Senior Website Developer
Job Summary
Job Description
Insider, a B2B SaaS company specializing in AI-native Customer Experience and Marketing, is seeking a Senior Website Developer. This role involves developing, optimizing, and designing component systems for Insider's web platform. The developer will work closely with Design, SEO, and Regional Marketing to ensure a fast, modular, and scalable site experience. Key responsibilities include building and maintaining advanced WordPress components, evolving the design system, writing clean and performant code (HTML, CSS, JavaScript, PHP), supporting localization, and ensuring SEO and accessibility best practices. The role also focuses on front-end performance optimization, contributing to CRO experiments, and implementing SEO fixes. Additionally, the Senior Website Developer will mentor junior developers, improve documentation, and collaborate with cross-functional teams. The ideal candidate has 5+ years of web development experience, strong frontend skills, proficiency in WordPress and PHP, experience with Git, and a good understanding of technical SEO and performance.
Must have:
- 5+ years of web development experience
- WordPress theme/plugin development
- HTML5, CSS3, JavaScript
- PHP and WordPress architecture
- Elementor or similar visual builders
- Version control (Git)
- Technical SEO and accessibility
- Page speed tools (Lighthouse)
Good to have:
- Experience managing junior developers
- Systems thinking for scalable frameworks
- CI/CD and deployment flows
- Mentoring experience
19 skills required
Job Details
Before jumping in on all the information about the role and what you can bring to the table, let us introduce ourselves real quick.
About us
We are Insider, a B2B SaaS company that drives growth for its clients around the world. How are we achieving this? We are the #1 AI-native platform for Customer Experience and Marketing—offers marketers a single platform to deliver unique experiences per person, drive profitable growth, and unleash peak productivity and efficiency. Our platform connects data across channels, predicts future behavior with AI, and individualizes experiences from a single platform.
We have just celebrated our $500M Series E funding round, led by General Atlantic. Before this, we’ve unlocked unicorn status following our Series D round. We are backed by top-notch investors, including Sequoia Capital, QIA, Riverwood, and Endeavor Catalyst, and trusted by 1200+ brands from high-growth startups to the most prestigious Fortune 500 companies such as Samsung, Coca-Cola, Nike, L’Oreal, Singapore Airlines, Virgin, Nestle, Nissan, Lenovo, Puma, IKEA, Allianz, Dominos, CNN, and the list goes on.
Having unlocked unicorn status, Insider was congratulated for becoming one of the only woman-founded, women-led B2B SaaS unicorns in the world, to achieve $200M in CARR (Committed Annual Recurring Revenue). Insider was named a leader in The Forrester Wave for Cross-Channel Campaign Management 2021, and Leader in the IDC MarketScape: Worldwide Omnichannel Marketing Platforms for B2C Enterprises 2023 Assessment. The company has been recognized in The Top 1% of all software companies worldwide in G2’s 2024 Software Awards, and named in The Top 10 Best Software Products with the most #1 rankings alongside other software legends like Google, Zoom, and Monday.com. According to G2’s Spring’24 reports. Insider is also the #1 G2 Leader in 6+ categories, including Customer Data Platforms (CDP), Personalization Engines, Personalization Software, Mobile Marketing, Customer Journey Analytics, and e-commerce Personalization.
When our team founded Insider, they not only sought to create a product company but also to build the most socially progressive technology community in the world. Through our corporate social responsibility initiatives like 100Projects SheCodes, SheLeads, and SheMarkables, our community has committed to scaling its impact into our communities across 27+ countries, spearheading transformative projects in areas such as health, education, farming, animal rights, and increasing the proportional representation of women in STEM careers.
Behind all these achievements, there is an exceptionally talented and passionate team across 27+ countries that moves fast and agile, creates cutting-edge products, and focuses on making an impact. If you want to join us on this journey, just keep reading.
What We’re Looking For
We’re looking for a technically strong and detail-obsessed Senior Website Developer to help elevate Insider’s web platform. Reporting to the Website Development Director, you’ll take on key responsibilities across development, optimization, and component system design — working hand-in-hand with Design, SEO, and Regional Marketing to deliver a blazing-fast, modular, and scalable site experience.
You’ll play a pivotal role in building systems that speed up global launches, improve code consistency, and ensure that every page we ship is optimized for performance, UX, and growth.
You’ll succeed in this role if you:
- Think in systems, not just pages — and love building scalable frontend frameworks
- Are highly comfortable with modern WordPress development and PHP-based workflows
- Can optimize for performance without compromising UX
- Can guide junior developers and streamline frontend output for global consistency
- Are familiar with CI/CD, staging, and structured deployment flows
- Enjoy collaborating with design, marketing, and cross-functional teams
Responsibilities
- Architecture & Development
- Build and maintain advanced components using WordPress (Elementor, WPML, PHP, etc.)
- Help evolve and document our internal design system and component framework
- Write performant, clean, reusable code using HTML, CSS, JavaScript, and PHP
- Support localization across multiple markets using WPML and dynamic content structures
- Ensure code output meets SEO, accessibility, and responsive best practices
- Assist in setting up and managing CI/CD, staging, and deployment flows in collaboration with the Director
- Optimization & Performance
- Own front-end performance, Core Web Vitals, and page speed across key templates
- Contribute to structured optimization experiments (CRO, layout testing, UI enhancements)
- Implement schema, metadata, and SEO fixes in collaboration with the marketing team
- Support web analytics setup through clean markup and event structure
- Mentorship & Workflow Enablement
- Support junior developers through code reviews, pair programming, and structured feedback
- Contribute to internal documentation and improve developer onboarding speed
- Collaborate with non-technical stakeholders to ensure handoffs are smooth and specs are clear
- Work closely with the Website Development Director to define and evolve development standards
Requirements and Skills
- 5+ years of professional web development experience, including WordPress theme/plugin development
- Strong frontend experience: HTML5, CSS3, JavaScript
- Proficient in PHP and experienced working within WordPress architecture
- Familiar with Elementor and/or other visual builders and how to extend/customize them
- Experience with version control (Git), branching, and staging environments
- Good understanding of technical SEO, accessibility, and frontend performance
- Familiar with page speed tools (Lighthouse, PageSpeed Insights) and how to apply insights
- Bonus: experience managing junior developers or mentoring others in a fast-paced environment
You’ll Fit Right In If You...
- Enjoy building systems that scale across languages, regions, and teams
- Love crafting components and care about visual consistency
- Take initiative and proactively improve things without waiting to be asked
- Are not afraid to dive into backend logic when needed (PHP, CMS structure, integrations)
- Value structure, clarity, and developer efficiency in fast-moving marketing environments
Was This Role Made for You?
Let’s talk! This is your chance to join a growing global team where your technical input will directly impact how we scale web experiences to millions of users across dozens of markets.
We provide equal opportunity in a zero-discrimination workplace and not just welcome but also embrace everyone without regard to sex, race, color, nationality, religion, gender identity, sexual orientation, disability status, citizenship, or marital status.
We provide equal opportunity in a zero-discrimination workplace and not just welcome but also embrace everyone without regard to sex, race, color, nationality, religion, gender identity, sexual orientation, disability status, citizenship, or marital status.
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