Experienced Software Engineer | 8 Years in Development I am a dedicated Software Engineer with 7 years of hands-on experience in building robust applications across various platforms. Education: Bachelor’s degree in Computer Science and Informatics from the National Polytechnic University of Armenia. Proficient in both frontend and backend development, leveraging modern technologies to deliver high-quality software solutions. Strong expertise in database management with MySQL and SQLite, ensuring efficient data handling and storage. Technical Skills: Programming Languages: C, C++, Swift, Objective-C, Java Databases: MySQL, SQLite (with Core Data) Tools: Qt Creator, CMake, Git, GCC, VIM, JIRA, Jenkins, GitHub, Xcode, Docker Libraries/Frameworks: C++: STL, OpenCV, AWS, std::thread Swift: Foundation, UIKit I am passionate about delivering innovative software solutions and thrive in collaborative environments. Let’s work together to turn your ideas into reality!

As a seasoned innovator and software development expert from New York, with over 28 years of experience, I have a strong track record of success in creating innovative and high-quality products. My expertise lies in Windows-based software development using C++, as well as in medical software, medical billing codes, HIPAA compliance, artificial intelligence, internet of things, and low-level programming such as kernel drivers. I also have a deep understanding of cyber security, cyber intelligence, vulnerabilities assessment, security research, encryption, blockchain, and cryptography, and have developed several unique platforms in these areas. Throughout my career, I have taken projects from concept to completion, turning ideas into mature and successful products. In addition to my hands-on experience, I am also an author, having written a C++ bestseller and currently working on a new book for a major publisher. I am eager to take on exciting and challenging projects and put my skills and experience to work for you. If you are in need of a skilled and innovative software developer, I would be happy to discuss your project further. I am a BBB Accredited business and a Microsoft Supplier, among my clients: Sony, IBM, OpenAI, Pixm Security, Deep Code, Security Snares and more. I have experience in medical applications, review and assign correct CPT codes to medical procedures, comply with Epic and Cerner requirements and use AI for such applications. I am a member of HTCIA.

If you're building a SaaS platform, modernizing a legacy .NET system, or need an experienced architect who can design multi-tenant applications that are secure, scalable, and maintainable you're in the right place. I'm Mayur, a Microsoft Certified .NET Full Stack Developer with 12+ years of experience building enterprise-grade web applications. I specialize in ASP. NET Core, C#, SQL Server, Azure, and AWS with deep expertise in multi-tenant SaaS architecture, microservices, and complex authentication systems using AWS Cognito, Lambda Authorizers, Identity Server 4, and JWT-based RBAC. What I specialize in: 1. Multi-Tenant SaaS Development -- Built from-scratch multi-tenant platforms with per-tenant configurations, Temporal-based workflow orchestration, and real-time data sync across locations. 2. Authentication and Authorization -- AWS Cognito, Lambda Authorizers, Identity Server 4, OAuth2, JWT. Designed auth layers for applications serving thousands of concurrent users across different roles and tenants. 3. Workflow Automation -- Temporal based durable workflows, Hangfire background jobs, AWS SNS/SQS event pipelines. If your business has manual processes that belong in code, that's where I come in. 4. API Development and Integrations -- RESTful APIs, third-party integrations (Stripe, HubSpot, Gmail, Twilio, OpenDental, NexHealth), and cloud-native backends on Azure and AWS. 5. Legacy Modernization -- Upgrading older ASP. NET / .NET Framework systems to maintainable, modern .NET Core solutions without disrupting ongoing operations. Industries I've worked in: Healthcare / Dental PMS -- GovTech / Advocacy -- FinTech / Real-Time Trading -- Real Estate CRM -- EdTech / LMS -- Pharma / Patient Tracking -- E-commerce / Review Platforms ==> Technologies I work with: Backend: ASP .NET Core, C#, .NET 8, Web API, Entity Framework, Blazor Database: SQL Server, PostgreSQL, Oracle, Stored Procedures Cloud: Azure (App Services, Service Bus, Application Insights, Functions), AWS (Cognito, Lambda, API Gateway, SNS, SQS, ECS) Security: JWT, OAuth2, RBAC, Lambda Authorizers, Identity Server 4, AWS Cognito Messaging and Jobs: Temporal, Hangfire, Azure Service Bus, AWS SNS/SQS Frontend: Angular, JavaScript, jQuery, Blazor Tools: Git, Swagger, Postman, Docker, Visual StudioWhy clients work with me: ==> Clear communication and organised execution. I work well in structured environments -- Slack standups, sprint planning, Jira or Asana, GitHub PR reviews. Strong backend and architecture thinking. I don't just write code I design systems that hold up as the business scales. Reliable delivery with business context in mind. I understand that behind every technical requirement is a business goal, and I keep that in sight. Practical problem-solving. I can understand your business process, design the right solution, and deliver a maintainable system. AI-augmented development. I use AI tools to accelerate scaffolding, test case generation, and documentation but all outputs are manually reviewed, tested, and refined before delivery. Send me a message with your project goals, your current system challenges, or the workflow you're looking to improve. I'm here to help.

