.**Company Description**Etsy is the global marketplace for unique and creative goods. We build, power, and evolve the tools and technologies that connect millions of entrepreneurs with millions of buyers around the world. As an Etsy Inc. employee, whether a team member of Etsy, Reverb, or Depop, you will tackle unique, meaningful, and large-scale problems alongside passionate coworkers, all the while making a rewarding impact and Keeping Commerce Human.**What's the role?**Etsy's Experiment Experience team is looking for a Senior Software Engineer to help us build Etsy's next generation experimentation platform. Our team is rethinking how product teams test and validate their work - a mission critical to every team at Etsy. We are looking for an opinionated front-end to full stack engineer to help us bring a seamless user experience to our cutting-edge data science.This is a full-time position reporting to the Engineering Manager of Experimentation Experiences. In addition to salary, you will also be eligible for an equity package, an annual performance bonus, and our competitive benefits that support you and your family as part of your total rewards package at Etsy.**What's this team like at Etsy?**We are a squad of passionate full-stack engineers with a wide range of experience across engineering, experimentation, and design systems. Our team's goal is to bring Experimentation a new focus on user experience and front-end code quality.We believe that code is craft, and that the work we do is part of a larger creative culture represented by the hundreds of thousands of inspired artists and designers who make Etsy such a unique marketplace. We believe that small, empowered, self-motivated teams can do big things. We believe in measuring everything, taking advantage of our pioneering continuous deployment system to ship code early and often, and a blameless culture based on trust and a commitment to learning. We believe in close collaboration, and bring in our whole distributed team to Brooklyn for yearly gatherings.We collaborate closely both with other engineers and analysts across Etsy, so stellar communication skills are a must! We primarily write in PHP, React/Preact, and MySQL - but work closely with company level infrastructure teams to find the best tool for the job while ensuring standardization and efficiency cross-team.**What does the day-to-day look like?**- You will collaborate directly with other engineers (both senior and junior), product managers, and designers to plan out and execute on new user-facing features.- You will contribute to planning large pieces of company-critical infrastructure.- You will help onboard and mentor new and less senior engineers. You will also have access to a wide network of peers and mentors to help you grow.- You will present technical challenges and solutions to non-technical stakeholders and management