Timothy CevallosTaking new projects

Senior full-stack developer

I build websites, commerce platforms and web apps — with nine years of experience at Athlean-X, Nielsen and independent client projects.

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Hiring for your team? Explore my experience
Selected work / 01
Athlean-X website: training programs and custom e-commerce

Athlean-X

Custom commerce. Real-world scale.

100k+

Daily visitors served

Worked for
  • Nielsen
  • Athlean-X
  • Samtek
  • Antamba
  • Bikerevier
  • Island Painting
01 — How I can help

Most projects begin in one of a few places: a platform you have outgrown, a site that no longer works hard enough, a store that loses the sale at checkout, or nothing live yet. Each page covers what is included, how the work runs, and the questions clients ask first. There is a page for each city I work in, too — business websites in Fort Myers, business websites in Naples, business websites in Cape Coral and business websites in Bonita Springs.

01

Website migration

Move from Contentful, Squarespace, Wix, Drupal, or old WordPress with every page inventoried and every URL redirected.

More about website migration
02

Website redesign

Modernize an existing site: faster, mobile-first, accessible, and ready for local search.

More about website redesign
03

Business websites

A new site for your business that loads fast, ranks locally, and is easy to update.

More about business websites
04

E-commerce websites

WooCommerce stores that stay fast as the catalogue grows, with a checkout that does not lose the sale.

More about e-commerce websites
05

Website maintenance

Updates, backups, security and uptime monitoring, handled by the developer who knows how the site is built.

More about website maintenance
06

Website speed

Slow pages fixed at the cause, measured on a real phone and verified against Core Web Vitals.

More about website speed
07

Web applications

Custom software when a website is not the answer: multi-tenant SaaS, billing, dashboards and internal tools.

More about web applications
02 — Selected work

Commerce at scale. Tools that give editors their time back. A closer look at what I built and why it mattered.

Small business builds

03
Websites2021

Island Painting

Designed and developed a WordPress-based promotional site for a local business, optimizing performance and tracking for lead generation.

  • WordPress
  • JavaScript
  • PHP
  • HTML
  • +7
Read the case studyLive site
04
Websites2022

Antamba

Built a fully custom WooCommerce e-commerce site for a client, handling design, functionality, and optimization from end to end. Integrated with Google and Meta for tracking and advertising.

  • WordPress
  • WooCommerce
  • JavaScript
  • PHP
  • +9
Read the case studyLive site
Explore all case studies
03 — Guides

Nine guides on what a site costs, what to build, how to move one without losing your rankings, and what breaks after launch. Written from the projects above.

Deciding what to build

Fixing a site you have

How we work together

You work directly with the person building it. Clear decisions, visible progress, and a handover you can use.

  1. Understand

    We define the problem, the people using the product, and what success looks like. Scope and priorities come before code.

  2. Build

    I turn the plan into working software, share progress, and make room for feedback. Performance and accessibility are part of the build.

  3. Launch

    We check the details, prepare the release, and hand over the code and documentation so you can move forward with confidence.

Tell me what you have in mind
04 — The person behind the work

I’m a self-taught full-stack developer who has spent nine years inside production systems: a direct-to-consumer business serving 100k+ visitors a day, an enterprise data platform at Nielsen, and a government content migration on a deadline. I know what breaks under real traffic, and I build so it doesn’t.

Working with me is simple. You get a straight answer on scope and price before anything starts, plain-language updates while it’s being built, and full ownership of the code when it ships. Away from the keyboard I cook, garden and train.

01
Frontend
React · Next.js · TypeScript · Tailwind
02
Backend
PHP · Laravel · NestJS · FastAPI
03
Data
PostgreSQL · Redis · pgvector · Qdrant
04
AI
RAG pipelines · vector search · multi-LLM
05 — Capability74 tools

Four tools with the most road behind them, then five kinds of build — each one naming the case study that proves it.

Years in the stack
9years
PHP
Server-side scripting
9years
WordPress
CMS & custom development
5years
React
Component-based UI library
5years
Laravel
PHP web framework
What it has shipped

  • AI that answers from your own content

    Retrieval-augmented search across the documents a business already owns, with more than one model behind a single streaming interface.

