Enterprise Software · Bengaluru, India
Senior Backend Engineer (Java)
You will work on the settlement and ledger services behind Meridian Exchange's B2B marketplace: roughly 40 million ledger rows a month, Java 21 on Spring Boot, Postgres 16, Kafka for event fan-out. The interesting part is not new endpoints, it is correctness under load — idempotent writes, exactly-once effects on top of at-least-once delivery, and holding p99 write latency under 250 ms as the ledger grows.
- Full-time — hybrid, three days a week on site
- 6-9 years building server-side systems, at least two of them carrying the pager for code you wrote
- Bengaluru, India
The work
What you will do
- Own two or three services outright: schema design, deployment, dashboards, and the runbook somebody else reads at 03:00.
- Move the ledger write path from single-row inserts to batched idempotent upserts keyed on a client-supplied token, targeting 8,000 writes per second sustained on the existing three-node Postgres cluster.
- Design partitioning and retention for tables now past 1.2 billion rows, then run the migration online with no read downtime.
- Review 15-25 pull requests a week and hold the line on what gets merged.
- Share an on-call rotation of one week in six, and write the incident review when it was your service.
You
What we look for
- Deep Java: you can say what allocates in a hot loop, and when virtual threads help versus when they only relocate the contention.
- Working Postgres knowledge — query plans, lock waits, index bloat, and the trade-off between a covering index and write amplification.
- Production experience with a message broker, including what you did the first time consumers fell four hours behind.
- You can argue for the boring option. Most of this codebase should stay legible to whoever joins next year.
- Comfortable talking directly to a client's engineers rather than through an account manager.
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