Senior Software Engineer

Svitla Systems Inc. is looking for a Senior Software Engineer (Node.js) for a full-time position (40 hours per week) in Europe. Our client is a software company providing a B2C ecommerce identity and marketing data platform.

Role Overview: The team is seeking a Senior Software Engineer to own and evolve our API gateway and tracking layer, with a strong focus on JavaScript-based event pipelines, pixel technologies, and Lua-powered gateway extensions using API7 / Apache APISIX.

This role is critical to ensuring accurate, low-latency site tracking, reliable event ingestion, and high-fidelity telemetry across browser, server, and API boundaries.

Occasional travel to Vienna is a must-have option.

Requirements:

• 5+ years of experience in platform, backend, or tracking-focused engineering roles.

• Strong experience with JavaScript / Node.js in production systems.

• Proven experience designing/operating an API gateway or edge layer (core responsibility, not incidental).

• Lua development in NGINX / OpenResty / APISIX-style environments (plugins/middleware).

• Experience with high-volume, low-latency event ingestion and/or request routing.

• Experience designing and operating pixel-based tracking systems.

• Solid understanding of browser internals, HTTP, cookies, CORS, and security.

• Familiarity with cloud-native infrastructure (AWS/GCP, Kubernetes).

• Excellent spoken and written English.

Nice to have:

• Experience with CDPs, analytics platforms, or attribution systems.

• Server-side tagging or GTM Server-Side experience.

• Knowledge of privacy frameworks (consent, first-party data strategies).

• OpenTelemetry or real-time streaming pipelines.

Responsibilities:

• Design and operate an API7 / Apache APISIX gateway layer for high-volume tracking and event ingestion.

• Develop custom Lua plugins to: Capture, normalize, and enrich pixel and API events; Perform edge-side validation, filtering, and routing.

• Build and maintain JavaScript / Node.js services that: Receive and process tracking events; Support pixel endpoints, event batching, and retries; Interface with downstream analytics and data platforms.

• Instrument tracking pipelines with observability tooling (OpenTelemetry, Prometheus, Grafana, ELK, SumoLogic).

• Ensure compliance and reliability across tracking infrastructure (latency, completeness, uptime).

• Partner with product, data, and privacy teams to evolve tracking strategies.

• Participate in on-call rotations, incident response, and postmortems.

• Implement and maintain pixel-based tracking systems, including: First-party and third-party pixel architectures; Cookie and localStorage handling; Browser-to-server event flows.

We offer:

• US and EU projects based on advanced technologies.

• Competitive compensation based on skills and experience.

• Regular performance appraisals to support your growth.

• Flexibility in workspace, either remote or our welcoming office.

• Bonuses for article writing, public talks, and other activities.

• Generous time off, including vacation, national holidays, sick leaves, and family days.

• Personalized learning programs tailored to your interests and skill development.

• Free tech webinars and meetups organized by Svitla.

• Regular corporate online activities.

• Awesome team and a friendly, supportive community!