Senior Full-Stack Engineer (React, Node, Cloud)

Bernie Smith

Senior Full-Stack Software Engineer

Newark, NJ • 707-***-**** • **************@*****.***

• https://www.linkedin.com/in/bernie-smith-b345b77b SUMMARY

Senior Full-Stack Software Engineer with 15 years of experience delivering end-to-end user-facing and backend systems across consumer technology, cloud identity platforms, mobility, and enterprise consulting. Proven expertise building high-performance React/TypeScript frontends paired with scalable backend services in Node.js, .NET, Java, and Python. Experienced owning products from UI architecture and UX performance through API design, distributed systems, and cloud-native infrastructure on AWS, Azure, and Kubernetes. Strong track record optimizing frontend responsiveness, backend reliability, and operating production services with SLO/SLA ownership while mentoring engineers in Agile teams. PROFESSIONAL SKILLS

Frontend & UI Engineering:

• React, Next.js, Angular, AngularJS

• TypeScript, JavaScript (ES6+)

• HTML5, CSS3, Responsive Design

• Client-Side Performance Optimization

• Component Architecture & Reusable UI

Systems

Cloud, DevOps & Systems:

• AWS, Azure, Kubernetes, Docker

• CI/CD, Terraform, Helm, GitOps

• Kafka, Redis

• PostgreSQL, MySQL, MongoDB

Backend & API Engineering:

• Node.js, Python (Django, Flask, FastAPI)

• Java (Spring Boot), C#, ASP.NET Core, .NET

Core

• Ruby on Rails

• REST APIs, GraphQL

• Microservices, Event-Driven Architecture

Quality, Delivery & Observability:

• Agile/Scrum, TDD, Code Reviews

• System Design & Architecture

• Prometheus, Grafana, Datadog, PagerDuty

• Performance Optimization & Reliability

PROFESSIONAL EXPERIENCE

Apple

Senior Software Engineer Jul 2022 – Present

• Architected high-throughput backend services and API contracts supporting iCloud storage and sync infrastructure serving 100M+ active users across 175 countries, processing 2.5B daily device sync operations with sub-500ms latency.

• Built event-driven microservices using Java (Spring Boot) and Python handling 1B+ daily events (photo uploads, document changes, app data sync) with exactly-once delivery guarantees and zero data loss.

• Designed real-time conflict resolution for concurrent edits across devices using vector clocks and operational transformation, reducing sync conflicts by 67% and improving experience consistency.

• Implemented Kafka streaming data pipelines processing 800TB/day telemetry, slashing analytics latency from 6 hours to 8 minutes (45% improvement) and enabling near real-time product insights.

• Led migration of 22 legacy monolithic services to Kubernetes on AWS with Helm charts and GitOps workflows, improving deployment frequency from bi-weekly to daily (60% increase) and reducing production incidents by 30%.

• Designed and implemented React + TypeScript frontend experiences for internal and partner-facing dashboards, enabling engineers and product teams to visualize real-time iCloud sync health, storage usage, and latency metrics across regions.

• Built highly reusable frontend component libraries aligned with internal design standards, improving UI consistency and reducing new feature delivery time by 30%.

• Optimized frontend rendering performance through memoization, code-splitting, and API response shaping, improving initial load times by 40% for large datasets.

• Collaborated closely with product designers to translate complex backend workflows into intuitive, user- friendly interfaces used daily by hundreds of internal stakeholders.

• Partnered with backend teams to define API contracts optimized for frontend consumption, reducing over-fetching and improving perceived UI responsiveness.

• Built resilient retry and circuit breaker patterns (resilience4j), preventing cascading failures during regional AWS outages and maintaining availability during 3 major infrastructure incidents.

• Developed internal REST APIs using TypeScript/Node.js for App Store Connect analytics enabling 200K+ developers to track downloads, revenue, and engagement across 40M apps.

• Optimized iCloud backup restoration through intelligent caching with Redis and PostgreSQL query tuning, achieving 35% reduction in restore time (12 minutes 7.8 minutes).

• Implemented distributed rate limiting using Redis + Lua protecting backend services from traffic spikes, successfully handling 10x normal load during iPhone launch events without degradation.

• Collaborated with Security and Privacy teams implementing end-to-end encryption, federated authentication flows, and comprehensive audit logging meeting GDPR/CCPA requirements.

• Built automated performance benchmarking using JMeter and Python scripts, running 500+ nightly scenarios and catching regressions before production deployment.