I work at the intersection of full-stack engineering, AI automation, and cloud engineering, using PHP, C++, Python, and CRM technologies to build scalable solutions that drive business growth. At Pearl Health, I worked as a technical lead engineer with a business advisory role, primarily on legacy and enterprise healthcare systems. I led modernization efforts across WordPress and HubSpot CMS platforms, PHP-based development, API integrations, and performance improvements, while also supporting value-based care partnerships by helping teams align technical capabilities with ACO REACH programs, PCP independence, and post-acute care network integration. I also design software architectures, develop algorithms for complex business workflows, and build AI-powered solutions using LLMs, RAG, and agent-based systems. From architecture diagrams and technical documentation to business process automation, I translate ideas into scalable, production-ready systems. Technology is at its best when it empowers people and solves problems that matter. I enjoy building systems with clarity, purpose, and longevity alongside teams that value craftsmanship and long-term thinking.

I help startups, SMEs, and enterprise clients design, build, and scale complex business platforms — from fintech and payments to inventory, invoicing, memberships, and AI-powered automation. With 18+ years of experience in mission-critical systems (Payments, Fintech, POS, remittance, IoT, AI), I lead agile teams to deliver robust, scalable, and secure solutions across cloud and on-premise environments. Core Solutions I Deliver: Payments & Remittance Systems End-to-end payment gateways (APIs, processors, PCI-DSS infra) Mobile-first remittance apps (KYC/AML, Pay-in / Payout / FX, Admin, Compliance) White-labeled payment gateway platforms for ISOs, fintechs, and merchants Inventory Management Platforms Multi-channel inventory sync (web, mobile, POS) Distributor ↔ Retailer integrations Predictive reordering, shelf optimization, low-stock alerts Invoicing & Billing Systems Recurring billing, membership management, revenue recognition Integration with QuickBooks, Sage, and ERPs Payment, refund, chargeback workflows AI-Powered Automation Generative AI platforms (content generation, document automation) Workflow automation to cut costs and increase speed-to-market IoT Cloud Solutions Remote firmware update platforms (OTA, rollback strategies) Device management, campaign control, analytics dashboards Membership & Subscription Platforms Subscription billing, renewals, discount engines, dashboards Secure payment flows, reporting, analytics How I Work: End-to-End Delivery (Architecture, Development, QA, DevOps) Scalable, Compliant, Secure Systems Collaborative & Transparent Project Management Recent Success Stories: RetailTech SaaS: Scaled live inventory platform integrated with POS & predictive AI Remittance App: Full ecosystem from KYC to payouts, FX, and compliance AI SaaS: Automated publication platform for medical/scientific professionals White-Labeled Payment Gateway: Delivered PCI-DSS-compliant multi-tenant platform for global merchants If you’re looking for a partner to help you deliver robust business platforms faster and with confidence — let’s connect.

I build multiplayer games and interactive 3D applications in Unity and Unreal Engine. 10+ years in software, $100K+ earned on Upwork across 52 contracts, Top Rated Plus. Games I have worked on: • Pixelmon Arena, a team based multiplayer fighting game with custom networking for real time 2v2 to 4v4 matches, ranking, and character customization, in my portfolio below • TCG World, an open world multiplayer game on Steam with wallet login and persistent leaderboards • Warriors of Nova Thera and Glyph Bound: Kotodama, open world and tactical PvP RPG projects with combat, progression, and guild systems • Scamper, a PCVR title shipped on Steam and Meta Quest • Mobile and browser games across puzzle, board, and casual genres, several shipped for repeat clients you can see in my work history Multiplayer is my core strength, Photon, Mirror, and Netcode, lobbies, matchmaking, state sync, and the low latency player feedback that decides whether an online game feels good or laggy. Beyond games I have built VR training and simulation applications, so headset work is familiar ground too. I have also worked as a Product Owner and certified Scrum Master, so on larger projects I can run the process, not just write the code, sprint planning, backlog, and clear communication with stakeholders. Stack: Unity, Unreal Engine, C#, Photon, Mirror, Netcode, WebGL, Meta Quest, AR Foundation, Firebase, PlayFab, REST APIs. If you are building a multiplayer game, a game prototype, or need a senior developer to take over an existing Unity or Unreal codebase, tell me what you are building and I will show you the closest thing I have shipped.

