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Senior Full-stack Engineer (ASP.NET, React)

Madfish

Madfish

Software Engineering
Ukraine
Posted on Dec 4, 2025

We are seeking for a strong Full-Stack Engineer with expertise in ASP.NET, React, and Azure cloud platform to join a newly created team working on an internal product.

Location/Type: Remote (from Ukraine)
Hours: UA timezone, flexible

COMPANY
Atlas Technica is a fast-growing US-based MSP, founded in New York in 2016 and focused on the hedge fund sector. The company has scaled rapidly and now has 200+ engineers across 10+ location globally (US, UK, Ukraine, Hong Kong, Singapore).

PRODUCT

The role’s focus is on developing a modern, secure, robust internal web portal used in-house for engineers and company clients collaboration: managing configurations, deployments, tracking metrics, accessing reports, making requests, launching workflows, and more.


RESPONSIBILITIES

  • Design, develop, and maintain high-quality web applications.
  • Conduct code reviews to ensure best practices and code quality.
  • Contribute to technical and project decisions.
  • Take ownership of technical decisions and their implementation.
  • Support the creation of technical documentation.
  • Collaborate with cross-functional teams to ensure the accurate interpretation and implementation of business requirements.
  • Check that new requests don’t break anything in the existing product and are compliant with the main product goals.
  • Take ownership for production releases and bugs fixing.
  • Ensure secure software development practices and proactively address vulnerabilities identified through security scans.

    REQUIREMENTS
  • 6+ years of full-stack web development experience with ASP.NET (Core/WebAPI, C#, React/React.js, MS SQL Server), writing clean, secure, scalable, maintainable code
  • Knowledge of Azure services and deployments (Azure Functions, Azure App Service, Azure DevOps, etc)
  • Extensive knowledge of architecture patterns, experience with microservices
  • Strong understanding of clean architecture, REST API, SOLID principles
  • Experience with unit and integration testing
  • Strong spoken English — Upper-intermediate / B2+

WE OFFER:

  • Direct long-term contract with a US-based company
  • B2B set-up via SP (FOP in $USD)
  • Incentives for specific technology certifications
  • Growth potential as a team lead
  • Annual salary reviews and performance-based bonuses
  • Company equipment provided for work
  • Fully remote role