Senior Software Engineer · United States

Nathanial
Lubitz

Six years building high-scale systems for millions of users.
Full-stack TypeScript, React & Golang, with a focus on performance and reliability. Scroll through a few things I shipped.
10s → <100ms
Real-time risk engine · Sezzle
−88%
Manual intake automated · Inlight
−98%
API & data-lake latency · Cargill
Authorized to work in the U.S. · Available immediately
Résumé (PDF) ↗ Email ↗ GitHub ↗ Talks ↗ LinkedIn ↗
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Operating at senior level

Years of senior-scope work. Owning critical services, mentoring engineers, and raising the bar across teams.

Mentored 6+
engineers & interns
Led the build
small teams & standalone services
Set the standards
testing, tooling & CI
Talks delivered
Docker, Git & testing, cross-team
2024 – Present · Still building & leveling up

Continuous learning, continuous deployment.

Finished my B.S. in Computer Science and three industry certs, and shipped production-grade self-hosted systems on my own Kubernetes cluster. I never stopped building.
A degree, three certs & self-hosted systems shipped. Still building.
  • Completed a B.S. in Computer Science (WGU) plus Linux, ITIL & AI certifications.
  • Shipped 3 self-hosted production systems on a private Kubernetes cluster. All of that on my own Git server, registry & Grafana.
  • Earned an FAA Private Pilot Licence and traveled across eight countries.
2023 – 2024 · Inlight / UrbanRest · Software Engineer

Automating check-ins

I wired Veriff, Stripe and Salesforce into a NextJS flow so guest check-in filled itself in. No more manual data entry!
Manual data entry down 88%
  • Mentored 2 engineers and led PR reviews & pair-programming on Hostplus delivery.
  • Built a Vercel KV caching layer that cut query times 50%+ and steadied search reliability.
  • Tracked down an availability bug hitting 10% of booking searches and restored inventory accuracy.
2021 – 2023 · Sezzle · Software Engineer

Underwriting in real time.

A Golang service cached millions of ML risk scores into Redis, so "buy now, pay later" decisions happened instantly.
Risk scoring: 10s → 100ms
  • Re-architected the shopper/merchant blocklist into an independently deployable service, retiring 8 legacy entities.
  • Added 40+ Playwright E2E tests to CI and cut local startup 32s → <1s with Vite.
  • Delivered Docker, Git & table-driven-testing talks to lift cross-team engineering standards.
2018 - 2021 · Daugherty / Cargill · Software Engineer

A training game for the kitchen floor.

I led Cargill Kitchen Trainer end-to-end as the sole technical contact. This was a gamified app that taught cooks through missions and lessons, and cleared Cargill's security and risk review.
Sole technical contact · 14 cooks across 4 restaurants
  • Led the Cargill Demurrage Calculator as primary engineer. API latency down by 98% via Redis caching.
  • Cut internal data-lake search 6s -> 0.1s across 400+ databases with ElasticSearch caching.
  • Led 3 engineers on a Walmart white-label app and mentored 3 university interns to completion.
2018 · Magenic / Deloitte · Junior Software Engineer

Tying out the filings, faster.

As a Magenic consultant embedded on Deloitte’s audit team, I built tooling to tie out 10-K and 10-Q filings, reconciling figures across documents automatically.
Audit time cut by 85%
  • Built the 10-K/10-Q tie-out tool embedded on Deloitte’s audit team, leading to a reduction of audit time by about 85%.
  • Decoupled a monolithic service into 6 independent services, cutting monolith code 40%.
Where it started
A long-standing passion, not a recent one.

I'm from Frazee, Minnesota, a town of about 1,000 people, where we didn't have internet at home. From around age ten I taught myself to code at the public library, burning tutorials onto a CD-RW so I could keep studying once I got back.

My first real project was for my dad's mechanic business: a barcode-driven inventory system where he'd scan items in or out and watch his live stock counts update. (It stored everything in an .ini file. Definitely not how I'd build it today, but it solved a real problem, and that’s what’s important)

From there it got formal: an associate's in Mobile Application Development at Central Lakes College. I doubled up to 24 credits one semester and ran the computer club, plus an early hackathon win, Facebook's "Best Social Hack" at ArchHacks 2017. Years later, a B.S. in Computer Science. The through-line from that library CD-RW to shipping systems for millions of users hasn't changed: understand how it works, then build it.

Full timeline
2024 – Present
A year on the move & independent projects · travel + study

Completed a B.S. in Computer Science (WGU) and three industry certs (Linux, ITIL, AI), shipped the self-hosted systems below, earned an FAA Private Pilot Licence, and worked across eight countries.

2023 – 2024
Inlight · Software Engineer · Melbourne

Led Stripe/Veriff/Salesforce check-in automation for UrbanRest (−88% manual entry); mentored 2 engineers and drove delivery quality for Hostplus.

2021 – 2023
Sezzle · Software Engineer · Minneapolis

Built the real-time risk-scoring service (10s → <100ms); re-architected the blocklist into its own service; added 40+ Playwright E2E tests; delivered cross-team tech talks.

2018 – 2021
Daugherty Business Solutions · Software Engineer · Minneapolis

Led the Cargill Demurrage Calculator (API −98% via Redis); cut data-lake search 6s → 0.1s across 400+ databases; led 3 engineers on a Walmart app; mentored 3 interns.

2018
Magenic · Junior Software Engineer · consulting for Deloitte

As a Magenic consultant embedded on Deloitte’s audit team, built 10-K/10-Q tie-out tooling (−85% audit time) and decoupled a monolith into 6 services.

Selected projectsgithub.com/natel97 →
Housing Finder ↗NextJS · Golang · Kubernetes · Grafanaprivate beta

Housing search platform self-hosted on a private K8s cluster with its own Git server, Docker registry, and Grafana logging.

RSVP Service ↗Golang · React · SQLite · Docker

Self-hosted event invitation manager with per-invite links, iCal export, and an admin dashboard.

Wii Remote Browser Library ↗TypeScript · Web Bluetooth · HID

npm library connecting Nintendo Wii Remotes to the browser; reverse-engineered the BLE GATT characteristics.