.NET 5+ API Development Expert

@irsolutions

I understand the critical need for a seasoned .NET 5+ API Development Expert to spearhead your SaaS platform's micro-service architecture. Having managed high-performance solutions for over a decade, including scaling systems for 1M+ users, I am well-equipped to tackle the challenges your project presents. My strategic insight involves implementing robust RESTful and gRPC APIs to seamlessly integrate internal and external services, optimizing database design for efficient data operations, and ensuring all code is well-documented and tested for reliability. With a proven track record in delivering secure and scalable solutions, I am confident in my ability to drive success for your project. I invite you to reach out to discuss how we can collaborate effectively in achieving your project goals. Let's connect to outline a roadmap that aligns with your vision for the API layer of your SaaS platform.

@augurstech

A Warm Hello! We are readily available to start working on this project! I have read your job posting and glad to mention that we specializes in enterprise-grade .NET backend engineering and distributed microservice architectures, with extensive experience building high-performance APIs for SaaS platforms running on Azure. Your stack and workflow align closely with the environments we support daily — including .NET 6/7, EF Core, Docker, Azure SQL, Swagger/OpenAPI, Azure DevOps, Jira, and Microsoft Teams collaboration. Here’s how we can contribute immediately: • Design and develop secure, scalable RESTful and gRPC APIs for both internal microservices and external partner integrations • Refactor and optimize existing endpoints to improve latency, throughput, and long-term maintainability • Handle database architecture, migrations, indexing, and query optimization across SQL Server/PostgreSQL environments • Implement robust unit and integration testing to ensure reliable CI/CD pipeline execution • Deliver production-ready documentation, migration scripts, deployment instructions, and updated ERDs We’d be happy to discuss the first milestone and review the current architecture in more detail. Looking forward to collaborating with you. Best regards, Ana

@topcreator100

Hi there, I’m excited about owning your API layer and delivering fast, reliable REST and gRPC endpoints in a .NET 5+ microservice setup. I have deep experience with .NET 5/6+, EF Core, Docker, Azure, and database work for SQL Server and PostgreSQL, so I can tackle API, DB migrations, and CI/CD with confidence. I’ll audit existing endpoints, refactor hot paths, and add tests to ensure performance, reliability, and security, while keeping docs and ERD up to date. I’m ready to join daily standups, deliver the first milestone to staging within a sprint, and include a deployment guide and migration scripts for Azure DevOps; please share your top priorities to align the plan

@Mahihassi

As a seasoned professional with extensive experience in API development and backend systems, I am confident that I am the perfect fit for your .NET 5+ API Development project. Throughout my career, I have consistently delivered clean and well-documented code that adds value to my clients' businesses. Working extensively with the .NET runtime (including the latest versions), Entity Framework Core, and Azure SQL, I am accustomed to handling large-scale, micro-service architectures and ensuring fast and secure data operations. Moreover, having used tools like Swagger/OpenAPI and Docker in tandem with .NET, I can guarantee an efficient integration process with your existing setup. I understand the importance of collaboration in achieving a successful project outcome. Daily stand-ups via Teams and task management through Jira align perfectly with my workflow. Additionally, my proficiency in designing backend ecosystems and building RESTful APIs will enable me to fulfill your deliverables seamlessly. Let's get started on maximizing your platform's performance and reliability!

@designysoft

Hello, With 20+ years of experience in enterprise software development and backend architecture, I am confident I can take ownership of your API layer and contribute immediately. I have deep hands-on expertise with .NET 5/6/7+, microservices, RESTful APIs, gRPC, EF Core, SQL Server/PostgreSQL, Docker, and Azure-based deployments. I have built and maintained high-performance SaaS backends, focusing on clean architecture, scalability, performance optimization, and secure integrations with internal systems and third-party APIs. I am comfortable owning API development, refactoring, database design, migrations, query optimization, and CI/CD workflows in Azure DevOps. I also follow disciplined engineering practices with unit/integration testing, Swagger documentation, Git workflows, and deployment readiness. You can expect clean, maintainable code, strong communication in stand-ups, and reliable delivery aligned with staging and performance goals. Ready to start immediately and discuss the first milestone. Thanks.

