Role Overview
Senior Backend Developer at PayXpert responsible for designing, building, and evolving backend services that support PayXpert's Payment Gateway, Secure Store and other security‑sensitive components within the core payments platform. The role primarily involves PHP‑based e‑commerce gateway development and Java/Kotlin payments platform components, delivering secure transaction services in a regulated and compliance‑driven environment.
Key Responsibilities
Backend Development & Secure Domain Ownership
- Design, develop and maintain payment‑oriented backend services across both PHP (e‑commerce gateway) and Java/Kotlin (core payments platform) codebases.
- Contribute to core payment backend applications with a strong focus on security‑sensitive transaction flows.
- Identify gaps or limitations in core backend services and propose technical solutions aligned with business needs.
- Analyze business and technical requirements to assess feasibility and implementation impact.
- Own backend components end‑to‑end, from design and implementation through production support; act as a co‑owner of the PHP e‑commerce gateway, sharing accountability for its evolution, security and reliability.
Security, Reliability & Performance
- Apply secure coding practices appropriate for transaction‑critical and sensitive data environments.
- Support the implementation of payment protocols and security‑related service interactions.
- Participate in incident analysis and troubleshooting related to payment services.
- Ensure backend services meet reliability, performance and data integrity requirements.
- Critically review AI‑assisted code for security, correctness and compliance before it reaches production.
Testing, Quality & Continuous Integration
- Design and perform unit and integration testing for payment services.
- Debug and resolve defects identified during CI pipelines and iterative builds.
- Maintain and continuously improve test coverage and backend quality standards.
- Participate actively in code reviews to ensure consistency, quality and security standards.
- Use AI coding assistants to accelerate test authoring, refactoring and debugging while retaining full ownership and accountability for the delivered code.
Collaboration & Delivery
- Work closely with Product Managers to design and deliver backend solutions using agile methodologies.
- Collaborate with peer developers, QA engineers and release teams across the Core Business Domain.
- Provide technical support for complex production issues and internal problem‑solving when required.
Continuous Improvement
- Contribute to improving backend architecture, service interactions and development practices.
- Support documentation and knowledge sharing related to Secure Store services.
- Actively contribute to improving system robustness and long‑term maintainability.
- Help mature the team’s practices for effective and responsible AI‑assisted development, sharing prompts, patterns and guardrails that improve productivity without compromising security.
Requirements
- Bachelor’s degree in Computer Science, Engineering or related fields.
- 7–10 years of total backend development experience, including secure, high‑risk backend systems.
- 4–6 years in similar senior PHP/Java/Kotlin backend roles, owning production services and developing secure backend features.
- Experience working with REST‑based backend architectures and service‑oriented systems.
- Strong familiarity with development and delivery tools: Git, GitLab, Docker, CI/CD pipelines and issue‑tracking tools.
- Hands‑on experience using AI coding assistants in a professional software development workflow, with an understanding of their security and data‑confidentiality implications.
- Experience working in payments, fintech or other regulated and security‑sensitive environments is a strong plus.
- Exposure to or ability to collaborate on systems built with Java / Spring Boot is a great plus.
- Fluent English is mandatory.
- French and/or Spanish are a plus.
Compensation & Benefits
- Competitive salary package with a permanent contract.
- Flexible working hours and a wellbeing‑focused intensive summer schedule.
- International, diverse and collaborative teams across Spain, France & the UK.
- Continuous learning opportunities tailored to your development plan.
- Free language courses (Spanish, French, English) to support your global career.
- Employee referral bonus program.
We believe in equal employment opportunity, a culture built around gender‑balanced development opportunities for our professionals, a adaptable and healthy working environment, and general equality in the workplace.
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