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Sigma Software Group

Middle Full-Stack Software Engineer – AI Voice Systems

Lviv, Lviv Oblast, UkrainePosted 4 days ago
Full-timeonsiteMid-Senior Level

Job Description

  • Develop and maintain full-stack features in a production environment.
  • Build user-facing functionality using TypeScript, React, and Next.js.
  • Work with server-side rendering and general Next.js patterns.
  • Build, consume, and maintain GraphQL APIs, ideally using Apollo.
  • Read, write, and maintain backend services in Python.
  • Contribute to API design, data modeling, and service-to-service communication.
  • Support integrations with CRMs, telecom providers, and AI-related vendors.
  • Work with MongoDB and Aurora / PostgreSQL for data storage.
  • Participate in debugging across the stack — from browser DevTools to backend logs.
  • Work with Docker and containerized deployments.
  • Contribute to CI/CD improvements, deployment safety, logging, monitoring, and observability.
  • Help keep production services stable, reliable, and easy to support.
  • Communicate directly with the customer team and take ownership of tasks from start to finish.
  • 3+ years of full-stack engineering experience, preferably with a frontend focus.
  • Experience owning features end to end in a production environment.
  • Good working knowledge of TypeScript.
  • Strong experience with React and Next.js.
  • Familiarity with server-side rendering and general Next.js patterns.
  • Experience working with GraphQL, ideally Apollo.
  • Ability to build and consume GraphQL APIs.
  • Comfortable working with Python: able to read, write, and maintain backend services.
  • General understanding of backend fundamentals: API design, data modeling, and how services communicate with each other.
  • Experience with Docker and containerized deployments.
  • Experience with MongoDB or a relational database such as PostgreSQL / Aurora.
  • Understanding of basic schema design and ability to write reasonable queries.
  • Ability to debug across the stack, from frontend issues to backend logs.
  • Interest in production topics: logging, monitoring, reliability, and service health.
  • Proactive communication and ability to take a task and drive it without constant hand-holding.
  • Comfortable working in a small team with direct customer communication.

WILL BE A PLUS

  • Experience with Python backend services in production.
  • Exposure to messaging systems such as RabbitMQ or similar tools.
  • Experience with Redis or other caching tools.
  • Experience with real-time systems: telephony, WebSockets, streaming, low-latency pipelines.
  • Familiarity with vendor orchestration patterns: fallback routing, provider selection.
  • Any Kubernetes experience, even in dev/staging environments.
  • Experience with AI/LLM, TTS/STT, or voice-related systems.
  • Exposure to security/compliance concepts: SOC 2, secrets management, audit trails.

    PERSONAL PROFILE

    • Proactive and ownership-driven mindset.
    • Comfortable working across frontend and backend.
    • Enjoys solving complex product and integration challenges.
    • Interested in AI-driven communication products.
    • Strong problem-solving skills.
    • Effective communicator in distributed and small teams.
    • Able to work independently and clarify requirements when needed.

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    Middle Full-Stack Software Engineer – AI Voice Systems at Sigma Software Group | Renata