PHP Full-Stack Developer

About the role
ClassOwl is a school-management system used by educational institutions. We are hiring a Middle+/Senior PHP Full-Stack Developer to join the team and work on our existing product.
The application is built on a custom PHP framework. Most tasks involve extending and improving the current application: adding product functionality, changing web interfaces, maintaining APIs and integrations, and investigating issues reported from staging or production.
The developer will work across backend and frontend parts of a feature. It is important to understand an existing codebase, make changes carefully, and consider how they affect different school installations. We expect the person to take part in a feature from clarification and estimation to implementation and code review.

What you will work with
backend and frontend features in an existing PHP application
vanilla JavaScript, HTML, CSS, jQuery — not a React/Vue SPA
MySQL and SQL queries
REST APIs used by the mobile application
third-party integrations
debugging and fixing issues in staging and production

Responsibilities
clarify requirements together with the Business Analyst, asking questions that help narrow down scope where needed
estimate tasks and discuss solutions with the Lead Developer, considering the impact across different school installations
review code from other developers and give constructive feedback
maintain and extend REST APIs used by the mobile application
integrate and maintain third-party services
investigate and fix bugs reported by QA, Customer Support, and from staging/production
write and optimize SQL queries for new and existing functionality

What we expect
4+ years of PHP web-development experience, including backend and frontend work
strong knowledge of PHP, vanilla JavaScript, HTML, CSS, and MySQL
experience writing and optimizing SQL queries
experience working with an existing (legacy/production) codebase
ability to work with REST APIs and third-party integrations
Git and Linux experience
English at B1 level or higher

Terms of cooperation
We offer two cooperation formats to choose from ФОП (standard) and ФОП+ (an extended package with paid vacation, bonuses, and additional compensations). Details of each format are discussed during the interview.