Senior Software Engineer Practice by Numbers · Gurugram, India · In-office (5 days) · Full-time About us Practice by Numbers builds the software dental practices run their day on — scheduling, patient communications, analytics, VOIP and payments, in one platform. Around 1,500 practices across the US and Canada use us to run their front desk. Payments is one of our fastest-growing areas, and one of the few where the software is directly responsible for whether a practice gets paid. We're investing heavily in it over the next year: new payment methods, new products built on top of the payments platform, and a lot of work on making the core more reliable as volume grows. We operate like a startup, because we are one. Scope is wide, decisions are fast, and there isn't a layer of people between you and the problem. About the role We're hiring a senior backend engineer for our Payments team in Gurugram. You'll report to our Payments engineering lead and work closely with the Payments product manager. This is a deep individual-contributor role. You'll write code, make architectural calls, and own systems end to end. What you'll work on • Backend services and APIs in Python/Django. You'll own significant surfaces outright, with performance, reliability and maintainability as first-order concerns rather than afterthoughts. • Money movement. Card-present transactions through in-office terminals, hosted payment pages, and patient-facing payment links. Each surface has its own failure modes and its own definition of "done correctly." • Recurring billing. Scheduled charges, retries, and the logic that decides when a failed payment needs a human rather than another automated attempt. • Reconciliation. Processor webhooks arrive late, out of order, or after someone has already recorded a payment by hand. Making the ledger tell the truth anyway is a real and ongoing part of this job. • Integrations. Our payment processor, plus syncing payment data into third-party practice management systems — each with its own quirks and none of them forgiving. • The data layer. Schema design, indexing, query tuning and migrations in PostgreSQL, on a database that's growing faster than it used to. • How we ship. CI/CD pipelines, test automation, and releases that are safe to roll back. What we're looking for • 7–9 years building production backends, with deep Python and Django experience and genuine ownership of systems other people depended on. • Strong PostgreSQL fundamentals — schema design, indexing, transactions, and the ability to find and fix a slow query without guessing at it. • REST API design and third-party integration experience. You've worked against external APIs that were slow, flaky, or simply wrong, and built around that. • Redis and Git-based CI/CD — you've built or meaningfully improved a deployment pipeline, not just used one. • Judgement about correctness where mistakes cost money. Idempotency, retries and race conditions should be things you've had to reason about carefully, not terms you recognise. • Clear written communication. Our team spans the US, India and Bangladesh, so a lot of thinking happens in writing. You don't need every one of these to be perfect. Strong on most and curious about the rest is enough — tell us which is which. Bonus, not required • Payments or fintech background — Adyen, Stripe, Razorpay or similar. • Card-present / POS terminal integration experience. • PCI DSS exposure. • Subscription or recurring-billing systems. • Docker/Kubernetes, infrastructure-as-code, or observability tooling (metrics, logs, tracing).