Arsenio Colón

Buffalo, NY

Arsenio Colón

Software Engineer - Backend & .NET Systems

I’m a .NET engineer in Buffalo. Most of my work is backend and internal platforms, the kind of thing other teams end up depending on without thinking about it. Right now I’m at Seneca Gaming, where I take ownership of our internal SharePoint IAM platform, built a visual IT Reporting and Incident Dashboard for leadership, and help out with Nintex/WEBCON workflows. I want to be more proactive and less reactive with day-to-day engineering.

I got my start making games for jams, and did AR/VR work for a few years while weaving in front-end and backend web development in my day to day.

WorkLinkedIn

Languages

  • C#
  • SQL
  • JavaScript

Platforms

  • .NET 10
  • ASP.NET Core
  • EF Core
  • SQLite
  • Azure
  • Kubernetes
  • IIS

Tools

  • Azure DevOps
  • Datadog
  • Git
  • Claude Code
  • Unity

How I work

I use AI tooling every day, mostly Claude Code CLI. It’s good for scaffolding, big refactors, and finding my way around code I didn’t write. It’s changed my workflow from thinking about coding to thinking about how Systems and People work together.

Work

2018 to now

  1. Present

    Software Developer II

    Seneca Gaming CorporationCurrent

    Full-time · Hybrid · Niagara Falls, NY

    • Own the IT service reporting platform end to end: .NET 10, ASP.NET Core and SQLite with Cisco Webex Contact Center and TOPdesk integrations, from architecture through IIS deployment. It complements the monthly Word report that goes out by email with live views managers and leaders can arrange for themselves.
    • Built the organization’s first CI/CD pipelines on on-prem Azure DevOps, with automated tests on every push and approval-gated deployments for two applications.
    • Migrated the legacy SharePoint access-control application to a new production schema, reworked its UI/UX, and shipped features that had been asked for a long time.
    • Support and extend SharePoint applications wired into in-house IAM systems in C#, JavaScript, SQL and Nintex Workflow.
    • Handle analysis and defect triage on the Nintex to WEBCON conversion, and build out the new WEBCON workflows.

  2. Technical Engineer III

    M&T Bank

    Contract through Acara Solutions · Hybrid · Buffalo, NY

    • Built .NET automation on top of Automic that scanned Windows VMs for the incoming keyword files the derivatives team worked from.
    • Automated the upload of relationship manager data into Calypso, replacing a manual process in the derivatives data workflow.

  3. Software Engineer II

    ACV Auctions

    Full-time · Remote · Buffalo, NY

    • Worked on the .NET Payment and Order microservices behind ACV’s online vehicle auctions, handling around 2,000 transactions a day.
    • Migrated alerting and monitoring off New Relic and onto Datadog, which took a lot of the noise out of on-call.
    • Took on-call rotations, triaged incidents, and watched system health.
    • Took 2nd place in ACV’s internal hackathon with a Unity VR tower-defense prototype built on Meta Quest 2 hand tracking and passthrough.

  4. Software Engineer I

    M&T Bank

    Full-time · Hybrid · Buffalo, NY

    • Built and maintained internal Windows and web applications in C#, MS-SQL and Angular, using an Entity Framework Core code-first approach for schema migrations.
    • Kept legacy and third-party applications running, covering support and incident response.
    • Selected for M&T’s “EquityOne” sponsorship program recognizing high-potential internal leaders; engaged in mentorship and leadership training to advance career development.

  5. Software Developer

    RED-INC

    Research and Engineering Development, Inc. · Full-time · Hybrid · Buffalo, NY

    • Built AR/VR training modules for the U.S. Navy in Unity and C# with the XR Toolkit, putting instructional overlays on real equipment through object recognition on Microsoft HoloLens and HTC Vive.
    • Planned and estimated work in Atlassian tools alongside a cross-disciplinary team.

  6. Software Developer

    Campus Labs

    Full-time · On-site · Buffalo, NY

    • Built and shipped backend services in C# through Azure DevOps pipelines for high-traffic higher-ed platforms.
    • Maintained Baseline, an ASP.NET assessment platform used by more than 1,400 institutions, and fixed production issues alongside PMs and support.

Education

2015 – 2017

B.S. Computer Information Systems

SUNY Buffalo State University

  • Teaching assistant for Database Systems (SQL and Oracle) and Intro to Computer Information Processing.
  • Senior seminar capstone shipped as a playable game and was shown at three regional conferences.Buffalo State SRCC 2017 · PDF 12MB

Community

  • Secretary, Board of Directors

    Buffalo Game Space

    A 501(c)(3) supporting local game developers and digital artists. Organized workshops and mentored Unity and C# developers.

    “Buffalo is in a real great need for developers, musicians, artists. And like, I don’t think that’s gonna stop any time soon.”

  • Tech Talks and Tech Academy mentoring

    M&T Bank

    Ran internal workshops and mentored people moving into engineering.

  • Touchdown for Teachers

    M&T Bank

    Volunteer program getting supplies and support into local classrooms.

    LinkedIn

  • Teaching computer science to middle schoolers

    Code.org curriculum

    Designed and delivered an eight-week course introducing students to computer science.

Side Projects

Unity games built for jams and hackathons between 2016 and 2023, including a VR tower defense that took second place at ACV’s hackathon.

See all

Contact

I’m around if you want to talk about a role.