SG.

Senior Software Engineer · Chicago

Shitiz Gupta

Nine years building software that has to be right the first time: systems that authorize card swipes for Capital One, the OCC and McDonald's.

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auth-gateway authorizer healthy
POS Gateway Auth Stand‑in
0years in production engineering
0enterprise clients across cards, clearing & QSR
0languages in the toolkit, Java to Terraform
AWSCertified Developer – Associate

01 — Experience

Where I've shipped

Aug 2023 — Now Capital One via Maven Wave / Atos · Senior Consultant

Card decisioning & secured cards

App development and DevOps across Capital One's secured credit card services and Decide, the platform that orchestrates credit card decisioning.

  • Led and delivered the move of the offer-management batch engine from Scala to PySpark, opening it up to further ML/AI work.
  • Ran the Aurora DMS migration of the card decisioning Postgres database, and trained the incoming engineers who carried out its performance testing and certification.
  • Build and operate services in Java (Spring), Go and Python on Lambda, Docker and ECS/Fargate.
  • Use Claude Code and Windsurf day to day for development and DevOps.
JavaGoPythonPySparkAuroraFargateLambda
Jun 2021 — Aug 2023 Options Clearing Corp. via Maven Wave / Atos · Senior Consultant

Margins & real-time clearing

Full-stack work on TIMS, the Theoretical Intermarket Margins System, at the clearinghouse for U.S. listed options.

  • Built backend (Spring) and frontend (React) features for updating selected positions and PnL calculations.
  • Automated data loads and calculation runs by orchestrating jobs in UC4.
  • Owned DevOps releases for RTC, real-time clearing, with AWS, Ansible, Terraform and Jenkins, and integrated UC4 for scheduled runs.
SpringReactAnsibleTerraformUC4
Feb 2019 — Jun 2021 Capital One via Maven Wave / Atos · Consultant

Card authorization gateways

Built the gateway and all of its infrastructure for Menards' in-store and online credit card transactions, connecting POS to the authorization and payment backends.

  • Migrated an on-premises mainframe authorization app to a cloud-based Java gateway.
  • Built the Stand-In Process Engine that keeps approving within policy when the backend authorizers can't be reached.
  • Wrote a real-time alerting service that matches log patterns and pages PagerDuty when thresholds are crossed, plus a Python health-check service and an automated regression suite.
  • Tested with JUnit, Cucumber and JMeter, over TCP/IP sockets and REST.
Spring BootTCP/IPTerraformCloudFormationJMeter
Feb 2017 — Feb 2019 McDonald's via Sapient Razorfish · Software Engineer

The McDonald's Android app

Shipped the flagship ordering app to the U.S. market: mobile ordering, restaurant geo-services, deals and API networking.

  • Led the core team's UI design and build of the redesigned homepage and ordering screens.
  • Moved the codebase from MVC to MVP for testability, and cut app launch and build times.
  • Personally handled APK uploads to the U.S. app's Google Play listing during my tenure.
  • Used NewRelic data to find and fix performance and stability problems.
AndroidJavaMVPNewRelic

02 — Highlights

Problems worth the trouble

A

Mainframe to cloud

Took card authorization off an on-prem mainframe and onto a Java gateway on AWS, with health checks and regression tests protecting every transaction.

Capital One · Menards
B

Approvals that survive outages

A stand-in engine that keeps authorizing when the authorizers go dark, so checkout lines keep moving.

Capital One · Gateway
C

Scala → PySpark

Led the rewrite of the offer-management batch process so it is ready for ML/AI integrations.

Capital One · Offers
D

Zero-drama database moves

Ran the Aurora DMS migration for card decisioning and brought new engineers up to speed on performance testing and certification.

Capital One · Decide

03 — Stack

Pick a tool, see where I used it

Select a skill to see the roles where I used it.

Education

University of Illinois at Urbana-Champaign

B.S. Computer Science · 2016

Certification

AWS Certified Developer – Associate

2019 – 2021

04 — Contact

Let's build something.

Open to senior engineering roles, contracts, and hard problems in fintech and cloud.

guptastz@gmail.com LinkedIn ↗