Principal Software Engineer - C# / .NET

Re:Build Manufacturing is a growing family of industrial and engineering businesses combining enabling technologies, operational superiority, and strategic M&A to build America’s next generation industrial company. At Re:Build we deploy deep expertise in engineering, operations management, and technology to supercharge the performance of our member companies. We leverage deep professional expertise and a candid, principled operating culture to drive differentiated outcomes. Ours is a fast-paced environment where individuals can stretch and be challenged to pursue their fullest potential.

Re:Build was founded to pioneer a profitable model for the revitalization of US manufacturing. We’ve assembled a powerful set of complimentary capabilities and lines of business that enable us to pursue a wide range of end markets. Our acquired businesses are grounded in build-to-print and by-the-hour engineering and design services, and we’re leveraging their combined expertise to migrate to increasingly sophisticated program development and production, as well as the generation of our own products. Our unique set of capabilities lend themselves to highly complex systems and products, and we offer customers a range of services including product and systems design, automation, fabrication, assembly, and large volume contract manufacturing. Our customers span a wide array of industries including aerospace, defense, mobility, healthcare, pharma, biotech, clean tech, chemicals, energy, lifestyle, food production, and industrial equipment.

Re:Build Manufacturing is seeking a Principal Software Engineer to set technical vision, elevate engineering excellence, and drive the development of scalable, high-impact software systems across our portfolio. In alignment with The Re:Build Way, this role combines deep hands-on technical leadership with a strong sense of ownership, accountability, and long-term thinking.

As a hands-on architect and trusted technical leader, you will guide critical design decisions, mentor engineers at multiple levels, and partner closely with product and business stakeholders in a candid, collaborative manner. You will bring clarity to complex problems, balancing speed and innovation with reliability, security, and maintainability to ensure solutions are built to endure.

You will thrive in this role if you are a strategic problem solver and clear communicator who enjoys tackling complex business and technical challenges in a fast-moving environment. You lead by example, raise the bar through principled engineering practices, and foster a culture of continuous improvement—helping teams deliver meaningful outcomes while staying aligned with Re:Build’s mission to build the next generation of American manufacturing

• Competitive base pay 
• Performance-based annual bonus, available to all employees
• Re:Build incentive stock awards issued annually
• Comprehensive benefits package
• High-impact role with significant autonomy and influence
• Fast-growing, investor-backed multi-site manufacturing group
• Opportunities for continuous learning, leadership, and expanded responsibility over time

What you get to do

As a Principal Software Engineer, you will play a pivotal role in shaping our technology direction and delivering high-quality software systems that power Re:Build’s diverse engineering and manufacturing operations.

• Lead the design and architecture of complex, scalable, cloud-native systems
• Make strategic decisions regarding tech stack, system design, performance, and reliability
• Set and evolve the organization’s technical strategy, including evaluating emerging technologies and driving innovation

• Establish and uphold engineering standard processes for code quality, security, performance, and scalability
• Conduct and mentor others through rigorous code reviews, design sessions, and technical deep-dives
• Author high-quality technical documentation, design specs, and architecture diagrams

• Develop and maintain high-quality, efficient, well-tested code for critically important components
• Work across multiple languages and frameworks depending on project needs (primarily C#, React/JavaScript)

• Build and deploy modern applications using serverless and containerized AWS services, including Lambda, ECS/Fargate, DynamoDB, S3, API Gateway, and Step Functions
• Design and deliver robust APIs (REST and GraphQL)

• Lead or contribute to efforts that incorporate AI/ML, generative AI, intelligent automation, and AI-assisted workflows
• Experience or strong interest in tools such as OpenAI, AWS Bedrock, LangChain, or similar frameworks is a strong plus

• Work closely with product, operations, design, and manufacturing teams to deliver impactful solutions
• Operate within and contribute to The Re:Build Way—a culture of continuous improvement, humility, and teamwork

What you bring to the Team

• 10+ years of software development experience, with deep expertise in cloud-based application development
• Demonstrated experience designing high-performance, scalable architectures
• Strong backend engineering expertise with C#, microservices, and distributed systems
• Proficiency in modern JavaScript frameworks (preferably React)
• Extensive AWS experience including serverless architectures, containers, CI/CD pipelines, and modern cloud services
• Experience with REST and GraphQL APIs
• Solid foundation in algorithms, data structures, and core CS fundamentals
• Awareness of security best practices: authentication, authorization, encryption, and compliance for cloud-native systems
• Experience mentoring engineers and shaping engineering culture
• Willingness to travel periodically
• Fluency in written and spoken English

• Experience or passion for integrating generative AI, LLMs, automation, or ML-driven solutions into production systems
• Ability to lead the adoption of AI-enhanced workflows and developer productivity tools

• Inspires, motivates, and mentors engineering teams through trust, clarity, and technical excellence
• Strong critical-thinking and decision-making skills, especially in ambiguous or complex environments
• Creative problem solver who brings new ideas and solutions to challenging technical problems
• Excellent time-management skills, with the ability to prioritize and implement in a fast-paced environment
• High degree of professionalism, integrity, and ethical conduct
• Exceptional communication—clear, concise, and collaborative
• Highly organized, detail oriented, and committed to quality
• A team-first mindset, with the ability to work effectively across functions and at all levels of the organization

•  We are seeking candidates who currently reside in the Seattle, WA or Los Angeles, CA metropolitan areas.
• This role requires quarterly travel to our downtown Los Angeles office. 

Compensation Expectations: Base salary range $130 to $260K, depending on candidate experience. Additionally, you will have an annual cash bonus and long term incentive. 

 We are a company who is going to make a difference in the industries and the communities in which we choose to operate.  

Every employee of Re:Build will share ownership in the company and will share in the financial rewards of the success we achieve together, at all levels of the company!

Re:Build Manufacturing is proud to be an Equal Employment Opportunity and Affirmative Action employer. We do not discriminate based upon race, color, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability, age, veteran status, marital status, parental status, cultural background, organizational level, work styles, tenure and life experiences. Or for any other reason.

Re:Build is committed to providing reasonable accommodations for qualified individuals with disabilities in our job application procedures. If you need assistance or an accommodation due to a disability, you may contact us at [email protected] or you may call us at 617.909.6275.