Senior PHP Developer (FinTech, Payments)

Madfish; Remote; GBP 50,000 - 70,000; Full time

Job summary

A growing FinTech startup is seeking a highly skilled Senior PHP Engineer to enhance their global banking-as-a-service platform. This full-time, remote role requires over 4 years of experience with PHP, expertise in payment gateways, and a strong background in the FinTech domain. You will collaborate directly with the CTO, driving technical advances in a rapidly expanding team. Join us to design and improve payment solutions while implementing crucial architectural enhancements.

Qualifications

• 4+ years of professional experience with pure PHP.
• Strong expertise with payment gateways.
• Solid knowledge with CQRS, DDD, Hexagonal architecture.
• Practical experience with RabbitMQ.
• Proven experience in FinTech or Payments.
• B2+ spoken English.

Responsibilities

• Designing and improving payment gateway and transaction lifecycle.
• Integrating with multiple vendors.
• Conducting major refactoring and system improvement.
• Investigating performance bottlenecks.
• Enhancing observability and monitoring.

Skills

PHP

Payment gateway integration

CQRS

Domain-Driven Design (DDD)

RabbitMQ

FinTech expertise

B2+ spoken English

Tools

3DSecure.io

Stripe

Finix

TriplePay

CPay

PayNetWorx

Job description

We are seeking a highly skilled Senior PHP Engineer with deep FinTech experience to join a Barcelona-based startup building a modern global banking-as-a-service platform that powers corporate payment operations worldwide, including card issuing, multi-currency accounts, FX, treasury tools, and crypto-related services.

It provides a unified infrastructure layer where businesses can manage payments, wallets, cards, compliance, and financial operations through clean APIs and a secure, bank-grade architecture. As part of a small but rapidly scaling engineering team, you will work directly with the CTO and influence the technical foundation of a next-generation FinTech platform.

This is a full-time, long-term, fully remote opportunity with immediate start.

Must-Have Requirements

• 4+ years of professional experience with pure PHP
• Strong expertise with payment gateways (development, integration, transaction flows)
• Solid knowledge and hands-on experience with: CQRS, Domain-Driven Design (DDD), Hexagonal architecture
• Practical experience with RabbitMQ
• Proven background in the FinTech or Payments domain
• B2+ spoken English

Example Scope of Work (from the CTO)

• Designing, developing, and improving Pathly’s payment gateway and transaction lifecycle
• Integrating with vendors such as 3DSecure.io, Payshield, ChargebackHelp
• Payment processors: Stripe, Finix, TriplePay, CPay, PayNetWorx, etc.
• Conducting major refactoring to move the system toward: Microservices, Hexagonal architecture, Domain-Driven Design (DDD)
• Investigating and mitigating performance bottlenecks
• Improving observability, monitoring, and test coverage
• Reducing fragility of unit tests and setting up functional tests from scratch