Remote - Principal Software Engineer

What We're Looking For

• 10+ years of backend software engineering experience, including 3+ years in a hands-on technical leadership role (Principal / Tech Lead / Architect)
• A product mindset: you connect technical decisions to business impact
• A team player with excellent communication skills, who’s not afraid to touch every aspect of modern software product development (e.g. quality, documentation, customer-facing technical discussions)
• Proven experience designing and building systems from scratch in a product environment - including reliable, concurrent, thread-safe services
• Strong hands-on skills in a modern backend language (Go or Python preferred) and the ability to pick up new languages and technologies quickly
• Real, hands-on experience using AI coding agents across the development lifecycle - you know their strengths, their failure modes, and how to guide them to high-quality results
• Solid grounding in cloud environments and modern development practices (AWS, GCP, or Azure)

Nice to Have

• Familiarity with AI security challenges (prompt injection, model leakage, adversarial attacks)
• Experience integrating AI/LLM capabilities into real-world production systems - beyond out-of-the-box API calls (tuning, customization, evaluation)
• Experience with ML workflows (training, deployment, inference) or tools such as LangChain, Hugging Face, or provider SDKs
• Background in application security, cloud security, or DevSecOps

Why Mend.io

Mend.io is an established leader in application security - an AI-native AppSec platform trusted by enterprises worldwide. Mend AI operates like a startup inside that stability: a small, senior team with a greenfield mandate, direct access to decision-makers, and a product in one of the fastest-moving spaces in security. Our Poland team is a core engineering site, not an outsourcing arm - architecture happens where the engineers are.

Mend.io is an equal opportunity employer. All aspects of employment are based solely on merit and professional competence, and we're committed to a diverse, inclusive workplace where everyone can do their best work.