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Lachlan Caldwell

Senior Software Engineer

Canberra · Canberra, ACT, Australia · lachlan.caldwell@data3.com.au

Senior .NET Engineer specialising in Azure serverless backends and enterprise integrations

DefenceFederal GovernmentRetail

About

Lachlan Caldwell is a Senior Software Engineer with 17 years of experience delivering robust .NET applications and Azure-based integration solutions. He has a strong background in designing scalable APIs, implementing CI/CD pipelines, and building secure backend systems for mission-critical environments. Lachlan has successfully delivered complex projects across Defence, Federal Government, and Retail sectors, with deep expertise in Azure Functions, Service Bus, and enterprise system integration.

Experience

  1. 2021-03 — Present
    Current
    Senior Software Engineer
    Data#3

    Leading backend development for cloud-native applications with focus on Azure serverless architecture and enterprise integrations.

    • Architected and delivered secure API platforms for federal government clients
    • Implemented event-driven processing solutions using Azure Service Bus
    • Mentored junior developers on .NET best practices and DevOps methodologies
  2. 2017-06 — 2021-02
    Software Developer
    Department of Defence

    Developed and maintained classified applications and integration services within secure environments.

    • Built internal workflow automation tools reducing processing time by 40%
    • Designed secure data exchange APIs compliant with Defence security standards
    • Led migration of legacy systems to modern .NET architecture
  3. 2013-01 — 2017-05
    Senior Consultant - Application Development
    Deloitte Australia

    Provided custom software development and integration services to government and private sector clients.

    • Delivered enterprise integration projects for major federal agencies
    • Specialised in Microsoft stack solutions including SharePoint and Dynamics
    • Conducted technical workshops and solution architecture reviews
  4. 2008-02 — 2012-12
    Software Engineer
    Woolworths Group

    Developed backend services and e-commerce platform components for Australia's largest retail group.

    • Implemented high-throughput order processing APIs
    • Built inventory integration services with third-party logistics providers
    • Contributed to major e-commerce platform modernisation initiative

Projects

  1. Evidence Management Portal
    2023-02 — 2024-06
    Australian Federal Police · Federal Government · as Senior Software Engineer

    Developed custom portal integrating SAP ERP with Microsoft 365 and internal evidence systems, resulting in 75% reduction in administrative overhead and full audit compliance.

    C#.NET FrameworkAzure FunctionsAzure StorageSAP IntegrationMicrosoft 365CI/CD
  2. Secure Document Exchange Platform
    2022-05 — 2023-11
    Department of Defence · Defence · as Senior Backend Developer

    Delivered a classified document exchange system that processes 15,000+ secure transactions per month with zero security incidents, reducing manual processing time by 65%.

    C#.NET 6Azure FunctionsAzure Service BusAzure ADSQL ServerAzure DevOps
  3. Citizen Services Integration Hub
    2021-08 — 2022-04
    Services Australia · Federal Government · as Lead Software Engineer

    Built central integration hub that connects multiple legacy systems to new digital channels, handling 2.3 million API calls monthly and improving service delivery speed by 50%.

    C#.NET CoreAzure FunctionsService BusMicrosoft Graph APIAPI ManagementAzure Key Vault
  4. Financial Reporting Automation Engine
    2020-01 — 2021-02
    Department of Finance · Federal Government · as Software Engineer

    Automated complex financial reporting processes across multiple agencies, reducing monthly reporting cycle from 12 days to 2 days and eliminating 90% of manual data entry errors.

    C#.NET 5Azure Service BusAzure FunctionsPower BISQL ServerAzure DevOps
  5. Omnichannel Customer Portal
    2019-03 — 2020-12
    Myer · Retail · as Backend Developer

    Designed and implemented backend services for customer loyalty and order management portal, increasing digital engagement by 35% and integrating real-time inventory from SAP.

    C#Azure FunctionsService BusSAP S/4HANAMicrosoft Power PlatformAzure API Management
  6. Supply Chain Integration Layer
    2010-06 — 2012-11
    Woolworths Group · Retail · as Software Developer

    Developed enterprise service bus layer connecting warehouse management systems with SAP and supplier portals, improving supply chain visibility and reducing stock discrepancies by 40%.

    C#.NET FrameworkWeb APISQL ServerSAPAzure Service Bus