Lead IOS swift mobile developer

Nathan Stoltenberg

Senior IOS Developer

214-***-**** ******@*********.*** github Linkedin

**** ****** **** **, ********, CO 80132

Highly accomplished Senior iOS Developer with over 16 years of enterprise and consumer mobile expertise. Expert in Swift, Objective-C, SwiftUI, and Combine, specializing in designing MVVM/VIPER architecture for scalable, high-performance applications. Proven technical leader skilled in CI/CD setup (Fastlane, Jenkins), XCTest/XCUITest, and cross-functional Agile collaboration to drive projects from concept to successful App Store launch, consistently delivering high-quality, optimized code. Recommendations

Recommendation from Chief Product Officer at ContentGuard Recommendation from Product Owner at Sabre Holdings Technical Skills

● Programming Languages: Swift (Expert Proficiency), Objective-C (Legacy/Interoperability)

● iOS Frameworks: UIKit (Imperative UI), SwiftUI (Declarative UI), Combine (Reactive Programming), Core Data (Persistence)

● Networking & Data: RESTful API Integration, JSON Parsing, Asynchronous Programming

(Async/Await, Grand Central Dispatch), Firebase/Datadog integration

● Testing & Quality: Unit Testing (XCTest), UI Testing (XCUITest), Test-Driven Development (TDD), Performance Profiling and Optimization

● DevOps & Tools: Git Version Control, Continuous Integration/Continuous Delivery (CI/CD) using Jenkins, Github Actions, and Fastlane, Xcode IDE expertise, Charles Proxy, Jira

● AI & Machine Learning Tools: Gemini, ChatGPT, Copilot, XCode Predictive Code Completion, Metal Toolchain

● Security & Compliance: Secure Coding Practices, Biometric Authentication (Face ID/Touch ID), OAuth Implementation, Common Cryptography

Employment History

Owner and Lead Admin MineTexas.com 08/2010 - Present

● Scaled the server network from a local project to a global platform played by over sixty thousand players worldwide.

● Managed all server hardware and software infrastructure, including the configuration of multiple Ubuntu servers and a dozen different gaming server types, maintaining 99.9% uptime.

● Developed and maintained community engagement strategies, growing the user base by an average of 15% year-over-year.

● I also contributed to the open source CivilizationCraft Plugin and deployed several iterations on the MineTexas servers and distributed them to other server owners. I added Localization support to the plugin to allow deploying the plugin in other languages. Senior IOS Software Engineer Cytracom 06/2021 - 03/2025

● Established coding standards, CI/CD Pipelines, and automated testing with XCTest and XCUITest suites to help reduce bugs in releases

● Architected and built the ControlOne Network IOS Tunnel application to help companies stay connected outside of the office

● Translated basic designs into full IOS apps, iterating with high fidelity designs, and delegating project components to appropriate team members.

● Built proactive logging using Datadog to detect issues before they were reported

● Leveraged XCode’s predictive code completion model to improve feature delivery speed Lead App Developer Parvati Foundation 04/2022 - 06/2022

● Built a simple app prototype for the Parvati foundation.

● Collaborated with the design team and the volunteer coordinators to meet the requirements laid out in their design document.

Senior IOS Contractor Oscar Tech 07/2021 - 12/2021

● Architected and built an iPhone and Apple Watch app from the ground up, including distribution for beta testing and deployment on the Apple App Store.

● Researched and selected SDKs and frameworks for integration into the project.

● Built a modular OAuth framework for faster authentication integration with new vendors Lead IOS Developer Alkami 01/2016 - 06/2021

● As a mobile developer at Alkami, I was a customer focused, iOS Platform expert driving decisions to best serve our iOS apps and the Mobile banking ecosystem

● I implemented the conversion of several mobile web (HTML) widgets to native swift code, providing a more user-driven, platform-specific experience for the more than ten million users of our applications

● Optimized iOS application code for speed, scalability, and reliability, increasing average review scores from 2.5 to 4.8 stars for all our customers.

● Provided technical guidance and coaching to junior engineers on iOS development best practices and project execution

● Defined and enforced engineering principles, guidelines, and best practices through code reviews and documentation

Senior IOS Developer ContentGuard 05/2014 - 12/2015

● Owned the iOS releases for the team and merged code from additional contractors working on the project

● Collaborated with the back-end team on a system API that supported multiple clients

● Contributed to the enhancement of iOS application quality through rigorous Functional Testing procedures.

