Back End Developer

5 days ago

Bengaluru, Karnataka, India Zzazz Full time ₹ 1,20,000 - ₹ 2,60,000 per year

Senior Backend Engineer - Payments

Location:
Bangalore, KA

Employment type:
Full-time

We're building the system of record for how money moves through our platform: a double-entry, auditable payment ledger that powers charges, refunds, payouts, fees, and reconciliations. If you love correctness, clean data models, and high-throughput systems, you'll own one of the most critical pieces of our product.

What you'll do


•
Design & build the ledger
: Append-only journal + accounts with double- entry guarantees; immutable records with corrections via compensating entries; enforce invariants (debits = credits) at the schema and application layers.


•
Get consistency right
: Choose isolation levels, implement idempotency, and design APIs that are safe under retries and partial failures.


•
Own reconciliation
: Build daily/continuous reconciliation pipelines against payment processors and bank statements; surface diffs, exceptions, and workflows to resolve breaks.


•
Model money flows
: Support holds, captures, refunds, chargebacks, fees, partner revenue share, and multi-currency/FX with correct rounding and rate provenance.


•
Integrate processors
: Ship robust integrations with webhooks, signature verification, event ordering, and replay handling.


•
Observability & audit
: Comprehensive audit logs, traceability from external events → ledger entries → financial reporting; metrics, SLOs, and alerting for breaks or stuck money.

What makes you a great fit

Must-haves


• 5–7 years building backend systems in , NestJS, JavaScript, TypeScript.


• Deep experience with relational databases (PostgreSQL/MySQL), transactions, schema design, migrations, and query performance.


• Proven track record designing idempotent APIs, background jobs, and event processing at scale.


• Solid grasp of accounting basics (double-entry, journals vs. ledgers, trial balance) or strong interest to learn quickly.
• Strong testing discipline: property tests, fixtures, deterministic replay; comfort with production-grade observability.


• Clear communication, product sense, and ownership from design to post-launch ops.

Nice-to-haves


• Built payments/fintech/marketplace systems: payouts, split payments, escrow, invoices or wallet/accounting.


• Experience with event sourcing, CDC, Kafka/PubSub, or stream processing.


• Multi-currency/FX flows and rounding modes; localized taxes/fees.


• Hands-on with Stripe/Adyen/Braintree/Razorpay/PayU, bank files (MT940/BAI2), or virtual accounts.


• Familiarity with compliance/audit (SOX controls, PCI DSS scope reduction) and data retention policies.


• Kubernetes/cloud infra (GCP/AWS) and secrets management.

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