Senior Ruby Backend Engineer with affinity for observability (d/w/m) — Hypofriend GmbH, Berlin.
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, focussing on the key building blocks and clean architecture
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
- 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