Senior Backend Engineer

We're looking for a Senior Backend Engineer to help us build the infrastructure, developer tools, and frameworks that deliver amazing educational experiences to the children.
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Lingokids is looking for a Senior Backend Engineer to join us and help us build the infrastructure, developer tools, and frameworks that deliver amazing educational experiences to the children of the millions of families that use our mobile application.

At Lingokids we encourage candidates of all different backgrounds and identities to apply. We actively seek to hire individuals with different perspectives and we are eager to continue diversifying our company's culture. We strive to be an inclusive, supportive place where you can do the best work of your career.

Our offices are in Madrid, Spain but the position is open to anyone within 2 hours of the CET timezone.

About the job:

As a Senior Backend Engineer you will take ownership, build upon, and improve the infrastructure, developer tools, and frameworks used by our product squads. 

More specifically, you will:

  • User your analytical skills to understand the needs of our product squads, and turn them into simple, well-documented, scalable, and secure services for them.
  • Document technical and architectural decisions for the benefit of both engineering and product audiences.
  • Improve and expand the system we use to track user activity and extract insights across our platform.
  • Maintain and improve internal services and infrastructure such as:
    • Our AWS deployment toolchain
    • A Redis-backed message broker
    • Integrations with third-party billing services (AppStore, Play Store, Stripe, Braintree)
    • Integrations with third-party analytics, CRM, and customer success services
  • Help keep our majestic monolith (Ruby on Rails, PostgreSQL, Redis, and Sidekiq) lean and modular.
  • Own your work from development to production and ensure its quality, maintainability and supportability.

About you:

The ideal teammate for us would be someone who believes that communication, empathy, inquisitiveness, and open-mindedness are fundamental to being successful in any endeavor.

You should have:

  • Considerable experience designing and developing APIs with Ruby on Rails (or similar languages/frameworks) that scale to thousands of requests per minute. 
  • A deep understanding of the backend stack: HTTP, Relational Databases, Background Processing Systems, Asynchronous Messaging Systems
  • Experience in both horizontal and vertical scaling of backend systems
  • Comfort working with HTML, CSS, and JavaScript, especially to build admin interfaces.
  • A DevOps mentality of owning a service all the way to production.
  • An appreciation for good User Experience (our engineers are our users and our tools strive to reflect that)

English is a must. We are a multicultural team and we are providing a service in English so, we don't care about certificates but we expect you to be able to communicate fluently.

You should feel equally comfortable communicating in long-form writing. Given the circumstances we have become a fully remote company and we are firm believers that being articulate in both spoken and written long-form asynchronous communication is key to working efficiently together.

If you think you don't tick all the boxes, we'd still love to hear from you. Nobody checks every box, and we are looking for someone excited to join the team.

We usually respond within 2 hours

Or, know someone who would be a perfect fit? Let them know!

Some of your colleagues


Unlimited remote working

You can choose to work from home indefinitely or attend to the office whenever you feel like it.

Flexible hours and work-life balance

We care about the results you bring to the team. 9 to 6 and constant commuting is not for us either.

Stock options

Joining Lingokids means you can choose to own part of the company.

Visa Sponsorship

If you need a visa to work in the EU, Lingokids will assist you during the visa process, costs-included.

Professional growth

Up to €2.000 per year for conferences, books and training.

Language Lessons

Language learning is what we’re all about! We’ll cover language classes for you to learn Spanish, English or Portuguese.

Health Care Insurance

We have optional health insurance as flexible retribution.

Feedback culture

Feedback is the breakfast of champions, and we take it seriously!

Free Friday lunch

Company allowance to be able to order lunch every Friday with Deliveroo!

Happy Hours & Retreats

From casual drinks after work to our annual retreat, you’ll have tons of opportunities to get to know your colleagues.


Already working at Lingokids?

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