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Senior API .Net Software Developer

Security Finance -
Spartanburg, SC

Quick Apply

Job Details

Full-time

Benefits

Profit sharing
Paid holidays
Disability insurance
Health insurance
Dental insurance
Vision insurance
401(k) matching
Opportunities for advancement
Life insurance

Qualifications

Authentication
Secure web application development
Systems integration
Software engineering
Authorization controls implementation
Team leadership
Enterprise software
.NET Core
Enterprise software systems development
Professional development support
Integration Platforms (Enterprise solutions)
Mentoring
Web applications
Agile software development
Technical troubleshooting support
Business requirements
Design (software development lifecycle)

Full Job Description

Description

Senior Software Developer IV – .NET & API Development (Remote)

Build the APIs and .NET applications that power business-critical solutions.

Are you an experienced .NET developer who enjoys designing scalable APIs, building reliable integrations, and solving complex technical challenges? Do you thrive in a collaborative environment where your ideas influence architecture and your expertise helps shape the next generation of developers?

If you're passionate about developing modern .NET applications, creating secure, high-performing APIs, and delivering innovative software solutions, we'd love to meet you.

This is a remote position with quarterly travel required. Applicants must reside in one of the following states: AL, GA, ID, LA, MO, OK, SC, TN, TX, UT, or WI.

What You'll Do

As a Senior Software Developer IV specializing in .NET and API Development, you'll play a key role in designing, developing, and maintaining enterprise applications, APIs, and integration services that support critical business operations. You'll collaborate with cross-functional teams to translate business needs into scalable technical solutions while mentoring developers and helping shape our development standards.

Your Impact

Develop Modern .NET Applications & APIs

Design, develop, test, deploy, and maintain enterprise applications using the Microsoft .NET platform.
Build secure, scalable RESTful APIs and integration services that connect internal and external systems.
Develop reusable, high-performance services using modern .NET development practices.
Ensure applications and APIs are reliable, well-documented, versioned, and built with maintainability in mind.

Drive Technical Excellence

Lead the full software development lifecycle—from architecture and design through deployment and ongoing support.
Identify opportunities to improve application performance, scalability, security, and development processes.
Research, evaluate, and implement new tools, frameworks, and technologies that support modern .NET and API development.

Collaborate Across Teams

Partner with Business Analysts, architects, and stakeholders to transform business requirements into scalable technical solutions.
Participate in project planning, architecture discussions, and development estimates.
Work closely with developers, QA engineers, and infrastructure teams to ensure seamless application integrations and successful deployments.

Lead & Mentor

Provide technical leadership and mentorship to junior developers.
Conduct code reviews and promote best practices in .NET development, API design, testing, documentation, and security.
Foster a collaborative engineering culture focused on continuous improvement and innovation.

What You'll Bring

Required Qualifications

7+ years of progressively responsible software development experience.
Strong experience developing enterprise applications using C# and the Microsoft .NET platform (.NET Core/.NET).
Experience designing, developing, and supporting RESTful APIs and web services.
Experience integrating enterprise applications through APIs and service-oriented architectures.
Understanding of API security, authentication, authorization, and versioning strategies.
Experience working within Agile software development environments.
Ability to translate business requirements into technical solutions and application designs.
Strong analytical, troubleshooting, and problem-solving skills.
Excellent written and verbal communication skills.
Experience mentoring developers and providing technical leadership.
Ability to participate in occasional after-hours support as needed.

Preferred Qualifications

Experience with ASP.NET Core, Entity Framework, and SQL Server.
Experience building cloud-native applications and microservices.
Familiarity with Azure, Azure DevOps, CI/CD pipelines, Docker, Kubernetes, and cloud-based application development.
Experience with API gateways, OpenAPI/Swagger, and event-driven architectures.
Master's degree in Computer Science or a related technical field.

Why You'll Love Working Here

Outstanding Benefits

Enjoy an exceptional benefits package including medical insurance with minimal employee cost, dental, vision, life insurance, short- and long-term disability, profit sharing, a 401(k) with company match, plus generous paid vacation, holidays, and sick time.

Grow Your Career

We're committed to investing in your professional development through ongoing learning opportunities, challenging projects, and clear career advancement opportunities.

Build Technology That Matters

Work on enterprise .NET applications and APIs that support mission-critical business operations while helping modernize our technology platform.

Make an Impact

Join a collaborative engineering team where your ideas matter, your technical expertise is valued, and your contributions directly influence the future of our technology.

About Security Finance

Security Finance has proudly served communities since 1955 by providing installment loans and income tax preparation services. We believe in treating customers with respect, supporting our communities, and investing in our employees. As part of our technology team, you'll help build innovative software solutions that support our business and the customers we serve.

Additional Information

This position requires quarterly travel.

Employment is contingent upon successfully completing a background check. Only convictions directly related to the responsibilities of the position will be considered and will not automatically disqualify an applicant.

If you're ready to build modern .NET applications and APIs that make a real impact, we'd love to hear from you. Apply today!

Quick Apply

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