CTO & Co-Founder - Proptech

Antai Ventures

🌍 ABOUT ANTAI VENTURES Antai Ventures is a leading venture studio headquartered in Barcelona, with a strong presence across Southern Europe and Latin America. We team up with exceptional entrepreneurs to build disruptive, scalable companies from scratch. Since 2012, we've co-founded 30+ ventures, including Glovo, Wallapop, PlatanoMelon, and PiperAI. Collectively, our startups have raised over $1.5B in funding, generated $3B+ in shareholder value, and created 5,000+ jobs. 💡ABOUT JURYO Juryo is building the agentic AI platform for small and mid-sized law firms, starting with high-volume B2C practices (extranjería, LSO, laboral, deudas, civil). Our voice and WhatsApp agents already qualify clients, generate documents, manage cases, and handle billing workflows, delivering over 2× improvement in lead conversion for our customers. We’ve gone from idea to revenue in months: * Multiple paying law firms onboarded * Six-digit ARR * Daily usage (+200 calls/WhatsApps) by real customers * Clear PMF in a massive, fragmented €5B+ market (in Spain alone) As a co‑founder, you’ll be in the driver's seat—shaping the vision, setting the pace, and taking ownership. In return, we’ll back you with capital and provide hands‑on support across Product, Tech, Design, GTM, Legal, Talent, Finance, and Fundraising to accelerate your journey from 0 to 1. 🛠️ WHAT YOU’LL DO * Co‑craft the technical North Star with the founding team and convert vision into an aggressive, value‑obsessed roadmap. * Build hands‑on and ship code daily, leveraging the latest AI orchestration techniques (multi‑agent workflows, toolformer, dynamic RAG pipelines) and rock‑solid engineering practices (DDD, SOLID, ruthless automation) to deliver customer value at record speed. * Recruit, coach, and scale a top‑1 % engineering guild spanning backend, frontend, data, and DevOps—shipping product that customers actually use every single week. * Design high‑throughput data pipelines to improve our agents while guaranteeing security and compliance. * Drive a culture of excellence through continuous delivery, rapid experimentation, and metrics‑driven improvement. * Move fast, obsess over customer impact, and work tirelessly to turn an ambitious vision in reality. 🔍 WHAT WE’RE LOOKING FOR * 5+ years of experience as a Software Engineer * Hands‑on builder. You prototype quickly and turn ideas into working features in days. * Practical AI experience. You’ve built with modern LLM tools—agent orchestration, RAG, embeddings—and know what works in production. * Curious and smart. You track new research and apply what’s useful. * User‑value focus. You measure success by customer impact and time saved, not vanity metrics. * Ownership mindset. You take responsibility for outcomes and think long‑term about product and company value. * Bias for shipping. You pick simple solutions, automate routine tasks, and release early and often. * Team builder. You attract and develop strong engineers and foster a supportive, high‑standards culture. * Clear communicator. You explain technical trade‑offs to both engineers and non‑technical stakeholders. 🤝 WHAT WE OFFER * Day‑1 founding seat. Jump into an ambitious startup from the ground up, with a validated concept and live pilots. * De‑risked upside. Build as a co‑founder on a path charted by Antai’s successful venture‑studio model—capital, playbooks, and network included. * Full‑stack operator support. Access Antai’s expert teams in Product, Engineering, Design, GTM, Legal, Talent, and Fundraising whenever you need them. * Significant equity. Own a sizable stake in this venture and optional carry in other Antai portfolio startups. * Founder community & investors. Join a tight network of serial entrepreneurs and top‑tier backers who’ve scaled category leaders. * Workspace flexibility. Work from our hubs in Barcelona, Madrid, or Mexico City—or stay remote and sync on frequent on‑sites.

fonio

We build AI phone assistants for small and medium-sized businesses – so they never miss a call again and can focus on what matters most. Our AI answers every call automatically. But voice is just the beginning. Our vision is to build the first fully automated CRM system in the world. 8,000+ customers. >€5M ARR. ~30% monthly growth. Target by EOY: €30M. We live ownership. You own your projects and tasks end-to-end. No politics, few meetings, direct feedback. At fonio, you'll build alongside the smartest and most ambitious people around. Apply now and become part of one of Europe's most insane growth stories! YOUR ROLE As a Forward Deployment Engineer for our Spanish and Italian markets, you work directly at the intersection of product and customer setups. You capture requirements, translate them into robust implementations, and take fonio live at customers – including integrations, automations, and ongoing optimization. You work closely with Product/Engineering and Go-to-Market, making sure deployments are fast, stable, and repeatable across both the Spanish and Italian markets. This is a Barcelona-based role, ideally suited to someone who can operate natively in both Spanish and Italian. WHAT YOU'LL DO * Capture customer requirements and translate them into concrete implementation plans * Build and roll out fonio setups in production: workflows, logic, prompts, guardrails * Implement integrations with third-party systems (APIs, webhooks, CRM, calendar, ticketing, etc.) * Develop smaller features and glue code to cleanly map customer cases * Debug under production conditions: calls, flows, edge cases, fast fixes * Build reusable templates and deployment playbooks to make setups scalable * Deliver product feedback: bring pain points and feature gaps to the team, prioritized and concrete WHO WE'RE LOOKING FOR * Solid coding skills: you can implement independently, not just configure * Strong understanding of AI systems and LLMs (prompting, tool-use, RAG, failure modes) * Workflow thinking: translate complex processes into robust, testable flows * Experience with APIs, webhooks, auth, and common integration patterns * Cloud fundamentals: deployments, observability, debugging in production * Highly pragmatic working style: ship fast, make it stable, iterate * Bonus: Voice/Telephony, n8n, TypeScript/Python, SQL, monitoring/tracing, GDPR * Spanish and Italian at native or near-native level & English fluent WHAT WE OFFER * Competitive salary: €65,000–€95,000 per year * Barcelona-based role, with relocation to Vienna for onboarding; we also have one of the coolest offices in Vienna's 7th district (lunch & dinner included) * 100% Focus Time (no regular meetings) * Unlimited budget when the ROI is right * Extreme speed (we ship almost daily) * Thousands of enthusiastic customers building the product together with us HIRING PROCESS * 15 min intro * 30 min deep dive with CTO & Co-Founder Matthias * 90 min technical interview with case study / live coding * 20 min culture fit with both founders

