Cathal O'Sullivan

Seven years selling to and growing customers: enterprise SaaS first, then the ad platform that game publishers run on.

Qualtrics

NASDAQ: XM

SDR to BD to Senior Business Development Manager · May 2016 to Sep 2018 · Dublin

Outbound enterprise SaaS sales development. Cold outreach, qualification and meeting set-up across 100+ accounts, enabling six-figure deals and closing some of them myself.

2x BDM of the Quarter.

Unity Ads

NYSE: U

Account Manager to Head of Market · Oct 2018 to May 2023 · London · 4.5 years

Unity Ads is the ad network inside Unity. Publishers integrate it into their games, and Unity earns a revenue share on the ad impressions.

I looked after 500+ publishers and studios generating $150M+ a year across the Nordics, UK, Spain and MEA.

$250M+net revenue. $85M in my final year, about 7% of Unity's global revenue.

• Founded Unity's European C-level publisher roundtable.
• Worked with product on Unity's original mediation product.
• Unity's primary contact with IronSource before the acquisition.

Promoted 4xTitles

1. Account Manager
2. Monetization Client Partner
3. Senior Client Partner
4. Head of Market

Accounts I closed at Unity

• Sega
• Wildlife Studios
• Next Games
• Miniclip
• Tripledot
• Popcore
• Take-Two

Publishers I signed or grew on Unity Ads, not companies I worked for.

Talks

• Make Monetization FunPGG London
• Taking your game to the next levelPGC
• Making Money in MobileUnite 2020
• Monetisation Best PracticesUnity Learn

I left the sales side to learn monetization operations day to day and understand the commercial process end to end.

Sandsoft Games

Head of Ad Monetization · Jun 2024 to Oct 2025 · Barcelona

$2.75Mad revenue, about 65% of company revenue.

• Built the ad monetization function from zero across ~12 F2P titles, in-house and published, working with product, publishing and UA.
• Ran commercial monetization audits on publishing targets that fed acquisition decisions.
• Ran the mediation stack across 13+ networks (AppLovin, AdMob, Unity, IronSource, Liftoff). Impressions up 380% to 116M a quarter.
• Took external developers from integration to launch.
• 92 A/B tests, 65 promoted, +9.65% average ARPDAU per promoted test.

Omada

Head of Monetization · Oct 2023 to May 2024 · London

Series B sports social casino. 5M+ downloads, 300k DAU. Owned the IAP economy.

• Set profitability targets and revenue forecasts against company KPIs.
• Negotiated an exclusive ad network partnership.
• Record monthly ARPDAU within three months.
• Designed the economy and a dynamic bundle system. Ran IAP on RevenueCat.

Vela Games

Head of Monetization · Apr to Oct 2023 · Dublin

Flagship PC F2P title, Evercore Heroes.

• Set profitability and KPI targets with the C-suite. Partnered with marketing and product on launch monetization.
• Designed IAP, economy and battle pass on Xsolla.
• Built the LiveOps calendar (promotions, events, influencer campaigns) and fed player feedback into monetization and retention.

Expert consulting on mobile gaming and ad monetization for McKinsey and Slate Path Capital, and go-to-market advice for EncoreKit.

• 
• Slate PathCapital
• 

05Feb 2026 to now

Building

9,447 contributions since March 2026 →

PAPI

Your AI builds. PAPI steers.

Built to help solo builders and teams keep control of AI projects through every prompt, pivot and decision, across any session, model or harness.

users

150+

projects

194

builds

6,770

cycles on PAPI's own record

398

Stats as of 6 Oct 2026. getpapi.ai

One MCP server

No API key, no usage credits. Works in Claude, ChatGPT, Cursor, Lovable, Bolt, Replit, Codex and VS Code.

A loop, not a to-do list

Setup, then Plan, Build, Review, Release, with a strategy review every few cycles.

Decisions on the record

What was decided, what was reversed, and why.

Run by me, open at the core

Self-hosted on a VPS with its own Postgres and auth. The engine is open source under MIT: getpapi/papi. Free for 3 projects, Pro at €20 a month, Team on custom pricing.

“PAPI has effectively reduced the time spent on non-value added work exponentially.”

Built with PAPI

Idle Vibe Tycoon

RevenueCat Shipaton 2026 entry · v1.9 live on Google Play

Five people on four continents, each driving a different AI assistant in its own context window, with no visibility into the others. PAPI's shared board was the only shared memory.

828 tasksshipped in 66 cycles over 47 days.

1. Aug 18Entered
2. Aug 31Closed testing
3. Sep 26Live on Google Play
4. Sep 30Deadline

Play in browserWatch the videoGoogle PlayDevpost

The browser version shares a page with the public build log.

Tasks shipped, by contributor (attributed)

1. Joseph Williams231
2. Manuel Ruiz203
3. Alexander Brandt153
4. Cathal O'Sullivan87
5. Joe Tannoury42

Assistants: Claude Code, Codex, OpenCode, GLM. Models across the run: Claude Opus and Sonnet, GPT-5, DeepSeek, GLM. From the public build log.

The game

You start as a solo coder tapping prompts, hire AI agents (cats in hoodies) and grow through five company stages, from Solo Coder to Software Business. Then you prestige into 100 real skills.

Monetization: RevenueCat IAP, where the premium purchase is PAPI itself. Ads are optional rewarded videos only, through AdMob. OneSignal reminders.

Expo, React Native, TypeScript, Zustand, Firebase.

From the Devpost write-up

“The first session is the whole game.”

“The tutorial has to teach the loop the player actually has.”