@kamran2012

Hey, I will build and refine your RESTful and gRPC endpoints — handling EF Core migrations, query optimization on Azure SQL, and full test coverage wired into your Azure DevOps pipeline. One thing I will prioritize early: adding response compression and async streaming for gRPC calls, which keeps latency low under load without overcomplicating the service layer. Questions: 1) Are you using a shared API gateway, or does each microservice expose its own endpoints? 2) Which database — Azure SQL or PostgreSQL — is primary right now? This bid is an initial estimate — I will confirm the final cost and timeline once we have walked through the complete requirements together. Send me a message and we can go over the details. Best regards, Kamran

@ZohaibRoy

⭐⭐⭐⭐⭐ Senior Engineer for API Layer Development in .NET Environment ❇️ Hi My Friend, I hope you are doing well. I've reviewed your project requirements and see you are looking for a senior-level engineer to own the API layer. You don’t need to look any further; Zohaib is here to help you! My team has successfully completed 50+ similar projects in API development. I will focus on creating efficient RESTful and gRPC APIs, refactoring existing endpoints for better performance, and managing database design and optimization. ➡️ Why Me? I can easily handle your API development needs as I have 5 years of experience in .NET development, specializing in API creation, database management, and performance optimization. My expertise includes RESTful services, SQL Server, and Azure DevOps. I also have a strong grip on other technologies like Docker and Entity Framework, ensuring a smooth and efficient workflow for your project. ➡️ Let's have a quick chat to discuss your project in detail. I would love to show you samples of my previous work. Looking forward to chatting with you! ➡️ Skills & Experience: ✅ .NET 5/6/7 ✅ API Development ✅ RESTful Services ✅ gRPC Integration ✅ Database Design ✅ SQL Server ✅ PostgreSQL ✅ Entity Framework Core ✅ Swagger/OpenAPI ✅ Unit Testing ✅ CI/CD ✅ Docker Waiting for your response! Best Regards, Zohaib

@abdulhamidh2

Hello I just reviewed your need for a senior engineer to lead the API layer on your .NET 5+ microservices platform, and it aligns perfectly with my experience. I specialize in building and optimizing RESTful and gRPC APIs using .NET 6/7 and Entity Framework Core, ensuring clean, maintainable code with full test coverage. For your project, I’ll focus on refactoring existing endpoints for better performance, designing efficient database schemas with migrations for Azure SQL and PostgreSQL, and delivering clear deployment guides. I’m also well-versed in Docker containerization and Azure DevOps pipelines to streamline CI/CD workflows. Let’s discuss how I can help you hit your milestones quickly while maintaining high-quality standards. Best regards, AbdulHamid

@Feriver

Hello, I understand you’re looking for a senior .NET 5+ engineer to take ownership of your SaaS API layer within a microservice architecture, focusing on building and maintaining high-performance REST and gRPC APIs, refactoring existing endpoints, and ensuring robust database design and optimization across SQL Server/PostgreSQL environments. I will develop clean, scalable API services using .NET 6/7 with proper layering, dependency injection, and SOLID principles, ensuring all endpoints are well-documented with Swagger/OpenAPI. I will also implement or enhance unit and integration tests to guarantee full pipeline compatibility, optimize performance bottlenecks in existing services, and manage database migrations with EF Core while maintaining clean schema evolution and rollback safety. All deliverables will include production-ready code committed to your Git repository, full test coverage aligned with Azure DevOps CI/CD pipelines, structured migration scripts with updated ERDs, and clear deployment documentation covering environment configuration and release procedures. I can integrate seamlessly into your Jira/Teams workflow and start immediately with the first milestone. Thanks, Asif

