Senior Software Engineer – Backend, PHP

Qualco Technology

Senior Software Engineer developing high-performance PHP services for a fintech company. Involved in greenfield projects with a strong emphasis on compliance and clean architecture.

Posted 7/7/2026full-timeAthens • 🇬🇷 GreeceSeniorWebsite

Tech Stack

Tools & technologies

PHPRuby on Rails

About the role

Key responsibilities & impact

Design and build high-performance PHP services, background jobs, and REST APIs that orchestrate real financial transactions end to end;
Write modern PHP (8.2+) with strict types, PSR standards, and a hexagonal / DDD architecture organised around clear bounded contexts;
Implement distributed workflows using orchestration patterns (Saga) across identity verification, credit scoring, contract creation, e-signing, disbursement, and ledger updates;
Integrate with third-party providers across KYC, AML screening, qualified electronic signatures, open banking, card acquiring, and interbank payment rails;
Review pull requests: catch bugs, enforce standards, and propose better patterns;
Take ownership of features from design to production, working with product, risk, and compliance stakeholders in an agile setup;
Contribute to decisions on architecture, code quality, and performance as the platform scales;
Ensure that all activities and duties are carried out in full compliance with regulatory requirements and supporting the continued implementation of the Group Anti-Bribery and Corruption Policy.

Requirements

What you’ll need

5+ years of professional software engineering experience with strong backend expertise;
Advanced PHP (ideally 8.x): strict types, OOP, design patterns, testing, maintainable application architecture;
Solid grasp of relational databases: schema design, indexing, query optimisation, transactions, data consistency;
Proven experience building and maintaining REST APIs with clear contracts, versioning, error handling, security, and backwards compatibility;
Experience with distributed or mission-critical systems where reliability, latency, and correctness matter;
Strong testing discipline (unit, integration, contract) and sound judgment on what to test and at which level;
Security-first mindset: injection risks, data exposure, authentication, authorization, edge cases, failure modes;
Familiarity with asynchronous processing, retries, idempotency, and eventual consistency patterns;
Solid experience with Git workflows, CI/CD, and collaborative code review;
Ability to lead technical discussions, explain trade-offs, and communicate clearly with engineers and non-engineers;
Ownership mindset: you can take ambiguous, complex problems and drive them to reliable outcomes.

Benefits

Comp & perks

Competitive compensation, Meal vouchers, and annual bonus programs.
Cutting-edge IT equipment, mobile phone, and data plan.
Modern facilities, free coffee, beverages, indoor parking, and in-house restaurant.
Private health insurance, occupational doctor, workplace counselor and nutritionist.
Onsite gym, wellness facilities, and ping pong room.
Career and talent development tools.
Mentoring, coaching, personalized annual learning, and development plan.
Employee referral bonus, regular wellbeing, ESG, and volunteering activities.

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

PHP (8.2+)OOPDesign PatternsTesting DisciplineRelational DatabasesSchema DesignQuery OptimisationAsynchronous ProcessingError HandlingVersioning

Soft Skills

Clear CommunicationOwnership MindsetTechnical Leadership