Blessan

Ellion Blessan

Software engineer building and hardening the systems fintech and web platforms run on — API design, asynchronous processing, and infrastructure automation, based in Jakarta.

Jakarta, Indonesia 2+ years, fintech & large-scale platforms
LinkedIn ↗ GitHub ↗
Experience

Where I've built

Jun 2025 — Present

Software Developer

InternetBrands
  • Migrated a legacy AngularJS front-end onto a modern Ruby on Rails stack, improving maintainability and developer productivity.
  • Refactored a Kafka-based Salesforce integration from a deadlock-prone async workflow into batched processing — reduced database lock contention and improved reliability.
  • Forked and modernized a custom Terraform provider to the latest SDK, with an automated Jenkins build/release pipeline to a private registry.
Oct 2024 — Jun 2025

Software Engineer

Indodana Finance — fintech / lending
  • Built a backend scheduling system to automatically enable or disable service functionality, cutting manual operational intervention.
  • Developed and optimized RESTful APIs with advanced filtering and aggregation across multiple microservices, powering real-time dashboards.
  • Shipped a high-performance promotion validation system with Redis-cached eligibility filtering for low-latency checks at checkout.
  • Refactored I/O-heavy synchronous database workflows into batched async processes, reducing main server load and improving throughput.
May 2024 — Oct 2024

Software Engineering Trainee

Sea Labs Indonesia
  • Built a clean-architecture REST API (Go + Gin) for an online medicine store in an Agile team.
  • Optimized product search, cutting latency by roughly 77%.
  • Containerized services with Docker Compose, including a monitoring and logging stack.
Selected projects

Case studies

Review Aggregation Service

Laravel · JSON:API · AI

Backend API that unifies review data from 3 separate business units into one service, consumed directly by each business unit's own app. Handles AI-powered summarization and categorization of reviews, with an observability layer tracking each AI run's status and retries.

Single reviews API serving 3 business-unit apps

Electronic Medical Record System

Laravel · MySQL · MongoDB

Backend and REST APIs for an EMR platform, integrated with Indonesia's national SATUSEHAT platform to meet Ministry of Health interoperability requirements.

Compliant with Kemenkes SATUSEHAT interoperability standards
github.com/itsLeonB/rekam-medis-elektronik ↗

Cashus

Go · React

Split bills effortlessly with friends. Snap a photo of a receipt to auto-extract line items, divide costs fairly across any group, and always know who owes who with real-time balance tracking and a full expense history.

cashus.online ↗

RemajaSehat

Kotlin · Android · MVVM

Teenage health app with early detection for stunting risk, built with a small team on a clean MVVM CRUD architecture.

Early-detection health screening for teenagers
github.com/itsLeonB/si-capstone ↗

Salesforce integration refactor

Kafka · Event-driven · Batch processing

A subscription-to-Salesforce sync was hitting deadlocks under load. Rebuilt the producer/consumer flow to publish and consume in bulk against Salesforce's Bulk API.

Deadlocks eliminated, lock contention down

Kafka provider modernization

Terraform · Kafka · Jenkins

An outdated, custom-forked Kafka topic/schema-registry provider was blocking upgrades. Modernized the fork and stood up an automated CI/CD pipeline for it.

Automated build & release, no more manual provider updates
Toolbox

Skills

Languages
GoPHPTypeScript SQLRubyJava Elixir
Frameworks
LaravelReact Ruby on RailsSpring FrameworkExpress.js
Infrastructure
DockerKubernetesRedis Kafka / message brokersJenkinsGoogle Cloud Platform
Education & certification

Background

Institut Teknologi Sepuluh Nopember

Sep 2020 — Feb 2024

Bachelor's degree in Information Systems, GPA 3.85 / 4.00 (Cum Laude).

Best Cumulative GPA & Best Final Year Project — Information Systems Dept.

Google IT Automation Certificate

Aug 2023

Task automation with Python; managing IT resources and solving real-world problems at scale. View credential ↗