Software Development Engineer - III, Java

Onsurity; Bengaluru; On-site; INR 3,500,000 - 6,000,000; Full time

Job summary

Onsurity in Bengaluru, India, is hiring senior engineers to own a domain end-to-end (claims, wallet, subscriptions, provider network, or payments) and deliver a running system. Core tech is Java and Spring Boot, with Node services, React screens, and Kubernetes deployments.

You will design, build, and operate high-impact services in production, collaborating across teams, mentoring others, and leveraging AI tools to ship reliable, scalable software.

Qualifications

• 6+ years of professional development in Java (8+, ideally 17+) and Spring Boot.
• Production Node.js and working React.
• System design experience, both HLD and LLD.
• Kafka or similar event-driven systems in production.
• Kubernetes and containers.
• SQL (MySQL/PostgreSQL) and MongoDB, including query tuning.
• Observability setup (Prometheus, Grafana, Sentry, ELK).
• Extensive daily AI use in workflow.
• Owner and on-call experience for a system you built.

Responsibilities

• Own the high-level and low-level design of your domain, and get both reviewed before building.
• Build and maintain Java services and stable APIs that other teams depend on.
• Get money and health data right: correct, traceable, and safe to retry.
• Run your services in production, with dashboards, alerts, and on-call ownership.
• Debug hard, intermittent issues and fix root causes.
• Set technical direction, review code, and mentor other engineers.
• Use AI tools daily, while reading and owning every line you ship.

Skills

Java

Spring Boot

Node.js

React

Kubernetes

Kafka

SQL

MongoDB

Observability

System design

Tools

Prometheus

Grafana

Job description

About the Role

We're hiring a small number of senior engineers who can take a business problem and deliver a shipped, running system. You'll own a domain end to end (claims, wallet, subscriptions, provider network, or payments), including its design, release, failures, cost, and long-term maintainability. Java and Spring Boot are the core, but you'll also write Node services, ship React screens, and run your own Kubernetes deployments and Kafka consumers.

What You'll Do

• Own the high-level and low-level design of your domain, and get both reviewed before building
• Build and maintain Java services and stable APIs that other teams depend on
• Get money and health data right: correct, traceable, and safe to retry
• Run your services in production, with dashboards, alerts, and on-call ownership
• Debug hard, intermittent issues and fix root causes
• Set technical direction, review code, and mentor other engineers
• Use AI tools (Copilot, Claude, ChatGPT) daily, while reading and owning every line you ship

What We're Looking For

Must have

• 6+ years of professional development, mostly in Java (8+, ideally 17+) and Spring Boot
• Production Node.js and working React
• System design experience, both HLD and LLD
• Kafka or similar event-driven systems in production
• Kubernetes and containers
• SQL (MySQL/PostgreSQL) and MongoDB, including query tuning
• Observability set up by you (Prometheus, Grafana, Sentry, ELK)
• Extensive daily AI use in your workflow
• Prior experience as owner and on-call for a system you built

Nice to have

• Led a multi-team project or measurably improved a system's reliability, latency, or cost
• Run an incident end to end and written the postmortem
• Mentoring experience
• TypeScript, React Native, or LLM API experience
• Payments/fintech or health insurance domain exposure
• Experience with regulated or sensitive data

How We Work

High ownership, self-driven, fast with tests, and direct and low-ego. We'll assess coding, HLD, LLD, debugging, an ownership deep-dive, and collaboration.