Full-Stack Software Engineer

Who we are:

At DefSecIntel Solutions, we protect what matters by building systems that operate where failure is not an option.

We deliver combat-proven, end-user-driven defence and security solutions for Europe’s border security, defence, and critical infrastructure protection. Our platforms are designed for real operational environments and are already trusted in the field.

We develop, manufacture, and integrate mobile autonomous surveillance systems, unmanned surface vessels, and counter-UAS solutions, all connected through AI-powered command-and-control.

With a talented team of 70+ people, DefSecIntel is headquartered in Tallinn, Estonia, with additional manufacturing and maintenance capabilities in Ukraine.

We work closely with leading international partners including the EU and NATO, and contribute to major defence R&D programmes such as the European Defence Fund.

Join us to build mission-ready systems for today’s needs and tomorrow’s challenges, and help shape the future of Europe’s security.

We are looking for a Full-Stack Engineer to join our Server Team and help build and evolve the C2 web-service ecosystem behind our products, working across backend and frontend services on areas such as real-time data, maps, system integrations, APIs, and performance. You’ll work in a small, experienced team with significant ownership, using technologies including Node.js, TypeScript, Svelte, and GraphQL.

What you will be doing:

• Develop and maintain features across our Node.js, Svelte and GraphQL stack

• Build functionality involving map rendering, data visualisation, system integrations and connected devices

• Help standardise APIs and data exchange between systems and improve application performance

• Design solutions, document feature data flows and architecture, and ensure new functionality is well tested

• Investigate production issues using system data and continuously improve the codebase, architecture and development processes

• Collaborate closely with Product, Platform and QA, gathering information and agreeing on solutions across teams

• Take increasing ownership of features and initiatives, contribute actively to technical discussions, and over time help drive architectural improvements and lead smaller development efforts

What we are looking for:

• Strong hands-on experience with Node.js and Express.js, with solid JavaScript/TypeScript fundamentals

• Experience working with non-relational databases, ideally MongoDB

• Good knowledge of HTML/CSS and experience with a modern frontend framework such as React, Vue, Angular, or similar

• Practical experience with Docker, Git, unit testing and end-to-end testing

• The ability to work independently, make sound technical decisions, challenge ideas constructively, and communicate clearly with both technical and non-technical colleagues

• A proactive, quality-focused mindset and willingness to learn unfamiliar technologies and problem spaces

• Familiarity with AI-assisted development tools and using them effectively in your workflow

Nice to have: experience with Svelte, GraphQL, Tailwind CSS, real-time applications, map engines such as Leaflet or MapLibre GL, and monitoring tools such as Prometheus/Grafana.

What we offer:

• Meaningful work that supports our mission to create a safer and more secure world

• The opportunity to work with a talented team and contribute to the development of innovative technologies and solutions

• Flexibility in how and where you work, depending on role and project needs

• Opportunities for professional growth and skills development as the company and projects evolve

• Recognition for helping grow the team through employee referrals

• A focus on employee well-being, including access to health- and sports-related benefits

• Social activities and team events that strengthen collaboration and team spirit