Senior Full-Stack Software Engineer & Systems Architect
10+ Years Building High-Concurrency Web Platforms, Distributed Backends & AI Engineering Systems
joanperalta13@gmail.com • LinkedIn • GitHub • Cover Letter
Senior Full-Stack Software Engineer with 10+ years of experience architecting, scaling, and optimizing high-traffic web and mobile applications, distributed backends, and AI-enabled developer platforms across FinTech, PropTech, HealthTech, and E-Commerce Marketplaces.
- Scale & Performance: Engineered resilient web platforms sustaining 20,000+ active users/minute on Next.js/Cloudflare (Achieve), live auction distributed backends handling 2,000 to 120,000 requests/minute (InstaCarro), and spearheaded database/CDN overhauls delivering a 70% reduction in response times (Foxbox Digital).
- Core Engineering Principles: Grounded in Clean Architecture, Test-Driven Development (TDD) achieving 90%+ automated test coverage in regulated banking environments (Scotiabank), Domain-Driven Design (DDD), and Core Web Vitals optimization (LCP, FID/INP, CLS).
- AI & DevEx Leadership: Co-author of an enterprise AI Engineering Workflow CLI and multi-agent context platform adopted by 8 engineering teams across 30+ projects, standardizing Model Context Protocol (MCP) integrations, two-tier Architecture Decision Record (ADR) memory, and automated SDLC safety gates.
- Core Technologies: React.js, Next.js (SSR), TypeScript, Node.js (NestJS/Express), Python (Django/DRF), Elixir (Phoenix), PostgreSQL, Redis, AWS, GCP, Kubernetes, Docker, and Cloudflare.
[Remote] Tempe, Arizona - US | May 2024 – Present
- Architected and scaled a mission-critical Next.js & React web platform handling 20,000+ active users per minute, leveraging Server-Side Rendering (SSR) for real-time responsiveness and organic search SEO.
- Optimized frontend Core Web Vitals (LCP, FID/INP, CLS) via dynamic code splitting, aggressive route-level caching, lazy loading, and global Cloudflare CDN / WAF edge protection.
- Integrated LaunchDarkly feature flagging, progressive rollout pipelines, A/B conversion experimentation, and user session analytics to drive product growth and conversion rates.
- Engineered low-latency Node.js microservices deployed on Google Cloud Platform (GCP) and Kubernetes, ensuring sub-second data synchronization under peak US financial traffic.
[Remote] Canada | Jan 2024 – May 2024 · 4 months
- Engineered cross-platform digital mental health applications across Web (React.js) and Mobile (React Native) backed by scalable Node.js services.
- Profiled client-side rendering performance and payload sizes to guarantee high responsiveness for patients and clinicians on low-bandwidth networks and lower-end mobile devices.
- Upgraded offline-first synchronization protocols and ensured strict compliance with WCAG 2.1 accessibility (a11y) guidelines.
- Standardized open-source contribution guidelines, conducted code reviews, and refactored legacy components for improved testability and modularity.
[Remote] Dominican Republic | Aug 2023 – Jan 2024 · 6 months
- Architected from 0-to-1 MVP into production the
mobiliapp.comPropTech platform, featuring a responsive Next.js / React frontend and modular Python (Django / Django REST Framework) backend. - Designed and implemented a recurring subscription payment engine integrating multi-gateway billing (PayPal, CardNet, and Azul).
- Engineered secure third-party API integrations with national credit bureaus to automate tenant risk scoring and background screening.
- Configured production PostgreSQL, Nginx reverse proxies, and DigitalOcean Spaces CDN for media asset delivery with automated Bitbucket CI/CD deployment pipelines.
[Remote] Chicago, Illinois - US | Feb 2022 – Nov 2022 · 10 months
- Stormwind Studios (70% Latency & Load Time Cut): Spearheaded a deep system performance overhaul that achieved a 70% reduction in initial load and API response times through SQL query optimization, database indexing, global asset CDN distribution, and horizontal load balancing across PHP/Drupal services.
- The X Company (
thexlife.co): Developed resilient Elixir / Phoenix microservices and React Native features for a modern co-living platform, integrating IoT Smart-Lock hardware APIs (OpenKey and SaltoKS) for secure mobile keyless entry. - Implemented centralized metrics collection and distributed log streaming using Grafana Loki on Kubernetes (DigitalOcean), accelerating incident triage.
- Co&Co-MVP: Designed a serverless backend architecture leveraging Node.js, AWS Lambda, Firebase, and Docker for high-throughput real-time micro-transactions.
[Remote] Ontario - Canada | Jan 2021 – Feb 2022 · 1 year & 2 months
- Engineered secure, mission-critical retail online banking modules in React.js and Node.js, applying rigorous Test-Driven Development (TDD) to sustain 90%+ automated unit and integration test coverage.
- Delivered high-availability banking workflows including customer authentication, real-time account balances, transaction histories, and bill payments.
- Enforced strict WCAG accessibility and localized user experiences for Latin American and Canadian banking portals.
- Maintained zero-downtime releases via enterprise CI/CD automation, feature flagging, and continuous security scanning.
