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Senior Frontend Engineer (JavaScript; Microsoft 365)

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Senior Frontend Engineer (JavaScript; Microsoft 365)

You will contribute to the development of Microsoft 365 extensions that deliver seamless, real-time, low-latency functionality inside Word, Outlook, and related applications.

award icon Salary: 5,800 - 6,250 EUR/per month
award icon Hybrid from Prague office (3 days/week onsite)
award icon Full-time position, long-term
award icon B2B Contract

We are seeking a highly skilled Senior Frontend Engineer with an interest in building Office-based plugin experiences to join a growing technology scale-up specializing in document automation and workflow digitization. The company builds advanced platforms used by enterprise legal teams and corporate organizations to draft, negotiate, and manage complex documentation efficiently and securely.

Requirements

checked icon 5+ years of experience with JavaScript and TypeScript in production environments
checked icon Solid frontend experience with modern frameworks like React or Vue.js
checked icon Experience with Office Add-ins (Office.js) and Microsoft Graph is a plus
checked icon Experience building web applications with APIs, OAuth2 flows and secure authentication
checked icon Strong skills in debugging, optimizing UI performance, and solving complex technical challenges
checked icon Familiarity with cloud platforms, AI/ML services (e.g., Azure, OpenAI), and automated testing frameworks (Jest, Playwright)
checked icon Knowledge of CI/CD pipelines for plugin deployment
checked icon Understanding of accessibility, UX principles, and UI performance optimization
checked icon Background in SaaS, workflow, or document automation products is a bonus

Responsibilities

checked icon Develop and enhance Office extensions that improve productivity and integrate seamlessly with Microsoft 365 apps.
checked icon Collaborate with AI teams to incorporate smart suggestions, content generation, and automation features.
checked icon Write clean, maintainable, and scalable code that performs reliably in enterprise-grade environments.
checked icon Troubleshoot, optimize, and improve performance across plugin and UI layers to ensure smooth user experiences.
checked icon Work closely with cross-functional teams: product, design, AI, and backend, to deliver high-quality features on time.
checked icon Participate in technical planning, review architectural decisions, and provide guidance on engineering standards.
checked icon Implement and maintain best practices for testing, CI/CD pipelines, and deployment of Office Add-ins.
checked icon Experiment with new technologies and evaluate their potential to enhance user workflows or efficiency.

Please include GDPR consent

I acknowledge, that by submitting the form I give consent for my personal data included in the application to be processed by DevsData LLC for the purposes of current and future recruitment processes in accordance with Art. 6 paragraph 1 letter a of the Regulation of the European Parliament and of the Council (EU) 2016/679 of 27 April 2016 on the protection of natural persons with regard to the processing of personal data and on the free movement of such data, and repealing Directive 95/46/EC (General Data Protection Regulation).
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Senior Frontend Engineer (JavaScript; Microsoft 365)

5800 - 6250 EUR net/month - B2B
net/month - B2B
5800 - 6250 EUR
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DevsData LLC needs the contact information and your personal data to be processed for the needs of a recruitment process. For information on how to withdraw your consent, as well as our privacy practices and commitment to protecting your privacy, check out our Privacy Policy.
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What will be your next steps?

1

Quick non-technical
conversation

It's all about communication! We want to see how your social and decision-making skills can contribute to efficient team performance.

2

60 to 90 minutes technical
interview

During the technical interview, we want to assess the candidate's specific knowledge, skills, and abilities in relation to our client's needs.

3

Client
interview

The problem-solving challenge is all about using logic and creativity to make sense of a situation and develop an intelligent solution.

4

Offer

You did it! After managing to get through all of these rigorous stages, it's finally time to recommend you directly to our clients.

1

Quick non-technical
conversation

It's all about communication! We want to see how your social and decision-making skills can contribute to efficient team performance.

2

60 to 90 minutes technical
interview

During the technical interview, we want to assess the candidate's specific knowledge, skills, and abilities in relation to our client's needs.

3

Client
interview

The problem-solving challenge is all about using logic and creativity to make sense of a situation and develop an intelligent solution.

4

Offer

You did it! After managing to get through all of these rigorous stages, it's finally time to recommend you directly to our clients.
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