Senior Backend Developer; PHP

At White Tech, we empower businesses in the financial ecosystem with cutting‑edge white‑label and SAAS solutions.

Our comprehensive suite of tools is tailored for EMI, PSP, e‑commerce, and open banking platforms. With White Tech, clients gain access to a platform designed for flexibility, scalability, and seamless integration.

Our mission is to help businesses unlock their full potential in a rapidly evolving financial landscape.

Whether scaling your PSP, enhancing your EMI services, or diving into open banking,
White Tech is your partner for innovation and growth.

We are a remote‑first technology company and welcome applications from candidates across Europe, including the EEA, the UK, Switzerland, and other non‑EEA European countries such as Ukraine, Moldova, Georgia, Armenia, Montenegro, Turkey, and the Western Balkans. We also consider applicants from different locations who can work within Central European Time (CET).

In your role at White Tech, you'll be at the heart of our mission to revolutionize payments worldwide. Your expertise will be critical in analysing data, processes, and code to identify, resolve or prevent issues and drive product improvements. You will contribute to developing a secure, well‑tested and high‑performing product, setting new standards in the fintech industry.

• Designing, developing, testing, documenting, releasing and supporting software from scratch.
• Enhancing and refining our existing API and backend systems.
• Integrating third‑party solutions to broaden our payment ecosystem (acquirer, gateway, alternative payment methods, token platforms, systems for verification/scoring/monitoring of customer operations, reporting, etc.).
• Running tests to make sure everything works as it should and setting up a testing environment for checking new features.
• Fixing existing bugs and debugging the developed software.
• Preparing necessary technical documentation.
• Provide support for the implemented software in production.
• Collaborating with the front‑end developers and other team members to complete all of the above tasks in the most efficient way.
• This role is about improving our products and solving problems, so we’re looking for someone with excellent troubleshooting skills, curiosity for innovations and unconventional solutions.

• Understanding of best practices for optimizing code and web products in PHP, working with caching, asynchrony. Knowledge of best practices for developing and supporting large‑scale projects.
• Deep understanding of OOP.
• Deep understanding of Symfony
  . Proficient in designing and implementing RESTful APIs using Symfony. Proficient in Doctrine ORM.
• Relational Database Management (Postgre
  
  SQL). Proficiency in optimizing complex SQL queries for performance using techniques such as query rewriting, indexing strategies, and query execution plans.
• Proficient in designing database schemas, including normalization techniques, entity‑relationship modeling, and schema design best practices.
• Understanding the inner workings of Kubernetes, Docker and its components such as Docker Engine, Docker Hub, Docker Swarm.
• Deep SOLID, GRASP understanding. Deep understanding of a broad range of design patterns, including their motivations, structures, and implementations.
• Knowledge of advanced DDD concepts such as Domain Events, Domain Services, Bounded Contexts. Ability to design a domain model for complex business problems and use it to solve real problems. Understanding the importance of application context and developing Bounded Contexts to separate domain models.
• Advanced understanding of CQRS principles and benefits, including asynchronous command processing, data synchronization between read and write models. Experience using design patterns and architectural patterns to implement an effective CQRS‑based architecture.
• Advanced knowledge of professional architecture design practices. Experience designing and developing complex, large systems using architectural templates and patterns. Ability to define and document architectural solutions and solve problems related to system complexity and scalability.
• Advan…