Senior Software Engineer

practice-by-numbers; Gurugram District; On-site; INR 4,000,000 - 6,000,000; Full time

Job summary

Practice by Numbers is hiring a Senior Backend Engineer for its Payments team in Gurugram. You will own significant backend surfaces, architect systems end to end, and collaborate with product managers to deliver reliable payment features.

The role emphasizes building robust money movement, recurring billing, and reconciliation capabilities, with strong emphasis on code quality, performance, and scalable data design.

Qualifications

• 7-9 years building production backends with deep Python/Django and ownership of systems.
• Strong PostgreSQL fundamentals: design, indexing, transactions, slow-query fixes.
• REST API design and external integration experience with flaky/slow APIs.
• Redis and Git-based CI/CD: able to improve deployment pipelines.
• Judgement about correctness where mistakes cost money: idempotency, retries, race conditions.
• Clear written communication for a globally distributed team.

Responsibilities

• Build backend services and APIs in Python/Django with emphasis on performance, reliability, and maintainability.
• Handle money movement through various payment streams and ensure robust failure handling.
• Own recurring billing logic including retries and human intervention decisions.
• Implement reconciliation to maintain truthful ledgers when events arrive late or out of order.
• Integrations with payment processors and practice management systems.
• Design data layer in PostgreSQL with scalable schema and migrations.
• Contribute to shipping via CI/CD, test automation, and safe releases.

Skills

Python

Django

PostgreSQL

REST API

Redis

CI/CD

Idempotency

Communication

Tools

Docker

Kubernetes

Job description

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).