Many companies don't need another developer—they need someone who can understand a complex system, identify technical risks, and build the right solution before writing thousands of lines of code. That's where I help. I'm a Software Architect and Senior .NET Engineer with 20+ years of commercial experience designing, modernizing, and scaling business-critical applications. I specialize in turning complex legacy systems into maintainable, scalable platforms while minimizing business disruption. Over the years, I've worked with startups, SMBs, and enterprise clients, helping them solve technical challenges rather than simply implementing features. What I can help you with ✔ Legacy system modernization ✔ Technical Discovery & Solution Architecture ✔ SaaS platform development ✔ ASP.NET Core / .NET 6-10 ✔ Azure Cloud Architecture ✔ System Design & Technical Leadership ✔ Performance optimization ✔ Multi-tenant applications ✔ REST APIs & Microservices ✔ Database design & optimization (SQL Server) ✔ Identity, Authentication & Authorization ✔ AI integration into existing applications Typical projects • Modernizing large legacy .NET applications • Building new SaaS products from scratch • Designing scalable cloud architectures • Technical due diligence before development starts • Recovering undocumented business logic • Refactoring complex systems • Leading development teams • Solving performance bottlenecks My technology stack • C# • .NET / ASP.NET Core • Azure • SQL Server • Entity Framework Core • Angular • React • Docker • Kubernetes (AKS) • Redis • RabbitMQ • SignalR • OpenIddict • Azure DevOps • GitHub Actions How I work I believe software development starts with understanding the business—not the technology. Before suggesting an implementation, I focus on understanding business goals, existing workflows, technical debt, and future scalability. This approach significantly reduces project risk and helps avoid expensive architectural mistakes. I'm comfortable working as: • Software Architect • Senior Full Stack .NET Developer • Technical Lead • Fractional CTO • Technical Consultant If you're looking for someone who can not only write high-quality code but also help make the right technical decisions, I'd be happy to discuss your project.

I’m a Senior Unity Developer with 8+ years of experience in Unity Game Development, building 2D/3D games, multiplayer systems, AR/VR applications, and AI-powered interactive experiences for mobile, PC, and WebGL platforms. I help startups, studios, and businesses turn ideas into scalable, high-performance Unity products using clean C# architecture, optimized gameplay systems, and reliable development pipelines. My focus is delivering production-ready solutions with strong performance and maintainable code. Core Expertise 🎮 Unity 2D/3D Game Development (Mobile, PC, WebGL) 🕹 Multiplayer Systems – Photon, Mirror, Netcode 🥽 AR/VR Development – Oculus, Vuforia, XR Toolkit 💻 Advanced C# Programming & System Architecture ⚡ Unity Performance Optimization (Mobile & Desktop) 🔗 Backend Integration – PlayFab, Firebase, REST APIs 🤖 AI Integration & Automation Workflows Why Clients Choose Me ✔ Top Rated Developer with 100% Job Success ✔ 8+ years of professional Unity development experience ✔ Expert in multiplayer, XR, and scalable game systems ✔ Clean, optimized, and production-ready code If you're looking for a reliable Unity Developer for games, multiplayer systems, or XR applications, let’s discuss how I can help bring your project to life.

