Senior Ruby Backend Engineer with affinity for observability (d/w/m)

Hypofriend has helped thousands of customers navigate the difficult journey of buying a home. Our online platform helps customers from calculating their affordability to getting matched to relevant properties to calculating and processing the optimal mortgage.

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.

Tasks

• 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, focusing 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)

Benefits

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