Principal Engineer (Architect)

Who We Are

DefSecIntel Solutions is freedom defenders’ partner in surveillance and control.

Estonian TOP1 Innovator DefSecIntel Solutions' combat-proven mobile autonomous surveillance systems and C-UAS with AI-powered technology are redefining the landscape of border security and defence.

Our technologies play a vital role in combating cross-border smuggling, illegal border crossings and countering hostile drones. Notably, our systems are deployed in Ukraine, supporting the UAAF in its fight against russian aggression.

We work closely with global prime contractors and actively participate in international defence, border security, and force protection programs. DSI is a recognized partner of international organizations such as the EU and NATO, contributing to security and defence R&D programs, including the European Defence Fund.

With over 100 employees and operations headquartered in Tallinn, Estonia, DSI operates on a global scale.

Our Excellence Has Been Recognized With Numerous Awards, Including

• TOP1 Innovator 2024
• TOP1 DefenceTech Company
• TOP2 Most Competitive Estonian Energy and Manufacturing Company
• TOP3 Exporter
• The Best Estonian Defence Company 2023
  
  

We are looking for a Principal Engineer (Architect) to provide technical leadership and shape the future of our software platforms. This role ensures that our systems are scalable, modular, and future-ready, while serving as the architectural authority across teams. You will bridge silos, set clear standards, and define the long-term technical vision that enables the delivery of reliable, high-performing solutions. At the end of the day you will bring real life impact on the frontlines to save real lives.

Join us in shaping the future of defence technology and making a more secured world.

What You Will Be Doing

• Define and evolve system architecture to ensure scalability, modularity, performance, and adaptability to future needs
• Translate business and product requirements into clear, practical technical designs and documentation
• Collaborate with cross-functional teams (engineering, product, operations) to align technical decisions with strategic goals and ensure smooth system interoperability
• Evaluate and integrate diverse sensors and hardware (cameras, radars, ROS devices) to ensure reliable operation, data handling, and communication in challenging field conditions with limited connectivity
• Establish and uphold best practices in architecture, coding standards, integration, and security across teams
• Mentor and guide engineers in system-level thinking, modern architecture patterns, and integration practices
• Drive continuous improvement by reviewing current architecture, identifying bottlenecks, and leading scalability, reliability, and resilience initiatives
  
  

What We Are Looking For

• Proven expertise in designing and implementing complex, distributed systems architecture
• Strong knowledge of modern architecture patterns (e.g., microservices, event-driven, cloud-native, modular systems)
• Hands on experience in implementing, coding and reviewing the code is required
• Solid background in software engineering with the ability to deep-dive into technical challenges
• Experience in API and integration design, with emphasis on scalability and reliability
• Strong communication skills to convey complex concepts to diverse stakeholders
• Ability to balance innovation with operational stability in decision-making
  
  

What We Offer

• Support our mission to create a safer and more secure world
• Opportunity to work alongside talented individuals and participate in the creation and development of innovative solutions and technologies
• Annual €1000 budget for training, conferences, and development opportunities to advance your skills
• €1000 referral bonus for helping us grow our team
• Stebby sports allowance of 150€ per quarter
• Mental health support and consulting via the Meliva platform
• Three health days per year to focus on personal care
• Free parking for employees
• Social activities and team event
  
  

DefSecIntel Solutions is committed to supporting freedom defenders with next-generation surveillance and counter-UAS capabilities. By harnessing AI-assisted technology, we are building mobile autonomous systems that set new standards in security and resilience.

DefSecIntel Solutions is driven by a team with extensive experience in security and defence. Today, we are an international company with a dedicated team of over 100 employees. Our strong engineering competence spans across hardware, software, AI model development, and integrations with external partners. The company’s headquarters and main production facilities are located in Tallinn, Estonia, supported by manufacturing and a maintenance hub in Ukraine, as well as a presence in Germany, Poland, and Romania.