Senior Backend Engineer (Microsoft 365 / Graph API / Exchange Online)

About the Position

Artificial Intelligence becomes truly valuable when it connects seamlessly with the tools people already use every day.

That’s exactly what this role is about.

We’re building a new engineering team responsible for creating intelligent backend services that integrate Agentic AI capabilities directly into the Microsoft ecosystem, enabling secure, scalable, enterprise-ready automation.

If you enjoy solving complex integration challenges and building robust cloud services, this opportunity is for you.

What you’ll be building

You’ll be responsible for developing backend services that connect Azure OpenAI with Microsoft 365 through Microsoft Graph API.

The first solution is an Agentic Email Orchestration Service capable of understanding, processing and orchestrating enterprise email workflows.

You’ll also contribute to future reusable services supporting our broader Agentic Case Management platform.

Responsibilities

• Develop backend services supporting Microsoft 365 integrations.
• Design secure integrations with Microsoft Graph API.
• Build Exchange Online email workflows.
• Develop scalable APIs using Python and FastAPI where required.
• Integrate Azure OpenAI capabilities into enterprise solutions.
• Collaborate with architects and backend engineers.
• Design reusable integration components.
• Ensure security, reliability and scalability.
• Deliver production-ready software through short delivery iterations.
• Contribute to architecture and engineering discussions.

Requirements

Required

• Strong experience with Microsoft Graph API.
• Experience integrating Microsoft 365 services.
• Exchange Online expertise.
• Experience developing backend services.
• Python experience is highly appreciated.
• FastAPI or similar backend frameworks.
• Azure experience.
• REST API design.
• Authentication (OAuth2 / Entra ID).
• Excellent English communication skills.

Nice to Have

• Azure OpenAI.
• APIM.
• AI Agents.
• Event-driven architecture.
• Microservices.
• Azure Functions.
• Docker.
• Kubernetes.

Our Engineering Culture

We believe modern software engineering combines strong technical fundamentals with intelligent use of AI.

We’re looking for engineers who embrace automation, continuously improve their craft, and use modern GenAI tools to increase delivery quality without compromising engineering standards.

Why Join This Team?

Because you’ll:

• Join a newly formed engineering team.
• Build enterprise AI integrations.
• Work on Microsoft technologies at scale.
• Design reusable services instead of one-off integrations.
• Help shape the architecture of future AI-powered products.
• Work alongside experienced engineers in a highly collaborative environment.

About the Company

At Arnia, we are a diverse and passionate team of software development engineers, quality assurance engineers, business analysts, system administrators, and managers, united by our shared dedication to creating high-quality software solutions and delivering exceptional services to our valued customers and partners.

We believe in customer satisfaction as being the single most important goal we want to achieve in everything we do. But we also believe that we can reach this goal while having fun at work, making friends, and enjoying working together. We have game evenings, nights out and team building events to help us know each other better and spend quality time together. Also, we have a flat organization, with no unnecessary hierarchies and where you reach the management easily.

In Arnia you will meet very skilled software engineers with rich academic backgrounds, with passion for innovation and continuous education, self-driven and oriented toward results. At the same time, they are people with high sense of humour, fun and informal, that value friendship, trust and a nice working environment.

Excellence is achieved step by step, it is a journey we always take together as a team and as a modern organization.

We recognize the value of each individual, we value diversity and we support your development career – your success is our success! We take pride in helping our people to develop their career, continuously improving their skills and their technical knowledge and to fully reach their own development goals.

People are different, they are coming from various cultures and are motivated by different things:

• The financial interests
• The career development plan
• The technologies and the projects
• The work-life balance
• The opportunities to travel abroad

Why Arnia?

We recognize people’s diversity and we try to meet everyone’s goals.

• Game Evenings
• Nights Out
• Team Buildings
• Trainings

Arnia encourages you to pursue your own interests, projects and ideas – passion can turn small things into big things – we want to be part of your own individual success. Let us know your ideas and your personal interests and we will find a way to support you.

We Offer

• Competitive Compensation Packages
• Flexible Working Hours
• Job Rotation
• Performance Bonuses
• Medical Benefits
• Attractive Projects
• International Work Experience
• Referral Program
• Learning Through Arnia Academy

How to Apply

If you are interested in this opportunity, please apply through our career page.