Eric Liu

• Led cross-team technical delivery for major initiatives from requirements and technical design through design reviews, Jira task decomposition, QA/release planning, migrations, and production support; represented the backend squad, coordinated work across teams, supported on-call and customer issue resolution, and ran knowledge-sharing sessions on new engineering standards.
• Designed and built ByteHouse’s production account and identity service in Go, covering multi-tenant onboarding, organization and user lifecycle, JWT sessions, API-key lifecycle, email verification, regional routing, gateway authentication, and control-plane authorization across backend services.
• Architected first-party usage-based billing for direct SaaS customers: calculated compute and storage usage from telemetry, generated monthly tax invoices, integrated Stripe tokenization and idempotent payment collection/reconciliation, and automated dunning, suspension, and offboarding.
• Built AWS Marketplace subscription, provisioning, and metering flows using SNS/SQS; during multi-region expansion, diagnosed a competing-consumer failure in the shared queue and redesigned event routing around region-specific queues. Implemented corresponding Volcano Engine integrations for prepaid/postpaid entitlements, metering, lifecycle webhooks, and API-gateway translation across three regions on each cloud.
• Took ownership of ByteHouse observability after the dedicated SRE team was reassigned and redesigned an internal-only telemetry stack into a tenant-aware capability for customers and developers; enhanced service metrics, defined customer-facing performance and lifecycle signals, exported telemetry to Volcano Engine Cloud Monitor and AWS CloudWatch, and built Grafana dashboards and alerts on the same data.
• Served as the sole backend engineer on an early ByteHouse commercialization effort that adapted ByteDance’s internal OLAP platform for external customer deployment; built its account and authentication system from scratch and integrated session handling across existing Python Flask and Java/Zuul gateways.

Skills used

Go · Distributed Systems · Microservices · Amazon Web Services · Systems Design · Software Observability · SaaS Development · Identity and Access Management · Billing Systems · REST APIs · Amazon SQS · Payment Gateways · Stripe · Grafana · VictoriaMetrics · InfluxDB · Kubernetes · JSON Web Token · Java · Python

Links

• Developed and maintained API gateway services routing requests across backend microservices and client-facing applications.
• Built backend services for MVNO customer onboarding, plan customization, account preferences, and internal customer-service workflows.
• Implemented RabbitMQ-based asynchronous adapters integrating backend systems with external telecommunications and network providers.
• Contributed to backend integrations supporting expansion into Australia and Taiwan.

Skills used

Go · Microservices · REST APIs · API Gateways · Event-Driven Architecture · MySQL · Node.js · RabbitMQ · MongoDB

Links

• Implemented credit-card and digital-wallet integrations with MiGS, CyberSource, Braintree, and WeChat Pay, adapting payment flows to market-specific requirements.
• Developed Java backend services and REST APIs for mobile ordering and payment workflows.
• Maintained multiple generations of production McDelivery systems and supported market-specific releases.
• Coordinated integrations and production troubleshooting with McDonald’s stakeholders and external payment providers.
• Introduced more structured Git workflows to improve team development and release practices.

Skills used

REST APIs · Payment Gateways · Java · Microsoft SQL Server · jQuery

Links

• Developed PHP backend tools and Android features for the Playphone Game Store and internal content-management workflows.
• Integrated AppsFlyer, Mixpanel, and Amplitude, instrumenting backend and client events for product and campaign measurement.
• Implemented Facebook campaign tracking for Android apps distributed outside Google Play, working around limitations in the standard advertising integration flow.
• Supported game developers globally with platform integrations and contributed to user testing and product feedback.

Skills used

REST APIs · Java · PHP

Links

Skills used

Microsoft SQL Server · ASP.NET

• Developed rocket-engine test firmware integrating pressure and temperature sensors, load cells, solenoid valves and servomotors, together with mission-control software for monitoring, telemetry and control.
• Designed and assembled electrical systems and participated in mission control during 10+ hybrid rocket-engine static firing tests.
• Contributed to early company development, including securing NUS Enterprise support, assisting with engineering and business operations, and handling media relations such as press releases and interviews.

Links

• Graduation project: built a PHP-based web application for the School of Informatics and Information Technology administration staff to track graduates’ career advancement.
• Participated in the Microsoft Student Partners program, engaging with Microsoft technologies and student developer activities.