Senior Software Engineer, Backend (AdTech

About Mashgin Mashgin powers the world's best checkout experience for over 40 million users. Customers just place their items on our kiosks and our AI rings up their entire order in less than a second. With Mashgin, lines are now optional. Mashgin's technology powers over 1 billion transactions at your favorite locations, including over half of all US professional sports teams, 4,000 convenience stores, major airports, universities, and more.

We’re not just building cutting‑edge AI—we’re creating real‑world impact and unforgettable experiences. Backed by a well‑funded Series B, we’re also one of the rare AI startups that’s already profitable. Our secret? A culture of extreme ownership, autonomy, and customer obsession. At Mashgin, we are building something extraordinary by challenging conventional wisdom. We’ve thrown out the old rules to focus on what truly matters: creating a kick‑ass product that makes people say, 'Wow'.

We don’t care about short‑term wins; we build systems that stand the test of time. If you thrive in a culture of excellence without compromise and want to see your work have an immediate, remarkable impact, you’re in the right place.

We are seeking a Senior Backend Software Engineer with deep expertise in AdTech and advertising platform systems. You’ll work on the codebase that enables us to develop advanced deep learning solutions that power Mashgin’s checkout experience for millions of transactions per month across the world. This role will have end‑to‑end ownership of projects, so you’ll be involved throughout the entire product lifecycle, from idea generation, design, and prototyping to execution, and shipping while contributing to many different parts of the codebase in multiple languages.

We maintain a flat, high‑impact engineering culture where every engineer who joins our team carries the title of Member of Technical Staff.

• Impact:
  You will own significant responsibility and have total ownership over your work. We stay lean and efficient, so your work directly impacts the product we ship every day
• Simplicity:
  Complexity is a waste of time here—we take pride in building things that just work
• Hard Work:
  Forget the glamorous research papers. We prioritize the hard work it takes to achieve real‑world clarity and accuracy. You will innovate relentlessly to push the boundaries of what’s possible in visual automation
• Humility:
  No task is beneath you. Whether it’s high‑level architecture or grunt work to fix a bug, we check our egos at the door and get real work done
• Ruthless Prioritization:
  If everything is on fire, nothing is. You will be expected to prioritize ruthlessly, cutting through distractions to focus on the most impactful product improvements
• Customer Innovation:
  We are customer‑centric, not customer‑pleasing. You won’t bend to every client demand; you will let innovation drive the product forward to solve the real problems our users face
• Efficiency:
  Meetings suck. We keep them short and only use them for alignment, giving you your time back to focus on real work

• Owning major feature development and working directly with the founders on product development from end to end
• Working with a small interdisciplinary team in hardware, software and design to build new versions of products from scratch
• Work on building new features and dreaming up new architecture to solve challenging problems
• Build backend infrastructure to perform scalable training in the cloud
• Rethink and recreate existing codebases for scale
• Continuously improve and maintain code that’s already in production

• 5+ years of relevant coding experience
• B.S. or higher in Computer Science (or equivalent work experience)
• Excellent knowledge of one or more of these languages:
  Python, Node.js, C++, Go, C#, Java
• Comfortable learning new languages, libraries, and frameworks when the solution calls for it
• Experience building production‑ready code that’s used regularly by lots of people

• Experience building AdTech components (e.g., ad servers, RTB bidders, OpenRTB protocols, SSP/DSP integrations, tracking engines, or predictive…