Senior Software Engineer · Austin, TX

Santiago Castaneda Munoz

Cross-platform SDK & Platform Engineering

I build cross-platform, cross-language SDKs — and the AI-powered developer tooling that keeps them reliable. Today I own the Unity layer of a production ad-mediation platform shipped in lockstep across Unity, iOS, and Android, and used from independent studios to industry leaders like Zynga.

Santiago Castaneda Munoz
7+
Years experience
200+
PRs merged / year
646K+
Package downloads
26
Public packages
Languages I ship in
C# 52.7% C++ 23.2% JavaScript 12.7% Python 3.1% Dart 2.2% Other 6.1%
About

Engineer at the seam of managed & native code

Senior Software Engineer with 7+ years building cross-platform, cross-language SDKs for the mobile gaming and ad-tech industry. I own the Unity layer of a production ad-mediation platform, shipping features in lockstep across Unity (C#), iOS (Objective-C/Swift), and Android (Java/Kotlin) while keeping the public API surface, versioning, and backward compatibility consistent across all three.

Lately I've been building AI-powered developer tooling — an automated code-review agent and LLM-gated CI — alongside a cross-platform end-to-end test-automation framework, with 200+ pull requests merged in the past year. I'm at my best driving API consistency and release reliability across native platform teams, and — while Chartboost was part of Take-Two — I partnered directly with studios like Zynga and 2K Games to integrate and debug our technologies.

Impact

SDK Adoption — the Chartboost Mediation ecosystem

Public distribution of the mediation & core SDKs, 17 ad-network adapters, and Unity tooling I own — 26 packages across npm and NuGet, adopted from independent studios to leaders like Zynga.

646K+
Total downloads
26 packages · all-time
429K+
npm downloads
all-time
216K+
NuGet downloads
all-time
26
Public packages
SDKs · 17 adapters · tools
Downloads by package · npm · all-time
Mediation SDKAd-network adapterTile area = downloads · hover for detail

All-time npm downloads — mediation SDK + 17 adapters. The Core SDK & Unity tools add ~124K more across 9 packages.

Show data table
Packagenpm downloads (all-time)
MobileFuse57358
BidMachine40972
Mediation SDK32669
AdMob15080
Chartboost14472
Google Bidding14371
ironSource13319
Pangle11790
Unity Ads11662
Vungle11586
Verve11505
AppLovin11364
Mintegral11222
InMobi11193
Amazon APS10530
Meta9833
Digital Turbine8715
HyprMX8138
Experience

Where I've spent 7+ years

Shipping cross-platform SDKs and the tooling that keeps them reliable.

Senior Software Engineer, Unity / SDK Platform · Chartboost

Jun 2022 – Present Austin, Texas

I own and maintain the Chartboost Mediation and Core Unity SDKs — open-source ad-mediation SDKs distributed via Unity UPM and NuGet. My work lives at the seam between managed and native code: I build the C# wrappers that bridge Android (Java/Kotlin) and iOS (Objective-C/Swift) into Unity, and I ship features coordinated in lockstep across all three platforms.

  • Built AI-powered developer tooling — an automated Unity code-review agent and an LLM-based review gate wired into CI, plus custom release-automation skills.
  • Designed a cross-platform end-to-end test-automation framework (Maestro) with TestRail/Allure reporting and BrowserStack device execution.
  • Architected CI/CD on GitHub Actions + Fastlane: a single required PR gate, Slack reporting, self-healing Unity licensing, and iOS canary builds for a Bazel migration.
  • Merged 200+ pull requests in the past year; maintain 20+ public Unity ad-network adapters and cloud-updatable (AWS S3) adapter tooling.
  • While Chartboost was a Take-Two company (through early 2025), partnered directly with Zynga and 2K Games teams to integrate and debug our technologies.
Unity · C#iOS · Obj-C/SwiftAndroid · Java/Kotlin Native ↔ Unity FFIGitHub ActionsBazelClaude Code · LLM-gated CI

Software Engineer, Client / SDK · Tilting Point

Feb 2019 – Jun 2022 New York, New York

Supported every game shipping with the Tilting Point SDK and drove its evolution from a monolithic legacy Unity package into a modular, package-based SDK. Spanned C#, Objective-C, Java, and C++ with deep third-party SDK integration (Leanplum, Amplitude, Adjust, AppsFlyer, Firebase, Helpshift, IronSource).

Shipped titles I contributed to:

SpongeBob: Krusty Cook-Off
SpongeBob
Krusty Cook-Off
Warhammer: Chaos & Conquest
Warhammer
Chaos & Conquest
TerraGenesis
TerraGenesis
Zombieland: AFK Survival
Zombieland
AFK Survival
Languinis
Languinis
M&M's Adventure
M&M's
Adventure
TerraGenesis: Landfall
TerraGenesis
Landfall

Also shipped Sneaker Craft. TerraGenesis and TerraGenesis: Landfall were Tilting Point titles I additionally took on as contractor work — client and store/monetization engineering to help both games hit their release goals.