{"canonicalUrl":"https://humetric.net/p/profile-f6802e852527472197d1b841d145505d","profileVersion":"8ee443f0-2565-4acf-8fb9-176d7b9074f9","lastUpdated":"2026-10-03T22:25:06.466679+00:00","profile":{"display_name":"Rayer Tung","last_updated":"2026-10-03","slug":"profile-d41832adc54b491c","headline":"AI-Native Staff Backend & Platform Engineer","summary":"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.","years_experience":19,"skills":["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"],"experiences":[{"id":"4749441a-0e08-4b55-8327-c8b6632b8858","person_id":"b4c5522f-b2b8-475d-a181-1a911158d4a5","title":"Section Manager, Fab Production Platform","company":"TSMC","start_date":"Aug 2024","end_date":"May 2026","description":"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.","position":0},{"id":"0704abae-aaa8-4edf-[contact removed]fc2789","person_id":"b4c5522f-b2b8-475d-a181-1a911158d4a5","title":"Technical Consultant, Fixed-Term Engagement","company":"Fusang","start_date":"Feb 2024","end_date":"Jul 2024","description":"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.","position":1},{"id":"9bb65154-b400-425b-b75b-be314466f90e","person_id":"b4c5522f-b2b8-475d-a181-1a911158d4a5","title":"Staff Software Engineer","company":"Binance","start_date":"Jul 2022","end_date":"Jan 2024","description":"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.","position":2},{"id":"0b76d5d8-f277-4e83-90d5-cd7092b508e0","person_id":"b4c5522f-b2b8-475d-a181-1a911158d4a5","title":"Senior Software Engineer — MLOps","company":"Appier","start_date":"Feb 2021","end_date":"Jul 2022","description":"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.","position":3},{"id":"bb365c1e-ceec-434d-96db-3be6c8050fd9","person_id":"b4c5522f-b2b8-475d-a181-1a911158d4a5","title":"Senior Software Engineer / Technical Lead, MCDS","company":"Innova Solutions USA","start_date":"Jul 2017","end_date":"Feb 2021","description":"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.","position":4},{"id":"4a182b5c-e4c6-4999-9e94-fa47de56313d","person_id":"b4c5522f-b2b8-475d-a181-1a911158d4a5","title":"Senior Software Engineer","company":"Ruckus Wireless","start_date":"Oct 2012","end_date":"Jun 2017","description":"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.","position":5},{"id":"b5060a3f-[contact removed]-ae6f-6445f163b957","person_id":"b4c5522f-b2b8-475d-a181-1a911158d4a5","title":"Android and OpenID Development; HamiBook E-book Platform and DRM Pipeline; MMORPG Client and Server Engineering","company":"Wozai Info Tech / Spring House (CHT Subsidiary) / Gamania","start_date":"Jul 2007","end_date":"Sep 2012","description":"Worked on Android and OpenID development, the HamiBook e-book platform and DRM pipeline, and MMORPG client and server engineering.","position":6}],"educations":[{"id":"296c7b27-078c-43d8-b07f-c653d0b7c88c","person_id":"b4c5522f-b2b8-475d-a181-1a911158d4a5","school":"National Chung Hsing University","degree":"Studies","field":"Food Science","start_year":null,"end_year":null}],"projects":[{"id":"e3800f[contact removed]e-90565aed4bb2","person_id":"b4c5522f-b2b8-475d-a181-1a911158d4a5","name":"LLM Wiki Cloud","description":"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.","url":"https://wiki.rayer.idv.tw/","technologies":["LLM","RAG","Markdown","Multi-Tenant Systems","Retrieval","BYOK"],"position":0},{"id":"eb1d94ee-78b1-4dca-b0f7-e60a228d2782","person_id":"b4c5522f-b2b8-475d-a181-1a911158d4a5","name":"MapSwitch","description":"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.","url":"https://apps.apple.com/tw/app/mapswitch/id6762086578","technologies":["macOS","Safari Extension","Google Maps","OpenStreetMap","Apple Maps"],"position":1}]},"chunksVersion":"profile-chunks-v4","approvedDiscoveryQueries":["AI-Native Staff Backend & Platform Engineer","Go Java Rust"],"evidence":[{"id":"identity:0","type":"identity","ordinal":0,"locale":"en","text":"Rayer Tung. AI-Native Staff Backend & Platform Engineer. 