Principal software engineer at Toast Bengaluru, architecting the resilient, high-scale components of the payments platform.

This full-time Bengaluru role was posted on 26 October 2026. The listing describes gaining deep expertise in Toast's payments ecosystem to enable reliable payment acceptance and processing, and architecting resilient, high-scale, mission-critical payment platform components. Requirements include 12+ years defining and implementing high-scale SaaS solutions and strong hands-on experience building fault-tolerant, highly scalable and secure distributed systems.

About Toast

Toast builds technology for restaurants and local businesses: point-of-sale, payments, and operations software. Its listings describe helping business owners operate, increase sales, engage customers and keep employees happy.

Toast has a Bengaluru engineering centre working on product areas including fraud and risk, per its listings. Learn more on Toast's website.

The role in plain terms

Principal level here is defined by architecture ownership of mission-critical payment components - the systems where downtime is directly lost revenue for restaurants. The 12+ year bar and the fault-tolerance emphasis make this one of the most senior IC roles in this list. Payments domain depth is explicitly part of the job: the listing starts with gaining expertise in the payments ecosystem, so expect a learning curve even with strong distributed systems experience.

The team and the work

Per the listing, the scope is payment acceptance and processing across Toast's platform - card networks, processors and the merchant-facing reliability layer. The role is an individual contributor architect seat, not a management role.

What the employer asks for

These requirements are quoted from the employer's listing, kept in their exact words so eligibility details are not distorted:

Strong technologist with 12+ years experience defining and implementing high scale SaaS solutions.
Have strong understanding & hands-on experience of building fault-tolerant, highly-scalable & secure distributed systems.
Proficiency with sql/nosql databases, strong understanding of distributed datastores and knowledge of when to use what.
Strong foundations in data structures & algorithms.
Strong interpersonal skills and a proven track record of building partnerships across engineering, product, customer success, and other stakeholders.
Experience shipping iterative value using agile or lean software delivery methods.
Experience of tackling complex and ambiguous problems, communicate clearly with others to solve the problem, and share knowledge to help the whole team succeed
Experience building payments & Fintech products, with at least 10+ years in the payments industry

Tools and technologies named in the listing

Backend services which follow a microservice architecture written using Kotlin, Java and DropWizard
Event driven messaging & streaming using Apache Pulsar & RabbitMQ.
Apache Camel for implementing Enterprise Integration Pattern.
React & ES6 based Frontend SPAs leveraging Tailwind, GraphQL and Storybook.
DynamoDb & Postgres as core persistence data-storage layers.
Datadog & Sentry for system and application metric and monitoring.
Splunk for log aggregation.
FireHydrant for alerting.

Who this role suits

Principal or distinguished-track engineers with 12+ years and deep fault-tolerant distributed systems experience, ideally with payments exposure. Not for senior engineers making their first architecture jump - the bar is stated plainly.

Practical notes

For principal payments roles, expect deep architecture questions on idempotency, exactly-once semantics, failure modes and reconciliation. Prepare a narrative about a mission-critical system you architected, including its worst incident.

Working at Toast

Engineering and product work at Toast covers restaurant-facing software, payments processing, and the risk systems that protect a large merchant base.

How to apply

Apply directly on the employer's site: Principal Software Engineer at Toast. We found this listing on the Greenhouse public job board (careers.toasttab.com), where it was posted on 26 Oct 2026 and was still open when we checked on 30 Oct 2026. Before applying, re-read the employer's own description in full, since eligibility details, deadlines and process steps can change at any time and the employer's page is always the final word. Tailor your resume to the specific requirements above rather than sending a generic one: mirror the skills and tools the listing names where you genuinely have them. A short, specific note on why this team and this problem interest you goes further than a long generic cover letter. Never pay a fee to apply or interview; genuine employers, including this one, do not charge candidates.

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