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Sigma SoftwareSS

Middle Full-Stack Software Engineer – AI Voice Systems

Sigma Software Group is a global IT consulting company that provides top-quality custom software development, graphic design, testing, and support services to a wide range of industries.

Sigma Software

Employee count: 1001-5000

Ukraine only

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  • 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.

We are looking for a Middle Full-Stack Software Engineer with strong experience in TypeScript, React/Next.js, and solid working knowledge of backend development with Python.

The ideal candidate is comfortable owning features end to end — from frontend implementation and user-facing flows to backend services, APIs, integrations, and production support. This role is a good fit for an engineer who enjoys working across the stack, solving complex integration challenges, and contributing to a product in the AI communication space.

The position is slightly frontend-leaning, but still requires the ability to read, write, and maintain backend services.

CUSTOMER

The customer is a product company developing a platform for automating customer communications using AI-based solutions.

The team is small, fast-scaling, and operates with a low level of bureaucracy. The role involves direct communication with the customer team and a strong ownership-oriented engineering culture.

The project is in an active development phase. The candidate will work on frontend features, backend services, external provider integrations, and contribute to the ongoing development of the existing platform.

PROJECT

The project is an agentic call center platform that uses Voice and Text AI agents to conduct real customer conversations, automate workflows, and integrate with CRMs and telecom providers.

The platform helps businesses automate customer communication at scale, including bookings, call transfers, CRM workflows, messaging, and routing.

From a technical perspective, the project is interesting because it includes frontend development with React/Next.js, backend services in Python, GraphQL APIs, real-time voice AI workflows, integrations with external providers, MongoDB, Aurora, RabbitMQ, Redis, Docker/ECS, and a future migration toward Kubernetes.

Key Technologies

TypeScript, React, Next.js, GraphQL, Apollo, Python, MongoDB, Aurora / PostgreSQL, RabbitMQ, Redis, Docker, ECS, Kubernetes, AWS, AI/LLM integrations, real-time voice AI.

About the job

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Job type

Full Time

Experience level

Location requirements

Hiring timezones

Ukraine +/- 0 hours

About Sigma Software

Learn more about Sigma Software and their company culture.

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At the heart of Sigma Software Group lies a culture deeply rooted in Scandinavian values, emphasizing mutual respect, transparency, and a minimal hierarchy. This foundation fosters an environment where every voice is heard and valued, empowering our team of over 2000 IT experts to innovate and excel. Since our inception in 2002, our mission has been to build long-term, synergistic relationships not just with our clients, but with our employees as well. We believe that the key to delivering top-quality, value-adding IT services is a team that feels supported, inspired, and driven by a shared passion for finding better solutions. Our culture is one of perseverance, coupled with exceptional client management and strong engineering principles, which has been the cornerstone of our success and sustained growth on the global stage.

Our commitment extends beyond delivering cutting-edge software solutions. We are dedicated to nurturing the growth of the IT ecosystem through our educational platform, Sigma Software University, and fostering the next generation of tech innovators via our corporate venture fund, Sigma Software Labs. This holistic approach reflects our core belief in the power of collaboration and knowledge sharing. We actively encourage our specialists to pursue professional development, offering a continuous education program and a multitude of knowledge-sharing events. This dedication to growth, combined with a flexible work-life balance and a strong sense of community, defines who we are. We are more than just a technology partner; we are a collective of passionate individuals working together to create a better tomorrow, driven by a constant quest for innovation and a commitment to making a positive impact on the world.

Employee benefits

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Discount program

Access to a discount program.

Flexible schedule

Organize your work schedule in a way that suits you.

Remote or office work

You can choose to work from one of our outstanding offices or remotely.

Legal support

24/7 call center for legal advice and urgent lawyer assistance in case of an incident.

View Sigma Software's employee benefits
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Sigma Software

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