✅ 𝗠𝘂𝗹𝘁𝗶𝗽𝗹𝗲 𝟳-𝟴 𝗳𝗶𝗴𝘂𝗿𝗲 𝘀𝘂𝗰𝗰𝗲𝘀𝘀𝗲𝘀 & 𝗦𝗮𝗮𝗦 𝗰𝗹𝗶𝗲𝗻𝘁𝘀/𝗮𝗽𝗽𝘀 𝗮𝗰𝗾𝘂𝗶𝗿𝗲𝗱. ✅ 𝟳𝟱+ 𝗮𝗽𝗽𝘀 𝗯𝘂𝗶𝗹𝘁. 𝟭𝟭+ 𝘆𝗲𝗮𝗿𝘀 𝗽𝗿𝗼𝗳𝗲𝘀𝘀𝗶𝗼𝗻𝗮𝗹 𝗲𝘅𝗽𝗲𝗿𝗶𝗲𝗻𝗰𝗲. ✅ 𝗔𝗰𝗰𝘂𝗿𝗮𝘁𝗲 & 𝗴𝘂𝗮𝗿𝗮𝗻𝘁𝗲𝗲𝗱 𝗾𝘂𝗼𝘁𝗲𝘀 𝘄𝗶𝘁𝗵 𝟯𝟬-𝟰𝟬% 𝗹𝗼𝘄𝗲𝗿 𝗰𝗼𝘀𝘁𝘀 𝗮𝗻𝗱 𝗱𝗲𝘃 𝘁𝗶𝗺𝗲𝘀 𝘁𝗵𝗿𝗼𝘂𝗴𝗵 𝗽𝗿𝗼𝗽𝗿𝗶𝗲𝘁𝗮𝗿𝘆 𝗳𝗿𝗮𝗺𝗲𝘄𝗼𝗿𝗸 𝘂𝘀𝗲(prebuilt-SaaS code). ✅ 𝗣𝗵𝗲𝗻𝗼𝗺𝗲𝗻𝗮𝗹 𝗰𝗼𝗺𝗺𝘂𝗻𝗶𝗰𝗮𝘁𝗶𝗼𝗻 𝗮𝗻𝗱 𝗽𝗿𝗼𝗷𝗲𝗰𝘁 𝗺𝗮𝗻𝗮𝗴𝗲𝗺𝗲𝗻𝘁 𝘀𝗸𝗶𝗹𝗹𝘀. 𝗜𝗻𝘁𝗲𝗹𝗹𝗶𝗴𝗲𝗻𝘁 𝗱𝗲𝘃 𝗽𝗿𝗼𝗰𝗲𝘀𝘀 𝗳𝗼𝗹𝗹𝗼𝘄𝗲𝗱 𝗯𝘂𝗶𝗹𝘁 𝘁𝗵𝗿𝗼𝘂𝗴𝗵 𝗼𝘁𝗵𝗲𝗿 𝗽𝗿𝗼𝗱𝘂𝗰𝘁 𝘀𝘂𝗰𝗰𝗲𝘀𝘀𝗲𝘀. ✅ 𝗦𝗰𝗮𝗹𝗮𝗯𝗹𝗲 𝘀𝗼𝗹𝘂𝘁𝗶𝗼𝗻𝘀, 𝗲𝗻𝘁𝗲𝗿𝗽𝗿𝗶𝘀𝗲-𝗿𝗲𝗮𝗱𝘆 𝗳𝗿𝗼𝗺 𝗹𝗮𝘂𝗻𝗰𝗵. ✅ 𝗨𝗦 𝗰𝗹𝗶𝗲𝗻𝘁 𝘀𝗽𝗲𝗰𝗶𝗮𝗹𝘁𝘆. Hi, I’m Andrew! I specialize in delivering polished SaaS apps consistently focused on earning revenue. 𝗜𝗻𝘃𝗶𝘁𝗲 𝗺𝗲 𝘁𝗼 𝘆𝗼𝘂𝗿 𝗽𝗿𝗼𝗷𝗲𝗰𝘁 𝗼𝗻 𝗨𝗽𝘄𝗼𝗿𝗸 𝗼𝗿 𝘀𝗲𝗻𝗱 𝗺𝗲 𝗮 𝗱𝗶𝗿𝗲𝗰𝘁 𝗺𝗲𝘀𝘀𝗮𝗴𝗲 𝗮𝗻𝗱 𝗶𝗳 𝘁𝗵𝗲𝗿𝗲’𝘀 𝗮 𝗹𝗶𝗸𝗲𝗹𝗶𝗵𝗼𝗼𝗱 𝗼𝗳 𝗮 𝗴𝗼𝗼𝗱 𝗳𝗶𝘁 𝘁𝗼 𝘄𝗼𝗿𝗸 𝘁𝗼𝗴𝗲𝘁𝗵𝗲𝗿, 𝗜’𝗹𝗹 𝗶𝗻𝘃𝗶𝘁𝗲 𝘆𝗼𝘂 𝘁𝗼 𝗯𝗼𝗼𝗸 𝗮 𝗰𝗼𝗺𝗽𝗹𝗶𝗺𝗲𝗻𝘁𝗮𝗿𝘆 𝗰𝗼𝗻𝘀𝘂𝗹𝘁𝗮𝘁𝗶𝗼𝗻 𝗰𝗮𝗹𝗹 𝘁𝗼𝗴𝗲𝘁𝗵𝗲𝗿. 🗣 𝗝𝗼𝗵𝗻 𝗠𝘂𝗹𝗹𝗲𝗻𝗵𝗼𝗹𝘇 - 𝗛𝗲𝗮𝗱 𝗼𝗳 𝗦𝗮𝗹𝗲𝘀, 𝗦𝘁𝗿𝗮𝘁𝗲𝗴𝗶𝗰 𝗘𝗻𝘁𝗲𝗿𝗽𝗿𝗶𝘀𝗲 - 𝗨𝗯𝗲𝗿 𝗘𝗮𝘁𝘀 ❝ Andrew is the most skilled freelancer and developer I have ever worked with, and I have worked with a lot. He was able to take very broad ideas and turn them into actionable insights and plans in a way I could never imagine was possible. Andrew is the best possible thing to happen to our business and the definition of a true professional. I could not recommend him enough. Anyone who has the opportunity to work with Andrew should consider themselves extremely lucky. ❞ I excel at expertly guiding the app dev process to max out your revenue-earning potential in contrast to your costs, and to steer you away from common SaaS app pitfalls. Client Outcome Examples: ⚡ amzalert.com (8-Figure Acquisition - Rebuilt In 4 Months) ⚡ launchcontrol.us (8-Figure Annual Recurring Revenue - ARR) ⚡ GuestBan.com (Concept-To-Live in 5 Months - 1M+ Monthly App Checkins) My support is based on hard-won successes built through more than a decade of SaaS app obsession. Most of my clients are: ☑️ Existing Businesses - Post-revenue ☑️ Solopreneurs & Small Teams - Wanting to build an MVP app ☑️ Funded Startups - Focused on turning funding into MRR ☑️ Existing Early Stage SaaS - Want to rebuild and scale up I’m the founder of a small, hand-picked team of talented humans. I’m personally involved in all projects, and we only employ senior developers and native English speakers from the US for project management and communication. My team and I are able to consistently reduce dev costs by about 30-40% by leveraging pre-built development frameworks for common app experiences like the user login or checkout, for