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Senior full-stack and AI platform engineer with 12+ years of experience delivering production software across AI analytics, data platforms, fintech, digital health, and e-commerce logistics. Designs data-intensive products end to end: React and Next.js interfaces, TypeScript and Node.js services, Python-based analytics and model workflows, real-time event processing, and cloud deployment. Brings direct experience with financial transaction systems, interactive analytics, time-series data, model evaluation, API integrations, observability, and clean service boundaries. Comfortable taking an early-stage platform from architecture and technical spikes through implementation, release, incident support, and iterative product delivery.…Senior full-stack and AI platform engineer with 12+ years of experience delivering production software across AI analytics, data platforms, fintech, digital health, and e-commerce logistics. Designs data-intensive products end to end: React and Next.js interfaces, TypeScript and Node.js services, Python-based analytics and model workflows, real-time event processing, and cloud deployment. Brings direct experience with financial transaction systems, interactive analytics, time-series data, model evaluation, API integrations, observability, and clean service boundaries. Comfortable taking an early-stage platform from architecture and technical spikes through implementation, release, incident support, and iterative product delivery.

Zachary Cai

Full Stack Developer, AI Engineer, Data Scientist, +2

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Senior full-stack and AI platform engineer with 12+ years of experience delivering production software across AI analytics, data platforms, fintech, digital health, and e-commerce logistics. Designs data-intensive products end to end: React and Next.js interfaces, TypeScript and Node.js services, Python-based analytics and model workflows, real-time event processing, and cloud deployment. Brings direct experience with financial transaction systems, interactive analytics, time-series data, model evaluation, API integrations, observability, and clean service boundaries. Comfortable taking an early-stage platform from architecture and technical spikes through implementation, release, incident support, and iterative product delivery.…Senior full-stack and AI platform engineer with 12+ years of experience delivering production software across AI analytics, data platforms, fintech, digital health, and e-commerce logistics. Designs data-intensive products end to end: React and Next.js interfaces, TypeScript and Node.js services, Python-based analytics and model workflows, real-time event processing, and cloud deployment. Brings direct experience with financial transaction systems, interactive analytics, time-series data, model evaluation, API integrations, observability, and clean service boundaries. Comfortable taking an early-stage platform from architecture and technical spikes through implementation, release, incident support, and iterative product delivery.

Available to hire

Senior full-stack and AI platform engineer with 12+ years of experience delivering production software across AI analytics, data platforms, fintech, digital health, and e-commerce logistics. Designs data-intensive products end to end: React and Next.js interfaces, TypeScript and Node.js services, Python-based analytics and model workflows, real-time event processing, and cloud deployment.

Brings direct experience with financial transaction systems, interactive analytics, time-series data, model evaluation, API integrations, observability, and clean service boundaries. Comfortable taking an early-stage platform from architecture and technical spikes through implementation, release, incident support, and iterative product delivery.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Language

English

Fluent

Work Experience

Senior Full Stack AI Platform Engineer at Relo Metrics

September 1, 2023 - May 1, 2026

Architected React and Next.js analytics workspaces combining interactive time-series views, comparison tools, filters, annotations, and model-confidence overlays for media and sponsorship measurement workflows. Built Python and FastAPI services for feature preparation, model inference, post-processing, and versioned prediction APIs with separation between analytical logic and customer-facing concerns. Designed event-driven ingestion and processing for high-volume measurement signals including schema validation, deduplication, late-arriving data handling, retry controls, and controlled reprocessing. Implemented historical replay and evaluation workflows to compare model versions across time ranges and support release decisions. Added explainability and human-review experiences for confidence, ambiguous predictions, and quality exceptions to analysts. Integrated model outputs with TypeScript services, scheduled jobs, webhooks, and reporting pipelines while preserving traceability. Contai

Senior Data Platform Engineer, Real-Time AI Analytics at Fiddler AI

February 1, 2022 - September 1, 2023

Designed Python and Go services to ingest prediction events, feature values, labels, model versions, and monitoring configuration from APIs, files, streams, and scheduled loads. Built Kafka-based processing paths for near-real-time model performance, drift, distribution, and alert calculations while preserving event time, tenant scope, and model identity. Defined time-series and analytical storage patterns with partitioning, indexing, precomputation, and workload-aware query design for responsive monitoring and explainability. Delivered React/TypeScript diagnostic interfaces connecting raw prediction events to trend charts, segmentation, threshold configuration, and investigation workflows. Implemented schema evolution, deduplication, replay, backfill, and reconciliation controls for recovery from incomplete or malformed data without corrupting historical analysis. Added tenant-scoped APIs for onboarding models, configuring monitoring, retrieving diagnostics, and integrating alerts wit

Full Stack Software Engineer, Financial Data & Payments at Finix

November 1, 2018 - February 1, 2022

Built React and TypeScript interfaces for transaction search, financial reporting, merchant configuration, exception review, and payment-status analysis across complex operational workflows. Developed Node.js services and REST APIs for payment authorization, capture, refunds, settlements, disputes, and payouts with consistent validation, pagination, versioning, and error contracts. Implemented event-driven payment processing with durable queues, idempotency keys, retries, dead-letter handling, ordering controls, and reconciliation for transaction-sensitive operations. Delivered near-real-time status updates and operational dashboards by connecting payment events, partner responses, and database records without exposing inconsistent intermediate states. Integrated payment processors, banking partners, merchant systems, and internal services through APIs, webhooks, files, and asynchronous workflows with clear diagnostics for partner failures. Strengthened sensitive-data handling via role

Software Engineer, Secure Digital Health Workflows at Lemonaid Health

August 1, 2016 - November 1, 2018

Built responsive patient and provider applications for intake, review, scheduling, care coordination, status tracking, and follow-up workflows using reusable web components and clear state transitions. Designed backend APIs for patient profiles, intake data, provider queues, notifications, and operational reporting with validation for incomplete and exception-driven cases. Implemented asynchronous notifications and background processing with retries, deduplication, failure handling, and support diagnostics for time-sensitive care workflows. Added role-aware access, audit events, protected configuration, and privacy-aware logging for sensitive healthcare information. Improved mobile usability, accessibility, loading behavior, validation messages, and error recovery across long-form patient journeys and provider review queues. Created automated tests for critical patient and provider paths and diagnosed production issues involving access, workflow state, notifications, and third-party in

Full Stack Developer, Shipping APIs & Real-Time Integrations at Shippo

June 1, 2013 - August 1, 2016

Built full-stack shipping capabilities for carrier connections, rate retrieval, label purchase, tracking, returns, account configuration, and customer support workflows. Integrated carrier and commerce systems through REST APIs, webhooks, scheduled jobs, files, and asynchronous processing while normalizing authentication, service levels, status events, and error models. Designed backend services for shipping transactions and tracking updates with validation, idempotency, timeouts, rate limiting, retries, and reconciliation for external-system variability. Developed customer dashboards with search, filtering, progress states, shipment history, tracking timelines, billing details, and actionable failure messages. Improved reliability during traffic spikes using caching, queueing, backpressure, controlled concurrency, and operational visibility into failed labels, delayed tracking, and webhook delivery. Added API, adapter, webhook, and end-to-end tests; supported production releases and d