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, 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, proptec