Senior C# .NET Full Stack Developer

Intellect; Dublin; Hybrid; EUR 90,000 - 120,000; Full time

Job summary

Intellect is hiring a Senior C# .NET Full Stack Developer to join a large-scale enterprise programme in Dublin. You will design and deliver secure, scalable software across front-end and back-end layers, APIs, and databases, collaborating with business users, testers, and other technical teams.

You will work in a hybrid setup (2 days onsite / 3 days remote), participate in code reviews, and contribute to technical design and deployment documentation while prioritising security and data

Qualifications

• 5+ years of professional software development experience.
• /* ensure ≤140 chars */
• Strong C# and .NET development experience.
• Experience developing enterprise-level software solutions.
• Proficient with Microsoft SQL Server and T-SQL.
• Experience with MVC framework and OO design.
• Experience with Microsoft Entra ID / Azure AD.
• Knowledge of OpenID and web security.
• Experience across the full SDLC in medium/large projects.
• Fluent English communication.

Responsibilities

• Deliver full-stack features across UI, business logic, APIs, and data layers.
• Implement authentication and identity management with Entra ID/Azure AD.
• Develop and maintain SQL Server databases, stored procedures, and data integrations.
• Troubleshoot defects, performance issues, and interoperability problems.
• Contribute to technical design documentation and deployment notes.
• Collaborate with cross-functional teams to clarify requirements and deliver outcomes.
• Ensure security and compliance across development activities.

Skills

C# & .NET

Enterprise software

MVC framework

.NET Core

SQL Server & T-SQL

Azure AD / Entra ID

OpenID

Web security

Team collaboration

English communication

Education

ICT / Computer Science degree

Job description

Location: Dublin – Hybrid (2 days onsite / 3 days remote)

Contract: 11 months of full-time work (fixed-term, no extension)

Hours: Full-time, Monday–Friday, 8 hours per day between 8:30 and 17:30

Start Date: Immediate

About the Role

Are you an experienced Senior C# .NET Full Stack Developer with a strong background in enterprise software development, secure web applications, and Microsoft technologies? This role offers an opportunity to work as part of a large-scale technology programme, supporting the development, enhancement, and maintenance of enterprise-level applications.

You will play a key role in designing and delivering high-quality full-stack solutions across front-end interfaces, business logic, APIs, data-access layers, and databases. You will work closely with development, business, testing, and project teams to deliver secure, scalable, reliable, and maintainable software solutions.

Role Overview

You will operate within a collaborative delivery environment and contribute across the full software development lifecycle, from analysis and technical design through to development, testing, deployment, maintenance, and continuous improvement.

Responsibilities

• Deliver full-stack application features covering front-end interfaces, business logic, APIs, data-access layers, and database components.
• Implement authentication, authorisation, and identity-management solutions using Microsoft Entra ID / Azure AD, OpenID, and appropriate web-security standards.
• Develop, optimise, and maintain Microsoft SQL Server databases, stored procedures, queries, and data integration processes.
• Investigate, troubleshoot, and resolve application defects, performance issues, and interoperability problems.
• Develop solutions that are reliable, secure, scalable, and fit for purpose.
• Participate in code reviews, testing, deployment, release, and maintenance activities.
• Contribute to technical design documentation, solution specifications, deployment notes, and knowledge-transfer materials.
• Work closely with business users, analysts, testers, developers, and other technical teams to clarify requirements and deliver agreed outcomes.
• Support application incidents and recommend appropriate technical fixes and improvements.
• Support users of bespoke full-stack web applications by investigating and resolving support requests.
• Identify and resolve common technical issues and contribute to continuous improvement.
• Ensure development activities comply with applicable security, data-protection, accessibility, and change-management requirements.
• Contribute to technical decision-making and the delivery of complex software projects.
• Work effectively both independently and collaboratively within a multidisciplinary environment.

Knowledge & Experience Required

• Minimum of 5 years' professional experience in software development.
• Strong professional experience in C# and .NET development.
• Proven experience developing enterprise-level software solutions.
• Good experience with .NET Core, .NET libraries, and ADO.NET.
• Strong working knowledge of Microsoft SQL Server and T-SQL.
• Experience with Object-Oriented Design and Development.
• Experience working with the MVC framework.
• Familiarity with software design patterns and interoperability issues.
• Strong understanding of web application security and authentication mechanisms.
• Demonstrable experience implementing Microsoft Entra ID / Azure AD Identity and Access Management within medium or large-scale web applications.
• Experience with OpenID and modern authentication approaches.
• Experience working across the complete software development lifecycle.
• Proven experience working on medium and large-scale software projects.
• Experience with security considerations for public-facing websites and enterprise applications.
• Strong analytical and problem-solving skills.
• Excellent communication and collaboration skills.

Mandatory Requirements

• Minimum 5 years' experience in software development.
• Proven experience delivering enterprise-level software solutions.
• Strong hands-on experience with C# and .NET.
• Strong experience with Microsoft SQL Server and T-SQL.
• Experience with Object-Oriented Design, MVC, and software design patterns.
• Hands-on experience with Microsoft Entra ID / Azure AD identity and access management.
• Knowledge of OpenID, authentication, authorisation, and web security.
• Experience working across analysis, design, development, testing, deployment, and maintenance.
• Experience working in medium and large-scale software projects.
• Excellent analytical, communication, and problem-solving skills.
• Fluent English, both written and spoken.
• Availability to commence immediately.
• Experience working with public-sector or other highly regulated enterprise environments.
• Experience with large-scale education, training, learning, or related technology platforms.
• Experience supporting bespoke full-stack web-based systems.
• Experience handling application incidents and recommending fixes to recurring issues.
• Experience contributing to technical design and solution architecture activities.
• Strong understanding of secure software development and web application security best practices.
• Experience contributing to technical standards, documentation, knowledge transfer, and continuous improvement.
• Experience taking a senior or lead role across complex software development projects or programmes.
• Experience coordinating the contributions of other technical specialists.
• Relevant ICT, Computer Science, or technology-related degree, or equivalent industry qualifications.