Career Opportunities at Blackhorn Portfolio Companies

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Back-end Software Engineer

Sustainment

Sustainment

Software Engineering
Austin, TX, USA
Posted on Nov 13, 2025

Company Overview: Sustainment is an AI-native software platform that helps US-based manufacturers easily find and work with the critical suppliers they need to build and manage their supply chains. Our vision is to reimagine American manufacturing as a hyperconnected, secure, and resilient ecosystem of local and regional suppliers who can more easily connect, interact, and do business with the industry and government customers that rely on them. We are a dual-use technology platform that supports both DoD and commercial customers in pursuit of our vision.

Job Overview: We are looking for a Software Engineer proficient with .NET. The primary focus of the role is to help accelerate the development and maintenance of our public and private APIs. You will be responsible for understanding the lifecycle of critical manufacturing workflows and helping us translate them into configurable, dynamic business logic that powers government and private organizations.

Responsibilities:

  • Attend daily stand-ups to stay up-to-date with team progress
  • Stay on top of Jira to make sure objectives and progress is well communicated
  • Take ownership of manufacturing workflows and break them down with diagrams and documentation so everyone is on the same page
  • Work with the senior developers to implement new and intuitive REST-based CQRS-like + Eventing APIs for both AI- and UI- based workflows
  • Fully-document all of your code though XML Doc Comments and end-user Markdown-style docs
  • Maintain high standards of excellence in everything you contribute to

Desired Qualities:

  • Builds partnerships and works collaboratively with others to meet shared objectives
  • Operates effectively, even when things are not certain or the way forward is not clear
  • Takes full ownership over decisions, actions, and failures
  • Develop and implement reusable, high quality, highly responsive components using angular concepts
  • Troubleshoot and resolve issues in a resilient, performant manner
  • Develop and maintain high quality, maintainable software applications by adhering to secure coding standards and practices
  • Participate in multi-resource projects in an agile environment
  • Evaluate/recommend industry standards, tools, and methods
  • Document software design and contribute to design reviews

Qualifications:

  • Bachelor's degree (computer science or related) or equivalent work experience
  • 1+ years of experience with languages, concepts, and frameworks such as: PostgreSQL, C#, Entity Framework Core, OData, GraphQL, Dependency Injection, TypeScript
  • Product-driven mindset with deep empathy for our customers and strong intuition for end-user experience and business value
  • Strong desire to work in a startup with interest to take on projects from zero to one with collaboration with the rest of the team
  • Love working hard and enjoy a fast-paced environment
  • Open mindset to exploring new language and frameworks, as well as constructive conversations and code reviews
  • Passion for operational excellence and clean code
  • Experience supporting cross-team efforts in order to roll-out a new feature or functionality
  • Passion for learning and continuous improvement
  • Strong written and verbal communication skills
  • Experience working in a Scrum/agile environment
  • Working in an early startup environment or on SaaS products is a plus

Core Technologies:

  • .NET 8+ / C# / Entity Framework Core
  • Visual Studio / Visual Studio Code
  • PostgreSQL / OpenSearch
  • Docker / Kubernetes
  • AWS Consumer / GovCloud
  • Git / GitLab
  • Datadog
  • AI / Agent-based Development

Sustainment offers a competitive benefits package for full time employees including medical, dental, vision, paid time off, company holidays, and 401K matching.

Sustainment is proud to be an equal opportunity employer. We provide employment opportunities without regard to age, race, color, ancestry, national origin, religion, disability, sex, gender identity or expression, sexual orientation, veteran status, or any other protected class.

Applicants must be authorized to work for ANY employer in the U.S. We are unable to sponsor or take over sponsorship of an employment Visa at this time.

Sustainment participates in E-Verify.