I build full-stack software, with backend systems that keep data moving.
Full-stack engineer in Salt Lake City with a backend focus and more than a decade in IT. I started in technical support, moved through systems administration, and now build production software, so I understand the whole stack, from front ends and APIs down to the servers and cloud they run on. Open to full-stack, backend, and platform roles.
Experience
Planned break
Took time to travel through Thailand, Laos, and Vietnam. My wanderlust is satisfied, and I am excited to take my career to the next level.
Software Engineer II, BAE Systems
Full-stack, Hill AFB, UT (hybrid)
- Built and modified React front ends for internal web applications.
- Wrote Node.js and Python APIs with unit tests.
- Wrote stored SQL queries used dynamically by applications.
- Worked with ArcGIS on mapping layers for web applications.
Software Engineer, Overseas Military Sales Corporation
Full-stack, remote
- Designed and built a web scraper that fetches, parses, and processes vendor CSV files into our systems.
- Built AWS Lambdas in Python and Node.js for cron jobs, business-event reactions, API replacements, and monitoring and alerting.
- Wrote Java (WildFly, formerly JBoss) APIs for data aggregation, email and SMS survey delivery, and data processing.
- Updated the Angular sites to serve .webp images using a fallback hierarchy of image types, and automated conversion of the images stored in S3.
- Tested with JUnit, Mocha, Python unittest, and Postman.
Platform Engineer Intern, Stride Inc.
Remote
- Researched, designed, built, and tested a data-reconciliation module in Java.
- Wrote Serverless Framework YAML to automate deployment to AWS.
- Wrote Liquibase scripts to manage Postgres database schema changes.
Software Developer Intern, Manic Kat Records
Web and mobile, remote
- Designed, built, and tested a web admin site for the company's mobile app.
- Fixed bugs and added features in the existing mobile app.
- Established SDLC and development practices for the coding team.
Support Engineer (Systems Administration), Goldman Sachs
Salt Lake City, UT
- Administered Windows and Unix (RHEL) systems, including users and computers.
- Automated repetitive tasks with shell scripts.
- Kept the team knowledge base accurate by correcting and adding processes.
Technical Support Specialist, CSS Corp
- Helped non-technical users with a wide range of computer and network problems.
- Removed malware, created data backups, configured networks, and set up email clients.
Technical Support Specialist, Vantiv Integrated Payments
- Troubleshot hardware, software, and networks for card-payment solutions.
- Performed in-depth financial reconciliation to rule out technical errors.
Education
B.S. Computer Science, Southern New Hampshire University
Software Engineering concentration, 3.82 GPA
Skills
- Languages
- Java, JavaScript and Node.js, Python, SQL, Bash, PowerShell
- Front end
- React, Angular, Bootstrap, HTML, CSS, responsive design, ArcGIS mapping layers
- AWS
- Lambda, S3, CloudFront, Route 53, DynamoDB, SQS, SNS, CloudWatch, Secrets Manager, EC2
- Azure
- Function Apps, Cosmos DB, Azure Artifacts
- Data
- Postgres, MySQL, MongoDB, DynamoDB, Liquibase schema migrations
- Systems
- Windows and Unix (RHEL) administration, networking, troubleshooting, shell scripting and automation
- Practice
- Unit and integration testing, API design, git, Atlassian tools, Azure DevOps, Linux, macOS, Windows
Projects
This site: three iterations
I have rebuilt my portfolio three times, each time to fix a specific problem. It now costs very little to run and loads quickly worldwide because CloudFront caches it close to each visitor.
- Version 1: Node.js, Express, and EJS on Amazon Lightsail (source). A full server for a low-traffic site, which cost money every month and was more than the job needed.
- Version 2: Plain HTML and CSS on S3, CloudFront, and Route 53 (source). After a cost and traffic analysis, I removed the server entirely, which cut the cost immediately and made the site faster.
- Version 3 (this site): A redesigned front end with no external dependencies, deployed by GitHub Actions that sign in to AWS with short-lived OIDC credentials instead of stored keys (source).
Earlier work
- 3D scene in C++ and OpenGL, with lighting, texture, and free camera control.
- Inventory management system in Java with JDBC and MySQL.
- Weather app in Node and Express using the OpenWeatherMap API.
- Todo list with Node, Express, and MongoDB.
Contact
The best way to reach me is ianrhefflefinger@gmail.com. Outside of work I mountain bike, ski, climb, play ultimate frisbee, and am slowly learning guitar.