# Stefan A.

> Senior Software Engineer

Location: Ann Arbor, Michigan, United States
Profile: https://flows.cv/stefana1

I'm a software engineer with 12+ years of experience ranging from small startups to Fortune 50 companies. I work thoughtfully to solve complex problems. I’m an effective communicator and strong team player. My current focus is on application development, architecture, and maintenance on backend systems.

I have extensive experience implementing robust and stable solutions rooted in industry best practices. I’ve built projects from the ground up and also jumped into codebases of apps used by thousands of DAUs. I've shipped solutions that touch tens of millions of records of highly-trafficked tables in production databases with no adverse effects or downtime. I understand the implications of solving problems at scale. Recently, I led an integration API upgrade of a crucial payments flow handling transactions topping millions of dollars per month.

## Work Experience
### Senior Software Engineer @ ActBlue
Jan 2023 – Present | United States
• Led payments orchestration integration project using Ruby on Rails for card data tokenization that shipped to production, saving hundreds of thousands on PCI-DSS compliance costs
• Led mission critical payment processor API upgrade and architected asynchronous processing unlocking ACH payments, saving $4 million on processing costs, leading team collaboration
• Implemented automated handling for chargebacks; authored and executed script moving $80,000

### Senior Software Engineer @ Evidation
Jan 2022 – Jan 2022 | San Mateo, California, United States
• Co-led project implementing a points expiration system using Ruby on Rails, reducing company cost liability by $200,000; shipped early with no downtime in continuous collaboration with stakeholders
• Led a 5-member tiger team to address gaps in users' data from iOS libraries, restoring data accuracy to 100% by modernizing legacy code

### Software Engineer @ Evidation
Jan 2021 – Jan 2022 | San Mateo, California, United States
• Integrated OneTrust for CCPA compliance, automating “Right to Know” and “Right to delete” data privacy requests in close collaboration with product, saving the team over 4 weeks of manual work
• Improved application performance by 10-15% via refactoring and monitoring API endpoints, identifying N+1 queries in PostgreSQL, enhancing the main card view in the mobile app

### Lead Software Engineer @ Apex Systems
Jan 2020 – Jan 2021
Assignment: Lead Software Engineer, OneMain Financial - Chicago, IL (Remote) — 2020–2021
• Mobile engineering: native iOS application using Swift 4.x and Storyboards
• Rewrote navigation engine to MVVM-C pattern unlocking deep linking and increasing user engagement
• Greatly improved app logic according to SOLID principles, best practices for iOS/Swift codebases
• Spearheaded implementation of consistent code styling, class responsibilities/boundaries resulting in less developer cognitive complexity

### Senior Software Engineer @ Slice
Jan 2019 – Jan 2020 | New York, New York, United States
• Led migration from SQS to open-source RabbitMQ, eliminating service costs; became internal RabbitMQ subject matter expert
• Created a microservice to ETL restaurant data into Elasticsearch to improve search results and UX
• Led implementation of web-to-app transfer of a user’s cart, increasing mobile user retention
• Spearheaded documentation of 100% of existing REST API endpoints on Rails monolith garnering multiple accolades from other engineers

### Software Engineer @ Integral.
Jan 2018 – Jan 2018 | Greater Detroit Area
• Mobile engineering consulting: React Native and native iOS SDKs; worked on-site at a large automotive client
• Extensively pair-programmed and adhered to test-driven development to ensure quality of product
• Implemented turn-by-turn navigation UI and engine
• Implemented binary interface between React Native and Swift to enable deeper integration with iOS capabilities within the app

### iOS Software Engineer @ Trove AI
Jan 2017 – Jan 2018 | Ann Arbor, MI
• Mobile engineering: native iOS application using Swift 3 and 4
• Implemented text box for chat UI and enabled unicode support for messaging
• Adopted MVVM-C paradigm to standardize and provide robust in-app navigation engine
• Transitioned legacy Objective-C codebase to Swift enabling interoperability with existing app engine
• Traveled extensively & worked remotely from Europe and South America for several months

### Software Developer @ Service.com
Jan 2013 – Jan 2017 | Greater Detroit Area
• Mobile engineering: native iOS application using Objective-C then later Swift
• Primary developer for iOS mobile app for telematics/fleet tracking to show locations of workers and vehicles on a map view
• Integrated with iCMP (EMV) Bluetooth readers to enable in-app payment acceptance
• Backend engineering: implemented integrations with third-party services to enable marketing and engagement strategies

### Software Quality Assurance Intern @ Urban Science
Jan 2012 – Jan 2012
• Automated testing development: C#, Visual Studio 2010 Test, SeleniumUI 
• Developed test automation to verify several web apps under one automation framework
• Wrote test strategies and reports


## Education
### B.S. in Computer & Information Science in Computer Science
University of Michigan-Dearborn
Jan 2009 – Jan 2013


## Contact & Social
- LinkedIn: https://linkedin.com/in/sarambasich

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Source: https://flows.cv/stefana1
JSON Resume: https://flows.cv/stefana1/resume.json
Last updated: 2026-03-22