Backend Developer

PeopleForce; Polska; Hybrid; PLN 356,000 - 514,000; Full time

Benefits offered by this job

Remote-first policy

Global team collaboration

Wellbeing: paid time off

Job summary

Weltrade, a reliable international Fintech company, seeks a PHP-focused software engineer to join our product engineering team. You will own features end-to-end, modernise legacy code safely, and manage domain services while collaborating with analysts, QA, and cross-functional teams.

You’ll decompose tasks, tackle integrations with third-party services, ensure data accuracy in attribution and calculations, and continuously improve reliability in a remote-first, global environment.

Qualifications

• 3–6+ years of commercial PHP development experience (strong preference for Symfony).
• Experience working in product teams (understanding the full feature lifecycle).
• Experience supporting and gradually modernising legacy systems.
• Strong understanding of architectural principles.
• Experience integrating third-party APIs (REST, webhooks, authentication, error handling).
• Strong SQL knowledge and understanding of indexes and query optimisation.
• Ability to read and analyse existing code without rewriting everything from scratch.
• Ability to assess risks when changing existing business logic.
• Strong ownership and ability to make technical decisions within the responsibility area.
• High attention to detail in financial and partnership calculation logic.

Responsibilities

• Participate in sprint planning and technical discussions.
• Decompose tasks together with PM and tech leads.
• Develop new functionality within the domain.
• Maintain and refactor legacy code without breaking existing business logic.
• Integrate and support third-party services (affiliate platforms, tracking systems, payment solutions).
• Ensure correct data processing (attribution, calculations, statuses, synchronisations).
• Analyse and reduce technical debt within the team’s domain.
• Improve integration reliability (error handling, idempotency, SLA control).
• Collaborate with analysts and cross-functional teams to clarify requirements.

Skills

PHP development

Symfony

SQL

REST APIs

Webhooks

Code analysis

Technical decisions

Job description

Become a part of Weltrade, a reliable international company with over 19 years of experience in the FX and online trading market.

Join our Global Team! Work From Anywhere! Grow With Us!

About Weltrade

Weltrade is a leading international Fintech company with over two decades of stability and trust in the global FX and online trading industry. Established in 2006, we operate as a truly global, remote-first organisation, bringing together high-performing professionals across multiple time zones.We focus on building scalable trading infrastructure and high-impact commercial ecosystems that drive sustainable client acquisition worldwide. At Weltrade, we value ownership, autonomy, and measurable impact.

About your Role

You’ll join the product engineering team. Your mission is to build predictable, auditable, and resilient domain services while modernising legacy code safely and incrementally. The core challenge is shipping new features, integrations, and calculations without disrupting live traffic or existing operations — here, a small change in logic can turn into a costly mistake. You will have direct ownership over features end-to-end, actively decompose tasks, and collaborate closely with analysts, QA, and cross-functional teams.

Responsibilities

• Participate in sprint planning and technical discussions
• Decompose tasks together with PM and tech leads
• Develop new functionality within the domain
• Maintain and refactor legacy code without breaking existing business logic
• Integrate and support third-party services (affiliate platforms,tracking systems,payment solutions)
• Ensure correct data processing (attribution,calculations,statuses,synchronisations)
• Analyse and reduce technical debt within the team’s domain
• Improve integration reliability (error handling,idempotency,SLA control)
• Collaborate with analysts and cross-functional teams to clarify requirements

You have

• 3–6+ years of commercial PHP development experience (strong preference for Symfony)
• Experience working in product teams (understanding the full feature lifecycle from idea to production)
• Experience supporting and gradually modernising legacy systems
• Strong understanding of architectural principles
• Experience integrating third-party APIs (REST,webhooks,authentication,error handling,retries)
• Strong SQL knowledge and understanding of indexes and query optimisation
• Ability to read and analyse existing code without rewriting everything from scratch
• Ability to assess risks when changing existing business logic
• Strong ownership and ability to make technical decisions within the responsibility area
• High attention to detail (especially in financial and partnership calculation logic)
• Ability to propose improvements with clear technical justification

Nice to have

• Experience in fintech,affiliate marketing,or partnership programs
• Understanding of traffic attribution principles,UTM tracking,and conversion tracking
• Experience with event-driven architecture or message queues
• Experience in gradual monolith decomposition
• Understanding of commission models
• Experience working with high-load systems

What We Offer

- Remote-First Flexibility: We operate fully remotely and offer a global and cross-functional environment.
- Ownership & Impact: A chance to own your ideas and make a measurable impact on Weltrade's global growth.
- Wellbeing: A balanced leave allowance (paid vacation, sick leave, public holidays, etc.) and a supportive culture that values every employee.

Recruitment Process

HR Interview → Technical Interview → Final Interview → Offer