Senior/Lead .NET Software Developers (CAF)

Medium; Warszawa; Hybrid; PLN 253,000 - 381,000; Full time

Job summary

A leading global communications company in Poland is seeking a Tech Lead C#/.NET Software Engineer to join their Anti-Fraud & Compliance team. You will design high-performance systems to detect fraud and ensure regulatory compliance. The ideal candidate should have over 5 years of experience in C# and strong AWS skills. This offers remote or hybrid working conditions along with great career growth opportunities.

Benefits

Compensation for professional training

First-class English lessons

Challenging job with talented people

Qualifications

• 5+ years of production experience with C# (.NET, MVC, .NET Core).
• Experience in full development cycle from implementation to prod deployment.
• Strong background in AWS or other cloud platforms.

Responsibilities

• Design, develop and optimize backend microservices for real-time transaction processing.
• Drive technical excellence within the team through guidance and mentorship.
• Collaborate with business stakeholders and be a part of the product development team.

Skills

C# (.NET, MVC, .NET Core)

AWS Cloud Platforms

Kubernetes

SQL

NoSQL databases

Communication skills (English B2+)

Tools

Docker

Kafka

Prometheus

Grafana

Job description

Join our mission to protect cross-border transactions, helping customers send money safely worldwide. As a Tech Lead C#/.NET Software Engineer in our Anti-Fraud & Compliance team, you'll architect high-performance systems that detect fraud and enforce regulatory compliance. Our ML stack focuses on tabular modeling for fraud detection.

What you’ll do:

• Design, develop and optimize backend microservices for real-time transaction processing
• Drive technical excellence within the team through guidance, code reviews, and mentorship
• Scale our cloud-native platform on AWS (EKS, Kafka, SQS) with robust observability
• Collaborate with business stakeholders, MLOps engineers, data scientists and be a part of the product development team
• Enhance fraud detection systems using ML
• Boost your career with a big international product company and have new growth opportunities

Tech stack:

• Backend: .NET, Golang, Python
• Data & ML: Supervised learning models, ETL pipelines, search technologies
• Cloud & Infrastructure: AWS (EKS, Kafka, SQS), Kubernetes, Prometheus/Grafana

What you’ll need to succeed:

• Deep knowledge and 5+ years of production experience with C# (.NET, MVC, .NET Core)
• Experience in the full cycle of development from implementation to prod deployment and support
• Strong background in AWS or other cloud platforms
• Experience with Kubernetes, AWS CloudFormation, Terraform, and containerization (Docker)
• Experience with Kafka
• Knowledge of Prometheus, Grafana, OpenTelemetry, Loki, or similar
• Experience with SQL and NoSQL databases like MySQL, MongoDB, Oracle, Redis, or similar
• Strong communication skills (English B2+)

It would be a plus:

• Familiarity with Golang, Python
• Experience in team leadership
• Experience in production usage of any ML technologies and MLOps
• Passion for infrastructure and observability
• Knowledge of fraud prevention, fintech, or compliance

What we offer:

• Remote work as b2b contractor or hybrid/ Remote full-time in Belarus.
• Really good hardware.
• An exciting and challenging job with talented people around.
• Great learning and growth opportunities.
• Compensation for professional training, seminars, and conferences.
• First-class English lessons.
• More perks for the Minsk office full-time employees.

A few words about us:

IDT Corporation is a global communications company founded in 1990 and headquartered in Newark, New Jersey. We are industry leaders in prepaid communication and payment services and one of the largest international voice carriers. We are listed on the NYSE, employ over 1800 people across 20 countries, and have over $1.5 billion in revenues.

We are not “another big IT corporation”— we encourage and support in-house entrepreneurs in developing their ideas into business actions.

We understand the challenge of being apart from those who matter most. Boss Revolution is our flagship brand. It includes International Calling, Mobile Top Up, and Money Transfer services. It enables people to keep in touch with family and friends around the world as well as to send money to more than 50 countries with low fees and great exchange rates.