Principal Backend Engineer

Fyle is now part of Sage, a global leader in accounting and business management software. Together, we are building a global expense management solution that simplifies how businesses track and reconcile spending.

Thousands of finance teams globally use our product to streamline expense management, integrate seamlessly with leading accounting platforms, and are recognised for its clean design, usability, and speed.

Our backend runs on EKS / Kubernetes in AWS. Our microservices are written in Python / Flask, and we use PostgreSQL and RabbitMQ.

Why Join Fyle x Sage

Work with high-caliber engineers, designers, and product thinkers in an environment that values craftsmanship, autonomy, and impact.

You’ll operate with the agility of a startup and the reach of a global enterprise — shaping the frontend experience for thousands of businesses worldwide.

The Impact You’ll Make

• Work on a SaaS product used by thousands of businesses across 39 countries, helping companies track and manage employee spend.
• Engineer backend services that handle ~6 million external API requests daily.
• Set and raise engineering standards across services — design quality, API/schema conventions, observability baselines, and rollout practices.
• Shape long-term technical direction — architecture evolution, cross-service migrations, deprecations, and platform improvements with a 6–18 month horizon.
• Identify and remediate technical debt — maintain visibility, influence roadmap priorities, and ensure critical debt gets paid down.
• Eliminate anti-patterns and introduce guardrails to prevent regressions in system design, testing, and operations.
• Publish learnings through technical blogs, amplifying impact beyond the company.

What We’re Looking For

We’re looking for someone with 10+ years of professional experience building and scaling backend systems, who combines deep technical judgment with the ability to influence engineering direction across teams.

Technical Skills

• Strong command of performance engineering — skilled at defining benchmarks, measuring outcomes, and implementing optimisations to achieve and sustain high standards.
• Strong expertise in Python, PostgreSQL, Docker, Kubernetes, distributed systems, and event-driven architectures.
• Ability to develop novel solutions to complex technical problems with sound trade-off decisions.
• Writes and reviews high-quality design docs/RFCs; acts as a final PR reviewer across multiple product areas.
• Proactively learns new technologies and applies them to drive product or platform leverage.

Leadership & Ownership

• Deliver business-critical projects on tight schedules.
• Break down initiatives into milestones, estimate effectively, and deliver at scale.
• Mentor and grow engineers across levels (Engineers, Senior Engineers), providing constructive technical feedback.
• Showcase expertise across multiple areas of the product/codebase.
• Plan platform improvements and features with a 6–18 month strategic view.
• Identify and prioritise technical debt during roadmap planning and drive pragmatic remediation.

Mindset & Collaboration

• Codify and uphold engineering standards for code quality, testing, CI/CD, and observability.
• Champion quality signals (test reliability, coverage, rollout safety) and improve them over time.
• Collaborate deeply with Product, Design, and Support to align on priorities and deliver impactful solutions.
• Growth mindset — curious, always learning, and open to feedback.

What to Expect

• We value humility and collaboration — we’re looking for people who can work as part of a team, not in silos.
• We expect engineers to take ownership beyond just writing code — including tests, documentation, and long-term code quality.