Rabbil Yasar Sajal

Software Engineer · Product Builder · Python

I build backend systems, developer tools, and AI-powered products that solve practical problems.

Portfolio · LinkedIn · Dev.to · Email

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Building

EnvShield A developer tool for managing environment configuration as a version-controlled contract, with schema validation, secret scanning, and Git enforcement.

JossJobs An AI-powered job intelligence system that turns noisy job postings into structured, evidence-backed opportunities. The pipeline handles discovery, extraction, eligibility assessment, fit scoring, and ranking while minimizing unnecessary LLM usage.

KemonChilo A restaurant customer intelligence and service recovery platform. Customers provide feedback through QR/NFC, while restaurants get real-time alerts, AI-powered issue classification, operational insights, and structured service recovery workflows.

Agentic Engineering

I'm interested in using AI agents as engineering tools, not just chat interfaces.

I've been experimenting with:

• Claude Code and agent-driven software development
• Playwright-based browser automation and testing
• MCP-based agent tooling
• Agentic UI testing and verification
• Benchmarking agent workflows and tool usage
• Designing workflows that keep deterministic logic outside the LLM
• Using AI where it provides leverage without turning the entire system into an LLM dependency

Engineering

I mostly work with:

Python Flask Django PostgreSQL Docker AWS Terraform Pytest Playwright

I'm particularly interested in:

• Backend architecture and APIs
• Developer tooling
• AI-assisted software development
• Agentic systems and automation
• Testing and developer experience
• Turning small ideas into production software

How I build

Solve the actual problem. Keep the system understandable. Automate what should be automated. Use AI where it provides leverage. Don't add complexity without a reason.

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_{Building useful things, one problem at a time.}