Full Stack Engineer React, Node, PostgreSQL

Bryan Cepeda

Full Stack Engineer

Brownsville, TX ***************@*****.*** +1-956-***-**** linkedin.com/in/bryan-cepeda- 204073417

PROFESSIONAL SUMMARY

Full Stack Engineer with 5+ years building end-to-end web applications across React, Node.js, RESTful APIs, and PostgreSQL, with hands-on ownership from UI to server-side logic and database design. Shipped production features at scale for platforms serving billions of transactions and contributed to robotics-driven healthtech systems from ground up. TECHNICAL SKILLS

Programming JavaScript, TypeScript, Python, Java, SQL, Bash Frontend React, Angular, Vue.js, HTML5, CSS3, Tailwind CSS, Redux Backend Node.js, Express, Spring Boot, Django, REST APIs, GraphQL, gRPC, WebSockets

Databases PostgreSQL, MySQL, MongoDB, Redis, Firebase Realtime Database, Firestore

Cloud & DevOps AWS (EC2, S3, Lambda, RDS, ECS), GCP, Docker, Kubernetes, Terraform, CI/CD

Testing Jest, Cypress, Pytest, JUnit, Supertest, Postman Version Control &

Collaboration

Git, GitHub, GitHub Actions, Jira, Confluence, Agile/Scrum Security & Auth OAuth 2.0, JWT, HTTPS/TLS, Role-based access control PROFESSIONAL EXPERIENCE

Full Stack Engineer 8/2024 – 5/2026

Perceptive Technologies Boston, MA Remote

• Built the full-stack clinical dashboard from scratch using React and Node.js/Express, giving dental surgeons real-time imaging overlays and AI-driven treatment plan previews in a single interface.

• Designed and shipped RESTful APIs connecting the robotics control layer to the web frontend, handling surgical session state, device telemetry, and imaging metadata with strict latency constraints.

• Architected a PostgreSQL-backed patient data model with full audit logging to meet HIPAA compliance requirements, including row-level security policies for clinic-specific data isolation.

• Integrated a WebSocket layer between the robotic arm controller and the browser dashboard so surgeons could monitor procedure progress in real time with sub-second feedback.

• Built a MongoDB collection to store unstructured imaging scan metadata from the novel non- X-ray modality, then exposed filtered views through a paginated GraphQL API.

• Implemented JWT-based authentication with role-based access control, separating permissions for surgeons, assistants, and clinic admins across all API surfaces.

• Containerized all services with Docker and set up a Kubernetes deployment on GCP, cutting environment parity issues between local dev and staging.

• Wired up a GitHub Actions CI/CD pipeline with automated Jest and Pytest test suites, catching regressions before any merge to main.

• Optimized PostgreSQL query plans for the imaging search endpoint that scans across 50,000+ patient records, reducing average query time from multi-second to under 300ms by adding composite indexes.

• Migrated hardcoded clinic configuration from environment variables into a Redis-backed config service, letting ops update settings per clinic without redeploying.

• Built a React component library shared across the surgical dashboard and the patient-facing booking portal, keeping UI patterns consistent across 12+ screens.

• Added cross-browser and mobile responsiveness to the clinician portal so it rendered correctly on iPad-mounted displays used chairside during procedures.

• Wrote integration tests with Supertest and Cypress covering the full API-to-UI flow for surgical session creation, scan upload, and treatment plan approval.

• Set up AWS S3 with pre-signed URLs for encrypted imaging file uploads directly from the desktop scanner client, avoiding large binary payloads through the API server.

• Partnered directly with the YC founder and lead robotics engineer to scope and prioritize the web platform roadmap each sprint, translating hardware constraints into API contracts the frontend could reliably consume.

Full Stack Engineer 1/2023 – 5/2024

Plivo Austin, TX Hybrid

• Built and maintained the developer-facing API console using React and TypeScript, the primary interface through which thousands of businesses like Uber and Zomato configure SMS, WhatsApp, and Voice workflows on Plivo's platform.

• Engineered Node.js/Express backend services handling webhook delivery routing, retry logic, and delivery status tracking across billions of monthly messaging events globally.

