Senior Ruby Backend Engineer with affinity for observability

As a Senior Backend Engineer with an affinity for observability, you would be supporting both a customer-facing and an advisor-facing product that run on Vue.js, GraphQL, and Ruby on Rails, powered by AWS. Our customer-facing products include complex calculators wrapped in a simple UI, with a powerful calculation engine that takes thousands of mortgage products and optimizes them for our customers.

Our advisor-facing products include a fully-fledged back-office that ensures customer interactions over email, chat, and telephone - as well as the processing and handling of mortgage applications and financial documents - are reliable, efficient, and secure.

You’ll help ensure our calculation engines, back-office tools, and customer-facing platform become more resilient and secure as we grow.

Individuals who like getting things done

Excellent communication skills, able to work closely with backend engineers and product teams

Eagerness to understand the systems end-to-end, from application code to the infrastructure it runs on

Someone who is as comfortable writing infrastructure-as-code as they are debugging a production incident

A pragmatic approach to reliability - building the right amount of resilience, focussing on the key building blocks and clean architecture

Our technology stack

️ Backend

• Ruby 4.0 (Rails 8.1)
• PostgreSQL 16
• Serverless Ruby, Node.JS, Python

️ Frontend

• Vue.js 3
• CSS3 (flex & friends)

Infrastructure

• AWS: ECS, Lambda, RDS, CloudFront
• Terraform for infrastructure-as-code
• CI/CD pipelines

Testing & Reliability

• RSpec
• Monitoring & alerting tooling

Requirements

• Strong commercial experience with Ruby (min 4-5 years), ideally including Ruby on Rails 7/8
• RSpec experience
• Good grasp of OO patterns
• Sentry, GitHub and Datadog are your best friends
• Hands-on production experience with Terraform for infrastructure-as-code
• Working knowledge of AWS (ECS, Lambda, RDS, CloudFront, VPC networking, IAM)
• Experience building and maintaining CI/CD pipelines
• Solid understanding of observability: monitoring, logging, and alerting
• Experience with containerization (Docker, ECS or Kubernetes)
• Comfort with incident response: on-call rotations, postmortems, and root-cause analysis
• Good grasp of RDBMS operations (PostgreSQL 16+) - backups, performance tuning, failover
• A security-first mindset: familiarity with secrets management, least-privilege access, and cloud security best practices

Nice to have

• Experience with serverless Ruby, Node.JS architectures
• Familiarity with GitHub Actions
• Experience defining and tracking SLIs/SLOs/error budgets
• Scripting/automation experience beyond Ruby (Bash, Python)
• Prior experience in a regulated industry (fintech, proptech, or similar)

What can Hypofriend offer you?

A young, motivated, and interdisciplinary team with years of experience building successful digital products

Work up to 100% from home, with occasional meetings and off-sites near our Berlin Headquarters

In addition to an attractive fixed salary, you get the exciting opportunity to improve the German mortgage industry and be at the forefront of new and innovative practices

Stock options in a growing company

An 1,500 annual euro Learning budget

As a young and rapidly growing company you have an excellent career perspective

Latest Macbook and equipment to work from home

️ Urban Sports Membership

A unique 3-story office at Rosenthaler Platz

Full support to become a homeowner