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Senior Backend Engineer/Développeur Logiciel Backend

Reliant AI

Montreal, Quebec, Canada permanent

Posted: October 9, 2025

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Quick Summary

We are looking for exceptional backend engineers to join our team in Montreal and Berlin. As a Senior Backend Engineer/Développeur Logiciel Backend, you will be responsible for developing core backend functionality and contributing to the growth of our ambitious startup.

Job Description

🌳 About the role

We are looking for two exceptionally talented backend engineers to join our team in Montreal and Berlin. You will play a pivotal role in driving the development and delivery of our technology by multiplying our ability to develop core backend functionality and unlocking the ability of other teams to develop against this backend.

If you are passionate about building great products, enjoy working in a really fast-paced environment, and are excited about contributing to the growth of an ambitious startup, this opportunity is for you.

Our stack:

• Python / FastAPI
• PostgreSQL / MongoDB / Elastic
• Cloud LLM providers + bare metal GPUs
• GCP

As an early member of our team, you get meaningful responsibility from day one together with the opportunity to make decisions and impact our early technological stack and infrastructure.

Working in one of the most ambitious AI companies that exist today, surrounded by a great team of colleagues who are all world leaders in their respective fields, we believe we can offer an incredibly stimulating environment to do this work in.

🎯 In this role you will

• Take ownership of the delivery of complex projects; aligning with collaborators in cross-functional teams; and ensuring timely delivery of mission-critical components
• Develop a comprehensive understanding of the overall vision behind Reliant, and integrate this into the architectural and process choices you make in your day-to-day work
• Provide valuable insights to refine UI/UX concepts and contribute to the planning of backend and infrastructure development
• Proactively take responsibility for long-term code quality and architecture

📋 About you

As the ideal candidate, you will already have a successful career in backend or full-stack development to show for with a particular emphasis on rapid and repeated innovation; effective delivery and systems design that allows for scale both in opportunity and in team.

You might thrive in this role if you bring the following skills and experiences:

• 5+ years of proven experience building backend services or distributed systems
• Design, build, test, and maintain backend services and APIs that serve product features. This includes writing strong, production-quality code
• Participate in system & service design; contribute to architectural discussions and make trade-offs for scalability, latency, cost, reliability.
• Can work through ambiguity; able to translate vague or high-level requirements into implementation plans
• Collaborate with cross-functional partners: product management, frontend, UX, data, operations, etc. to define requirements, plan implementation, deliver features
• Ensure code quality: write, review, and improve unit/integration tests; participate in code reviews; maintain consistency with best practices
• Excellent communication skills: you should be able to explain technical decisions, trade-offs, possibly push back or negotiate with product or other stakeholders.

In addition, the following would be an advantage:

• Experience in machine learning, AI and LLMs
• DevOps and infrastructure experience
• Experience documenting: design docs, runbooks, best practices.
• Previous experience working in a startup or similarly fast-paced environment

🎁 What We Offer

• Competitive salary and equity package
• Opportunity to make a meaningful impact in a fast-growing startup
• A supportive, collaborative, and diverse work environment
• Flexible work hours and remote work options
• Professional development and continuous learning opportunities
• Comprehensive benefits package, including health insurance, paid time off, and more

💻 How to apply

If you are a driven Senior Backend Developer with a passion for creating stable, cutting-edge solutions, we'd love to hear from you. Apply now and join our mission to empower knowledge workers across the globe!

Reliant is an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees.

____________________________

🌳 A propos du poste

Nous sommes à la recherche d'un développeur logiciel backend pour se joindre à notre équipe à Montréal. Vous jouerez un rôle central dans le développement et la réalisation de notre technologie en multipliant notre capacité à développer des fonctionnalités backend de base et en agissant comme un pont entre l'équipe d'ingénierie européenne et l'équipe d'apprentissage automatique (“machine learning”) canadienne.

Si vous êtes passionné(e) par la création de produits de qualité, que vous aimez travailler dans un environnement en constante évolution et que vous souhaitez contribuer à la croissance d'une startup ambitieuse, cette opportunité est faite pour vous.

Notre stack :

• Python / FastAPI
• PostgreSQL
• PyTorch
• MongoDB
• Microservices

En tant que développeur logiciel backend, vous aurez des responsabilités importantes dès le premier jour et l'opportunité de prendre des décisions et d'avoir un impact sur notre stack technologique et notre infrastructure. Chez Reliant, vous participerez à la croissance d’une entreprise IA de calibre international et ferez partie d’une équipe composée de chefs de file tant côté scientifique que côté logiciel.

🎯 Dans ce rôle, vos responsabilités incluront

• Prendre en charge le développement du coeur de notre plateforme logiciel;
• Intégrer une approche multidisciplinaire dans les choix d'architecture et de processus;
• Participer au développement de l’interface usager (UI/UX) et contribuer à la planification du développement du backend et de l'infrastructure;
• Maintenir un haut niveau de qualité de notre code et de notre architecture logicielle.

📋 À propos de vous

En tant que candidat(e) idéal(e), vous avez plusieurs années d’expérience dans le développement backend ou full-stack, avez démontré une capacité à innover rapidement et de manière répétée, et êtes capable de réaliser des projets efficacement et indépendamment, tout en vous adaptant à la fois à l'opportunité et à l'équipe.

Vous ferez partie d’une équipe internationale qui opère principalement en anglais.

Vous détenez

• 5+ ans d'expérience en tant que développeur logiciel backend;
• Une compréhension des patrons de conception et technique de développement, en particulier quand au Rest API;
• Une connaissance avec des approches et des bibliothèques de logiciels de test (tests unitaires, tests d'intégration);
• Une maîtrise de la conception d'architectures évolutives et de l'utilisation du parallélisme;
• Une expérience prouvée dans la réalisation de produits logiciels innovants, à partir de la conceptualisation et de la découverte jusqu'au lancement.

Les points suivants sont un avantage :

• Une acuité technique avec de l'expérience en apprentissage automatique, en IA et avec les modèles de langage (LLMs);
• Une expérience en matière de DevOps et d'infrastructure;
• Une expérience antérieure de travail dans une startup ou un environnement de travail à un rythme rapide.

💻 Comment postuler

Si vous êtes un(e) développeur(euse) backend sénior motivé(e) et passionné(e) par la création de solutions à la fine pointe de la technologie, contactez-nous! Postulez dès maintenant.

Reliant est un employeur offrant à tous les mêmes opportunités. Nous célébrons la diversité et nous nous engageons à créer un environnement inclusif pour tous les employés.

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