Hi, I'm Sean Mercier

A software engineer specialized in building awesome web applications.

Skills

Languages:
Python, C#, Java, MongoDB, SQL

Frameworks:
Flask, Entity ORM, JQuery, Vue.js

Cloud/DevOps:
AWS (CodeCommit, Lambda, ECS), Docker, Kubernetes, DigitalOcean

Experience

Senior Software Engineer, Connexus Credit Union – Remote Aug 2021 – Present

  • Led full-stack feature development of internal Institutional Lending applications using AWS Lambda, Python, Flask, Sanic, C# ASP.NET, SQL, and DocDB
  • Architected and implemented a SOAP API wrapper using FastAPI to automate membership creation during loan onboarding, significantly reducing rejection rates and processing time
  • Designed and deployed microservices in Python and Kubernetes for automating loan collateral releases, integrating with Snowflake to streamline workflows and eliminate manual steps
  • Refactored and migrated legacy applications from an Apache NiFi cluster to AWS, replacing workflows with Python-based Lambda functions to improve performance and scalability
  • Drafted architecture for a Loan Sale and Remittance application microservice in AWS

Software Engineer, Skyward Inc. – Stevens Point, WI Jan 2016 – Aug 2021

  • Developed and maintained financial reporting systems using C# and SQL, focusing on scalability and maintainability
  • Conducted code reviews and mentored junior engineers, emphasizing performance optimization
  • Enhanced system reliability by implementing unit tests at the function level
  • Established performance standards for State Reporting systems and collaborated with customers on system design and maintenance requests
  • Maintained high-performance mass processes for users to perform state reporting maintenance on their data
  • Automated software testing processes in C# using Selenium, increasing testing frequency and consistency
  • Documented test procedures and software defects, ensuring compliance with company standards

Projects

Joyful Color AI
  • Built a Flask-based website to generate coloring book pages using pretrained models from Hugging Face.

  • Integrated Auth0 and Stripe for user authentication and payments.

Daily Bread AI (Defunct)
  • Developed a Flask and serverless architecture that sent daily SMS messages with AI-generated motivational images and quotes.

  • Integrated Twilio API for message delivery and automated user management.

Education

Arizona State University

MCS Master of Computer Science
(Expected Dec 2026)

University of Wisconsin – Oshkosh

BS in Computer Science; Minor: Philosophy
(Jan 2016)