Senior Full Stack .
NET and Web DeveloperExistco is seeking an experienced Senior Full Stack .
NET Developer to lead the next generation redesign and modernization of our ExPCS Existco Plant Control System (ExPCS), a comprehensive ERP and manufacturing platform used within the food manufacturing, processing, wholesale distribution, and logistics industries.We are looking for a highly capable senior developer and software architect who can help transform a mature, business-critical platform built on VB.NET, WinForms, Xamarin, SQL Server, and Windows Services into a modern API-driven architecture leveraging web, desktop, mobile, cloud, and distributed technologies.You will work directly with executive leadership, product owners, and customers to shape the long-term technical direction of the platform.Key ResponsibilitiesLead the technical architecture and modernization of the Existco Plant Control System platformDesign scalable backend services and API infrastructureBuild up-to-date desktop, web, and mobile applicationsRefactor legacy applications into service-oriented architectureDesign and implement domain-driven business objects and repositoriesImprove existing application performance, reliability, and maintainabilityDevelop integration frameworks for third-party platformsMentor junior developers and provide technical leadershipParticipate in strategic product planning and roadmap developmentCollaborate with business stakeholders to translate complex operational requirements into software solutionsMaintain and migrate existing platform until depreciation.Required Skills & Experience10+ years commercial software development experienceStrong C# and .




NET development expertiseExperience designing large-scale enterprise applicationsStrong SQL Server and database design knowledgeExperience with REST API developmentExperience with Azure cloud servicesStrong understanding of software architecture patternsExperience with object-oriented design principlesKnowledge of source control, CI/CD, and automated deploymentsUnderstanding of accounting principles, ERP Systems and Warehouse Management SystemsExcellent problem-solving and communication skillsHighly Desirable SkillsWhat Success Looks LikeWithin your first 12 months, you will help define and execute:The migration strategy from the legacy platformDesign of the new API and service layerModernization of desktop applicationsMobile application architecture roadmapScalable integration platform for customers and partnersImproved cloud deployment and monitoring capabilitiesWhy Join Existco?
Opportunity to architect a major business-critical platform from the ground upWork directly with executive leadership and product stakeholdersInfluence technology decisions and product directionExposure to cloud, desktop, web, mobile, and enterprise architectureLong-term product ownership and technical leadership opportunitiesCompetitive salary package based on experienceSalary Guide$100,000 - $120,000 + Superannuation(Dependent on experience, architecture capability, and demonstrated leadership)Qualification QuestionsHow many years of commercial software development experience do you have using .
NET technologies?
Less than 5 years5-10 years***** years15+ yearsHave you led the design, architecture, or modernization of a large-scale enterprise software platform?
YesNoIf yes,



please briefly describe the project.Which of the following technologies have you used professionally?
(Select all that apply)C#.
NET Framework / .
NET CoreSQL ServerAzureREST APIsWinFormsVB.NETMAUI / XamarinVue.jsElectronNode.jsTypeScriptWhat is your level of experience designing and implementing REST API architectures?
NoneBasicIntermediateAdvancedExpert / ArchitectHave you designed or implemented solutions using any of the following architectural patterns?
(Select all that apply)Domain-Driven Design (DDD)CQRSEvent-Driven ArchitectureMicroservicesRepository PatternNone of the aboveWhat experience do you have migrating legacy applications to modern architectures?
Please provide a brief example including technologies used and your role in the project.Which industries have you developed enterprise software for?
(Select all that apply)ManufacturingERPWholesale DistributionWarehousingLogistics / Supply ChainAccounting / FinanceRetailOtherHave you been responsible for mentoring developers or leading a software development team?
NoInformal MentoringTechnical LeadDevelopment ManagerSolution Architect / Principal EngineerPlease describe the largest software system you have designed, modernized, or maintained, including:Number of usersTechnology stackYour roleKey business functions supportedThis role requires working directly with executive leadership and helping define long-term product strategy.Which best describes your experience?
Developer onlySenior DeveloperTechnical LeadSolution ArchitectPrincipal Architect / CTO-level responsibilitiesBonus Question (Highly Recommended)Why are you interested in leading the modernization of the ExPCS platform, and what would be your high-level approach to transforming a legacy VB.NET/WinForms system into a modern API-first architecture?
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📌 Senior Full Stack .Net And Web Developer (Perth)
🏢 Existco
📍 Perth