I build the platform. Then I run the business with it.
stephenumunna.com | scumunna@gmail.com | (323) 917-1875 | LinkedIn
Three-sided AdTech business: consumer marketplace, programmatic advertising, and first-party data platform. I hired every team member, built the technology, ran the P&L, and grew the client base from zero to 200+ simultaneous accounts. 85% client retention with zero long-term contracts. 85% gross margins where the industry averages 45%.
Programmatic advertising platform (~125 employees). #1 performer out of 22. up to $1.2M/mo in ad spend. Built tools that elevated the entire organization.
- Python Automation Suite: 4 tools with video walkthroughs. Before/after visualizations, interactive KPI grid
- CTV Measurement Framework: Time-to-conversion analysis, 5-7 day reduction for Thomas J. Henry
- How I Work: Operating principles, daily workflow, tooling stack, honest tradeoffs
- AI Engineering: Claude Code, Codex, Cursor, Copilot, Vercel AI SDK, Gemini, MCP
- Stanford BIOE 230 Interactive: Learning platform adopted by Stanford Bioengineering. 180 interactive visualizations, contextual tutor, 960 practice problems. 3 playable demos on the portfolio page.
- CartoChrome Health Score: Rates every US ZIP code 0-100 for healthcare access. Interactive ZIP lookup with animated gauge. cartochrome.com
- Nuvestan: Personal finance for first-generation wealth builders. Interactive opportunity cost calculator, 2021 to 2026 rebuild toggle. 226 tests.
- CourtVision: Full-stack NBA analytics. 441+ pages, 90+ components, 6 data sources.
| Period | Company | Role | Highlight |
|---|---|---|---|
| Apr 2025 to Mar 2026 | Confidential AdTech Startup | CTO / Acting COO | Hired 15 people, 950K-line platform, 85% margins, 200+ simultaneous accounts |
| Jun 2019 to Mar 2025 | Causal IQ | Sr. Account Ops Manager | #1 of 22, up to $1.2M/mo, tools adopted department-wide |
| Mar 2015 to Nov 2018 | DoveMed | Dir. of Operations (NA) | Led 10-person team, 2K to 500K MAU |
| Sep 2014 to Jun 2019 | RE/MAX | Dir. of Research & Tech | Python automation for 120 agents |
B.S., Molecular & Cellular Biology, University of Illinois at Urbana-Champaign