.NET Developer

Kallidus; Lisboa; Hybrid; EUR 55,000 - 90,000; Full time

Benefits offered by this job

27 days annual leave

Hybrid work model

Tech setup provided

Growth & development support

Enhanced family leave

Job summary

Kallidus is seeking a skilled .NET Developer to design, build and maintain scalable backend services and RESTful APIs for a global SaaS platform. You’ll work in an Agile team, collaborating with Product, QA, and Engineering to deliver high-quality software.

Remote-friendly with hybrid approach, you’ll contribute to architecture discussions, code reviews, and performance improvements while ensuring security and reliability across services.

Qualifications

• Commercial experience as a .NET Developer or similar.
• Strong RESTful API design and implementation experience.
• Excellent ASP.NET Core Web API knowledge.
• Relational DB design with SQL Server.
• Experience with API integrations and third-party services.
• Familiarity with cloud-native architectures and microservices.
• Understanding of HTTP, JSON, and modern web tech.
• Experience in Agile environments.

Responsibilities

• Design, develop, and maintain scalable .NET applications and services.
• Build high-performance RESTful APIs to support the SaaS platform.
• Collaborate with Product, QA, and Engineering to translate requirements into solutions.
• Contribute to architecture discussions and technical design decisions.
• Write clean, maintainable, testable code following best practices.
• Develop and maintain API integrations with internal and external systems.
• Support deployment, monitoring, and continuous improvement of apps.
• Troubleshoot production issues and optimise performance.
• Document code and architecture throughout the lifecycle.
• Ensure security, scalability, and reliability standards are met.

Skills

RESTful Web APIs

ASP.NET Core

(.NET)

C#

SQL Server

Azure

Docker

CI/CD

Agile

Microservices

API Gateways

Security Best Practices

Tools

Azure DevOps

Job description

Reporting to: Director Of Software Engineering

Kallidus is a leading SaaS provider of learning, performance, and talent management solutions. Our award-winning platform helps hundreds of organisations worldwide empower their people to perform at their best — from simplifying compliance to driving skills development and measurable business outcomes.

We are a technology company, not just a company that "does technology". We build it ourselves, we own it entirely, and the people who lead that work have real influence over how it evolves. Come build, grow and make a difference!

The Role:

This is an excellent opportunity for a developer who enjoys designing and building robust backend services, APIs, and integrations that power large-scale SaaS applications.

You’ll work as part of a collaborative Agile team, contributing to the development of new features, enhancing existing products, and helping to deliver high-quality software that supports our customers around the globe.

We’re particularly interested in developers who have a strong background in designing, building, and maintaining RESTful Web APIs and who understand how modern distributed applications communicate and scale.

This role can be based out of either our Bristol HQ or our new AI Hub in Lisbon!

Key Responsibilities:

• Design, develop, and maintain scalable .NET applications and services
• Build and enhance high-performance RESTful Web APIs that support our SaaS platform
• Collaborate with Product, QA, and Engineering teams to translate requirements into technical solutions
• Participate in architecture discussions and contribute to technical design decisions
• Write clean, maintainable, and testable code following industry best practices
• Develop and maintain integrations with internal and third-party systems through APIs
• Support the deployment, monitoring, and continuous improvement of applications
• Troubleshoot, debug, and resolve production issues
• Refactor and optimise existing systems to improve performance and maintainability
• Contribute to code reviews and promote engineering excellence within the team
• Create and maintain technical documentation throughout the software development lifecycle
• Ensure solutions align with security, scalability, and reliability standards

Required Skills, Experience and Behaviours

• Commercial experience as a .NET Developer, Software Developer, or Application Developer
• Strong experience building and maintaining RESTful Web APIs using .NET and C#
• Excellent knowledge of ASP.NET Core Web API
• Solid understanding of API design principles, versioning, authentication, and security best practices
• Experience working with SQL Server and relational database design
• Experience consuming and integrating third-party APIs and services
• Knowledge of architectural patterns and modern software design principles
• Familiarity with API-driven and microservices-based architectures
• Understanding of HTTP, JSON, REST, and modern web technologies
• Experience working within Agile development environments
• Strong problem-solving and troubleshooting skills
• Excellent communication and collaboration skills
• High attention to detail and commitment to code quality
• Experience with Azure and cloud-native application development
• Exposure to containerisation technologies such as Docker
• Experience with CI/CD pipelines and DevOps practices
• Knowledge of event-driven architectures and messaging technologies
• Experience with API gateways and service integrations
• Exposure to learning technology, HR technology, or workforce analytics platforms
• Previous experience working within a SaaS or product-led organisation
• Understanding of performance optimisation and scalable distributed systems

What we offer:

• 27 days of annual leave
• Full tech setup
• Support for your ongoing growth & development
• Enhanced Family Leave
• Flexible, hybrid approach to work

Our people are the heart of our success, and diversity is what drives that. Kallidus positively encourages applications from suitably qualified and eligible candidates regardless of sex, race, disability, age, sexual orientation, gender reassignment, region or belief, marital status, pregnancy or maternity.

Diversity brings innovation and creativity through different views, backgrounds, and opinions; as a people-first organisation, it’s crucial that our teams reflect global diversity.

Kallidus is a proud member of the Disability Confident Employer scheme. We work hard to build an explicitly inclusive space where everybody belongs. Kallidus is a supportive, caring, and enjoyable working environment for all our people, and we are committed to furthering the diversity of our teams.