Senior Backend (Golang) Developer - build the world's first conversational private bank

Our client is the world’s first conversational private bank.
They are building the smartest interface between customers and their money, providing the "unfair financial advantage" usually reserved for the ultra-wealthy.

Founded in January 2026 and backed by top European VCs, they are assembling a world-class team to deliver an AI-native banking experience built on transparency, simplicity, and trust.

Youmanista is recruiting several senior backend golang developers for this early-stage company.

🧠 Your Mission
You will join a fast-moving team to build the AI brain behind the app. Everything you build will directly shape how customers interact with their finances.

🛠 Key Responsibilities
• Production Systems: Design, build, and operate core backend services (account management, transaction processing, real-time sync).
• API Design: Own robust, well-documented APIs (REST/gRPC) for our mobile app and internal services.
• Distributed Systems: Build high-throughput, low-latency infrastructure for financial data flows (messaging, queuing, event sourcing).
• Security & Access: Implement fine-grained permission models (least-privilege) in a multi-tenant environment.
• Reliability: Own operational excellence—observability, alerting, and incident response.
• Collaboration: Work hand-in-hand with AI/ML and Infra teams to ship intelligence reliably.
• Hiring: Help scale the team by interviewing and shaping technical assessments.

🎓 Skills & Knowledge
Must Have: ✅
• AI Mastery: Expert-level proficiency with AI coding tools (Claude Code, Cursor, etc.)—leveraged aggressively but never blindly.
• Go Expert: Expert-level Go skills with production backend experience.
• Systems Design: Hands-on experience with distributed systems, event-driven architectures, and resilience patterns.
• Infrastructure: Solid experience with Docker and Kubernetes.
• Data: Strong understanding of relational databases and data modeling.

Nice to Have: ✨
• Workflows: Experience with Temporal.
• Auth: Familiarity with Zanzibar-style systems (SpiceDB, OpenFGA).
• Industry: Prior experience in regulated sectors (Finance, Healthcare, etc.).
• Streaming: Experience with Kafka or NATS.

👤 About You
• Experience: 5+ years in backend engineering with a track record of operating production systems.
• Autonomy: You drive technical decisions and set a high bar for quality.
• Full Lifecycle: You care about how code runs, scales, and debugs—not just writing it.
• Growth Mindset: You thrive in early-stage environments with high ambiguity and real ownership.
• Mission-Driven: You want to break the traditional finance mold to build something genuinely better.
• Communication: English fluency is required; French is a plus.

📋 Interview Process
We aim to complete this within 2 weeks.
1. Discovery Call (30 min): Background, motivations…
2. Technical Deep-dive (1 hr): Production systems, data, and AI engineering.
3. On-site Pairing (2 hrs): Work with the team on a real-world problem.
4. Culture Fit: Coffee, lunch, or a drink to get to know the team.

🎁 Contract & Perks
• Contract: Full-time permanent (CDI).
• Salary: Starting from 80k+ euros (depending on experience) + BSPCE stock options.
• Remote: 3/5 days in our Paris office + 3 weeks per year full remote.
• Hardware: Best-in-class laptop + Unlimited Claude AI plan.
• Benefits: 100% covered health insurance & 100% Navigo pass coverage.