Back-End Software Engineer – AI & Voice Technology (Rust & Python)

At Kando, we build the OS of care — the missing layer that connects people, places of life and care systems.

Our platform links beneficiaries, caregivers, relatives and tools — across all places of life, and on any device: Kando Box, smartphone, tablet, computer. At the core of the system is Kando Mind, a contextual intelligence designed to understand real situations, reduce cognitive load and orchestrate actions between humans and technologies.

Kando was founded by people from the field. Nearly 80% of our operational team comes from the healthcare sector. Kando has been financed for more than €4M, and our solutions are used daily by hundreds of users, in collaboration with major healthcare groups in Belgium and France.

We're just getting started.

THE MISSION

We are looking for a pragmatic Back-End Software Engineer to help us build and scale Kando's cloud infrastructure. You will work on the core services that power our real-time voice AI platform for healthcare, with high ownership and close collaboration with the founding team.

Kando processes voice interactions from healthcare professionals through a sophisticated pipeline: capturing audio, transcribing speech (Speech-To-Text), understanding intent via LLMs, performing specific actions (such as automatic report generation), and sending back textual and audio (Text-To-Speech) responses. You will build the reliable, performant backend systems that make this possible.

WHAT YOU WILL DO

• Own core services: develop and maintain our Kando assistants — API design, database operations, integration with third-party services (e.g., healthcare APIs)
• AI pipeline integration: orchestrate the STT → LLM → TTS pipelines, managing audio streaming and response latency optimization
• Real-time infrastructure: implement robust WebSocket handlers and message queue consumers (RabbitMQ/AMQP) to manage concurrent voice sessions without dropped connections or race conditions
• Data engineering: design and optimize PostgreSQL schemas for healthcare data (resident records, care plans, medical reports) with proper indexing, migrations, and query performance; audio data on Object Storage (S3)
• DevOps & infrastructure: manage our multi-environment deployments on Scaleway, configure Traefik reverse proxies, maintain Docker containers, improve our GitLab CI/CD pipelines
• Reliability & observability: implement logging, monitoring, and alerting to meet healthcare-grade reliability requirements

THE STACK

• Backend: Python (FastAPI), Rust (Axum)
• Frontend: React, Flutter
• Machine Learning: PyTorch, HuggingFace SDKs, vLLM
• DevOps/Infra: GitLab CI/CD, Docker, Traefik, Scaleway, S3

WHO YOU ARE

• Experienced: 3-6 years of professional experience in software engineering, with solid backend fundamentals
• Python proficient: you write clean, typed Python, understand async/await patterns and dependency injection, and know your way around FastAPI or similar frameworks
• Rustacean: experience with Rust and deep understanding of its core concepts
• Database literate: you can design normalized schemas, write efficient queries, and debug slow joins (SQLAlchemy/SQLModel and sqlx are a plus)
• DevOps comfortable: you can SSH into a server, debug a failing container, and write a CI pipeline without hand-holding
• Reliability focused: you think about edge cases, write tests, and understand that healthcare systems need to work at 3am on a Sunday

BONUS POINTS

• Kubernetes experience
• Message queues: RabbitMQ, Kafka, or similar
• Frontend curiosity: React, React Native, htmx or Flutter
• WebSockets: real-time bidirectional communication and its pitfalls
• AI/audio experience: LLM APIs, speech-to-text, or audio streaming pipelines
• Healthcare/regulated industry: environments where data privacy and reliability aren't optional

HOW WE WORK

• Data security is a prerequisite, given our work with sensitive healthcare data
• We focus on solving real problems, not stacking features
• Strong involvement in product and UX decisions
• Short cycles, rapid prototyping, and real production deployments
• Technology serves usage: modern when it adds value, simple when it's the better choice

CONDITIONS

• Permanent contract (CDI)
• Position based in Charleroi, with hybrid remote work
• Attractive compensation package
• 4 or 5 day work week, at your choice
• Health insurance via Alan, meal vouchers, mobility budget
• MacBook Pro and high-quality equipment
• Access to best-in-class tools (JetBrains, Notion, Slack, Claude, …)

RECRUITMENT PROCESS

• First conversation with a member of the tech team (Robin or JB)
• Technical interview / case study at our office in Charleroi
• Discussion with the CEO (FX)
• Informal meeting with the team

To apply: [email protected] - https://kandocare.notion.site/Rejoins-Kando-2eb9df7e975a8090a305eea64216d7ca