Senior Ruby Backend Engineer with affinity for observability (dwm)

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 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.

Youll 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 Python

Frontend

• 3
• CSS3 (flex & friends)

Infrastructure

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

Testing & Reliability

• RSpec
• Monitoring & alerting tooling

• 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 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 1500 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