Principal Back End Engineer (Ruby / AWS / Postgres / Redis) Hybrid (UK – Remote-first with London office) £95k - £120k Benefits Albany Growth are partnering with a high-growth UK-based SaaS company backed by recent investment and now ready to scale their engineering team with 2 senior hires. They are now hiring a Principal Engineer to drive backend excellence across a complex, high-availability platform used by global customers. This is a hands-on senior leadership role with significant influence across engineering standards, architecture, and mentorship. You'll work across a modern Ruby-based stack, and play a key role in scaling platform infrastructure and guiding technical decisions that impact millions. Key Responsibilities Lead the design and development of backend services in a mission-critical platform Set and uphold engineering best practices across performance, testing, security, and delivery Mentor peers and contribute to the technical and professional growth of the wider team Own features from concept to production, balancing architectural integrity with delivery pace Collaborate closely with product and engineering leadership on roadmap planning and system evolution Contribute to compliance-focused, change-controlled deployments with high DORA metrics (elite-level performance) Continuously improve tooling, observability, and infrastructure to support scalable growth Key Requirements Proven experience as a Principal / Lead / Staff level Engineer, ideally in SaaS or platform environments Expertise in Ruby on Rails and strong understanding of distributed backend systems Experience with infrastructure at scale—ideally across AWS, Terraform, Kubernetes, Postgres, Redis Comfortable working in fast-paced, collaborative, remote-first environments Strong communication and mentoring skills with a product-oriented mindset Remote-first (UK-based) £95k - £120k base 5% pension private healthcare benefits Mission-led product with complex real-time challenges Modern stack: Ruby on Rails / AWS / Terraform / Kubernetes / Go (for performance-critical paths) If you're ready to shape backend systems that underpin global infrastructure, apply using the link and we’ll be in touch with further details. Principal Back End Engineer (Ruby / AWS / Postgres / Redis) Hybrid (UK – Remote-first with London office) £95k - £120k Benefits