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An AI-native staff backend and platform engineer with experience building high-scale distributed systems, developer platforms, migration automation, and source-grounded LLM knowledge products. Has operated systems at 20,000–60,000 QPS, delivered platforms adopted across multiple business units, and led hands-on architecture, implementation, rollout, reliability, and cloud cost optimization.
Skills
Experience
Section Manager, Fab Production Platform — TSMC
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Architected and engineered business-critical fab production systems from a shared Java/Go codebase across 60+ fab phases; reviewed critical changes and handled production incidents. Architected, implemented, and deployed a Java/Spring compatibility platform that continuously parsed evolving CORBA IDLs, converted nearly 1,000 operations across two major service domains into HTTP endpoints, and generated Springdoc OpenAPI specs plus Go/Java SDKs. The platform removed consumer-side IONA Orbix dependency while retaining CORBA behind a stable boundary and created a single future cutover point for a planned replacement broker/gRPC migration; this production-standard integration path was adopted by three internal teams. Built an automated CentOS end-of-support migration platform for 1,400+ VMs to Ubuntu replacements across 6–12-node production groups, preserving exact WAR/application versions, configuration, and network/load-balancer behavior through rolling traffic shifts. Implemented the pipeline with Azure DevOps SDK/API orchestration, Python reconciliation, and PExpect; built and piloted it in four weeks. Reduced a 6–7-node group migration from two engineer-days to 1–2 largely unattended hours, with >99% success on the first automated run and automatic retries for transient provisioning failures. Led a department-selected AI knowledge proof of concept that compiled fragmented, long-lived domain documentation into concept-oriented LLM Wiki entries after fragment-level RAG failed to provide coherent system overviews.
Technical Consultant, Fixed-Term Engagement — Fusang
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Developed a Go digital-asset clearing engine covering matching, balance, settlement instructions, on-chain settlement, and reconciliation; delivered it through UAT during the fixed-term engagement and it subsequently entered production after the engagement.
Staff Software Engineer — Binance
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Owned the RFC, API contract, server integration layer, and Go/Java/Rust SDKs that exposed Themis’s existing experiment lifecycle through programmable platform contracts, transforming a web-only A/B testing tool and replacing brittle UI-version-dependent Selenium integrations. The platform was adopted by 7+ business units. Designed policy-bearing SDK behavior beyond wrappers, including consumer-side prefiltering, local fallback, coordinated client/server caching, event routing, and pluggable metrics. Replaced a manual PM-operated KYC workflow with end-to-end SDK automation. Led requirement discovery, customer surveys, documentation, and onboarding. Supported the platform's latency-sensitive decision path at approximately 40,000 QPS while driving API/SDK integration across business units.
Senior Software Engineer — MLOps — Appier
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Owned the Dynamic Native Advertisement online recommendation, creative-assembly, and tracking platform at 20,000–60,000 QPS, around 100 ms P90, across the US and Asia. Re-architected the Python/AWS Lambda serving path as Go services on GKE for a stable baseline plus 10–20x campaign traffic spikes; tuned KEDA autoscaling and gradual Route 53 canary traffic shifts, reaching comparable SLA and tail latency after stabilization. Partnered as the first production adopter for Infra’s CloudWatch-to-self-hosted-ELK implementation. Billing tags captured all product-attributed AWS/GCP costs before and after; comparable traffic/ad-budget periods showed an estimated 65% reduction in product-attributed cloud costs.
Senior Software Engineer / Technical Lead, MCDS — Innova Solutions USA
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Directly implemented a Java HIPAA de-identification pipeline and representative test-data generation; established the project’s first Jenkins CI pipeline. Co-designed and implemented the incremental migration of a company-hosted shared multi-tenant monolith into a shared AWS platform serving 50+ customers. Contributed the production transaction proxy, distributed locks, and explicit state machines for plugin-driven workflows across imperfect service boundaries; compensating actions restored prior state after partial failures.
Senior Software Engineer — Ruckus Wireless
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Primary IC and technical-spec author for a four-node controller platform formally rated to manage 30,000 APs, with production customers near the limit. Designed and implemented AP placement, overload redirection, failover, and rebalancing; remediated connection backlog and timeout issues found in scale certification. Partnered with PM and QA to define capacity/failover acceptance. QA executed 30K virtual-AP tests; analyzed results and contributed controller-aware test-harness integration. Owned public API/backward compatibility and releases for customer and internal integrations; modernized controller capabilities from C/C++ to Java using JNI where needed.
Android and OpenID Development; HamiBook E-book Platform and DRM Pipeline; MMORPG Client and Server Engineering — Wozai Info Tech / Spring House (CHT Subsidiary) / Gamania
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Worked on Android and OpenID development, the HamiBook e-book platform and DRM pipeline, and MMORPG client and server engineering.
Featured projects
LLM · RAG · Markdown · Multi-Tenant Systems · Retrieval · BYOK
AI Knowledge Workspace that turns Markdown files and web sources into structured, searchable, source-linked knowledge for grounded AI-assisted work. Shipped multi-tenant BYOK, ingest/compile/publish, tenant isolation, retrieval, and source traceability.
macOS · Safari Extension · Google Maps · OpenStreetMap · Apple Maps
A 2.6 MB privacy-focused macOS Safari extension for opening locations in Google Maps, OpenStreetMap, or Apple Maps. The App Store reports no data collection.
Education
National Chung Hsing University — Studies, Food Science
Rayer Tung lists A/B Testing, API Design, Argo CD, AWS, AWS Lambda, Azure DevOps, BigQuery, C++, Cassandra, CloudFormation, CloudWatch, CORBA, Digital Asset Settlement, Distributed Systems, Docker, DynamoDB, ELK, GCP, GKE, Go, Grafana, Helm, Java, Jenkins, JNI, Kafka, KEDA, Kubernetes, LLM, Microservices, Migration Automation, MLOps, Multi-Tenant Systems, NoSQL, OpenAPI, PExpect, Platform Engineering, Prometheus, Python, RAG, REST, Route 53, Rust, SDK Development, Spring Boot, SQL as professional skills.
Rayer Tung has experience in Section Manager, Fab Production Platform, Technical Consultant, Fixed-Term Engagement, Staff Software Engineer, Senior Software Engineer — MLOps, Senior Software Engineer / Technical Lead, MCDS, Senior Software Engineer, Android and OpenID Development; HamiBook E-book Platform and DRM Pipeline; MMORPG Client and Server Engineering across organizations including TSMC, Fusang, Binance, Appier, Innova Solutions USA, Ruckus Wireless, Wozai Info Tech / Spring House (CHT Subsidiary) / Gamania.
Rayer Tung is AI-Native Staff Backend & Platform Engineer, 19 years of experience, with expertise in A/B Testing, API Design, Argo CD, AWS, AWS Lambda, Azure DevOps, BigQuery, C++, Cassandra, CloudFormation, CloudWatch, CORBA.
Relevant searches: AI-Native Staff Backend & Platform Engineer · Go Java Rust
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