Senior Web Developer
Job Description
The Ad Firm is a Digital Marketing Agency based in Southern California, serving clients nationwide. Since 2009, we’ve helped businesses grow through SEO, content, and performance-driven digital strategies.
We’re expanding our team and looking for a Senior Web Developer to lead how our websites are built from the ground up. This is not a production role. This is a systems-level engineering role for someone who understands that websites are not just design deliverables, they are performance assets that need to rank, scale, and hold up under real-world conditions.
This is a remote position with flexible working hours from day one.
About the Role
- Own the technical foundation of the websites we build
- Architect, develop, and optimize custom builds for SEO, performance, and scalability
- Work closely with SEO, Content, and Digital PR teams to ensure strong technical execution
- Build systems that are clean, scalable, and maintainable
- Focus on engineering quality over page builders or pre-built themes
Key Responsibilities
- Architect and build fully custom WordPress websites (themes, plugins, ACF-driven structures)
- Engineer sites for speed, scalability, and strong Core Web Vitals performance
- Handle server environments, deployments, and infrastructure decisions
- Integrate APIs and third-party systems cleanly and reliably
- Own technical SEO implementation (crawlability, indexation, structured data)
- Manage DNS, CDN (Cloudflare), SMTP, and hosting configurations
- Work across Shopify and BigCommerce at the code level when needed
- Implement accurate tracking (GA4, GTM) without compromising data integrity
- Debug issues across the full stack (server, backend, frontend performance)
What We’re Looking For
- 5+ years of web development experience in agency or performance-driven environments
- Deep expertise in PHP (including WordPress core-level development)
- Strong JavaScript experience with modern frameworks and tooling
- Working knowledge of Python (automation, scraping, tooling)
- Proven experience building custom WordPress websites from scratch
- Strong understanding of technical SEO and its impact on architecture and performance
- Ability to diagnose and solve full-stack issues independently
What Sets You Apart
- You think in systems, not pages
- Experience working on large-scale or SEO-heavy websites
- Strong understanding of crawlability, indexation, and internal linking at scale
- Experience with schema and structured data implementation
- Exposure to programmatic SEO or dynamic page generation
- Experience handling real-world constraints (traffic spikes, broken deployments, legacy rebuilds)
Strong Advantages
- Experience with CI/CD pipelines and Git workflows
- Familiarity with Docker or modern dev environments
- Experience with log analysis and advanced debugging
- Security hardening and site recovery experience
- Experience with multi-site or multi-location SEO builds
What We Don’t Want
- Heavy reliance on page builders
- Plugin-first approaches to performance and SEO
- Developers who need constant direction or step-by-step instructions
Why Join Us?
- High ownership with real technical decision-making
- Clean builds with no unnecessary bloat
- Direct collaboration with SEO, Content, and Digital PR specialists
- A team that values performance, scalability, and engineering quality
- Competitive salary and performance-based incentives
- Flexible remote work from day one
- 2 weeks Paid Time-Off
- Paid Sick Leave
- 8 Paid Holidays
- Health Insurance
Ready to Apply?
- Submit your resume
- Include a portfolio with examples of custom builds
- Add a short note on how you approach building high-performance websites
Salary: ₱60,000 - ₱80,000
Originally posted on Himalayas