Software Engineer Senior

Carlton Johnson

Sr. Software Engineer .NET, Angular, React, Azure, AWS, Finance, Healthcare

Holiday, FL 737-***-**** ***************@*****.*** linkedin.com/in/carlton-johnson-45490b1b0 Accomplished Senior Software Engineer with over 13 years of experience driving digital transformations in Finance (8 Yrs) and Healthcare

(5.3 Yrs) industries, modernizing systems to support large-scale operations and enhance efficiency for thousands of users. Proficient in C#/.NET with Angular (5 Yrs), and skilled in leveraging cloud platforms like Azure (3 Yrs) and AWS (2 Yrs) for scalable solutions. SKILLS

C#, TypeScript, JavaScript, SQL (T-SQL), Python, C++, Java, VB.NET, Node.js

ASP.NET, ASP.NET Core, ASP.NET MVC, Laravel, Node.js, Entity Framework/Core, ADO.NET, RESTful API, gRPC, Soap, SignalR, WebSockets

React, Angular, Next.js, Redux, RxJS, NgRx, jQuery, Kendo UI, Angular Material, MaterialUI, Bootstrap, HTML, CSS, Razor, React Native

MS SQL Server, SSMS, SSIS, SSRS, PostgreSQL, MongoDB, Cosmos DB, Redis, Azure Data Explorer

Azure (AKS, Service Bus, Functions, Blob Triggers, API Management, AD B2C, Key Vault, App Insights, Data Explorer, DevOps), AWS

(Lambda, Cognito, SQS, CodePipeline, CodeBuild, SageMaker, API Gateway)

Docker, Kubernetes, Terraform, ARM Templates, Jenkins, TeamCity, Git, TFS

Datadog, Serilog, Azure App Insights, Application Insights, Power BI, SSRS, SonarCloud, JMeter, Jasmine, Karma, xUnit, NUnit, Moq WORK EXPERIENCE

SCIENCESOFT REMOTE

Senior Software Engineer ASP.NET Core, Angular/Blazor, Azure 05/2022 – 06/2025 Led design of "BillForge Matrix" (InvoiceGate System) in Azure microservices using ASP.NET Core 8, Entity Framework Core, Docker, AKS, and Azure Service Bus, reducing processing times by 20% for 100k+ transactions

Modernized portals with C#, ASP.NET Core 8, and Angular 15 using RxJS, NgRx, and Angular Material, streamlining B2B onboarding, boosting engagement for 50k+ users via dashboards

Refactored legacy ASP.NET MVC with Kendo UI, jQuery, adding SignalR for real-time payment updates, and implemented EDI X12

(810/820) backend pipeline for standards compliance

Optimized invoice posting and payment matching through T-SQL queries, indexing, partitioning in MS SQL Server, and integrated Cosmos DB (MongoDB API) to handle semi-structured data - processing 1M+ daily records and improving efficiency in revenue cycle

Designed ETL pipelines with SSIS, Azure Functions with Blob Triggers for "TaxAlign Grid", unifying data via SSRS reports, reducing ingestion errors by 15% across disparate sources

Modernized integrations from SOAP to REST with Azure API Management (security, quotas, versioning) cutting partner onboarding weeks to days and built internal gRPC services plus a Dynamics 365 (Dataverse) OData pipeline powering Power BI dashboards

Deployed AI-driven reminders using Python, Azure Functions, and Azure OpenAI Service in "PayNudge Framework", with Redis caching, slashing DSO by 20%, boosting collections by 15%

Implemented monitoring for failed postings and mismatches via Azure Functions, Application Insights, and Serilog in "VigilTrace System", achieving 99.9% SLA uptime through proactive incident detection and resolution

Enhanced security with RBAC, Azure AD B2C for SSO, OAuth2/JWT authentication, Key Vault for secrets, WAF and IP allow listing, fraud/anomaly detection rules, and federation with PingFederate - reducing unauthorized access by 40% and ensuring compliance in partner portals and billing systems

Established comprehensive testing strategies with xUnit, Moq for mocking, Jasmine/Karma for frontend, and JMeter for performance in TDD practices - achieving 80%+ code coverage and integrating SonarCloud for quality analysis

Automated CI/CD pipelines using Azure DevOps (migrating legacy Jenkins jobs) for builds and Terraform for infrastructure as code (IaC) while phasing out ARM templates - cutting deployment times by 25% and build times by 20%

Conducted weekly code reviews and mentored 2 junior developers in a 6-member team, implementing lightweight PI-style planning and Lean-Agile principles - fostering collaboration, increasing team velocity, and improving delivery quality in