Senior IOS Developer Sabre Holdings 01/2013 - 05/2014

● Leveraged advanced Tooling to optimize the iOS development lifecycle and enhance application performance

● Coordinated the development of all client side features

● Conducted customer research to inform feature development and improve user experience for iOS applications

IOS Consultant The Principal Consulting 11/2011 - 12/2012

● I assisted in the design and development of multiple enterprise iOS applications for numerous clients as well as a couple of trade show demos using SAP and other Web Services IOS Developer Fractal Fox Studios 02/2009 - 12/2012

● Wrote the code for several touch based games for iOS and iPad devices

● Compiled all major and minor binary revisions and submitted them to Apple for review and approval to the App Store

● Converted Garden 2 Go Game from the UI-Kit user interface model to the more adaptable cocos2D open source interface, improving load times and package sizes and allowing for the use of sprite sheets, greatly decreasing the workload on our artists Signing Specialist Target 08/2008 - 10/2011

● I ordered, received, distributed, and maintained all the in store signing for Super Target #1517.

● I was also a trainer for both my position, and bike assembly. I was cross-trained for bike assembly, guest service, cashier, electronics, stockroom, pharmacy cashier, in-stocks, planograms, and store-wide ordering.

● Handled device troubleshooting for multiple mobile retail devices including PDA’s and Zebra printers

Core Competencies

● iOS Architecture Design: Expertise in modern design patterns, including MVVM, VIPER, and Clean Architecture, with experience refactoring and migrating legacy code.

● System Scalability: Designing mobile applications for high traffic and large user bases, focusing on modularity, code maintainability (e.g., using SOLID principles), and system stability.

● Performance Optimization: Advanced skills in identifying and resolving bottlenecks, reducing launch times, improving memory efficiency, and minimizing crash rates.

● Cross-Functional Technical Leadership: Acting as a technical authority for cross-platform and backend integration, ensuring seamless API contracts and data flow.

● User Experience (UX) Principles: Deep adherence to the Apple Human Interface Guidelines

(HIG) and collaborating with UI/UX designers (Zeplin, Figma) to implement accessible, intuitive, and consistent user interfaces. Helping conduct user experience and usability testing

● Team Leadership & Mentorship: Leading a small team, conducting Code Reviews to ensure high quality and consistency, and actively mentoring junior developers.

● Agile Methodologies: Extensive experience with Agile/Scrum, including sprint planning, estimation, refinement, and delivering features on bi-weekly cycles.

● Cross-functional Collaboration: Excellent communication and collaboration skills to effectively work with Product Owners, QA, Backend, and Design teams to define project requirements and technical roadmaps.

● Problem-Solving & Innovation: Proactive identification and resolution of complex application bottlenecks, with a demonstrated ability to introduce innovative technical solutions and best practices to improve team efficiency.

● Project Ownership: Taking full end-to-end responsibility for the software development lifecycle, from initial architecture to App Store deployment and post-launch analytics gathering. Education

North Central Texas College 2006 - 2009

Coursework in Computer Science

Awards

Alkami Technology - Mettle Award 12/2019

This Alkamist is a machine passionately cranking out large quantities of quality code for over 4 years. He loves to tackle the most complex technical problems and has a can-do attitude. We recently had an iOS-related RDC issue that was preventing some customers from depositing checks. We were not able to reproduce this issue. Our FIs were not happy. With a one day notice, he jumped on a plane to go to Enrichment to work with an individual that could actually reproduce the issue. He was able to determine the problem and prepare a solution in a couple of hours. To prepare for a trip like this with very short notice and to flawlessly execute took courage, determination, and true grit. Mettle! Recently Apple released iOS 13. Several of our vendors had compatibility issues with iOS 13. There was a widespread fear that people who upgraded would not be able to use our RDC feature. The RDC vendor could not supply us with a compatible version until iOS was released. This puts tremendous pressure on the team to quickly build a compatible mobile release. As soon as the vendors provided updates, this Alkamist jumped into action alongside his team exhibiting Mettle to provide an iOS 13 compatible application. With Optimistic Perseverance, he is a strong advocate for architecting the best possible mobile solutions. With Caring Collaboration he remains flexible when necessary. As a Trusted technical leader he exhibits Courageous Innovation. He is driven to make our Native Mobile apps the best apps on the market. And he likes to have real fun because his candy bowls are never empty. Please help me congratulate Nathan Stoltenberg on this Mettle award!

Sabre Holdings - Technology Champion Award 07/2013 Nathan works on the Sabre Red Mobile Workspace and gives the app the high quality that our customers expect. Nathan understands the business needs, reaches across team boundaries to exceed expectations, inspire others and get things done - on time, every time. Nathan “gets it”. He understands mobile app technology deeply, almost intuitively, end-to-end and from many viewpoints.

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