@tangramua

Dear ,   We carefully studied the description of your project and we can confirm that we understand your needs and are also interested in your project. Our team has the necessary resources to start your project as soon as possible and complete it in a very short time.   We are 25 years in this business and our technical specialists have strong experience in Azure, PostgreSQL, Git, Docker, RESTful API, .NET Core, .NET Core Web API, API Development, .NET 5.0/6, CI/CD and other technologies relevant to your project.   Please, review our profile https://www.freelancer.com/u/tangramua where you can find detailed information about our company, our portfolio, and the client's recent reviews.   Please contact us via Freelancer Chat to discuss your project in details.    Best regards, Sales department Tangram Canada Inc.     

@yuliussmayoru

Hello! I’m confident I’ve found the best approach to take full ownership of your API layer on the .NET backend, delivering clean, performant, and well-tested endpoints while maintaining database integrity and microservice reliability. I will develop new RESTful and gRPC APIs that integrate seamlessly with your internal services and external partners, following best practices for security, scalability, and maintainability. I will refactor and optimize existing endpoints to improve response times, reduce latency, and ensure high reliability under load, while keeping backward compatibility where needed. I will handle database design, migrations, and optimization for SQL Server and PostgreSQL, ensuring efficient queries, proper indexing, and transactional safety across services. I will write comprehensive unit and integration tests for every new or modified endpoint, and provide migration scripts along with an updated ERD to reflect all database changes. I will produce a concise deployment guide detailing environment variables, configuration keys, and CI/CD pipeline steps so deployments to staging and production are predictable and smooth. Warm regards, Yulius Mayoru

@dfordesigners

Hi there, I specialize in .NET API development and have extensive experience with .NET 5/6, Entity Framework Core, and Azure SQL. I've successfully tackled similar projects, optimizing API performance and ensuring secure database operations. I am well-versed in Swagger/OpenAPI documentation and Docker deployment. I prioritize clean, well-documented code and thorough testing for reliable results. Let's discuss how I can take ownership of your API layer, enhancing performance and reliability while meeting your project requirements seamlessly. Looking forward to potentially collaborating with you. Best,

@mugencodes

Hello, I understand the critical need for a senior-level engineer to own the API layer of your SaaS platform built on .NET 5 and newer. My experience aligns perfectly with the tasks at hand, including developing new RESTful and gRPC APIs, optimizing existing endpoints, and ensuring database performance and security with SQL Server/PostgreSQL. I will approach this project by committing clean, well-documented code to your Git repository, providing comprehensive test coverage for all endpoints, optimizing database design and migrations, and delivering a detailed deployment guide. With my expertise in .NET 6/7, Entity Framework Core, Swagger/OpenAPI, Docker, and Azure SQL, I am confident in my ability to meet your requirements efficiently. I look forward to collaborating with your team on this exciting project. Please grant me repo access, and we can kick off the first milestone promptly. Best regards, Jayabrata Bhaduri

@DngPhgNam

⭐⭐⭐⭐⭐ ✅Hi there, hope you are doing well! I recently worked on a similar project developing scalable .NET 6 APIs for SaaS platforms, enabling quick integration with internal services and partners, which worked seamlessly to boost performance. The most important part for success in this project is ensuring robust, well-tested API endpoints coupled with efficient database design and migration. Approach: ⭕ Develop new RESTful and gRPC APIs with clean, maintainable code ⭕ Refactor existing endpoints for improved speed and reliability ⭕ Handle database migrations, design, and optimizations for SQL Server/PostgreSQL ⭕ Write comprehensive unit and integration tests, aligning with CI/CD pipeline requirements ⭕ Document deployment steps, environment configurations, and update ERD diagrams ❓ Could you please share access details to your current Git repo and any existing API documentation? ❓ Are there specific performance benchmarks or SLAs to meet for response times? I am confident in delivering high-quality, reliable API layers using .NET 6/7 and Azure DevOps that fit perfectly with your micro-service architecture. Looking forward to collaborating with you. Best regards, Nam

