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Traffic Label

4,4

Senior Java Developer

Prague

About Traffic Label

Traffic Label is a fast-growing, data-driven technology company operating in the iGaming and affiliate marketing space, building scalable products focused on performance, analytics, and automation across global markets.

Role Overview

As a Senior Java Developer, you will play a key role in building and scaling high-performance backend services within a complex, data-driven environment. You will contribute to architecture decisions, system reliability, scalability, and security across our platforms, while working closely with cross-functional teams in a collaborative and fast-paced environment.

This role combines hands-on backend development with system design, performance optimisation, and technical leadership.

Key Responsibilities

  • Build scalable, testable backend solutions independently from requirements through to production deployment

  • Own services end-to-end and guide complex features through the full development lifecycle

  • Integrate third-party services according to business and technical requirements

  • Collaborate closely with Backend, Frontend, QA, and Infrastructure teams

  • Contribute to architecture discussions and help shape the technical roadmap

  • Mentor team members on best practices, troubleshooting, and system design

  • Monitor, profile, and optimise application and database performance

  • Design and execute high-load performance testing scenarios

  • Work on complex SQL tasks and performance optimisation using PostgreSQL

  • Handle large-scale datasets with a focus on scalability and reliability

  • Troubleshoot production issues using logs, metrics, alerts, and monitoring tools

Skills & Experience

  • Strong commercial experience with Java Core and Spring Framework / Spring Boot

  • Proven experience designing scalable systems using RDBMS and SQL

  • Hands-on experience with Docker and Kubernetes

  • Strong understanding of JSON, JWT, HTTP(S), REST APIs, and WebSockets

  • Practical experience with Netty and non-blocking I/O

  • Experience working with logging, monitoring, profiling, and alerting tools

  • Strong debugging and problem-solving skills

  • Good understanding of system security best practices

  • Intermediate English level or higher for international collaboration

  • Experience working with high-load systems and performance optimisation

  • Familiarity with technologies such as Kafka, GCP, Elasticsearch, Flyway, Grafana, and Kubernetes-based environments

What We Offer

  • Full remote work flexibility

  • Generous paid time off including vacation, sick leave, and public holidays

  • Strong growth and career development opportunities

  • Opportunity to work on scalable, high-performance systems using modern technologies

  • Collaborative, international, and fast-moving environment

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  • PDG : Oded Keinan
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