Daniel Fullerton.

Software Engineer  —  Microsoft · Commerce

Atlanta, GA

Daniel
Fullerton.

Software engineer at Microsoft on the Commerce team. I own the near-real-time reconciliation and billing infrastructure behind a mission-critical, SOX-regulated commerce platform that processes billions of billing events a month and has to close each month at 100% accuracy. Day to day that means Scala and Spark on Azure, reconciliation pipelines, livesite on-call, and the security and cost work that keeps a financial system trustworthy.

Before Commerce I spent two years in big-data platform engineering — GraphQL data APIs, data governance and lineage, and Spark-based data-quality libraries. Earlier I built retail operations apps at T-Mobile (Java/Spring, Angular) and talent-management platforms at Randstad (TypeScript, Node.js, Google Cloud). B.S. in Computer Science. I lean heavily on modern AI tooling to move fast without giving up rigor.

Work

Selected work

Figures generalized — no customer names or internal identifiers.

  1. →01

    Near-real-time charge reconciliation

    Owner · Commerce billing platform

    I own the reconciliation layer for a commerce platform that processes billions of billing events a month across nine processing units and multiple Azure regions. I built automated dropped-event detection and replay, and hardened the alignment and comparison logic that keeps open and closed orders in agreement.

    ~10k dropped events/mo → 0100% reconciliation accuracybillions of events / month
  2. →02

    Legacy pipeline shutdown & streaming cutover

    Multi-quarter program

    Led the cutover of hundreds of thousands of billing groups off a legacy consumption pipeline onto a new streaming-sourced path — standing up processing and reconciliation infrastructure across regions and running auditable, financially-tiered batch cutovers with disciplined rollback when discrepancies appeared.

    100s of thousands of billing groups100% accuracy at closezero SLA breaches
  3. →03

    Livesite, reliability & cost

    On-call DRI · platform operations

    As the on-call directly-responsible engineer, I'm the person the pager wakes. I run calm, telemetry-driven root-cause analysis on production incidents, hold the line through the highest-stakes week of every month at close, and mentor teammates through their first on-call rotations. Alongside that I cut recurring cloud spend, reduced CI build time, and shaved reconciliation runtime so month-close validation lands hours earlier for every partner team.

    telemetry-driven RCA~78% faster CI builds~$35K/yr cloud cost removed
  4. →04

    SOX ownership, security & compliance

    Owner · SOX / Security

    I own four SOX controls end-to-end for the platform — compiling the annual audit-evidence packages, leading auditor and tester walkthroughs to minimal follow-ups, and authoring a reusable, AI-assisted evidence workflow that makes the process repeatable year over year. On the security side, I brought ~95 cloud resources into network-security-perimeter compliance across public and sovereign clouds and delivered managed-identity auth uplifts across every production region.

    4 SOX controls owned95 resources → compliant10 production regions

Stack

What I work with

Daily01
ScalaApache SparkC#/.NETAzureKusto / KQLSpark StreamingSQLPowerShell
Shipped to production02
DatabricksAzure Data FactoryHDInsightEvent HubsAzure Service BusDelta LakeCosmos DBAzure SQLRedisBicep / ARMEv2GraphQLTypeScriptReact
Hands-on03
JavaSpringNode.jsNestJSAngularGoogle CloudMongoDBElasticsearchPythonGoNext.jsAWS

Writing

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