Nick Sillik — Resume

Summary

I build systems and processes that make entire engineering organizations faster, with iOS depth and full-stack breadth across design systems, developer tooling, and AI-assisted workflows. Most recently at Square, where I drove SwiftUI adoption, built the component library, and established Claude Code-powered development patterns for 150+ product engineers.

Technical Skills

Languages: Swift, TypeScript, JavaScript, Python, Go, Kotlin, Java, C, Objective-C

AI & Agents: OpenAI API, Anthropic API, Claude Code, MCP, agentic development, prompt engineering, custom skills & hooks, automated code review

Platforms & Frameworks: iOS, macOS, tvOS, SwiftUI, UIKit, React, Next.js, Django, Express.js, AWS, Docker, Kubernetes, ELK Stack, Firebase, GCP

Experience

Block, Inc. — Square

Senior Software Engineer, L6 Nov 2023 – Feb 2026 Pittsburgh, PA (Remote)

Contributed to the full rebuild of Square’s design system in SwiftUI, leading the text-input component suite (handling entry, validation, formatting, and accessibility), adopted by all product teams building on the new system.
Built Figma Code Connect specifications for design system components, enabling engineers to generate implementation code directly from designer-approved mockups.
Built a shared data visualization library (pie, donut, line, bar charts) alongside standardized data display components, adopted across multiple seller-facing dashboard surfaces.
Led migration of Square’s items and transactions surface from the legacy UIKit design system to SwiftUI.
Developed Claude Code skills, hooks, and adoption best practices enabling ~150 product engineers to adopt the SwiftUI design system as the standard for new feature development.

Mercury Intermedia

Director of Technology, Connected Devices Nov 2018 – Sep 2023 Reno, NV (Remote)

Defined the technical architecture and strategy for a new connected devices practice, growing the team from zero to 7 engineers across iOS, tvOS, and Roku.
Led iOS, tvOS, and Roku development for a major American sports league’s complete digital footprint rewrite.
Designed the cross-platform API strategy and documented architecture decisions across iOS, tvOS, and Roku; mentored junior engineers through code review and pairing.
Developed a proof-of-concept AirPlay receiver for Android using Apple’s AirPlay SDK, libav, and Kotlin.

Mado / I&Co

Senior iOS Engineer Aug 2017 – Aug 2018 Reno, NV (Remote)

Developed an iPad application with Twilio WebRTC video conferencing, paired with a Django API and Redis-backed Celery task queues.

Omnipotent Gaming

Senior iOS Engineer Aug 2016 – Jul 2017 Reno, NV (Remote)

Integrated ELK Stack with custom Logstash extensions for centralized exception reporting and performance profiling across the iOS application.

Huckle

Senior iOS Engineer Nov 2015 – Jul 2016 Reno, NV (Remote)

Led a large-scale iOS refactor removing tens of thousands of lines of dead code; established code review standards, branching conventions, and release processes adopted across the engineering team.

Inside.com

Senior iOS Engineer Oct 2014 – Nov 2015 Reno, NV (Remote)

Built a reusable app framework enabling launch of 10+ topic-specific applications in hours instead of days; led a ground-up rewrite replacing custom networking and persistence with AFNetworking and CoreData.

Square, Inc.

Software Engineer Aug 2012 – Oct 2014 San Francisco, CA

Architected an offline payment processing system that enabled millions of dollars in transactions without internet connectivity.
Developed the user interface and client APIs for purchasing and claiming gift cards in Square Wallet.

Comcast Interactive Media

Senior Advanced Applications Engineer Aug 2009 – Aug 2012 Philadelphia, PA

Designed an async API library for Xfinity iOS apps, adopted by 7 applications across 3 teams for account, set-top-box, and DVR management.
Built a video player using AVFoundation enabling custom playback UX with DRM, ad playback, and live TV streaming.

MobiTech 3000 — UbiDesk

Software Engineer Jan 2008 – Jun 2009 Cambridge, MA

Temple University

Teaching Assistant, Computer Science Sep 2006 – May 2007 Philadelphia, PA

Education

Temple University — B.S. Computer Science (Honors), 2008 — Philadelphia, PA