example, while reserving valuable dev hours for truly custom functionality. Every project we build delivers: 📱Cross Device Compatibility - Desktop - Mobile - Tablet 📈 App Speed Optimization 🧩 Scaleable - Cost-Effective Feature Addition Potential 🛡️ Security 📊 User Analytics & Internal Dashboards 🌐 Multi-Language Localization 🤖 Quality Assurance - QA 📜 Paid User Subscription, Billing & Renewal Management Thanks for taking the time to learn more about me. Invite me to your project or send me a direct message if you’re interested in working together. Talk soon! Andrew Mace - Founder - Lean Engineering Highlights of the work I have extensive experience in includes: SaaS MVP • AI Automation • No-Code/Low-Code • Process Automation • RPA • .NET 8 • Python • AWS • Azure • Docker • Serverless • OpenAI / ChatGPT • Generative AI • Zapier • Make.com • UiPath • Power Automate • n8n • Bubble • Airtable • Stripe • PayPal • Twilio • Slack • Teams • REST APIs • Webhooks • SQL • PostgreSQL • Redis • Power BI • KPI Dashboards • ETL • Airflow • Real-Time Chat • Push Notifications • Subscription Billing • CRM Integration • Lead Generation Bots • Data Analytics • Digital Transformation • Workflow Automation • Rapid Prototyping

Senior .NET Engineer with 11+ years of experience building FinTech platforms, payment systems, marketplace applications, and business automation solutions. My expertise spans the full software lifecycle—from architecture and backend development to cloud infrastructure and deployment. I specialize in C#, .NET, ASP.NET Core, Azure, SQL Server, Docker, React, distributed systems, and modern software architecture patterns. Over the years, I have built and maintained high-traffic platforms, payment gateways, wallet systems, trading and marketplace solutions, API integrations, and business process automation systems. I have extensive experience with microservices, CQRS, event-driven architectures, background processing, cloud-native applications, and performance optimization. I focus on building systems that are reliable, maintainable, and ready for long-term growth—not just delivering code that works today. Whether you need a new platform built from scratch, an existing system modernized, complex backend development, cloud architecture, or technical leadership for your project, I can help turn your requirements into a production-ready solution. Let's build something exceptional.