[On-site] Dominican Republic | Jan 2019 – Dec 2020 · 2 years
- Engineered the foundational full-stack architecture for a FinTech startup, navigating a successful strategic pivot from initial MVP to a multi-tenant SaaS payment gateway platform.
- Integrated third-party payment processors, merchant settlement pipelines, and real-time transaction reconciliation.
- Architected an internal Content Management System (CMS) enabling marketing and operations teams to launch digital acquisition campaigns independently.
No details, private project.
[Remote] São Paulo - Brazil | Jan 2017 – Jan 2019 · 2 years
- Architected scalable, event-driven distributed systems handling 2,000 to 120,000 requests/minute for Brazil’s fastest-growing car inspection and live auction marketplace.
- Built real-time auction bidding services using Node.js, React.js, MongoDB, Firebase, AWS, and Docker.
- Partnered with product and marketing leadership to establish a feature-oriented architecture for A/B testing, driving direct uplifts in user bidding and business conversion rates.
- Contributed to native Android mobile development in Kotlin for the dealer live-bidding app (
InstaCarro Lojistas).
Co-Author & Platform Architect | TypeScript, Node.js, MCP, CI/CD, IaC
- Enterprise Adoption: Architected an extensible TypeScript / Node.js ESM CLI and SDK adopted by 8 engineering teams across 30+ production projects to govern AI-assisted engineering workflows.
- Deterministic Workspace Engine: Built a multi-workspace codebase scanner supporting 7 workspace archetypes (
service,app,frontend,library,cli,iac,data-pipeline) and monorepos (pnpm,turbo,nx), evaluating dependency closures and governance rules across 38 catalog modules. - Model Context Protocol (MCP) Ecosystem: Implemented automated, isolated MCP server configurations connecting AI agents to enterprise tools (Atlassian Jira/Confluence, GitHub, Bitbucket, CircleCI, Datadog, Slack).
- Two-Tier Architecture Memory & Cryptographic Safety: Created a dual-tier context architecture pairing git-versioned Architecture Decision Records (ADRs) with episodic session discoveries, backed by SHA-256 cryptographic approval tokens ensuring zero-clobber human-in-the-loop updates.
- Automated SDLC Guardrails: Embedded multi-agent skills for automated implementation planning, Red-Green-Refactor TDD with CI gates, 7-dimension security audits, and PII/GDPR compliance verification.
- Core Languages & Libraries: TypeScript, JavaScript (ES6+), HTML5, CSS3, Sass/SCSS, Modern Tailwind CSS.
- Frameworks & State: React.js, Next.js (SSR / SSG / ISR), Redux, Redux Toolkit, Vue.js, AngularJS, Vite.
- Performance & Standards: Web Performance Optimization (Core Web Vitals: LCP, FID/INP, CLS), SEO Architecture, WCAG 2.1 AA Accessibility (a11y), Lazy Loading, Dynamic Imports.
- Experimentation: LaunchDarkly Feature Toggles, Progressive Rollouts, A/B Testing, User Session Analytics.
- Runtimes & Frameworks: Node.js (Express.js, NestJS, Koa, Socket.io), Python (Django, Django REST Framework), Elixir (Phoenix Framework), Go (Golang), .NET / ASP.NET, PHP (Laravel, Drupal).
- API Architecture: RESTful APIs, OpenAPI 3.x Contracts, GraphQL, WebSockets, Event-Driven Architecture, Microservices, GCP Pub/Sub, RabbitMQ.
- Databases & Cache: PostgreSQL, MySQL, MariaDB, Microsoft SQL Server, MongoDB, Redis, Memcached, Firebase.
- Cross-Platform: React Native (iOS & Android), Flutter, Ionic / Cordova.
- Native Platforms: Native Android (Kotlin, Java), Native iOS (Swift).
- Cloud Platforms: Google Cloud Platform (GCP), Amazon Web Services (AWS), DigitalOcean, Microsoft Azure.
- Containerization & IaC: Docker, Kubernetes (K8s), Terraform, Nginx, Linux/Unix Shell Scripting.
- Edge & Security: Cloudflare (CDN, WAF, DDoS Protection, Caching Rules), Snyk (SCA/SAST), SonarQube, PII/GDPR Data Protection.
- CI/CD & Observability: GitHub Actions, Bitbucket Pipelines, CircleCI, GitLab CI, Datadog (APM, Logs), Grafana Loki.
- Methodologies: Test-Driven Development (TDD), Domain-Driven Design (DDD), Agile/Scrum, Architecture Decision Records (ADRs).
| Frontend |
 React.js
 Next.js
 TypeScript
 Vue.js
 Vite
|
|---|---|
| Backend |
 Node.js
 NestJS
 Python
Django / DRF
 Golang
 .NET
 Laravel
|
| Databases & Cache |
 PostgreSQL
 Redis
 MongoDB
 MySQL
|
| Mobile |
 React Native
 Android
 Kotlin
 iOS
 Swift
 Flutter
|
| Cloud & Edge |
 Google Cloud
 AWS
 Cloudflare
 DigitalOcean
|
| Quality & Testing |
 Jest
 Pytest
 JUnit
 xUnit
 SonarQube
 Postman
|