Senior Backend Engineer

cozycozy.com; Île-de-France; On-site; EUR 50,000 - 75,000; Full time

Benefits offered by this job

Competitive salary

Stock options

Health insurance

Unlimited coffee, tea, and snacks

Job summary

Cozycozy is looking for a Senior Backend Engineer to join our team in Paris. You will work on scalable APIs, handle live data streams, and greatly impact travel discovery.

We value initiative and creativity while providing a hybrid work environment that includes competitive salary, stock options, health insurance, and amenities like unlimited snacks.

Qualifications

• Strong experience with Node.js + TypeScript/JavaScript and RxJS.
• Deep knowledge of MongoDB, PostgreSQL, and caching systems.
• Experience designing and maintaining REST/gRPC APIs.

Responsibilities

• Evolve core APIs to deliver millions of fresh results quickly.
• Design and build scalable services managing high-volume data streams.
• Collaborate on architecture decisions for platform growth.

Skills

Node.js + TypeScript/JavaScript

RxJS

MongoDB

PostgreSQL

Caching systems (Redis, Dragonfly)

Rest/gRPC APIs

Kubernetes

Docker

CI/CD practices

Google Pub/Sub

SQS

Job description

Job description

Cozycozy is the only platform that gives you real-time access to all available holiday accommodations. Whether you're searching for a hotel, apartment, hostel, villa, or even a treehouse, our service features over 20 million listings from over 100 booking sites. You will find popular options like Airbnb, Booking.com, Abritel/VRBO and hotels.com, as well as plenty of specialised marketplaces to explore, such as Agriturismo, Gîtes de France, Onefinestay, Belvilla, Sonder, Travelski, and many others. Experiencing rapid growth, we are now present in over 50 countries in 20 languages, with offices in Paris and Budapest.

About the role

At cozycozy, we’re building the world’s best accommodation metasearch platform making travel simple, transparent, and inspiring. We already process millions of searches, and we’re growing fast. To keep up, we’re looking for a Senior Backend Engineer who’s excited to work on real-time systems, fresh data pipelines, and scalable APIs that power travel discovery for users around the world. You’ll write clean, high-quality code and take part in continuously evolving our features based on real user needs.

The position is a hybrid role based in our office in central Paris.

Your mission

You’ll join our engineering team and take end-to-end ownership of the backend systems that make cozycozy.com run.

In your first months, you’ll:

• Evolve our core APIs to deliver millions of fresh results, fast by helping users find the right stay in a few clicks.
• Design and build scalable services that manage high-volume data streams from dozens of partners.
• Collaborate on architecture decisions to prepare our platform for rapid growth.
• Work closely with product and data to ship new features that directly impact travelers’ choices
• Continuously improve performance and reliability because in travel search, speed is everything

This is a role for someone who loves to build, experiment, and iterate quickly. You won’t just maintain systems, you’ll invent them.

About you

You’re not just a backend engineer, you’re someone who likes to own problems end-to-end and ship solutions that make an immediate difference.

You might be a great fit if you have:

• Strong experience with Node.js + TypeScript/JavaScript and RxJS
• Deep knowledge of MongoDB, PostgreSQL, and caching systems (Redis, Dragonfly)
• Experience designing and maintaining REST/gRPC APIs (GraphQL is a plus)
• Hands-on exposure to Kubernetes, Docker, and modern CI/CD practices
• Comfort working with queue systems (Google Pub/Sub, SQS) and event-driven architectures
• Motivation to be in an international (English speaking) work environment
• Experience handling streams of live data in a marketplace-like ecosystem
• A product mindset. You care about user experience and data freshness as much as technical elegance

Bonus: If you’ve worked with GoLang or Python, real-time analytics, or large-scale search platforms.

Why join Cozycozy?

You’ll operate in a key role in the development of a fast-growing travel-tech startup.

You will work closely with founders and fellow engineers in impact-led small teams.

We encourage initiative, creativity, and ownership. The systems you build will power millions of searches used by real travelers.

Enjoy our office in Paris with unlimited coffee, tea, snacks, and drinks.

Competitive salary, stock options, Alan health insurance, and Swile card.

Our hiring process

• HR interview with Mia, our Head of Talent
• 1:1 interview with the Hiring Manager (onsite)
• Technical case to present your recommendations to the CEO and our stakeholders
• Meet the team onsite

What’s Next?

Once we receive your application, we will thoroughly review your CV and cover letter and will return back to you with an update as soon as possible. We invite you to get to know more about us by visiting cozycozy.com and follow us on LinkedIn, Instagram, TikTok and Facebook.