Senior Dotnet Developer

Mantis Solutions USA; Columbus (OH); On-site; USD 100,000 - 130,000; Full time

Job summary

A leading software development firm in Columbus is looking for a Senior .NET Developer with over 10 years of experience in C# and .NET technologies. This role involves designing and maintaining high-performance web applications, collaborating with cross-functional teams, and mentoring junior developers. Candidates should have a robust understanding of web APIs, software architecture, and Agile methodologies. Strong communication skills are essential for engaging both technical and non-technical stakeholders. A competitive salary and benefits package await.

Qualifications

• 10+ years of hands-on development experience in C# and .NET / .NET Core.
• Strong experience with developing Web APIs.
• Solid understanding of software architecture and design patterns.

Responsibilities

• Design, develop, and maintain high-performance web applications.
• Collaborate with teams to deliver business requirements.
• Lead and mentor junior developers.

Skills

C# Development

.NET Framework

Web APIs (RESTful services)

SQL Server

Git

Agile methodologies

Architectural Design Patterns

Communication Skills

Education

4-year college degree or equivalent technical study

Tools

.NET Core

IIS

OData

Fluent Validation

Job description

Net Developer

This position requires on site presence in Columbus.

Experience: 10+ years and preferred education: 4-year college degree or equivalent technical study with advanced study preferred.

Proven track record of hands-on technical design and code work within large complex systems.

Proven hands-on technical work with a variety of technologies.

Demonstrated technical expertise integrating a variety of diverse technical environments and cross-platform technologies.

Proven ability to present complex technical constructs to business and non-technical users.

Proven ability to collaborate with business users, project managers and technical architects.

Work experience in any combination of the following: providing solutions design, developing project plans with project manager, or recommending approach through defining tasks and/or leading meetings relating to programs for computer applications.

Knowledge of: computer and electronics, oral and written communication tools and techniques, customer support and personal service, software development principles and methods for design, development, testing and implementation of new or modified software, commonly used query language, mathematic principles relative to assigned area in IT, IT principles, methods and practices in assigned specialty area, standard software validation tools, software distribution tools and mechanisms, technical writing and documentation practices, systems performance management, requirements analysis principles and methods, back-up and recovery procedures, interrelationships of multiple IT specialties, cost-benefit analysis methods, IT lifecycle concepts.

Key Responsibilities:

• Design, develop, and maintain high-performance, user-friendly web applications
• Architect and implement reusable, scalable, and interoperable components and services
• Develop and maintain RESTful Web APIs with clean, efficient, and secure code
• Ensure code quality through proper documentation, code reviews, and best practices
• Collaborate with product, design, and engineering teams to deliver business requirements within defined SLAs
• Lead and mentor junior developers, providing technical guidance and code-level support
• Participate actively in agile ceremonies including sprint planning, reviews, and retrospectives
• Advocate for user-centric design and usability principles throughout the development process
• Troubleshoot, optimize, and enhance existing applications for performance and scalability

Required Skills & Qualifications:

• 10+ years of hands‑on development experience in C# and .NET / .NET Core
• 10+ years of experience developing Web APIs (RESTful services)
• Strong experience with .NET Core, C#, Web Services, SQL Server, IIS
• Proficient in Git or other version control systems
• Experience with OData and Fluent Validation is a strong plus
• Solid understanding of software architecture, design patterns, and best practices
• Experience working in Lean and Agile software development environments
• Strong communication skills with the ability to engage both technical and non-technical stakeholders
• Proven ability to lead teams and ensure timely delivery aligned with business SLAs

Good to Have:

• Experience with Angular or other modern front-end frameworks
• Exposure to cloud platforms (Azure preferred)
• Familiarity with CI/CD pipelines and DevOps practices