Senior Backend Platform Engineer - Billing & Integrations

SUNOLLO PTE. LTD.

Singapore

On-site

SGD 120,000 - 180,000

Full time

14 days+

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Job summary

Sunollo Pte. Ltd. is seeking a Backend Engineer (Platform) in Singapore to design, build, and own revenue-critical backend systems. The initial focus is on building the billing platform foundation, followed by broader platform and internal systems.

This role suits a senior backend engineer who values ownership, clear scope, and building production-ready, reliable systems for homes in Singapore.

Qualifications

Strong backend fundamentals and shipping production systems.
Experience with PostgreSQL and practical database design.
Experience building and operating API integrations (OAuth2, webhooks, retries).
Strong understanding of system reliability, monitoring, and failure handling.

Responsibilities

Design and implement backend systems that are revenue-critical and operationally important.
Build a billing and invoicing engine supporting subscriptions and milestone-based payments.
Design clean, auditable data models and event logs with replay safety.
Integrate with third-party systems such as Xero using OAuth2, APIs, and webhooks.
Implement secure and reliable background jobs and workflows (subscriptions, reminders, billing milestones).
Ensure system reliability through logging, monitoring, alerting, and failure recovery mechanisms.
Build backend APIs to support internal admin tools and customer-facing applications.
Collaborate closely with product, finance, and operations teams to deliver correct system behaviour.
Write well-tested, maintainable code for critical system paths.