• Designed a PostgreSQL schema for campaign-level analytics aggregation, enabling customers to query delivery rates, failure reasons, and throughput per channel across multi- million message batches.

• Refactored the legacy monolithic webhook dispatcher into isolated microservices per channel type (SMS, WhatsApp, Voice), reducing deployment coupling and letting teams ship channel-specific fixes independently.

• Built a Redis caching layer for frequently accessed phone number lookup responses, cutting repeated REST API calls to carrier lookup vendors significantly during high-traffic campaign bursts.

• Integrated MongoDB for storing unstructured inbound message payloads from WhatsApp, handling variable field schemas across different business account configurations.

• Implemented OAuth 2.0 scoped token flow for the API console so enterprise customers could issue restricted API keys per application without exposing account-level credentials.

• Shipped a real-time delivery status feed on the dashboard using WebSockets, replacing a polling approach that was generating unnecessary load on the analytics DB.

• Set up Docker Compose environments mirroring production for local development, eliminating a class of "works on my machine" bugs that had slowed QA cycles.

• Wrote Cypress end-to-end tests for the console's critical flows: number purchase, campaign creation, webhook configuration, and billing summary.

• Deployed updated Express API services through AWS ECS with rolling update strategies, maintaining zero-downtime releases during business hours.

• Debugged a race condition in concurrent webhook retry scheduling that was causing duplicate deliveries on transient network failures, fixing it with a Redis-based distributed lock.

• Added GraphQL subscription support to the analytics API as an experimental layer for customers building real-time reporting dashboards on top of Plivo data.

• Improved cross-platform responsiveness of the developer console across desktop, tablet, and narrow viewport sizes with CSS grid and media query refactors.

• Collaborated with product managers and designers in two-week Agile sprints, consistently translating Figma designs into pixel-accurate, accessible React components on schedule. Software Engineer 7/2021 – 12/2022

Firebase Austin, TX Remote

• Built React-based UI features for the Firebase console used by millions of developers worldwide to manage Firestore databases, Authentication configs, and Cloud Functions deployments.

• Developed Node.js backend services integrating with internal Google Cloud infrastructure to surface real-time project usage metrics and quota alerts directly in the console.

• Designed RESTful API endpoints for the Firebase Extensions marketplace, enabling third- party extension installs, configuration, and update flows through a unified interface.

• Implemented Firestore-backed state management for multi-step onboarding flows, persisting wizard progress so developers could resume setup across sessions and devices.

• Built the PostgreSQL-backed audit log service tracking all console-level admin actions per project, required for enterprise customer compliance reporting.

• Added MongoDB aggregation pipelines in an internal tooling service to process raw SDK telemetry data into per-SDK-version adoption summaries used by the developer relations team.

• Shipped a React component for real-time Firestore rule simulation, letting developers test security rules against sample documents without writing test scripts externally.

• Instrumented frontend events with Google Analytics 4 and internal telemetry SDKs to track feature adoption across console pages, informing quarterly roadmap prioritization.

• Migrated several Express API routes from callback-based async patterns to async/await with structured error handling, making stack traces readable and reducing unhandled rejection incidents.

• Wrote unit tests with Jest and Supertest for all new API routes, maintaining coverage above the team's 80% threshold across the console backend.

• Resolved a CSS layout regression in the Firebase Authentication panel that broke on Safari 15, tracing it to a flex container behavior difference and patching with a targeted fix.

• Integrated GitHub Actions workflows for automated lint, test, and build checks on every pull request, replacing a slower Jenkins-based setup the team had inherited.

• Collaborated with designers to implement accessible, keyboard-navigable modals and dropdowns across the console using ARIA roles and focus trap logic in React.

• Used Git branching conventions and pull request templates to keep code review cycles structured across a distributed team spanning multiple time zones.

• Participated in on-call rotations, triaging console errors from internal monitoring dashboards and filing postmortems for two production incidents during the tenure. EDUCATION

B.E. in Artificial Intelligence Graduated 2021

The University of Texas at Austin

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