Software Engineer, Platform

What We Do The inbox was never built to run a business. Orders get missed, RFQs go cold, and every line gets retyped into the ERP by hand — one email, one PDF, one WhatsApp message at a time. We built AI Coworkers that do most of the repetitive work nobody wants to do instead: they read what comes in, sort it, draft linked actions, and post clean entries straight into the customer's systems of record. The team approves; Hoshii does the rest. Our Blind Spot We are currently growing faster than our infrastructure can follow, running around with duct tape to make our systems reliable while relentlessly shipping new features as well. We are looking for a Software Engineer who will be building and maintaining hOS, the base platform that enables AI agents to swiftly turn emails into one-click ERP automations. You will be an integral part of our engineering team and will ensure every single feature moves the needle. You will join the founding team of talented engineers hailing from ETH & EPFL (among others) and personally contribute to taking Hoshii to its 10x growth stage. Key Responsibilities Architect and maintain reliable, high-performance backend systems, while dealing with the non-deterministic nature of AI agents.Develop and maintain hOS, the operating system that hosts our agents, skills and knowledge bases.Collaborate with customers to identify platform needs & challenges, and deliver effective solutions.Monitor and troubleshoot production issues across services and levels of the stack, and promptly resolve business-critical disruptions that impact our customers.Write clean, tested, maintainable code and documentation. Your Profile We are looking for team players with a growth mindset and an entrepreneurial spirit: Strong coding and debugging skills.Proven experience building and maintaining backend applications using Python, Java, Go or similar.Proficiency with RESTful API design and microservices architecture.Proficiency with relational databases (Postgres) and familiarity with No-SQL (MongoDB).Proficiency with DevOps cycles: from deployment (Docker) to orchestration (Kubernetes) and monitoring (Grafana).Familiarity with message brokers (e.g., RabbitMQ, Kafka) and their use in decoupling systems and scaling load.Familiarity with distributed systems concepts (e.g., CAP theorem, consensus protocols) and microservice patterns, and their practical application to solving real-world problems.Plus: Familiarity with ERP and CRM systems.Excellent communication skills in English, good command of German.A pragmatic 80/20 instinct: you ship the 20% that unblocks the customer's real problem instead of gold-plating the other 80%.Genuinely product-minded: you instinctively separate what a customer says they want from what they actually need, and you enjoy shaping the roadmap, not just executing it.Strong sense of ownership: you love to take the lead on projects and ensure they reach success. What We Offer Autonomy and Ownership: You're in charge of your time at Hoshii; decide what you want to do, align with the team, and go for it!Stock Options: Ever owned your impact? Well, at Hoshii you get stock options, allowing you to get something back from our collective success story.A World-Class Team: We're a team of servant leaders who work hard and put customers first; we hail from top companies and universities, and we hold ourselves to the highest standards.Amazing Office Location: We have a lakeside location in Zürich with cozy corners to relax, fostering a comfortable environment where you can thrive. How to Apply Send an email to ayoub@hoshii.ai with your CV, your GitHub/GitLab link, and a short introduction about yourself. Subject: Job Application: Software Engineer (Platform)