Senior Software Engineer (Onsite)

Burlington-Massachusetts-United States of America April 10, 2026 Full Time

Cooling performance limits high-power computing, semi-conductor fab, cell networks, photonics, power electronics, and most of our digital world. Alloy Enterprises enables customers to break through these constraints with novel complex metal components that dramatically improve heat dissipation in high-performance systems. Alloy’s patented Stack Forging™ process enables complex micro-geometries, resulting in single-piece, leak-tight parts that deliver superior cooling performance, lower pressure drops, and exceptional reliability. Founded in 2020, Alloy is a 45-person hardtech startup that has raised over $50M in capital and is shipping components to customers manufacturing servers, lasers, semiconductor equipment, and defense systems.

What are we looking for:

We are looking for a Senior Software Developer who will work with an interdisciplinary team to design and implement Alloy’s software throughout its lifecycle. An ideal candidate has front-end and back-end experience for desktop applications, has exposure to embedded Linux systems, and has architected an entire software ecosystem before. The candidate will work to define, design, develop, implement, and test Alloy’s software suite for customers and internal development. Strong communication, flexibility, and the desire to “wear many hats” will all be essential skills for any successful applicant. You will be joining a team of startup veterans who are no strangers to hard tech.

This role generally requires 4 days onsite per week.

Responsibilities

*Responsibilities are subject to change based on shifting business needs

  • Be a part of designing and building a full software stack that will run end-to-end workflows for a novel manufacturing process

  • Be an early member of the software team, working crossfunctionally to push the envelope of what is possible

  • Write code that has to be deployed on user desktop applications

  • Have ownership of Alloy’s legacy slicer software

  • Work with external UX designers and developers Take products and features from requirements definition to proof-of-concept prototypes to production ready, durable code

  • Drive development of the backend and frontend applications considering customer workflow and dataflow

What you’ll bring

  • Comfort in a fast-paced startup environment with a bias towards action

  • Able to balance long-term strategic thinking with short-term focus on details

  • 4-year degree with a Master's preferred in fields such as Computer Science, Computer Engineering, Mathematics, or Physics (or equivalent experience)

  • 5+ years of industry experience building, testing, and shipping high quality code required

Preferred skills:

  • Comfortable developing for both front-end and back-end desktop applications, and preferably worked with embedded linux environments

  • Experienced in production Python and modern C++ object oriented design and development, design patterns, and software development methodologies

  • Experience architecting full-stacks considering customer workflow and process dataflow

  • Have broad applications experience and have shipped desktop apps before

  • Worked in a relevant field such as additive manufacturing, industrial inspection, 3D CAD tools, motion planning or control

  • Experience developing in an agile production code environment

Johnson Controls International plc. is an equal employment opportunity and affirmative action employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, national origin, age, protected veteran status, genetic information, sexual orientation, gender identity, status as a qualified individual with a disability or any other characteristic protected by law. To view more information about your equal opportunity and non-discrimination rights as a candidate, visit EEO is the Law. If you are an individual with a disability and you require an accommodation during the application process, please visit here.

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