Backend Engineer (Platform)
5000 - 7000 SGDSUNOLLO PTE. LTD.
Sunollo is building a premium residential energy platform that combines high-quality hardware, reliable installation operations, and software to make clean energy simple for homes in Singapore.
We are looking for a Backend Engineer (Platform) to design, build, and own revenue-critical backend systems. The initial focus of this role is to build the foundation of our billing platform, followed by broader platform and internal systems.
This role is suitable for a senior backend engineer who enjoys high ownership, clear scope, and building production systems that are reliable and maintainable.
Key ResponsibilitiesDesign 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
Job RequirementsMust Have
Strong backend engineering fundamentals with experience shipping production systems
Experience with PostgreSQL and practical database design
Experience building and operating API integrations (OAuth2, webhooks, retries, idempotency)
Strong understanding of system reliability, monitoring, and failure handling
Ability to work independently with high ownership and minimal supervision
Good to Have
Experience with billing systems, subscriptions, invoicing, or payments
Experience integrating accounting or CRM systems (e.g. Xero, HubSpot, Salesforce)
Experience with Supabase or managed Postgres / serverless environments
Experience building internal tools or admin dashboards
Startup or fast-growth company experience
Qualifications
Degree in Computer Science, Engineering, or related field (or equivalent practical experience)
Senior level preferred (5+ years of backend engineering experience); strong mid-level candidates may be considered
5000 - 8000 SGD
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