• Created real-time monitoring dashboards using Prometheus/Grafana tracking 200+ service health metrics, with PagerDuty integration reducing alert fatigue by 45%.

• Mentored 5 junior engineers via design reviews, pair programming, and architecture workshops, with 4 promoted to mid-level within 18 months.

• Participated in on-call rotation supporting critical infrastructure maintaining 99.99% uptime SLA, resolving 12 high-severity incidents with 23-minute average time-to-resolution.

• Leveraged AWS services (EC2, S3, RDS, Lambda, CloudWatch) to support scalable, highly available iCloud backend infrastructure across global regions.

Tech Stack: React, TypeScript, JavaScript, Node.js, Java (Spring Boot), Python, REST APIs, Kafka, Redis, PostgreSQL, AWS (EC2, S3, RDS, Lambda, CloudWatch), Kubernetes, Docker, Helm, GitOps, CI/CD, Prometheus, Grafana, PagerDuty

Microsoft

Senior Software Engineer Sep 2020 – Jul 2022

• Developed scalable backend services and admin experiences for Azure Active Directory supporting 500M+ enterprise users across 250K organizations, handling 15B authentication requests daily.

• Built RESTful APIs using C# / ASP.NET Core / .NET Core for MFA, conditional access policies, and identity governance workflows, improving authentication success from 94.2% 98.7% (40% error reduction).

• Architected cloud-native microservices on Azure leveraging Functions, Service Bus, and Cosmos DB, achieving 99.95% availability.

• Designed token validation and rotation service processing 800M OAuth2/OIDC tokens/day with sub-50ms latency, implementing caching strategies reducing directory calls by 73%.

• Built a TypeScript/React admin portal enabling IT administrators to manage 50M+ identities, configure security policies, and investigate suspicious sign-in activity across tenants.

• Served as full-stack owner for multiple Azure AD admin features, driving requirements from UX design through React implementation and backend API delivery.

• Led frontend architecture decisions for the TypeScript/React admin portal, focusing on scalability, maintainability, and secure multi-tenant UI patterns.

• Improved frontend performance and usability for large enterprise tenants by optimizing state management, API pagination, and client-side caching, cutting page interaction latency by 35%.

• Worked directly with design and PM teams to iterate on accessibility, usability, and admin workflows, improving administrator task completion rates.

• Implemented threat detection analyzing login patterns with ML models, identifying and blocking 2.3M potentially compromised accounts monthly while maintaining 0.8% false positive rate.

• Led performance optimization reducing SQL Server query times by 50% (indexing, query rewrites, read replicas), improving dashboard load times from 8s 4s.

• Developed automated provisioning pipeline syncing Active Directory with 40+ SaaS applications using SCIM, reducing manual account setup time from 45 minutes 2 minutes.

• Established CI/CD pipelines using Azure DevOps with automated testing (95% code coverage), security scanning, and progressive rollouts across 8 global regions, reducing manual effort by 70%.

• Built real-time compliance reporting/audit logging aligned to SOC 2 / ISO 27001 / FedRAMP, processing 200M daily audit events with 7-year retention.

• Collaborated across Redmond, Dublin, and Hyderabad in Agile delivery, shipping 18 major features across 6 quarterly release cycles.

• Authored API specs, architecture decision records, and troubleshooting guides adopted as standard reference by 120+ engineers.

Tech Stack: C#, ASP.NET Core, .NET Core, React, TypeScript, JavaScript, REST APIs, OAuth2, OpenID Connect

(OIDC), SCIM, Azure Functions, Azure Service Bus, Cosmos DB, SQL Server, Azure DevOps, CI/CD Uber Eats

Software Engineer II (L4) Mar 2016 – Sep 2020

• Built and maintained backend services powering the Uber Eats marketplace across 45 countries processing 12M daily orders at peak, generating $26B annual gross bookings during tenure.

• Developed order lifecycle management APIs using Java and Python handling order placement, restaurant acceptance, driver assignment, and delivery completion with complex state machine orchestration and idempotency guarantees.

• Architected payment processing service integrating with 25 payment providers (Stripe, Braintree, local methods) supporting 15 currencies, processing $2B/month with 99.98% success rate.

• Built restaurant onboarding platform streamlining partner integration from 3 weeks 2 days, enabling 180K+ restaurants and increasing selection by 240%.

• Owned full-stack delivery of merchant-facing features, implementing React-based dashboards tightly integrated with real-time backend order and dispatch systems.

