What I do
I help teams ship faster, modernize safely, and reduce operational stress across applications, data, integrations, and compliance.
Application development
Modern APIs, internal tools, and automation in Python.
- REST/JSON APIs & backend services
- Event-driven systems (Kafka, Flink, Temporal)
- Internal tools & operational automation
- Performance tuning & modernization
Data engineering
Warehouse design, data modeling, and pipelines that scale.
- Data pipelines with Databricks, Airflow, CDC
- ML training, promotion & deployment pipelines
- Warehouse architecture & lifecycle strategy
- Postgres scaling, optimization & fleet management
- Monitoring & cost optimization
Integrations
Connecting your systems so data moves cleanly and reliably.
- Salesforce & CRM integrations
- APIs between apps, warehouses, and vendors
- Operational reporting & dashboards
- Glue code between internal and external systems
Data compliance
Privacy-aware pipelines and architecture that avoid surprises.
- Data mapping & automated classification
- Deletion & export workflows (right-to-erasure, access requests)
- Compliance-aligned architecture & documentation
- Team enablement & governance best practices
Past impact
- Saved $30K/month via Postgres + Kubernetes redesign.
- 10–50× faster event processing after platform rebuild.
- Automated classification of 10,000+ data points for compliance efforts.
- Cut vendor/infra spend by $400K/year through optimization.
- Reduced 30s API endpoints to 0.7s through redesign.
- Led Python 2 → 3 migration across the engineering org.
- Conference speaker at PGCon (Postgres) and PyCascades (Python).
- Built ML training, promotion & deployment pipelines end-to-end.
About
I'm Selena Flannery, a senior engineer with 10+ years building applications, infrastructure, and data systems at Brex, Patreon, Spotify, Coffee Meets Bagel, and OfferUp.
I help teams build what they need and find what they're missing.
Based in Seattle · Working with teams across North America and Europe
How we can work together
Engagement options
- Advisory / hourly: architecture, debugging, second opinions.
- Fixed-scope projects: apps, pipelines, integrations, compliance workflows.
- Fractional engineering: 1–3 days/week leading app, data, or platform initiatives.