Senior Back-End Engineer (Python)

Who we are

ZYTLYN Technologies empowers companies across the $11 trillion travel industry to shape the future with predictive AI solutions that augment commercial planning, sales, marketing, retailing and operations. We work with some of the largest travel brands in the world, and our vision is to answer highly detailed and granular questions about the future of travel, such as demand, supply, market fluctuations and pricing. Our core focus is on airlines, airports, travel agencies, destinations, tourism boards, hotels, car rentals, travel retailers, and luxury brands.

Who we are looking for

As a Senior Back-end Engineer (Python), you will serve as a senior member of our tech team, reporting directly to the CEO in a flat organisational structure. Working closely with Engineering and Data Science, you will spend the majority of your time developing the Python-based application logic and services that power our product. Additionally, you will provide support for data pipelines as needed to assist our analytics capabilities.

Location / Contract type

• Geneva, Switzerland Office;
• Full-time, Permanent contract.

Our culture

We have a culture that focuses on empowering people, with team members working in our HQ (Geneva, Switzerland), and all across Europe (e.g. France, Spain, Italy, Poland, UK). We believe a diverse team creates better outcomes and fosters a better environment for learning and growth. We put a lot of emphasis on communication, listening, efficient processes and trusting our team. We rely on each other, and work together to achieve our common goals. We believe in working smart, with strong focus and intensity, tackling every challenge as a team.

Your work

• Own the design, development, and maintenance of scalable backend APIs and related infrastructure using FastAPI, Flask, and Postgres.
• Design and optimise backend architecture on AWS, ensuring high performance, reliability, and security.
• Champion CI/CD best practices and automated testing pipelines with GitLab CI/CD to ensure high-quality, maintainable code.
• Collaborate closely with product managers, frontend engineers, and data teams to deliver robust backend solutions that power analytics, product features, and decision-making.
• Mentor and support fellow engineers in building scalable, maintainable, and well-tested systems.
• Continuously influence and improve the team’s engineering practices, tools, and workflow.

Requirements

Basic requirements

• 5+ years of experience designing and building backend systems, APIs, or services.
• Hands-on experience with Python frameworks (FastAPI, Flask) and relational databases (Postgres).
• Proven ability to deploy and maintain applications in AWS environments.
• Strong experience with CI/CD pipelines, automated testing, and version control (GitLab/Git workflows).
• Experience with Docker and Kubernetes for containerised application deployment.
• Works collaboratively and values team success over individual credit.
• Thrives in cross-functional teams and enjoys helping others succeed.
• Highly organised, self-motivated, and able to work in a fast-moving environment.
• Strong written and verbal communication skills.

Bonus points

• Experience with frontend frameworks, particularly Next.js.
• Knowledge of MLOps practices and tools.
• Experience with embeddings, vector databases, hybrid search, chunking, reranking, tool-calling, and source-grounded LLM answers.
• Background in data engineering, including building or interacting with data pipelines or analytics systems.
• Knowledge of Infrastructure as Code tools (Terraform).
• Exposure to monitoring, observability, and performance optimisation for backend services.
• Passion for self-learning and personal growth, continuously improving skills and keeping up with new technologies.

Benefits

What we offer

• Join a team of exceptional talent - At ZYTLYN, we hire thoughtfully and selectively, bringing together a small, focused team of high performers. We believe that a lean and empowered team moves faster, builds smarter, and achieves more. You’ll collaborate with driven colleagues who value efficiency, ownership, and impact.
• Competitive salary- adjusted for experience and market benchmarks.