Senior Backend Engineer (AI Product)

About us:Gismart is a value-driven mobile app developer with a strong presence in the Health & Wellness, Utilities, and Music app markets. We have achieved a significant milestone of over 1 billion downloads worldwide, taking a step toward our mission of cultivating the well-being of people worldwide. With headquarters in London, UK, Gismart is a dynamic global company with a reach extending across Europe and far beyond. Our determined team comprises over 400 individuals who bring diversity, creativity, innovation, and relentless drive to the company. Gismart unites professionals from diverse backgrounds in entertainment, music, and tech, allowing us to play to each other’s strengths and succeed as a team.Our mission:Become a stepping stone on our customers’ journeys of self-improvement.Our values:Deliver what mattersRespect and support othersInitiate and ownVoiceopenlyExecute with qualityIf you are passionate about mobile app development and want to join a company that’s reshaping the industry, Gismart is the place for you. We provide exciting career opportunities, a supportive workplace culture, and the chance to contribute to a team that is making a tangible impact. For more information on Gismart, visit gismart.com.We’re looking for a Senior Backend Engineer to become the first engineering hire on a new product. You’ll play a key role in shaping the product’s technical foundation, making architectural decisions, and owning backend development end-to-end.You’ll join us at an exciting early stage as we build an AI orchestration platform — a single interface with a unified token balance across dozens of AI models. Our MVP is focused on image and video generation, with text chat and AI agents planned as the next major milestones.As one of the first engineers on the team, you’ll have a significant impact on the product architecture, technology choices, and engineering culture from day one. What you’ll bring:Core engineering:4+ years of commercial experience in ba