Senior Backend Engineer (f/d/m) Ruby on Rails

This is what it's about

Please note: The part-time scope is 80-100%. You can use our office in Berlin or work completely remotely within Germany.

You want to use your Ruby on Rails experience for a good cause? You want to contribute to a product that makes a difference? You want to play a key role in our development team to drive the growth of Koalect by RaiseNow, an innovative Tech4Good company?

As Senior Backend Engineer (f/m/d) in our team you will improve and extend our product with end-to-end responsibility. You are involved in everything from research, coding, testing and deploying to documentation.

Your mission

• Design, development and maintenance of our Koalect services
• Technical (and related product) research for extending the current set of features on Koalect services
• You share your findings with other team members, including documentation
• Operational tasks in keeping Koalect stable, incl. monitoring and On-Call duty (additionally compensated)
• Cross-Team coordination to bring new features live
• Ensure code quality by performing code reviews and coaching junior team members
• Educate the team about your experience, by creating learning paths & organising knowledge sharing sessions
• Maintenance and improvement of the AWS infrastructure to ensure availability of the services in a DevOps mindset

Your profile

• Proficiency in the ecosystem of Ruby on Rails
• Knowledge of RESTful APIs and event-driven systems (designing and reasoning)
• Proficiency in AWS (EC2, ECS, EBS, RDS) and ER database systems like PostgreSQL
• Good knowledge of docker and docker compose
• Familiar with unit and functional testing as well as code reviews, git workflows, and continuous delivery approach
• Fluent in written and verbal English (at least C1)

• Striving for simplicity and when it’s not possible, keeping an eye on the devil in the details

  Nice to have:

• Knowledge with Bitbucket CI pipelines
• Experience in server administrations (linux), bash scripting
• Familiarity with security concerns in AWS

Our Tech Stack

• Ruby 3.2.2
• Ruby on Rails 7.2 (moving to 8 Q4 2025)
• Cucumber for functionals behaviour driven tests
• PostgreSQL 13 (master/master for replication), Redis
• ELK stack
• Docker containers for CI/CD, dev and production
• CI/CD on bitbucket pipelines
• Services are hosted on AWS: ElasticBeanstalk, SQS, S3, lambda, EC2, RDS, ElastiCache, Route53, CloudFront
• Vue.JS 2/3

Your learnings

You’ll become an expert in Koalect concepts. In particular

• How to develop software at a large scale - reliably and securely
• Working in a cross-functional team (front and back end)

Why RaiseNow

• A future-oriented job in a meaningful environment with an international team
• Enjoy flexibility around your working time and place: We offer flexible work schedules with annual working time as well as temporary working abroad options all in a remote first setup
• 5 weeks paid annual leave plus additional PTO days per year with RaiseNow + your birthday as PTO
• We know that time is precious: We’re part of the pledge 1% initiative, offer sabbatical options and yearly educational leave for everyone
• The perks of joining a scaleup: short decision paths, transparent communication and regular team events + one workation per year to meet all colleagues in one spot
• An innovative working environment with a culture of transparency, trust, and mutual respect
• Project autonomy and space for personal development from the beginning