Senior Backend Developer

Technology · Paris, IDF
Department Technology
Employment Type Full-Time
Minimum Experience Mid-level

About October 

October ( is a leading European data-driven FinTech company. Our mission is to finance businesses better. We change the way SMEs finance themselves, reduce their dependency on banks and deliver faster and better value than traditional players. We are passionate about making SMEs grow and have provided hundreds of millions of euros to thousands of European companies.

With October Connect, October is now bringing its digital lending expertise to financial institutions to better monitor their portfolio performance and enrich their risk analysis.

Our team currently consists of 100+ people in Paris, Madrid, Milan, Amsterdam and Munich. And we have the ambition of recruiting 50 more by 2022.

At October we believe that a great culture is fundamental to our success and therefore we put a strong emphasis on our company values.

Tech at October 

We think reinventing financing is a massive tech challenge, that’s why we built October as a tech and data-driven startup. Today, 15 developers are working on building the best financing experience ever made, very closely to the Product team.

We love JavaScript at October. That’s why every part of our stack is based on JS: we use Node.js (with some TypeScript) and MongoDB on the back-end, Ember.js on the front-end, and React Native on mobile. The platform runs on AWS, deployed using Terraform and Github Actions. You can take a look at our whole stack here:

We believe in ownership and mentoring at October. By following good code practices and through code review, we make sure to deliver quality code and allow developers to grow their skills.

We follow the Scrum methodology: the Tech and Product teams are split in 3 squads, a 4th squad being built currently.

Your daily work

  • Write technical specifications for the features defined with the Product team
  • Write clean Node.js / TypeScript code with related tests
  • Help build a scalable infrastructure on AWS
  • Build a robust API consumed by our Web / mobile apps and our SaaS clients
  • Review code from other developers
  • Improve our product, technical stack, and processes
  • Help junior developers grow in the team
  • Design and deliver complex features or architectures

What we need from you

  • You have at least 4 years of experience as a developer
  • You’ve built a backend using an OOP or functional programming language
  • You’re fluent in JavaScript / TypeScript or eager to learn it
  • You have experience with a DBMS (SQL or NoSQL)
  • You have knowledge of the code quality best practices (tests, CI/CD, …)
  • You’re curious and eager to extend your technical skills
  • You can speak and work in English


We follow a 4-steps interview process (2/3 weeks):

  1. First, an introduction call with our Talent Acquisition Manager (20min)
  2. Then, a JavaScript take-home exercise (1 week to do it)
  3. A Technical interview with the CTO and a developer (1h30)
  4. A Product interview around data modelisation with the CPO and a developer (1h)

We don’t believe in resumés and motivation letters. Just send us a link to your LinkedIn or GitHub profile.

Life at October

We are a European startup challenging the status quo. We’re trying to reinvent an ageing industry by gathering tech-oriented, passionate and smart people. Besides daily stimulating challenges, we offer the following perks:

  • The hardware of your choice
  • RTT allowance (6 to 10 days per year)
  • Remote-friendly culture, the Tech team is spread across Paris, Lyon, Nantes, Montpellier, Lisboa. Up to 4 days of remote working per week for employees based in Ile-de-France
  • We gather at least monthly for after-works, weekly for sport sessions (climbing and yoga)
  • Fruits, snacks, and coffee all day long
  • Lunch coupons (Swile), and exceptional health plan (Alan).
  • Monthly “fireside chats”, where projects, updates, strategy are discussed with all the October teams
  • “Always improve” culture: access to online trainings, monthly October Talks to spread knowledge on a specific topic to teammates

Our main office is in the centre of Paris (Saint-Lazare), but we gather once a year with the 4 other offices for a 2-days offsite.

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Your application data will be treated according to our Data Protection Policy

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  • Location
    Paris, IDF
  • Department
  • Employment Type
  • Minimum Experience