Senior DevOps & Node.js Engineer
Limassol
KTO – Technology /
Full-Time /
Hybrid
Welcome to KTO Group, where innovation drives excitement in iGaming. Founded in 2018 by Andreas Bardun, we’re transforming online gaming with a focus on transparency and player satisfaction.
At KTO.com, we blend the thrill of sports betting with online casino entertainment, tailored to local markets and powered by our proprietary platform for a seamless, personalized experience.
KTO is a rising leader in LATAM, proudly ranked among Brazil’s top 10 iGaming brands. Join us as we set new standards in trust, innovation, and the future of iGaming.
Role Overview
We are looking for a Senior DevOps & Node.js Engineer to take ownership of both our cloud infrastructure and application backend. This is a hands-on role responsible for maintaining, securing, and scaling our iGaming platform. The ideal candidate is equally comfortable writing Terraform modules and debugging Node.js microservices, with strong security awareness given the financial and regulatory nature of the business.
Our platform handles real-money transactions, integrates with third-party wallet and payment providers, and operates in regulated gambling markets. It runs on Google Cloud Platform and consists of 10+ TypeScript/Node.js microservices deployed on Kubernetes through a multi-tenant architecture serving multiple brands.
Key Responsibilities
- Own and maintain the Terraform-managed GCP infrastructure (GKE, Cloud SQL, Memorystore Redis, Cloud CDN, Cloud Armor, VPC networking, Cloud NAT)
- Manage Kubernetes cluster operations — deployments, autoscaling (HPA), ingress routing, secrets management, pod disruption budgets, and network policies
- Design and implement CI/CD pipelines for automated testing, building, and deploying microservices to GKE
- Monitor platform health, configure alerting (uptime, resource utilization, error rates, financial transaction failures), and respond to incidents
- Manage database operations — PostgreSQL administration, backup verification, connection pooling, query performance, and read replica management
- Implement and maintain security controls — Cloud Armor WAF rules, network isolation, TLS certificate management, and secrets rotation
- Plan and execute capacity management, cost optimization, and disaster recovery procedures
- Maintain infrastructure-as-code standards with remote state management, modular Terraform, and environment parity (staging/production)
- Maintain and improve 10+ TypeScript/Node.js microservices built with Express.js, TypeORM, and GraphQL
- Identify and resolve performance bottlenecks — N+1 queries, blocking operations, unbounded queries, and connection pool tuning
- Implement proper error handling and retry logic for financial transaction flows (wallet deposits, withdrawals, multiplayer payouts)
- Address security vulnerabilities — SQL injection, broken encryption, authentication weaknesses, input validation, and missing security headers
- Manage real-time WebSocket services for multiplayer game functionality
- Maintain and optimize the PostgreSQL database — migrations, indexing, query optimization, and archival strategy
- Ensure Redis caching layer is properly configured and resilient
- Work with GraphQL APIs including federation, query cost limiting, and depth/complexity controls
- Remediate identified security findings across infrastructure and application layers
- Implement least-privilege access controls (database users, service accounts, Kubernetes RBAC)
- Ensure encryption standards meet regulatory requirements for financial data handling
- Maintain audit trails and request tracing across microservices
- Support gaming license compliance efforts by maintaining platform integrity, fairness verification systems, and data isolation between tenants
Requirements
- 5+ years in a combined DevOps + backend engineering role
- Strong Node.js (v18+) + TypeScript skills (async/await, event loop fundamentals, production debugging)
- Solid experience with Express.js (REST APIs, middleware patterns)
- Hands-on PostgreSQL expertise (administration, migrations, indexing, query tuning, connection management)
- Working knowledge of Redis (caching, pub/sub, distributed locking, sessions)
- Strong Terraform skills (modules, remote state, workspaces, lifecycle management)
- Proven experience on Google Cloud Platform, especially: GKE, Cloud SQL, Memorystore, Cloud CDN, Cloud Armor, VPC, Cloud NAT, IAM, Cloud Monitoring
- Deep Kubernetes operations knowledge (deployments, ingress, HPA, secrets/configmaps, RBAC, network policies, PDBs)
- Strong Docker experience (building/optimizing images, registries)
- Experience designing and maintaining CI/CD pipelines (GitHub Actions/GitLab CI/Cloud Build or similar)
- Strong security fundamentals: OWASP Top 10, secure coding, encryption basics (AES-GCM, HMAC-SHA256), JWT, WAF concepts
- Monitoring/observability experience (Prometheus/Grafana and/or GCP Cloud Monitoring, dashboards + alerting)
- Proficient with Git workflows (branching, PRs, code reviews)
- Comfortable with Linux administration and troubleshooting
- Ability to operate in regulated / financial-transaction environments (reliability, auditability, incident response)
At KTO, diversity isn't just a buzzword – it's our strength. We're all about creating an inclusive environment where everyone feels valued and empowered. Together, we're not just working on projects – we're making a real impact in our communities. Join us in celebrating diversity and driving meaningful change!
We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.
