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I’m César Siancas, a results-driven Senior WordPress Developer with 10+ years of experience delivering high-performance, scalable, and SEO-optimized websites. I design and implement custom WordPress themes and plugins, integrate third-party APIs, and oversee end-to-end development for startups and marketing agencies. I’m passionate about user experience, responsive design, and technical SEO. I specialize in building robust architectures with modern practices, leading projects from concept to post-launch support, and helping clients achieve speed, reliability, and conversions. Based in Bangkok, Thailand.…I’m César Siancas, a results-driven Senior WordPress Developer with 10+ years of experience delivering high-performance, scalable, and SEO-optimized websites. I design and implement custom WordPress themes and plugins, integrate third-party APIs, and oversee end-to-end development for startups and marketing agencies. I’m passionate about user experience, responsive design, and technical SEO. I specialize in building robust architectures with modern practices, leading projects from concept to post-launch support, and helping clients achieve speed, reliability, and conversions. Based in Bangkok, Thailand.

César Siancas

Web Developer, Full Stack Developer, Front-End Developer, +3

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I’m César Siancas, a results-driven Senior WordPress Developer with 10+ years of experience delivering high-performance, scalable, and SEO-optimized websites. I design and implement custom WordPress themes and plugins, integrate third-party APIs, and oversee end-to-end development for startups and marketing agencies. I’m passionate about user experience, responsive design, and technical SEO. I specialize in building robust architectures with modern practices, leading projects from concept to post-launch support, and helping clients achieve speed, reliability, and conversions. Based in Bangkok, Thailand.…I’m César Siancas, a results-driven Senior WordPress Developer with 10+ years of experience delivering high-performance, scalable, and SEO-optimized websites. I design and implement custom WordPress themes and plugins, integrate third-party APIs, and oversee end-to-end development for startups and marketing agencies. I’m passionate about user experience, responsive design, and technical SEO. I specialize in building robust architectures with modern practices, leading projects from concept to post-launch support, and helping clients achieve speed, reliability, and conversions. Based in Bangkok, Thailand.

Available to hire

I’m César Siancas, a results-driven Senior WordPress Developer with 10+ years of experience delivering high-performance, scalable, and SEO-optimized websites. I design and implement custom WordPress themes and plugins, integrate third-party APIs, and oversee end-to-end development for startups and marketing agencies.

I’m passionate about user experience, responsive design, and technical SEO. I specialize in building robust architectures with modern practices, leading projects from concept to post-launch support, and helping clients achieve speed, reliability, and conversions. Based in Bangkok, Thailand.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Language

Spanish; Castilian

Fluent

English

Fluent

Work Experience

Senior WordPress Developer at FreezerFit LLC

December 1, 2024 - February 1, 2025

Led the integration of BuddyPress to enhance community features and delivered custom features and performance improvements to boost site speed and scalability, along with technical updates and bug fixes to improve UX and stability.

Senior WordPress Developer at Keystroke Learning

February 1, 2025 - April 1, 2025

Developed a custom WooCommerce-integrated plugin for course sales and scheduling, built automated workflows with personalized email notifications, and streamlined backend processes to improve the admin experience for course management.

Senior WordPress Developer at LaGrande Marketing

October 1, 2018 - September 1, 2022

Led technical SEO audits, speed optimizations, and ongoing maintenance; delivered fully responsive WordPress websites using Beaver Builder with reusable custom modules; managed end-to-end project lifecycle from theme development to post-launch support.

Senior WordPress Developer at LaGrande Marketing

December 1, 2023 - April 1, 2024

Rejoined to continue multi-site projects, focusing on multilingual support, performance enhancements, and scalable deployment strategies for ongoing marketing initiatives.

Senior WordPress Developer at Test Gorilla B. V.

August 1, 2022 - May 1, 2023

Engineered multilingual support for custom themes and plugins, created scripts to monitor performance and boost load speeds, and automated translation workflows with multi-environment deployment.

Senior WordPress Developer at Orderly Health

February 1, 2022 - June 1, 2022

Designed and launched the main company website using Beaver Builder; created reusable components for editors and integrated forms with Salesforce; improved lead capture through seamless third-party integrations.

Senior WordPress Developer at Pocketmade

August 1, 2021 - December 1, 2021

Maintained and enhanced a custom theme and plugins integrated with marketing and call center services; managed advanced API integrations with LeadConduit and BlueShift; built Zapier automation to connect multiple lead sources.

Senior WordPress Developer at Praxent

January 1, 2021 - May 1, 2021

Resolved critical SEO issues, enhancing site visibility and load speed; developed Gutenberg blocks and transitioned the site away from WPBakery; led site optimization and future-proofed the architecture.

Senior WordPress Developer at Bridgecrew

May 1, 2020 - March 1, 2021

Designed a modern, responsive WordPress theme using Tonik starter and ACF blocks; delivered ongoing support and tailored features; implemented UX improvements and bug resolutions.

Senior WordPress Developer at The Dancel Group, Inc.

September 1, 2020 - November 1, 2020

Developed a custom plugin for social media scheduling and data import; integrated WooCommerce with subscription support; designed and implemented a theme with flexible backend editing via ACF.

Senior WordPress Developer at RoshReview

October 1, 2020 - December 1, 2020

Set up and configured a new WordPress multisite network; designed parent and child themes using Tailwind CSS and Tonik; delivered performance enhancements and SEO improvements.

Senior WordPress Developer at LyraThemes

May 1, 2020 - August 1, 2020

Designed and coded WordPress themes following best development practices; created a custom OOP plugin and provided plugin/theme support and debugging.

WordPress Developer at M4Agency

February 1, 2017 - June 1, 2017

Designed themes and plugins for multiple clients; converted Flordecana.com from static HTML to a dynamic WordPress site; maintained client websites and ensured smooth content updates.

WordPress Developer at Mabbly

December 1, 2012 - September 1, 2016

Delivered custom WordPress themes and plugins for diverse business sectors; achieved site speed improvements; integrated NeonCRM and built a Kohana PHP-based system for Advisor.tv; built and maintained WordPress websites for multiple clients.

Senior WordPress Developer at Test Gorilla B . V.

August 1, 2022 - May 1, 2023

Engineered multilingual support for custom themes and plugins. Created scripts to improve SEO, monitor performance, and boost load speeds. Automated translation workflows using XLIFF and streamlined multi-environment deployment.

Senior WordPress Developer at Test Gorilla B.V.

August 1, 2022 - May 1, 2023