Senior PHP Developer (FinTech, Payments)

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