19 years experience","fieldKeys":["display_name","headline","years_experience"]},{"id":"summary:0","type":"summary","ordinal":0,"locale":"en","text":"Rayer Tung. AI-Native Staff Backend & Platform Engineer. Summary / 簡介: 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.","fieldKeys":["summary"]},{"id":"skills:0","type":"skills","ordinal":0,"locale":"en","text":"Rayer Tung. AI-Native Staff Backend & Platform Engineer. Skills / 技能: 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","fieldKeys":["skills"]},{"id":"discovery:0","type":"discovery","ordinal":0,"locale":"en","text":"Rayer Tung. AI-Native Staff Backend & Platform Engineer. Role / 職稱: AI-Native Staff Backend & Platform Engineer. Experience / 年資: 19 years experience. Expertise / 專長: A/B Testing, API Design, Argo CD, AWS, AWS Lambda, Azure DevOps, BigQuery, C++, Cassandra, CloudFormation, CloudWatch, CORBA","fieldKeys":["display_name","headline","years_experience","skills"]},{"id":"experience:0","type":"experience","ordinal":0,"locale":"en","text":"Rayer Tung. AI-Native Staff Backend & Platform Engineer. Experience / 經歷: Section Manager, Fab Production Platform at TSMC. Aug 2024 to May 2026. 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.","fieldKeys":["experiences"]},{"id":"experience:1","type":"experience","ordinal":1,"locale":"en","text":"Rayer Tung. AI-Native Staff Backend & Platform Engineer. Experience / 經歷: Technical Consultant, Fixed-Term Engagement at Fusang. Feb 2024 to Jul 2024. 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.","fieldKeys":["experiences"]},{"id":"experience:2","type":"experience","ordinal":2,"locale":"en","text":"Rayer Tung. AI-Native Staff Backend & Platform Engineer. Experience / 經歷: Staff Software Engineer at Binance. Jul 2022 to Jan 2024. 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.","fieldKeys":["experiences"]},{"id":"experience:3","type":"experience","ordinal":3,"locale":"en","text":"Rayer Tung. AI-Native Staff Backend & Platform Engineer. Experience / 經歷: Senior Software Engineer — MLOps at Appier. Feb 2021 to Jul 2022. 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.","fieldKeys":["experiences"]},{"id":"experience:4","type":"experience","ordinal":4,"locale":"en","text":"Rayer Tung. AI-Native Staff Backend & Platform Engineer. Experience / 經歷: Senior Software Engineer / Technical Lead, MCDS at Innova Solutions USA. Jul 2017 to Feb 2021. 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.","fieldKeys":["experiences"]},{"id":"experience:5","type":"experience","ordinal":5,"locale":"en","text":"Rayer Tung. AI-Native Staff Backend & Platform Engineer. Experience / 經歷: Senior Software Engineer at Ruckus Wireless. Oct 2012 to Jun 2017. 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.","fieldKeys":["experiences"]},{"id":"experience:6","type":"experience","ordinal":6,"locale":"en","text":"Rayer Tung. AI-Native Staff Backend & Platform Engineer. Experience / 經歷: Android and OpenID Development; HamiBook E-book Platform and DRM Pipeline; MMORPG Client and Server Engineering at Wozai Info Tech / Spring House (CHT Subsidiary) / Gamania. Jul 2007 to Sep 2012. Worked on Android and OpenID development, the HamiBook e-book platform and DRM pipeline, and MMORPG client and server engineering.","fieldKeys":["experiences"]},{"id":"education:0","type":"education","ordinal":0,"locale":"en","text":"Rayer Tung. AI-Native Staff Backend & Platform Engineer. Education / 學歷: Studies. Food Science. National Chung Hsing University","fieldKeys":["educations"]},{"id":"project:0","type":"project","ordinal":0,"locale":"en","text":"Rayer Tung. AI-Native Staff Backend & Platform Engineer. Project / 專案: LLM Wiki Cloud. Built with / 使用技術: 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.","fieldKeys":["projects"]},{"id":"project:1","type":"project","ordinal":1,"locale":"en","text":"Rayer Tung. AI-Native Staff Backend & Platform Engineer. Project / 專案: MapSwitch. Built with / 使用技術: 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.","fieldKeys":["projects"]},{"id":"discovery:1","type":"discovery","ordinal":1,"locale":"en","text":"Rayer Tung. AI-Native Staff Backend & Platform Engineer. Approved discovery query / 核准搜尋語句: AI-Native Staff Backend & Platform Engineer","fieldKeys":["display_name","headline","desired_queries"]},{"id":"discovery:2","type":"discovery","ordinal":2,"locale":"en","text":"Rayer Tung. AI-Native Staff Backend & Platform Engineer. Approved discovery query / 核准搜尋語句: Go Java Rust","fieldKeys":["display_name","headline","desired_queries"]}]}