Senior Software Engineer

14 hours ago

Prague, Hlavní město Praha, Czech Republic OpenVPN Full time 80,000 - 180,000 per year

We're seeking a Senior Software Engineer to help build and evolve the Gateway, the edge enforcement and routing component of our AI-driven Zero Trust Network Access (ZTNA) platform.

The Gateway is central to the architecture, responsible for real-time policy enforcement, DNS aliasing, and risk-aware access control across multi-tenant environments.

You'll design and develop secure, high-performance, distributed systems that make the overlay network resilient, intelligent, and autonomous — whether deployed on-prem, in the cloud, or at the edge.

Responsibilities
  • Design and build services powering Gateway nodes — including DNS proxy, firewall rule orchestration, policy enforcement, and device posture validation.
  • Collaborate with the Controller (back-end) and AI teams to enable adaptive, AI-driven access policies.
  • Engineer and optimize real-time communication (gRPC/REST/WebSockets) between Gateways, Connectors, and the Controller.
  • Develop observability and telemetry pipelines for Gateway nodes — logs, metrics, traces.
  • Contribute to the Gateway clustering model, ensuring scale-out routing, load balancing, and fault tolerance.
  • Collaborate closely with the Architects and DevOps team to align with CipherScale's reference architecture and deployment blueprints.
  • Participate in design reviews, architecture discussions, and end-to-end testing (performance, resilience, and compliance).

  • Responsible for Quality of the Code - Write and maintain unit, integration, end-to-end, performance tests using AI, scripts, and code quality check tools;

  • 5+ years of software engineering experience, designing and deploying distributed systems at scale.

  • 3+ years of hands-on experience with Go (Golang), including concurrency, memory management, networking, and performance tuning.
  • Deep understanding of network-level protocols and enforcement (TCP/IP, UDP, DNS, TLS, iptables/nftables, conntrack).
  • Proven experience building multi-tenant, security-sensitive systems with strict SLA and HA requirements.
  • Familiarity with authN/authZ protocols (OAuth 2.0, OpenID Connect, JWT, SMAL, Certificates) and risk-based access control.
  • Experience building and managing systems using Docker, Kubernetes, ArgoCD, and CI/CD pipelines.
  • Strong understanding of observability patterns — metrics, distributed tracing, and log pipelines.
  • Proven ability to work cross-functionally with architecture, AI, and infrastructure teams in a remote-first and distributed environment.
Nice to Have
  • Previous experience with NodeJS, Typescript, Javascript
  • Background in VPN technologies, access management, or cybersecurity
  • Experience with policy engines (e.g., OPA, Cedar)
  • Familiarity with Cloudflare (e.g., Workers, DNS, WAF)
  • Exposure to SaaS infrastructure and Kubernetes orchestration
  • Experience scaling high-traffic, production-grade systems
  • Prior experience in a startup environment
  • BSc/MSc in Computer Science, Engineering, or related field

Our philosophy is that we are a small, closely-knit team and we care deeply about you:

  • Competitive pay rates
  • Fully remote work environments
  • Self-managed time off

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