Senior WordPress Backend Developer

About Massive Bio
Every cancer patient deserves access to treatment options. Massive Bio is an AI-powered precision medicine platform transforming how cancer patients discover and access clinical trials by eliminating the barriers of geography, financial constraints, and information asymmetry that have historically limited enrollment.

Founded in 2015 and headquartered in US, Massive Bio is scaling its impact globally by powering operations across multiple countries and bringing innovative cancer treatment options to a rapidly growing and diverse population of patients. Through our proprietary AI platform, we connect individuals to clinical trials worldwide and partner with leading pharmaceutical companies, contract research organizations (CROs), and healthcare systems to accelerate drug development and expand equitable access to cutting-edge therapies.

We're recognized as a leader in health-tech innovation. Massive Bio was featured as #4 in Fast Company's Startup 100 list for Turkey and has raised $24M total funding from impact-driven investors including Revo Capital, the International Finance Corporation, and Cavendish Impact Foundation, validating both our business model and our mission-driven approach.

Role Summary
As a member of our Software Development team, the Senior WordPress Backend Developer’s responsibilities include implementation and maintenance of scalable web applications and services.

What You’ll Do
Reporting to the Software Development Director, this new hire will:

• Develop, customize, and maintain WordPress websites, themes, and plugins.

• Develop and support WordPress backend software, including applications, database integrations, interfaces, and new functionality enhancements.

• Customize WordPress core functionality using PHP and JavaScript to meet business needs.

• Ensure high-performance, reliability, and maintainability of code.

• Optimize WordPress performance, security, caching, and scalability.

Who You Are

• Minimum 5 years of experience with PHP, including extensive experience customizing WordPress (themes, plugins, hooks, filters, API integrations).

• Strong experience with MySQL.

• Experience with RESTful web APIs, JavaScript, jQuery, AJAX technologies.

• Knowledge of CSS, HTML, and ability to customize UI elements within WordPress.

• Experience working with Jira, Git, Agile methodologies, and continuous integration tools.

• Self-starter with the ability to work independently, multitask, and prioritize effectively.