    Built with
    PythonFastAPIQdrantpgvectorRAG PipelinesMulti-LLM RoutingClaude APIOpenAI API
    Proof
    AX AI Support Platform

  • Products with money moving through them

    Multi-tenant applications where sign-up, subscriptions, payouts and permissions all have to be right the first time.

    Built with
    Next.jsTypeScriptNestJSPrismaPostgreSQLStripe ConnectClerk Auth
    Proof
    Paganki SaaS Platform

  • Operational data a team can read at a glance

    Live figures from the systems a business already runs, typed end to end and quick enough to check on a phone between jobs.

    Built with
    ReactTypeScriptDrizzle ORMPostgreSQLRedisAuth.jsVercel
    Proof
    Parking Operations Analytics

  • Platforms that stay fast for years

    Long-running PHP estates under real traffic: caching, third-party APIs, and releases that do not take the site down.

    Built with
    LaravelPHPBlade TemplatesMySQLRedisMeta APIsGoogle APIs
    Proof
    Athlean-X

  • Storefronts their owners can actually run

    WooCommerce and WordPress builds the client’s own team can edit without breaking, with the tracking in place to see what sells.

    Built with
    WordPressWooCommercePHPMySQLElementorTechnical SEOGoogle Analytics
    Proof
    Bikerevier
See the full stack
06 — Experience

Nine years across enterprise data platforms, a direct-to-consumer business at scale, and independent client work.

2026 — Present

Senior Web Developer (Contract)

Samtek

Migrating structured content from Contentful into WordPress for a confidential U.S. government agency on an accelerated delivery schedule, with no loss of URLs, accessibility compliance, or editorial workflow.

  • 01Built repeatable migration tooling that maps Contentful content models to WordPress post types, ACF fields, and Gutenberg blocks with automated validation
  • 02Preserved URL structure, redirects, metadata, and Section 508 / WCAG 2.1 AA compliance on every migrated page
  • 03Coordinated phased cutovers with content and QA teams on a compressed, high-visibility timeline

WordPress · PHP · Contentful · TypeScript · Node.js · WP-CLI · REST APIs · ACF · Gutenberg

2024 — Present

Freelance Full-Stack Developer

Self-Employed

Building production-grade SaaS platforms, AI-powered applications, and analytics dashboards for clients using modern tech stacks including Next.js, NestJS, and AI/LLM integrations.

  • 01Built multi-tenant SaaS invoicing platform with Stripe Connect
  • 02Architected RAG-powered AI support system with multi-LLM support
  • 03Developed real-time analytics dashboard for parking operations

Next.js · React · TypeScript · NestJS · PostgreSQL · Stripe · AI/LLMs · FastAPI

2022 — 2024

Senior Web Developer

Nielsen

Led frontend development for enterprise data visualization platform, creating dynamic Gutenberg blocks and improving performance.

  • 01Built custom Gutenberg blocks for data visualization
  • 02Improved site performance and accessibility scores
  • 03Collaborated with product teams on feature delivery

WordPress · PHP · Alpine.js · Tailwind CSS · Chart.js · Gutenberg

2017 — 2022

Full Stack Developer

Athlean-X

Managed full-stack development of high-traffic e-commerce and content platforms serving 100k+ daily visitors.

  • 01Built scalable Laravel e-commerce systems
  • 02Maintained WordPress blog with custom features
  • 03Developed progressive web application portal

Laravel · PHP · WordPress · JavaScript · MySQL · Zend Framework

Years shipping
9+
Daily visitors served
100k+
Projects delivered
50+

Tell me what’s broken or what you need built. You’ll hear back within one business day with a straight answer on scope, timeline and cost.

Tell me what you have in mind
07 — Contact

Tell me what’s broken or what you need built. You’ll hear back within one business day with a straight answer on scope, timeline and cost.

contact@cevallossystems.comReplies within one business day

Replies within one business day