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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.

Responsibilities

Design and implement backend services and APIs that serve millions of requests, working closely with frontend teams to create seamless user experiences.
Build new features, optimize existing systems, and make key architectural decisions that shape our platform's future.
Mentor other engineers, participate in code reviews, and help establish best practices across the team.
Architect, build, and maintain scalable, robust backend services and microservices using C# and .NET.
Create and consume secure REST APIs for seamless communication between backend services and front-end/mobile applications.
Design, query, and optimize relational databases (both SQL and NoSQL).
Conduct rigorous code reviews, enforce engineering standards, and write clean, maintainable, production-ready code.
Provide technical guidance, support, and mentorship to mid-level and junior developers.
Collaborate with the infrastructure team to configure CI/CD pipelines, deploy applications to the cloud (AWS), and maintain different environments.
Develop and maintain unit tests and integration tests to ensure application reliability.

Requirements

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

Skills

.NET
ASP.NET Core
Entity Framework Core
RESTful APIs
C# design patterns
async programming
AWS
EC2
Lambda
RDS
S3
CloudFront
SQS
API Gateway
Terraform
CloudFormation
CDK
React
DevOps practice
SQL
NoSQL
Docker
OAuth
JWT
microservices architecture
distributed systems
Git
CI/CD pipelines
monitoring
logging
performance optimization
TypeScript
event-driven architectures
message queues
Redis
CDN
AI coding assistants
OpenAI API
Claude API
AWS Bedrock

Location

Austin, TX

Work Type

Hybrid
Full-time

Experience Level

Senior

Education Level

Bachelor’s Degree in Computer Science

Benefits

Flex Time Off policy
12 paid holidays
401k employer matching program
Annual merit reviews
Company events
Attractive office space with free drinks and snacks
Weekly catered lunches
Medical, dental, and vision plans
Fitness center in the office
Employee Assistance Program (up to 8 free mental health sessions)
Gym discounts
Education reimbursement
Employee Referral Program

About the Company

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.
We embrace AI-assisted development and expect our engineers to leverage these tools effectively.
We value engineers who can critically evaluate AI-generated code, understand when to use these tools, and when human expertise is essential.
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.

Equal Opportunity

Equal Opportunity Employer/Veterans/Disabled