Senior Software Engineer (JavaScript + Go/.NET) Offline

We are currently looking for a Senior Software Engineer (JavaScript + Go/.NET ) to join our exciting project in the fintech and crypto space.

We are working on a greenfield project for a US-based client, building a cutting-edge fintech and consumer app in the crypto industry. The product combines agentic AI, crypto rails, and a self-service B2B2C SaaS platform. You will be working alongside experienced engineering managers, leads, and staff engineers in a modern, dynamic environment. The stack is composed of 70% frontend and 30% backend.

Responsibilities:

 • Develop and implement key features for a complex fintech and crypto application.

 • Collaborate with the engineering team to design and build scalable, reliable, and high-performance systems.

 • Work on both frontend (JavaScript) and backend (Go/.NET) components of the product.

 • Write clean, maintainable, and well-tested code following best practices.

 • Participate in code reviews, share knowledge, and contribute to an Agile development process.

 • Collaborate with cross-functional teams, ensuring seamless integration of AI, crypto rails, and SaaS components.

 • Focus on problem-solving and addressing challenges that arise during the development process.

 • Ensure the product aligns with the company’s goals, emphasizing quality, security, and performance.

Required Skills and Experience:

 • 5+ years of experience in software development.

 • Strong proficiency in Go or .NET.

 • Experience with JavaScript frameworks.

 • Hands-on experience with cloud platforms such as AWS, Terraform, or Azure.

 • Solid understanding of CI/CD, Agile processes, and best coding practices.

 • Fluent in English (B2+).

 • Fluent in Polish (B2+).

 • Strong problem-solving skills and a keen eye for detail.