fonio

ÜBER FONIO Wir bauen KI-Telefonassistenten für kleine und mittelständische Unternehmen – damit keiner ihrer Anrufe mehr verloren geht und sie sich auf das Wesentliche konzentrieren können. Unsere KI beantwortet jeden Anruf automatisch. Aber Voice ist erst der Anfang. Unsere Vision ist es, das erste vollautomatisierte CRM-System der Welt zu entwickeln. 8.000+ Kunden. >€5M ARR. ~30% monatliches Wachstum. Ziel bis EOY: €30M. Wir leben Ownership. Du bist für deine Projekte und Aufgaben end-to-end verantwortlich. Keine Politik, wenige Meetings, direktes Feedback. Bei fonio wirst du gemeinsam mit den smartesten und ambitioniertesten Menschen weit und breit bauen. Bewirb dich jetzt und werde Teil einer der krassesten Wachstumsstorys Europas! DEINE ROLLE Als Lead Product Designer übernimmst du die Verantwortung für unser gesamtes Design, Branding und Team. Du gestaltest nicht nur Interfaces, sondern prägst aktiv, wie sich fonio für tausende Unternehmen europaweit anfühlt – vom ersten Touchpoint auf der Website über das Produkt bis hin zu jedem Detail der Brand. Du bist Senior IC mit Lead-Ambition: aber zu 100% Hands-On Design. DEINE AUFGABEN * Hands-On Product Design, Kundeninterviews & Branding (50% deiner Zeit) * Ownership von 3 Produktbereichen im Sparring mit Product Engineering * Ownership der Brand im Sparring mit unserem Staff Designer * Leadership des Design Teams – Website, Branding & Product Design (50% deiner Zeit) * Enge Zusammenarbeit mit Engineering & Founders – kurze Wege, schnelle Entscheidungen * Kundenverständnis aufbauen: du sprichst regelmäßig mit echten Kunden (Handwerker, Ärzte, Kanzleien) und übersetzt Insights in Design-Entscheidungen * Den Design-Standard für fonio setzen – über Produkt, Web und Brand hinweg DAS BRINGST DU MIT * Neben all den Basics (Figma, Kundeninterviews) viel Produkt- & Analytics-Erfahrung – du designst nicht aus dem Bauch, sondern misst, was funktioniert * Senior IC mit Lead-Ambition: du hast schon Designer:innen geführt oder brennst darauf, es zu tun – ohne dabei den Craft zu verlieren * Pragmatismus: starkes Gespür dafür, viel Funktionalität einfach darzustellen – du löst Komplexität, nicht designst sie sichtbar * Erfahrung mit Design Systems und der Skalierung von Design über mehrere Produktbereiche hinweg * AI-first Mindset: du nutzt moderne AI-Tools (Cursor, v0, Claude, etc.), um 10x schneller von Idee zu Prototyp zu kommen * Deutsch als Muttersprache (DACH ist derzeit unser wichtigster Markt) + gutes Englisch fürs internationale Team DAS ERWARTET DICH * Volle Ownership über Design, Branding und das Design Team – du baust es auf, du entscheidest * Sofortiger Impact – jedes Pixel, das du shipst, landet bei tausenden Kunden * 100% Focus Time – keine regulären Meetings * Extremer Speed – wir shippen täglich * Tausende begeisterte Kunden, die das Produkt mit uns weiterentwickeln * Sehr viel kreativer Gestaltungsspielraum & Ownership DAS BIETEN WIR DIR * 80.000–150.000 € Brutto-Jahresgehalt (abhängig von Erfahrung) + Equity * 100% Remote: Falls du aber Lust auf Office hast, haben wir eines der coolsten Offices im 7. Bezirk in Wien (Lunch & Dinner included) * Unlimited Budget, wenn der ROI stimmt * Top-Equipment & Zugang zu den neuesten AI-Tools * Tooling-Budget – kauf was du brauchst, ohne bürokratischen Beschaffungsprozess * Direkte Zusammenarbeit mit den Gründern und einem starken Team BEWERBUNGSPROZESS 1. 15 min Kennenlernen 2. 30 min Deep Dive mit CTO & Co-Founder Matthias 3. 90 min Technical Interview mit Case Study 4. 20 min Culture Fit mit den Gründern