Job Description

About the Role:
We are seeking a Senior C# .NET Developer with strong experience in the payments industry--ideally with exposure to payment gateways, PayFacs, or acquirers, or having integratedwith providers such as Stripe, Adyen, Worldpay, or similar.
The ideal candidate will be self-sufficient, proactive, and a go-getter who can thrive in a fast-paced environment while taking ownership of end-to-end delivery.
This is a senior-level hands-on development role, requiring deep technical expertise, problem-solving ability, and a passion for delivering high-quality software that powers critical payment systems.
Key Responsibilities:
- Design, build, and maintain high-performance C# .NET applications for payment processing, and financial systems.
- Architect and develop secure, reliable, and scalable services, with a focus on GRPC-based APIs, and integrations.
- Lead the integration of third-party payment providers, acquirers, and gateways.
- Ensure compliance with PCI-DSS and other regulatory requirements.
- Drive best practices in coding standards, architecture, testing, and CI/CD pipelines.
- Mentor junior developers and contribute to technical leadership.
- Collaborate closely with stakeholders to deliver innovative payment solutions.
Required Skills & Experience:
- 5+ years of professional experience in software engineering, with at least 3 years in C#/ .NET.
- Strong background in payments: gateways, PayFacs, or acquirers.
- Proven hands-on experience integrating APIs (Stripe, Adyen, Worldpay, Braintree, etc.).
- Strong knowledge of GRPC (designing, implementing, and consuming services).
- Expertise in SQL databases and transaction handling.
- Strong understanding of microservices, event-driven systems, and cloud platforms.
- Solid grasp of security best practices (authentication, encryption, tokenization).
- Excellent problem-solving and debugging skills.
- Self-driven, proactive, and able to work independently.
Desirable Skills:
- PCI-DSS compliance and payment security standards.
- Experience with Kubernetes/Docker and cloud-native deployments.
- Familiarity with DevOps tools (CI/CD, monitoring, logging).
- Knowledge of financial data flows, settlement, and reporting systems.
Personal Attributes
- Go-getter mindset: proactive and drives projects forward.
- Strong communicator across technical and business teams.
- Passion for continuous learning and improvement.
At Infotree, meeting your career needs is a top priority. Client satisfaction is largely dependent on the resources we can provide, and we take pride in our delivery. We have a supportive team in place to give quality people a chance to grow and challenge themselves in their roles which has resulted in that we have placed many employees in positions that have grown into lifelong careers.
We have a team of dedicated recruiters and consultant care representatives that are committed to your success and well-being. to get started.
Infotree Poland Sp. z o.o. is part of Infotree Global Solutions. Agency number: 15970.

Skills Required