IAP Software Engineering Intern 2027

Cartesian is building spatial intelligence for indoor environments to improve operational efficiency and in-store inventory visibility. The Software Engineering Intern will own a project, integrate with new customers, improve the core platform, and expand product capabilities while working alongside senior engineers to ship code to real customers.

What you'll do:

• Customer Expansion:Developing robust interfaces for data and users with international retail brands
• Platform: Modernizing our stack to Infrastructure-as-Code and upgrading our core Postgres platform for performance and resilience
• Research Tooling: Work closely with research teams to build infrastructure for machine-learning development and collecting fast, accurate edge-device sensor data
• Security and Tooling: Implementing a new system for enforcing short-lived machine-to-machine credentials, hardening our identity-and-access approach, and automating key rotation
• UI/UX: Making user interactions between our product and the physical world more seamless, ergonomic, and beautiful
• Optimization: Instrument and measure our cloud platform costs to optimize infrastructure, application, and development efficiency
• Testing: Build full-stack test infrastructure across physical devices, mobile, and backend to maintain our bar for high quality and accelerate development

What they're looking for:

• **Location**: On-site; Boston/Cambridge, MA
• **Dates:** Full-Time; January 4, 2027 - January 29, 2027
• The internship will be full-time
• If you have other commitments over IAP (e.g. clubs or classes), it probably won't be a good fit
• * **High Growth**: You're curious and learn fast. You'd rather dig into something unfamiliar than stay in your comfort zone
• * **High Ownership:** Given a task, you break it down with minimal oversight and make sure it gets done – even when it's ambiguous, or the last bit gets messy
• * **Low Ego**: You don't know everything. You want the best ideas to win. Nothing is below you
• * **Strong Coder:** You write clean, working code without heavy hand-holding, and you can explain the "why" behind your choices, not just show the result. You've worked in large codebases on a team before

Benefits:

• On-site work in the company's office in Kendall Square by the Red Line stop