Senior Software Engineer – .NET

ShipEngine; Austin, Northern (TX, KY); Hybrid; USD 120,000 - 180,000; Full time

Benefits offered by this job

Hybrid work model

12 paid US holidays

401k matching

Merit reviews

Office in central Austin

Weekly catered lunches

Job summary

Auctane is seeking a Senior Software Engineer to architect and build scalable backend systems powering the ShipStation API. You will work across the stack, implement RESTful services, mentor engineers, and influence architectural decisions in a hybrid role based in Austin, TX.

You will design backend services with C#, .NET, and AWS, emphasize code quality, CI/CD, and DevOps practices, and collaborate with frontend teams while exploring AI-assisted development responsibly.

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.
• Demonstrated ability to use AI tools responsibly to enhance productivity.

Responsibilities

• Architect, build, and maintain scalable backend services and microservices using C# and .NET.
• Create and consume secure REST APIs for frontend/mobile consumption.
• Design, query, and optimize relational databases (SQL/NoSQL).
• Conduct rigorous code reviews and enforce engineering standards.
• Provide mentorship to mid-level and junior developers.
• Collaborate on CI/CD pipelines and cloud deployments (AWS).
• Develop unit and integration tests to ensure reliability.

Skills

.NET backend development

REST API design

AWS cloud

DevOps practices

Docker

CI/CD pipelines

Mentorship

Education

Bachelor's Degree in Computer Science

Tools

Docker

Kubernetes

Terraform

CloudFormation

AWS CDK

Job description

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)

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
• 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 recognize and reward your hard work and achievements.
• Company events, we work hard, play hard! We do our best every day, even at our regular team-building events.
• Attractive office space in the heart of central Austin, Texas (free drinks, snacks…).
• Indulge in weekly catered lunches at our office – a delicious perk to fuel your work.
• Health and Wellness: The well-being of our team is super important to us. Choose from different options that include medical, dental, and vision plans.
• Fitness center in the office with Tonal Mirrors, Pelotons, free weights, etc.
• Employee Assistance Program. We offer up to 8 free mental health sessions.
• We offer gym discounts to help you stay fit and healthy!
• We offer education reimbursement to all employees, ensuring that you can pursue your educational goals while excelling in your career with us. Invest in your future and let us support your growth every step of the way.
• Employee Referral Program! We reward employees helping us find top talent!
• An inclusive, casual and upbeat work environment. The personality and opinions of each of our team members are important and valid; we aim to offer all employees a safe environment where they can be themselves and thrive.

Additional Position Duties:

• Sit for prolonged periods of time
• Utilize wrist and hands for a prolonged period of time
• Stand for short periods
• Speaking and conversing with others
• Lift up to 25lbs without assistance up to chest height

Equal Opportunity Employer/Veterans/Disabled

If you are based in California, we encourage you to read this important information about the ShipStation Privacy Policy for California residents linked here.

Voluntary Self-Identification

For government reporting purposes, we ask candidates to respond to the below self-identification survey.Completion of the form is entirely voluntary. Whatever your decision, it will not be considered in the hiringprocess or thereafter. Any information that you do provide will be recorded and maintained in aconfidential file.

As set forth in Auctane ’s Equal Employment Opportunity policy,we do not discriminate on the basis of any protected group status under any applicable law.

If you believe you belong to any of the categories of protected veterans listed below, please indicate by making the appropriate selection.As a government contractor subject to the Vietnam Era Veterans Readjustment Assistance Act (VEVRAA), we request this information in order to measurethe effectiveness of the outreach and positive recruitment efforts we undertake pursuant to VEVRAA. Classification of protected categoriesis as follows:

A "disabled veteran" is one of the following: a veteran of the U.S. military, ground, naval or air service who is entitled to compensation (or who but for the receipt of military retired pay would be entitled to compensation) under laws administered by the Secretary of Veterans Affairs; or a person who was discharged or released from active duty because of a service-connected disability.

A "recently separated veteran" means any veteran during the three-year period beginning on the date of such veteran's discharge or release from active duty in the U.S. military, ground, naval, or air service.

An "active duty wartime or campaign badge veteran" means a veteran who served on active duty in the U.S. military, ground, naval or air service during a war, or in a campaign or expedition for which a campaign badge has been authorized under the laws administered by the Department of Defense.

An "Armed forces service medal veteran" means a veteran who, while serving on active duty in the U.S. military, ground, naval or air service, participated in a United States military operation for which an Armed Forces service medal was awarded pursuant to Executive Order 12985.

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