Ceyda Demir Bal

I’m a Backend Developer with 5 years of experience building scalable microservices and APIs in cloud-native environments. I specialize in Node.js, serverless architectures, and data-intensive systems, and I like owning features end-to-end—from design through production.

At invent.ai, I helped grow an early-stage engineering team from 6 to 20+ engineers. I contributed to the design and maintenance of 20+ AWS Lambda microservices (Express.js) in a multi-tenant architecture, built data ingestion and large dataset delivery using AWS S3 and Azure Blob Storage, and developed backend endpoints for user parameter management, optimization workflows, and reporting dashboards.

I designed and optimized complex SQL (CTEs, window functions, aggregations) on datasets up to hundreds of millions of rows across PostgreSQL, MSSQL, and BigQuery, and implemented Redis-based caching to improve latency on read-heavy endpoints. I also monitored and debugged production using Datadog and Kibana, mentored new backend hires, and supported the team’s transition from Agile/Scrum to squad-based Kanban.