AI-Assisted .Net Engineer

Altamira is a software development outsourcing company. We provide solutions that make a tangible impact on our client’s growth and productivity. With domain knowledge across product and technology development, we aim to provide cost-efficient solutions without compromising quality. We are driven to deliver the best, every single time.

Altamira service delivery teams currently span Slovakia, Ukraine, and the Middle East, and we have ambitions to expand our footprint to meet the growing demand across Europe and into our primary growth markets in the UK and the US. In terms of industry verticals, we are focused on EdTech, Fintech, eCommerce, and Pharma.

We are building a modern web platform for aircraft maintenance programs that helps operators manage maintenance schedules, costs, and reliability across fleets of turbine-powered aircraft.

The goal is to modernize the backend architecture by migrating legacy PHP functionality to a scalable, production-ready .NET system while preserving all business rules and workflows. The project emphasizes clean architecture, safe migration strategies, and AI-assisted development practices.

Role Overview

We are looking for a Senior .NET Engineer with deep expertise in C# and ASP.NET Core, strong legacy migration experience, and practical daily use of AI coding tools.

This role involves leading backend modernization efforts, designing robust APIs, migrating data models, and ensuring functional parity between legacy and new systems.

Responsibilities

Backend Development & Migration

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Build and maintain a modern .NET backend

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Incrementally migrate legacy PHP functionality while preserving business rules and workflows

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Apply clean architecture, CQRS, and sound domain modeling principles

AI-Assisted Development

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Use AI tools (Copilot, Cursor, Claude Code, etc.) to accelerate coding, refactoring, and test scaffolding

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Critically validate AI-generated output and catch inconsistencies

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Structure tasks to maximize AI efficiency

API & Database Work

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Design RESTful APIs for the new React frontend

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Implement contract-first API design and versioning strategies

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Migrate legacy data models into clean .NET domain models

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Ensure data integrity during migration

Testing & Quality Assurance

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Write unit and integration tests (xUnit/NUnit, Moq)

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Ensure feature parity and regression safety during migration

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Leverage AI tools to accelerate test coverage

Deployment & Knowledge Sharing

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Support CI/CD pipelines and containerized deployments

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Work with cloud infrastructure (Azure preferred)

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Share AI-assisted development practices with the team

Requirements

Senior-Level .NET

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Deep expertise in C#, ASP.NET Core, and Entity Framework Core

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Strong understanding of dependency injection, middleware pipeline, and RESTful API design

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Ability to design layered/clean architecture and apply CQRS patterns

Legacy Migration Experience

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Experience decomposing and rewriting legacy systems

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Understanding of the strangler fig pattern

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Experience running legacy and new systems in parallel

AI Coding Tools Proficiency

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Demonstrable daily use of AI-assisted development tools

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Strong prompt engineering for complex code generation and refactoring

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Ability to critically validate AI-generated output

Database & Data Migration

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Strong experience with SQL Server, PostgreSQL, or MySQL

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Schema design and migration scripting

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Mapping legacy PHP/MySQL models to .NET domain models

Testing & Quality

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Strong unit and integration testing practices

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Understanding of migration-specific testing strategies

CI/CD & DevOps

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Experience with GitHub Actions, Azure DevOps, or GitLab CI

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Containerization with Docker

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Cloud deployment experience (Azure preferred)

Nice to Have

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Reading-level PHP knowledge (Laravel, Symfony, or vanilla)

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Azure platform services (App Service, Azure SQL, Blob Storage, Application Insights)

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OpenAPI/Swagger-first API design

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Performance optimization (.NET profiling, caching strategies, async processing)

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Documentation-driven development (ADRs, technical specs)

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Mentoring and AI workflow enablement

Our transparent recruitment journey usually takes up to 2 weeks and includes a few stages:

• Recruiting Interview -> 30-45 min

• Technical Interview -> 1-1,5h

• Client Interview (optional) -> up to 1h

• Pre-Offer Call -> 15min

• Reference Check

• Offer

We offer:

• Competitive salary, room for development and growth.

• Possibility to work in the Bratislava and Kyiv offices or fully remotely.

• Loyal management, interesting tasks, constant support.

• Medical insurance (optional).

• English courses.

• Technical equipment providing.

• Paid vacations 20 workdays, paid sick leave, regular salary reviews;

• Flexible schedule and ability to manage your working hours;

• Support your personal growth and skills upgrading.

• The great environment inside the team, support of initiatives, and ability to contribute to the common goal.

We do believe that the success of altamira.ai is impossible without the success of our Talents and the success of our Clients!