System1 is looking for a Senior Back-End Engineer who is a curious, innovative, and methodical problem solver and expert performance optimizer to join our team. In this role, you will play an essential part in defining and building our key ad serving technologies. The ideal candidate is a team player who can design and execute simple and elegant solutions to big problems around large datasets and distributed systems, focusing on performance and scale. This person will also be responsible for managing massive datasets to extract valuable insights coming from millions of users and external APIs and data feeds.

The Role You Will Have

• Build new distributed platforms from the ground up that focus on ad serving.
• Continually optimize our platforms to meet ambitious goals.
• Design and implement algorithms to efficiently process, analyze, and serve massive datasets to enable product recommendations and user engagement.
• Build, operate, and optimize large web-based systems and platforms that interface directly with real-time scoring models and support various optimization algorithms that are multi-objective in nature.
• Process user engagement data, product feeds, and APIs in real-time/near real-time and integrate with ML models that power the products.

What You Will Bring

• 5+ years of experience in back-end or full stack development.
• Bachelor’s in Computer Science or equivalent.
• Well versed with Python and Python libraries/frameworks is required.
• Passion for leveraging technology to solve problems and maximize productivity.
• Should be comfortable writing HTML/CSS and proficient in JavaScript.
• Experience building scalable and reliable products in the cloud.
• Experience with designing, implementing, and using RESTful APIs.
• Exposure to ad serving systems and reliability requirements.
• Ability to thrive in a collaborative environment.

What We Have To Offer

• Free Uber/Lyft to and from work every day!
• Collegial and collaborative team with highly intelligent and motivated coworkers.
• Cross-team lunches and demos to foster learningUnlimited Paid Sick Time, Competitive PTO and Benefits package.
• Daily catered meals and fully stocked kitchen.
• Bi-weekly happy hour at various bars, restaurants, and venues across Los Angeles.
• Bi-weekly onsite happy hour.
• Catered dinner on Tuesdays and Thursdays.
• 401K.
• Weekly fitness class with private trainer: high intensity training, yoga, beach volleyball, beach soccer, ultimate frisbee.