Tech Lead (Node.js)

⭐️ CoreStar is a dynamic technology company supporting partners in heavy-load industries with high-performance solutions.

People management and sprint delivery remain with Team Leads / Engineering Managers; product priorities remain with Product Project overview: We build a high-load in-house platform for third-party integrations, real-time data processing, and reporting.

Ability to influence without reporting authority, mentor engineers, and explain technical trade-offs to engineering and business stakeholders in English. 📌 Benefits: 🏝 24 working days of paid annual leave 🤝 6 days of paid sick leave 🖊 Official employment 📄 Medical insurance ☕️ Coffee zone with fruit & snacks available in the office 🥗 Corporate Lunch provided by the company 💪 Gym and sports classes 🙌 Healthy and friendly work atmosphere 📚 Greek and English language classes (partially covered) Join us and be one of the Core Stars! ⭐

About corestar

Our expert teams bring a startup-driven mindset, focusing on innovation, collaboration, and efficiency in every project.

Responsibilities

• At CoreStar, you’ll have the opportunity to grow your skills, tackle exciting challenges, and directly contribute to impactful products.
• The Tech Lead owns technical direction and platform health across teams.
• Coding agents are part of everyday engineering, and we’re building an internal AI product on top of company knowledge. 📌 Key Responsibilities: Own platform architecture across services, data flows, and integrations, balancing reliability, performance, security, and ease of change.
• Set performance and capacity targets.
• Validate critical designs through prototypes, benchmarks, and load testing.
• Establish engineering standards, testing practices, and review criteria.
• Review major technical decisions and build teams’ ability to apply these standards independently.
• Improve observability and incident diagnosis so engineers can investigate production issues beyond the services they authored.
• Lead adoption of coding agents across teams: define delegation and verification practices, coach engineers, and measure improvements in delivery speed and quality.
• Build and maintain shared agent instructions, skills, workflows, and MCP integrations, with clear ownership and maintenance standards.
• Prioritize technical debt, reliability, and performance work, making the business impact explicit and aligning execution with Team Leads.
• Stay hands-on through production code, proofs of concept, pairing, and technical reviews.
• Develop engineers and strengthen review practices across teams. 📌 Requirements: Experience owning technical direction across multiple teams, with architectural decisions taken to production and clear reasoning about their trade-offs.

Requirements

• Deep production experience with Node.js and TypeScript, including runtime behavior, concurrency, profiling, and performance optimization.
• Experience designing and operating distributed systems under load, including service boundaries, consistency, failure handling, and third-party integrations.
• Experience with MySQL , MongoDB, Redis / Valkey, and message brokers such as NATS or Kafka, including data modeling, query optimization, migrations, and delivery guarantees.
• Practical experience with automated testing, CI/CD, Docker, Kubernetes, cloud infrastructure, observability, and incident response.
• Hands-on experience shipping with coding agents and building reusable agent tooling adopted by other engineers.
• Sound judgment about agent limitations, verification, cost, and access to company data.