Halis B.

I'm a software engineer and Retool developer with 4+ years of experience delivering high-impact solutions in fast-paced environments. I specialize in building scalable backend systems, architecting cloud-native infrastructure, and designing powerful internal tools using Retool. Currently working full-time at a YC-backed ed-tech startup (S18), I lead critical backend initiatives using Python, AWS Lambda, Django, RDS (PostgreSQL & MySQL), S3, SQS, Kinesis, Glue, and Athena. I contribute significantly to our real-time data pipeline and internal tooling efforts, helping various teams make faster, data-informed decisions. On Upwork, I help businesses build custom dashboards, operational tools, and reporting systems with Retool — from support and sales dashboards to admin portals and CRM tools. I combine strong backend expertise with a deep understanding of Retool's capabilities, enabling me to ship full-stack internal tools that solve real business problems. 🔧 What I can do for you: - Architect and build RESTful APIs using AWS Lambda or Django - Design and implement robust data pipelines and integrations - Build custom Retool UIs that connect to your databases and APIs - Create analytics and reporting dashboards tailored to your KPIs - Optimize complex SQL queries and build performant data models - Set up cloud infrastructure using AWS best practices 🧰 Tech Stack: Languages: Python, JavaScript, SQL Backend: Django, AWS Lambda Databases: PostgreSQL, MySQL, AWS RDS, Athena Cloud & Data Tools: S3, Glue, Kinesis, SQS, dbt Frontend / Internal Tools: Retool, JavaScript, Custom Components If you're looking for someone who can build and scale backend systems and deliver intuitive dashboards for your team — let’s talk. I bring a product-focused mindset and care deeply about clean, maintainable code that drives real value.