@AlexVydrin

Hi, this lines up well with senior‑level .NET API work and I can slot into your flow without slowing anything down. I’ve built and maintained REST and gRPC layers on .NET 6 and 7, handled schema design and migrations on both SQL Server and Postgres, and delivered endpoints that pass strict performance gates in Azure DevOps pipelines. I’m comfortable owning the API surface end to end, from shaping contracts and writing clean EF Core queries to tightening response times under load. If you want to move quickly, you can point me to the first service that needs attention and I’ll review the existing endpoints, tests and data model so we can get a clean first milestone into staging.

@rbtech1984

Hello There!!! ★★★★ Scalable .NET 6/7 API development with secure microservice architecture and optimized database performance ★★★★ I carefully reviewed your requirements and this project aligns very well with my backend development experiance. You need a senior engineer who can build and maintain high-performance REST/gRPC APIs, optimize database operations, and ensure stable deployments through Azure DevOps pipelines. ⚜ RESTful & gRPC API development ⚜ .NET 6/7 microservice architecture ⚜ EF Core database optimization & migrations ⚜ SQL Server & PostgreSQL performance tuning ⚜ Swagger/OpenAPI documentation ⚜ Dockerized deployment workflows ⚜ Azure DevOps CI/CD integration & testing I’ve worked on SaaS backend systems using .NET Core, Docker, Azure SQL, and Jira-based agile teams. I focus on writing clean maintainable code with strong unit/integration test coverage and reliabe staging deployments. I can quickly onboard into your repo, join daily standups, and start delivering milestones immediatly. Would be glad to discuss the current API structure and performance goals further. Warm Regards, Farhin B.

@ivicab6

Hi, I've worked extensively with .NET 5 and newer, particularly on API layers and backend services. I’ve developed and maintained RESTful and gRPC APIs, refactored existing endpoints for better performance, and optimized database operations for speed and security. If this aligns with your needs, let’s start with a small task to ensure a great fit before moving forward. Best Regards, Ivica

@wasifmuneer

Hi there, I’d be happy to discuss your project—feel free to start a chat anytime. I’m a full-stack developer with solid experience building scalable web and desktop applications, and I’m confident I can deliver your project efficiently and on time. I also have strong exposure to modern technologies including Web3 concepts, DevOps practices, and automation. I’m a Kubernetes enthusiast with hands-on experience using Docker containers and deploying applications on Linux servers. My expertise includes: MERN / MEAN Stack (development + team management) .NET Core APIs with Angular, including D3.js data visualizations Azure Logic Apps, SharePoint, and workflow automation (PowerApps familiarity) Salesforce development with Apex, Visualforce, and integrations via .NET APIs DevOps basics, containerization, and application hosting on Linux Automation workflows and AI-based tools to improve efficiency I bring a problem-solving mindset and full project lifecycle experience—from development to deployment. Looking forward to hearing from you. Thank you!

@vladang

I can see the challenge here isn’t just building APIs, it’s making sure they’re fast, reliable, and play nicely with both internal and external services. I’d start by mapping out the current endpoints and how data flows between services, then identify any hotspots that might be slowing things down. New endpoints I’d scaffold in .NET 7 using minimal APIs where it simplifies things, with EF Core handling migrations carefully so existing queries don’t break. For gRPC, I’d make sure contracts are versioned to avoid breaking clients, and I’d write integration tests that hit both SQL Server and PostgreSQL to catch subtle differences. One thing I’d add early is a lightweight caching layer for heavy reads, which can dramatically cut response times without complicating the API. On a past project at Bubbl, I did something similar with Vue/Nuxt and Express, and it reduced latency by almost 40%. Could you clarify if external partners expect any strict SLAs on response times, and are there existing API versioning conventions in place? I’m ready to start digging in as soon as access is granted.