Sina Serati
codingsina@gmail.com
615-720-4902 linkedin.com/in/codingsina
Senior Software Engineer with 10+ years of experience building event-driven and immutable systems in Python on AWS. I design append-only, audit-friendly data models and apply event sourcing & CQRS so teams can ship resilient features with strong traceability and self-healing flows. Collaborative, product-minded, and comfortable leading cross-functional efforts in payments, billing, and data platforms.
| Sure — Sr. Software Engineer | Jan 2024 – Present |
Modernized the payment service to orchestrate across multiple gateways, enabling new credit card and ACH rails.
Enhanced billing with immutable domain events; introduced event-sourced aggregates to enforce business rules.
Designed append-only schemas and temporal tables to ensure compliance, replayability, and historical traceability.
Implemented event-driven, self-correcting flows for failure recovery, voiding, and idempotent re-processing.
Added check ingestion pipelines and standardized domain events for downstream consumption.
| Sure — Software Engineer | Oct 2022 – Jan 2024 |
Scaled the rating engine with self-service configuration, moving from one state/month to multiple states/day.
Built data ingestion with Python/Pandas and CSV processors; introduced immutable storage for rating results.
| Evernorth (Cigna) — Sr. Software Engineer | Apr 2021 – Oct 2022 |
Built a self-service data platform on AWS Lambda, API Gateway, DynamoDB; authored domain-driven APIs.
Established append-only event logs and immutable ingestion patterns; applied Step Functions and SQS for control/throughput.
Advanced Data Mesh practices (data as a product, fine-grained security, discoverability via metadata).
Implemented observability/alerting with Splunk and WebEx hooks.
| Cigna — Application Developer Advisor | Jan 2017 – Apr 2021 |
Built Python Flask middleware and ReactJS front-ends; deployed on OpenShift (Kubernetes + Docker) with GitLab CI.
Automated data migration using Beeline/Hive workflows.
| MTSU — Computer Science Tutor | Jan 2017 – Apr 2021 |
Tutored CS1/CS2 students; simplified core programming concepts and data structures.
| Caterpillar Financial Services — IS Intern | May 2016 – Jul 2016 |
Configured load balancer for XML retention project; built Tomcat-based HTML status dashboard.
Languages/Frameworks: Python, Django, Flask, FastAPI; event sourcing patterns
Architecture: Immutable schema design, event stores, CQRS, temporal tables, idempotency, domain aggregates
AWS: Lambda, SQS, EventBridge, API Gateway, DynamoDB, Step Functions
DevOps/Observability: Docker, GitHub, OpenShift/Kubernetes, Datadog, Splunk
Practices: DDD, TDD, Agile/Kanban, peer reviews, mob sessions