joseph Mouhayar

I am a Senior Software Engineer and Application Developer specializing in designing, developing, and maintaining scalable business applications, SaaS platforms, APIs, dashboards, and AI-powered solutions.

I work across the full software development lifecycle, from understanding business requirements and designing the system architecture to developing, testing, deploying, and maintaining the final solution.

My technical expertise includes C#/.NET, ASP.NET Core, React, Next.js, JavaScript, Flutter/Dart, Python/FastAPI, SQL Server, PostgreSQL, Supabase, Firebase/Firestore, Azure, and Vercel. I also have experience with authentication systems, REST APIs, third-party integrations, cloud services, database architecture, Git, CI/CD, and AI/LLM integrations.

Services I can provide on a part-time or freelance basis

* Custom software development — Building complete web, mobile, and business applications from scratch. * SaaS development — Designing and developing scalable SaaS products, including architecture, authentication, databases, APIs, dashboards, and deployment. * Existing application development — Fixing bugs, adding features, improving performance, refactoring code, and reducing technical debt. * AI integration — Integrating AI/LLM capabilities into existing or new applications, including AI assistants, document processing, automated analysis, and intelligent business workflows. * Backend & API development — Building secure and scalable REST APIs, business logic, database systems, integrations, and backend services. * Database development — Designing databases, optimizing queries, creating migrations, improving data architecture, and working with SQL Server, PostgreSQL, Firebase, and Supabase. * Dashboard & business intelligence development — Building management dashboards, KPI systems, financial dashboards, inventory systems, reporting tools, and operational analytics. * Technical audits & code reviews — Reviewing existing applications to identify architectural problems, bugs, security risks, performance issues, technical debt, and opportunities for improvement. * Application modernization — Modernizing legacy applications, improving architecture, migrating technologies, and moving systems toward modern cloud-based solutions. * System integrations — Connecting different applications, databases, APIs, third-party services, AI services, and business systems. * Part-time technical leadership — Acting as a technical lead for startups or small businesses that need senior engineering guidance without hiring a full-time CTO or senior engineer.

I can work either on a specific project with a defined scope, provide ongoing part-time development and maintenance, or work as a part-time senior technical resource for a company that needs experienced engineering support.

My focus is not simply on writing code, but on understanding the business problem, designing the right solution, building it properly, and taking responsibility for the technical outcome.