Senior Backend Engineer for Test Automation (AI)

Location: Prague or Bratislava; on-site or hybrid. Relocation to one of the employing entities is required. Candidates must already be authorized to work in the EU and must not require visa or work permit sponsorship.

Company

hirify.global is a game development company building an unannounced cross-platform Strategy/MMO title in partnership with a top-five Western mobile game publisher.

What you will do

• Design, develop, and evolve systems that validate and improve the performance, scalability, and reliability of AWS backend services.
• Define service-level expectations for latency, throughput, and error rates, and validate them under realistic conditions.
• Build frameworks and tooling to simulate multi-service interactions, high concurrency, network variability, and other production scenarios.
• Develop load, stress, and endurance testing systems integrated with CI/CD pipelines to detect regressions before production.
• Analyze metrics, logs, and distributed tracing to identify bottlenecks and improve backend services.
• Define testing strategies, tooling, and best practices across feature teams while leveraging AI-assisted and agentic development workflows.

Requirements

• 5+ years of experience as a software engineer working with backend systems, distributed systems in the public cloud, or relevant areas, with strong interest in testing and performance testing.
• Professional experience building and operating highly available, scalable backend systems such as MMO game servers, high-traffic services, or real-time applications.
• Experience with Python, including asynchronous programming, concurrency, and performance considerations.
• Strong understanding of distributed systems, including service-to-service communication, event-driven architectures, failure modes, resilience patterns, and stateful versus stateless architectures.
• Experience designing highly scalable, low-latency systems using Redis, DynamoDB, or similar technologies, plus strong REST/gRPC API design skills.
• Experience with AWS, Docker, CI/CD pipelines, automated testing, and infrastructure automation.
• Experience using Datadog, logs, and tracing to analyze and debug system behavior.
• Hands-on experience with AI-assisted development tools such as GitHub Copilot, Codex, or Claude Code, and understanding of agentic engineering workflows.

Nice to have

• Experience with K6 or Locust load-testing frameworks.
• Understanding of SRE concepts including SLA, SLO, and error budgets.
• Experience load-testing messaging systems such as NATS.
• Experience with relational databases such as MySQL.
• Familiarity with Infrastructure-as-Code, preferably Terraform.
• Understanding of VPCs, subnets, security groups, load balancing, and cloud networking.
• Familiarity with Kibana or Datadog for log querying and dashboards.

Culture & Benefits

• Full-time employee salary and company benefits.
• Modern offices in an accessible location.
• Company hardware, including test devices.
• Work on a world-class game IP with a large international team.
• Collaborative work with an experienced team of game makers.

Hiring process

• Apply through the provided application form.
• Foreign candidates may apply, subject to the EU work authorization and relocation requirements.