Position: Middle/Senior/Expert  Ruby on Rails Developer for Ciklum Digital
Company: ciklum.com
Experience required: 3y
English level: upper

About the Project:

Babbel is driven by a mission: Everyone. Learning. Languages. This means building products that help people connect and communicate across cultures. Babbel and Babbel for Business focus on using a new language in the real world, in real situations, with real people. And it works: Studies with Yale University, City University of New York and Michigan State University prove that it gets users talking with confidence.

The key is a blend of humanity and technology. A team of linguistic experts hand-craft each of our courses, to provide content that is constantly adapted to our learners’ needs. Interactive content with videos and podcasts makes understanding a new language easy, because Babbel is for everyone. That’s why our team is as diverse as our content. From headquarters in Berlin and New York, 750 people from more than 65 nationalities represent the backgrounds, characteristics and perspectives that make all humans unique. Making a true connection with millions of paid subscribers across the globe is what makes Babbel the most profitable language learning app worldwide.

Babbel in Numbers: 

The #1 top-grossing language learning app globally
Millions of active paying subscribers
More than 60,000 lessons 14 languages hand-crafted by 150+ linguists
More than 10,000 hours of learning content
Over 70 learning podcast episodes and over 50 hours of video learning content
As part of our team, we’ll collectively tackle all things engagement: how do we make sure that learners are always challenged, but never overwhelmed? That everyone coming to Babbel feels welcomed? That everyone feels motivated to pick up the app and learn something every single day?

In your role as a Senior Full-Stack Engineer, your mission will be to drive the development of a technical platform that enables seamless and effective operation of the internal Customer Support department at our company (75 members and growing). This is a really cross-functional role as the main goal for your team will be an optimisation of internal processes and a construction of a platform that aggregates and exposes various data streams and features from different Babbel products and knowledge domains. You will be collaborating with a variety of teams and departments and diving into different disciplines to broaden your knowledge in other fields of expertise as well as share your own. You will contribute to great architecture and build the base of an easily extendable and well maintainable platform.

Responsibilities:
Own architectural design and constantly propose improvements of the existing features
Deliver value iteratively by building high-quality applications and features
Build, maintain, and take ownership of a rich ecosystem of applications and services
Be part of feature teams and build end-to-end customer features
Ensure that the systems you own are healthy, resilient, and perform well
Collaborate cross-functionally on feature design, architectural decisions, and assessing technical debt
Participate in the search for ways to improve and automate corporate processes
Shape our coding guidelines and quality standards
React, troubleshoot and solve operational events (bugs and incidents)
Focus on continuous learning and improvement and drive the evolution of our engineering practices
A can-do attitude to build MVPs and iterate on them in short cycles
Experience with infrastructure-as-code, ideally with Terraform

Requirements:
Excellent knowledge in Computer Science, Computing Theory:
Paradigm & Principles (OOP, SOLID)
Database theory (RDBMS, NoSQL)
Code testing practices
Architectural, Enterprise and Design Patterns
Excellent knowledge and experience in Ruby on Rails (more than 5 years)
Practical commercial experience with:
REST API development
Strong sense for good API design and third-party API integrations
Web application frameworks, Testing frameworks, ORM
RDBMS (e.g MySQL, PostgreSQL)
Experience NoSQL databases
Key-value storages (e.g. Redis, Memcached)
Experience in using AWS
Strong understanding of Event-Driven Architecture
Testing experience on different levels: unit, integration, E2E
Version control systems (GIT)
Docker

Experience with:
Troubleshooting, profiling and debugging applications
Creation software architecture and design of complex applications, platforms
Agile software processes and technologies
Code Review process
Refactoring process
Fluent or Upper-Intermediate English

Desirable:
More than a year of commercial experience and proficient knowledge in JavaScript, HTML, CSS (incl. preprocessors and CSS in JS)
Experience with Payments, Pricing or Customer Support business domains
Experience with Data-intensive systems
Knowledge of analyzing metrics about system health and performance (ideally DataDog, CloudWatch, PagerDuty, Rollbar)
What's in it for you
Close cooperation with the client
A constant flow of new projects
Dynamic and challenging tasks
Ability to influence project technologies
Projects from scratch
Team of professionals: learn from colleagues and gain recognition of your skills
European management style
Continuous self-improvement