Hello, I'm

Daffa Pradana

Software Engineer · Backend-Focused

Daffa Pradana

Get to know

About Me

I'm a seasoned backend engineer with 5 years of professional experience specializing in Ruby on Rails, PostgreSQL, Redis, Sidekiq and some familiarities with (GKE) Kubernetes, earlier honing my skills through a brief web programming internship and freelance projects.

I excel at optimizing performance (e.g., slicing response times by 85%, architecting async background jobs to eliminate N+1 query bottlenecks), building robust integrations that fueled contract renewals and new deals, and delivering data-driven features that grew our user base from 150 to 1,574.

Skilled in CI/CD (CircleCI), error tracing (Sentry), testing (RSpec), and data querying (Redash), I'm a fast learner with a growing AI focus and the flexibility to contribute across the full stack when needed.

5+

Years of experience

85%

Response time improvement

Ruby

Primary language

Rails

Core framework

What I've been working on

My Latest Projects

Read case study →

Architecting a Jira Sync Engine for an Enterprise OKR Platform

Designed and owned the domain layer of Happy5 Performance's Jira integration, the sync engine that turns Jira projects, issues and workflow states into enterprise OKR goals, tasks, ownership and live progress. Still the production code path four years later.

Ruby on Rails Jira REST API Sidekiq ActionCable PostgreSQL
Drag-and-Drop Ordering That Survives Concurrency Read case study →

Drag-and-Drop Ordering That Survives Concurrency

Designed drag-and-drop reordering for OKR goals using gap-based float ranking, so moving one item touches a single row instead of rewriting the list. Hardened with row locking after production exposed a real concurrency race.

Ruby on Rails PostgreSQL Sidekiq
Read case study →

Architecting a RAG Chatbot for My Own Portfolio

What curiosity from a workshop turned into: a retrieval-augmented chatbot built from scratch for this site, with its own retrieval, guardrails and rate limits.

Ruby on Rails Groq API Hotwire RAG LLM

Know More About Me

Chat with AI

Suggested questions

Ask me anything about Daffa — keep it short for quick answers.

AI
Hi! I'm Daffa's AI assistant. Ask me anything about his experience, skills, or projects.

My Contacts

Feel free to reach out — I'm always open to a good conversation.

LinkedIn GitHub