Senior Software Engineer - .NET

Auctane · Austin, TX

  • Senior
  • Full-time
  • Posted 2026-08-04
  • Confirmed live on 25 September 2026

Apply at Auctane

Job description

About us

At Auctane, we are united by a passion to help businesses deliver — whatever their size, wherever they are, and however they operate. We make it possible for businesses to meet the ever-changing requirements of their industry and customer expectations. Auctane products enable hundreds of thousands of businesses to annually mail and ship billions of items — over $200 billion worth — to recipients around the globe.

The Auctane family of mailing and shipping software products includes ShipStation, Stamps.com, ShipStation API, Metapack, GlobalPost, and Packlink. Our partners include Amazon, UPS, USPS, eBay, BigCommerce, Shopify, WooCommerce, and Walmart.

Our values

Win as One. Delight Customers. Deliver Great Outcomes.

About the role

We're seeking an experienced Senior Software Engineer - .NET to join our engineering team. In this role, you'll architect and build scalable backend systems that power our applications, working across our modern tech stack to deliver robust, high-performance solutions. This position is focused on the ShipStation API brand.

This position is hybrid (3 days per week in office - Tuesday through Thursday) and is located in Austin, TX.

What will you be doing?

You'll design and implement backend services and APIs that serve millions of requests, working closely with frontend teams to create seamless user experiences. Your work will involve building new features, optimizing existing systems, and making key architectural decisions that shape our platform's future. You'll mentor other engineers, participate in code reviews, and help establish best practices across the team.

• System Architecture & Design: Architect, build, and maintain scalable, robust backend services and microservices using C# and .NET.

• API Development: Create and consume secure REST APIs for seamless communication between backend services and front-end/mobile applications.

• Database Management: Design, query, and optimize relational databases (both SQL and NoSQL).

• Code Quality & Best Practices: Conduct rigorous code reviews, enforce engineering standards, and write clean, maintainable, production-ready code.

• Mentorship: Provide technical guidance, support, and mentorship to mid-level and junior developers.

• DevOps & Cloud: Collaborate with the infrastructure team to configure CI/CD pipelines, deploy applications to the cloud (AWS), and maintain different environments.

• Testing: Develop and maintain unit tests and integration tests to ensure application reliability.

What are we looking for?

Required Technologies:

• .NET - Strong proficiency in .NET, including ASP.NET Core, Entity Framework Core, and building RESTful APIs. Experience with C# design patterns and async programming

• AWS - Hands-on experience deploying and managing services on AWS, including EC2, Lambda, RDS, S3, CloudFront, SQS and API Gateway. Familiarity with infrastructure as code (Terraform, CloudFormation or CDK)

• React - Some experience with front-end JavaScript component libraries such as React.

Additional Skills:

• Background in DevOps practice

• Strong understanding of database design (both SQL and NoSQL)

• Experience with containerization (Docker) and orchestration

• Knowledge of authentication/authorization patterns (OAuth, JWT)

• Understanding of microservices architecture and distributed systems

• Proficiency with Git and CI/CD pipelines

• Experience with monitoring, logging, and performance optimization

Nice to Have

• TypeScript

• Experience with event-driven architectures and message queues

• Knowledge of caching strategies (Redis, CDN)

• Background in DevOps practices

We embrace AI-assisted development and expect our engineers to leverage these tools effectively. You should be comfortable using AI coding assistants (like GitHub Copilot, Claude, or similar tools) to accelerate development while maintaining code quality and security standards. Experience integrating AI capabilities into applications (OpenAI API, Claude API, or AWS Bedrock) is a plus. We value engineers who can critically evaluate AI-generated code, understand when to use these tools, and when human expertise is essential.

Qualifications

• 4+ years of backend development experience

• Bachelor’s Degree in Computer Science

• Proven track record of building and scaling production applications

• Strong problem-solving abilities and attention to detail

• Experience mentoring junior developers

• Demonstrated ability to use AI tools responsibly to enhance productivity

What do we offer?

• 🏠 We are a hybrid company. All team members at Auctane in Austin come into the office Tuesdays, Wednesdays and Thursdays.

• 🛬Take the reins of your time off with our Flex Time Off policy – because work-life balance should always be in your hands!

• 🌅 We offer 12 paid holidays for all of our US employees!

• 💰401k employer matching program – because your future deserves a friendly boost!

• ⭐️We conduct annual merit reviews to recogn

Prepare for the interview

Nothing collected for this employer yet. The Blind 75 is what technical screens draw from; practise it here, with a coach, in Java or Python.

More at Auctane

More like this

All open software jobs