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matias crespillo

@matiascrespillo

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Senior iOS Engineer at Opensignal who rewrote its core SDK for partners worldwide.

Argentina

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At Opensignal, I collaborated on rewriting the core iOS SDK distributed to partners worldwide. I also architected and implemented an internal SDK connecting the public SDK with first-party apps.

At Noom Inc., I led the transition of the primary iOS codebase from Objective-C to Swift and drove its move from a monolith to a modular, reactive system. I also shipped A/B-tested features and led the integration of a customized Amity social platform.

Earlier, I enhanced chat and ad placements at Grindr, and consulted for early-stage startups through Toptal, building iOS products from concept to App Store release. One project was Babelbark, a pet-tracking app integrated with a Bluetooth device.

Experience

Work history, roles, and key accomplishments

Senior iOS Engineer

Opensignal

Jan 2023 - Jan 2025 (2 years)

Collaborated on the architecture and implementation of a full rewrite of Opensignal's core iOS SDK, distributed to partners worldwide. Architected an internal middleman SDK and rewrote two first-party applications using Swift Concurrency, TCA, and SwiftUI.

iOS SDK Swift SwiftUI Swift Concurrency TCA Architecture Architecture

Senior iOS Engineer

Noom Inc.

Jan 2018 - Jan 2023 (5 years)

Led the transition of Noom's primary iOS codebase from Objective-C to Swift, starting as the first and sole iOS engineer on the initiative. Designed and drove the migration from a monolithic architecture to a modular, reactive system, improving build times, scalability, and testability.

iOS Swift Objective C Modular Architectures Reactive Programming A B Testing Mentorship

iOS App Developer

Grindr

Jan 2016 - Jan 2018 (2 years)

Implemented new ad placements for free users, directly contributing to increased revenue. Enhanced core chat functionality, including support for GIFs and message reactions.

iOS Test Driven Development Agile Chat Ad Placements

iOS Development Consultant

Toptal

Jan 2014 - Jan 2016 (2 years)

Consulted for early-stage startups, often joining at ideation stage. Built multiple iOS products from concept to App Store release, including a pet-tracking application integrating with Bluetooth devices.

iOS Product Development Bluetooth app store