• Built frontend data visualizations and operational tooling enabling restaurants to track order status, demand trends, and performance metrics in real time.

• Collaborated with designers to refine merchant UX flows, reducing onboarding friction and support inquiries through improved UI clarity and feedback loops.

• Balanced frontend iteration speed with backend correctness, ensuring consistent behavior across web, mobile, and API-driven surfaces.

• Contributed to real-time dispatch optimization integrating graph algorithms and ML models, improving matching efficiency by 20% and reducing average delivery time by 4.2 minutes.

• Designed dynamic pricing engine using predictive models (distance, demand, traffic, weather), optimizing marketplace economics and increasing driver utilization by 18%.

• Implemented frontend features using React/JavaScript for merchant dashboard enabling menu management, real-time order tracking, and analytics, reducing support tickets by 30%.

• Modernized Ruby-based legacy order tracking service by migrating to Java microservices with 85%+ test coverage, improving reliability 97.2% 99.6% uptime and reducing latency by 52%.

• Optimized MySQL performance through query analysis, index optimization, and connection pooling, reducing peak DB latency 40% (850ms 510ms) and eliminating timeout errors.

• Built fraud detection rules engine identifying $4.8M in fraudulent transactions monthly while maintaining 3.2% false positive rate.

• Collaborated with data science teams integrating predictive ML models for ETA, demand forecasting, and recommendations (ETA accuracy 68% 84%).

• Implemented distributed caching layer using Redis reducing API calls by 65% during peak traffic, handling 350% spike load (Super Bowl Sunday).

• Developed A/B experimentation framework enabling 40+ experiments that improved browse-to-checkout conversion by 23%.

• Participated in incident response and blameless postmortems for 15 major outages, reducing P0 incidents from 8/quarter 2/quarter.

• Established monitoring and alerting using Datadog tracking 150+ KPIs, reducing on-call noise by 38%. Tech Stack: React, JavaScript, Java, Python, REST APIs, AWS, MySQL, Redis, Stripe, Braintree, Microservices, Distributed Systems, Datadog

Deloitte

Software Engineer Mar 2011 – Mar 2016

• Delivered enterprise software solutions for Fortune 500 clients across finance, healthcare, and retail sectors, supporting mission-critical business operations for organizations with 50K+ employees.

• Developed full-stack claims adjudication platform for major healthcare insurer using Java + Spring processing 1.8M claims/year worth $3.2B, reducing manual review time by 45%.

• Built mortgage loan origination system using C# / .NET MVC supporting $800M annual loan volume, reducing loan approval time from 21 days 12 days.

• Delivered full-stack enterprise applications, building server-rendered and client-side UI layers integrated with complex backend workflows.

• Worked closely with non-technical stakeholders to translate business requirements into clear user interfaces backed by reliable APIs.

• Developed reusable frontend components for internal enterprise portals, accelerating delivery across multiple client engagements.

• Designed data processing ETL pipelines in Python across 12 source systems into SQL Server warehouse, reducing monthly regulatory reporting effort from 160 hours 8 hours.

• Implemented retail inventory management system integrating with POS across 240 store locations, reducing out-of-stock incidents by 34%.

• Built RESTful APIs for mobile banking enabling 120K customers to transact securely, with validation and audit logging aligned to banking security requirements.

• Developed complex SQL queries/stored procedures optimizing reporting for 500K+ daily records, reducing executive dashboard refresh time from 45 minutes 6 minutes.

• Architected integration middleware connecting legacy AS/400 mainframe systems with modern web apps using message queues and web services, enabling phased modernization.

• Collaborated with business stakeholders on requirements workshops and technical specs, delivering 25– 40% operational efficiency improvements.

• Implemented automated testing frameworks using JUnit and Selenium achieving 78% code coverage, reducing regression bugs by 52%.

• Led code quality initiatives (standards, architecture reviews, SonarQube), improving maintainability scores by 35% and reducing technical debt.

• Worked in Agile teams across 8 major engagements, meeting milestones and earning 4.5/5.0+ client ratings, driving renewals and $2.4M additional scope. Tech Stack: Java, Spring, C#, .NET MVC, Python, JavaScript, REST APIs, SQL Server, ETL Pipelines, Message Queues, Web Services, JUnit, Selenium, SonarQube

EDUCATION

Texas A&M University

Bachelor of Science in Computer Science 2006 – 2010

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