.NET/Azure projects

TAPCHECK INC REMOTE

Senior Software Engineer .NET, React, Angular, AWS 03/2020 – 05/2022 Led migration of legacy VB.NET, Web Forms desktop apps to .NET Core 5, Angular, and AWS microservices - modernizing payroll and wage access solutions, integrating 3rd-party payroll/banking providers, reducing processing times by 30%, and scaling for 50k+ users

Created RESTful Web APIs for Digital Payments Portal, Payroll Insights Extension, and Financial Operations Suite using C#, Entity Framework Core, and MS SQL Server - automating calculations, disbursements, and compliance reporting, boosting accuracy by 25% and cutting errors in wage access

Developed serverless caching using AWS Lambda and Redis, along with micro-batching for MongoDB/PostgreSQL - accelerating payroll data queries, handling peak volumes, and improving system responsiveness for real-time wage disbursement and operations

Introduced security standards like SAML, OAuth, and JWT via AWS API Gateway and Amazon Cognito - protecting sensitive payroll/banking data, ensuring SOC 2/GDPR/PCI DSS compliance

Upgraded Apache Kafka infrastructure for reliable real-time processing of payroll transactions and notifications - leveraging multithreading for parallel task execution, ensuring timely wage payments during peak periods, and minimizing delays

Utilized Docker for containerized deployment of financial apps, adhering to enterprise security/compliance, and automated CI/CD pipelines with AWS CodePipeline/CodeBuild - enabling faster releases, and reducing manual effort for payroll features

Collaborated in SCRUM teams to define requirements and design payroll advance/payment components - integrating AI for intelligent automation via Python and AWS SageMaker, and increasing processing efficiency by 15% for 10k+ daily users

Architected mobile banking features for wage access apps using C#, Node.js backend, React frontend, and React Native for Android/iOS on AWS - serving 10k+ users, optimizing performance with code splitting/lazy loading

Optimized internal portals with ASP.NET MVC, Kendo UI, Bootstrap, jQuery, and Angular - rewriting legacy code, troubleshooting LINQ/T-SQL, and integrating SSRS/Power BI reports with D3.js dashboards, reducing query times by 30% for payroll insights

Migrated SOAP-based services to RESTful APIs for payment processing, account management, and KYC verification - implementing OAuth2/JWT on AWS, enhancing reliability in real-time wage disbursement systems

Established Datadog monitoring for KPIs like transaction latency, error rates, and resource utilization - identifying and resolving top crash causes, achieving 95%+ uptime, and contributing to an 8% revenue increase through optimized wage access features HALLMARK HEALTH CARE SOLUTIONS ONSITE

Software Engineer .NET, React, Next.js, Agile 03/2012 – 03/2020 Led the migration of a legacy VB.NET patient portal to a React/Next.js, .NET Core 2.2, and MaterialUI stack, ensuring robust HL7 and FHIR interoperability for secure clinical data exchange, and embedding HIPAA-compliant authentication and audit trails to safeguard Protected Health Information (PHI). This transformation enabled seamless integration with Electronic Health Record (EHR) systems and third-party providers, reducing manual data entry and minimizing clinical errors

Developed modern ASP.NET MVC web applications to streamline patient and provider workflows, resulting in a 20% boost in user engagement and performance, directly supporting improved patient outcomes and operational efficiency for healthcare organizations

Engineered high-performance SQL Server solutions by designing optimized Stored Procedures, Views, Triggers, and complex T-SQL queries, reducing query execution time by 40% and supporting the real-time data needs of healthcare administrators and clinicians

Streamlined data access using Entity Framework and LINQ within ASP.NET, achieving a 30% reduction in application load times and improving the responsiveness of mission-critical healthcare applications, which is essential for timely clinical decision-making

Implemented RESTful APIs with ASP.NET Web API to enable secure, standards-based integration between front-end applications, EHRs, and third-party healthcare services, facilitating interoperability and supporting value-based care initiatives

Ensured reliability and regulatory compliance through comprehensive unit and integration testing with NUnit and xUnit, reducing production defects and supporting HIPAA and FDA validation requirements for healthcare software

Designed responsive user interfaces with Razor Pages, guaranteeing a consistent, accessible experience for clinicians and patients across desktop and mobile devices, in line with healthcare accessibility and usability best practices

Accelerated project delivery by 30% by championing Agile SCRUM and Test-Driven Development (TDD), enabling the team to rapidly adapt to evolving healthcare regulations and client requirements while ensuring continuous compliance and high code quality - critical in the fast-changing healthcare IT landscape EDUCATION

Vanderbilt University, Nashville, TN

Bachelor of Science, Computer Science

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