<p style="min-height:1.5em"><strong>tl;dr: </strong>We're building a 3D first-person adventure game where an AI companion is the core of the game. Think <a target="_blank" rel="noopener noreferrer nofollow" href="https://store.steampowered.com/app/2527500/MiSide/">MiSide</a> with LLMs, but truly integrated with gameplay, not just a RP chatbot.</p><p style="min-height:1.5em"></p><h2><strong>About Us</strong></h2><p style="min-height:1.5em">Here at <em><strong>Spellbrush</strong></em>, we're passionate about making a good anime game.</p><p style="min-height:1.5em">We also happen to be the world's leading generative AI studio—we're the team behind <a target="_blank" rel="noopener noreferrer nofollow" href="https://nijijourney.com/"><em><strong><u>niji・journey</u></strong></em></a>.</p><p style="min-height:1.5em">Our mission is simple: <strong>use AI to bring characters to life</strong> and push the boundaries of narrative-driven games.<br /><br /><strong>What We’re Building</strong></p><p style="min-height:1.5em">We’ve developed an in-house LLM storytelling system that blends AI, story, and gameplay—going far beyond shallow “chat-only” experiences.</p><p style="min-height:1.5em">The result is an AI companion who cooperates with you in puzzles, remembers across worlds, and changes how each chapter unfolds.</p><h3></h3><div style="text-align:left"><img style="max-width:100%" src="https://app.ashbyhq.com/api/images/user-content/89c1442c-bd9c-46be-a910-20b49b5d9ffc/bc53bc2c-874c-41d1-9cb6-e53b0e40720e/IMG_3723.png" /></div><p style="min-height:1.5em"></p><div style="text-align:left"><img style="max-width:100%" src="https://app.ashbyhq.com/api/images/user-content/89c1442c-bd9c-46be-a910-20b49b5d9ffc/4eb88211-27a0-422d-8294-6660e04ba96c/IMG_3724.png" /></div><p style="min-height:1.5em"><em>In-game screenshots (development build)</em></p><p style="min-height:1.5em"></p><h1><strong>About The Role</strong></h1><p style="min-height:1.5em">You will join a small but extremely talented team to define a new kind of video game experience. You'll work alongside top otaku minds in the industry, including the creator of <a target="_blank" rel="noopener noreferrer nofollow" href="https://warudo.app/">Warudo</a> and <a target="_blank" rel="noopener noreferrer nofollow" href="https://cytoid.io/">Cytoid</a>, a Google Deepmind veteran behind <a target="_blank" rel="noopener noreferrer nofollow" href="https://www.youtube.com/watch?v=JcDBFAm9PPI">Project Astra</a>, and top-tier AI researchers.</p><p style="min-height:1.5em">As an early member of this team, you will have significant artistic and research freedom to shape what could become the next-generation LLM-driven storytelling experience.</p><p style="min-height:1.5em"></p><h2><strong>Why You'll Love Working With Us</strong></h2><p style="min-height:1.5em"><strong>Impact and Ownership:</strong> As an early team member, you'll have the opportunity to push the boundaries of what's possible at the intersection of the AI, anime, and video game industry.</p><p style="min-height:1.5em"><strong>A World-Class Team:</strong> You'll work directly with some of the best AI researchers and engineers in the world in a small, mighty, and fast-paced team.</p><p style="min-height:1.5em"><strong>Unparalleled Resources:</strong> You will have a generous amount of compute to build the best possible models for anime characters.</p><p style="min-height:1.5em"><strong>Culture:</strong> We are seeking individuals who ideally are fans of anime and the anime aesthetic. We believe in the unmatched speed of in-person collaboration.</p><p style="min-height:1.5em"><strong>International Opportunities:</strong> We have primary research offices in downtown Akihabara, Tokyo, and San Francisco. Visa sponsorships are available for qualified candidates<br /><br /></p><h1><strong>You may be a good fit if:</strong></h1><h3><strong>You have published or have industry experience with LLM post-training</strong></h3><p style="min-height:1.5em">You have a deep understanding of LLM training and evaluation with attention to detail.</p><p style="min-height:1.5em">Bonus if your post training work is focused on roleplay.</p><p style="min-height:1.5em">Bonus if you have worked on latency optimization. We need to interact with the character in real time.</p><h3><strong>You have worked on gathering human feedback</strong></h3><p style="min-height:1.5em">Whether that is by designing a RLHF-style voting system, or by finding implicit signals in the human-AI interaction logs.</p><h3><strong>You have worked on LLM infrastructure</strong></h3><p style="min-height:1.5em">Training LLMs requires both research and engineering. Experiences in building data processing backend, deterministic and checkpointable data loader, sharding, memory saving techniques, scalable benchmarking and checkpoint selection, are all helpful.</p><h3><strong>You love anime and the anime aesthetic</strong></h3><p style="min-height:1.5em">As a member of our team, you'll have the opportunity to push the boundaries of what's possible in the anime and video game industry. Ideally you're a fan of the genre.</p><h3><strong>You're comfortable working on small, fast-paced teams</strong></h3><p style="min-height:1.5em">Our engineering team is small but mighty. You'll be working directly with some of the best AI researchers and engineers in the world.</p><p style="min-height:1.5em">We also believe in the unmatched speed of in-person teams, and prefer on-site collaboration in either our primary research office in Tokyo (downtown Akihabara) or San Francisco. Visa sponsorships are available.</p><h3><strong>You can effectively balance research exploration with product-focused development</strong></h3><p style="min-height:1.5em">Or, putting it in RL jargon, exploration and exploitation. You excel at working with research teams to synthesize high-impact needs, design and implement technical solutions, and communicate deliverables and tradeoffs.</p></br>