Software Engineer, Geometry/Simulation (C++)

Fabri•Billerica, MA

11d•Onsite

About The Position

Fabri is building a fully integrated digital foundry for high-speed precision metal casting. We combine additive manufacturing, custom process software, and advanced casting operations to deliver production-quality metal parts faster and more cost-effectively than traditional methods. We are an early-stage, well-capitalized startup backed by top-tier investors and major customers. We have shipped our first customer parts and are seeing strong demand from aerospace and industrial customers. During this stage of the company, the software team works directly with the foundry. This is an on-site role for someone who wants to build software that controls, improves, and scales real-world manufacturing. We are looking for a Software Engineer, Geometry & Simulation to build the software systems that connect Fabri's digital manufacturing process end-to-end. You will primarily work across manufacturing preparation, geometry processing, and simulation, developing software that transforms customer CAD models into manufacturable production workflows. Your work will include build preparation, manufacturability analysis, workflow automation, and machine/process integration. Some projects may involve robotics, AWS, databases, or applied data science, but we do not expect one person to be an expert in all of these areas. The right candidate is a strong C++ engineer who enjoys ambiguous problems, physical systems, and wearing many hats. Python experience is a plus, but C++ will be your primary development language. You should be comfortable building reliable software around real-world processes, working directly with operators and engineers, and deciding what needs to be automated next. You will report to the CTO and own important pieces of Fabri's manufacturing software stack.

Requirements

3+ years of professional software engineering experience.
Strong programming ability in C++17.
Experience building backend systems, automation tools, geometry processing software, or technical internal tools.
Strong debugging and systems-thinking skills.
Comfortable working in ambiguous environments where requirements are not fully specified.
Interest in manufacturing, robotics, geometry, hardware, physical processes, or industrial automation.
Ability to communicate clearly with both software engineers and non-software teammates.
Willingness to work on-site and stay close to the manufacturing process.

Nice To Haves

Python Skills are a plus
Computational geometry, CAD/CAM, slicing, 3D printing, simulation, or robotics.
Experience processing or preparing 3D models for manufacturing.
Manufacturing execution systems or industrial automation.
AWS, containers, batch compute, or deployment infrastructure.
Experience working in an early-stage startup environment.

Responsibilities

Build and extend software pipelines that prepare customer parts for manufacturing.
Develop software for geometry processing, manufacturability analysis, build preparation, and production execution.
Write C++ software for geometry processing, automation, and manufacturing orchestration.
Develop software that automatically slices, supports, and validates customer geometries for manufacturing.
Generate manufacturing instructions and machine workflows from customer part geometry.
Connect internal software systems with factory workflows, operator tools, and machines.
Work closely with manufacturing, process engineering, and operations to turn factory problems into usable software.