Smati Tungkitkancharoen

Staff Software Engineer at Hopper

San Francisco, California, United States

About

Staff Software Engineer with 10+ years leading scalable platforms across fintech, identity, and data systems. At Hopper, I own platform architecture for multi-tenant purchase orchestration, partner API contracts, and cross-team reliability across partner-integrated flows. Previously at Amazon, I led high-scale authentication and automation initiatives, including a kiosk login platform used across 110+ fulfillment centers (50K+ daily logins) and workflow automation that reduced support volume by 92%. I drive cross-team alignment through RFCs and technical leadership, and mentor engineers on reliability and execution.

Experience

  • Staff Software Engineer at Hopper
    Jun 2025 - Present · 1 yr 1 mo

    - Designed cross-domain orders orchestrator with two-phase commit, cutting integration effort by 60%. - Authored 5+ RFCs aligning product, payments, and platform teams on order atomicity and partner API design. - Owned partner-facing APIs and contracts with versioned compatibility, reducing onboarding from 6 weeks to 2 weeks. - Defined canonical order lifecycle with idempotency keys and state machine, cutting duplicate/failed purchases by 45%. - Standardized tracing and SLOs across services, enabling one-click root cause and cutting MTTR by 30%. - Enabled safe partner rollouts via config guardrails and staged releases, reducing rollout risk by 70%. - Built tenant policy filtering with explainable reasons, cutting escalations by 30% and boosting conversion by 1.5pp. - Defined Exercise Portal backend boundary (portal vs API-only partners) with internal service contracts + OTP/verification integration, reducing manual exercise handling by 60%.

  • Software Engineer at Amazon
    Sep 2020 - Jun 2025 · 4 yrs 10 mos

    - Led kiosk auth rollout to 110 centers, serving 50K logins/day with secure badge authentication. - Built new AtoZ features for 2M employees, streamlining PTO, pay, and daily tasks on web/mobile. - Fortified AtoZ login flow, cutting credential breaches by 85% and enhancing Android security. - Drove zero-downtime OS patching across p0 systems, safeguarding 24/7 availability. - Built ETL flows tracking 500K events/day, powering BI insights for diverse org stakeholders. - Bridged Identity, BI, and Data Eng teams, unblocking roadmaps and boosting delivery speed by 40%. - Removed bulky packages, lifting dev throughput by 50% and cutting build times by 70%. - Spearheaded JSP-to-React migration, slashing deploy times from 90 mins to under 10 mins. - Re-architected BI pipeline, dropping Sev2 incidents from 5/week to zero and enabling schema-flexible data ingestion. - Shifted legacy messaging to AWS Pinpoint, reducing ops incidents by 80% via modernized tooling. - Achieved 99.99% uptime by regionalizing core services, cutting downtime to under 9s/day. - Delivered Alumni portal for ex-staff, securing HR data and supporting 20K daily lookups. - Mentored 10+ junior devs, elevating code quality and accelerating feature delivery by 30%. - Built ticket automation, cutting 350 monthly support tickets by 92% and slashing backlog cycles. - Deployed script‑detection, curbing 5K exploiters to under 100, restoring fair VET/VTO access.

  • Founder & Developer at Crawling Ninja
    Feb 2016 - Sep 2020 · 4 yrs 8 mos

    - Built 20+ high-scale Scrapy crawlers, capturing competitor data 3x faster for diverse clients. - Drove in-depth market analyses, guiding clients to boost conversion by an estimated 30%. - Advised firms on pipeline automation, slashing manual workflows by 70% via custom tooling. - Coached team on algorithms and frameworks, elevating delivery speed and code maintainability. - Overhauled full-stack design, reducing load times by 60% and improving UI responsiveness. - Built partner‑search algorithms, netting a 45% rise in warm leads for B2B expansions.

  • Software Engineer at Checkr, Inc.
    Mar 2019 - Aug 2020 · 1 yr 6 mos

    - Created ML-ready auditing dashboards, boosting data labeling speed by 50% for background checks. - Onboarded 10+ vendors into Ruby microservices via gRPC/Kafka for seamless data flow. - Split monolith into 12 microservices, halving deployment risks and easing feature rollouts. - Led 90+ interviews in 12 months, securing 40% offers accepted and speeding new-hire ramp.

  • Full Stack Engineer (Tech Lead) at Stanza
    May 2018 - Mar 2019 · 11 mos

    - Led 5‑engineer squad on revenue pipeline, processing 500K events/week with real-time tracking. - Deployed Elasticsearch backend, powering ~375K daily queries for instant event discovery. - Built ads, dashboards, and mobile‑friendly UIs (Angular/React), raising engagement by 35%. - Established Airflow base, accelerating ETL jobs by 40% and automating complex workflows. - Optimized Golang/Python jobs, halving batch runtimes and bolstering data accuracy. - Shifted critical flows to AWS Lambda, cutting infra costs by 30% and easing maintenance. - Developed periodic scrapers, syncing 200K+ records monthly for real‑time event coverage. - Delivered fresh Node endpoints, unlocking new features and enabling 20% faster integrations.