We are looking for a Middle Software Developer with a strong Python background, solid experience with production services, and willingness to work with or gradually move toward TypeScript.
The ideal candidate is not just a code executor, but an engineer interested in complex integrations, service reliability, real-time workflows, AI/LLM integrations, and infrastructure transformation.
This role is a good fit for someone who wants to work in a small fast-scaling team, take ownership, and contribute to the core platform rather than just complete tickets.
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 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 Python to TypeScript migration, multi-LLM orchestration, real-time voice AI, low-latency workflows, MongoDB, Aurora, RabbitMQ, Redis, Docker/ECS, and a future migration to Kubernetes.
Key Technologies:
Python, TypeScript (Node.js), MongoDB, Aurora (RDS), RabbitMQ, Redis, Docker, ECS, Kubernetes, AWS, multi-LLM orchestration, real-time voice AI
Job Description- Develop and maintain services ensuring clean, testable, well-documented code
- Build and improve APIs and services orchestrating agent workflows across LLM/TTS/STT vendors
- Implement resilient patterns for external provider calls (retries, timeouts, fallbacks, rate limits, circuit breaking)
- Integrate with CRMs and telecom providers, enabling bi-directional sync and workflow triggers
- Maintain internal abstractions/adapters for consistent and extensible integrations
- Work with MongoDB and Aurora for data storage and relational guarantees
- Use RabbitMQ for asynchronous workflows and Redis for caching and ephemeral state
- Participate in migration planning from Docker + ECS to Kubernetes
- Contribute to CI/CD improvements, deployment safety, and observability
- Engage in incident response and operational reliability improvements
- 3+ years of backend engineering experience with hands-on ownership of production services
- Strong proficiency in Python
- Good understanding of backend engineering fundamentals: APIs, data modeling, and basic distributed systems concepts
- Willingness to work with TypeScript or eagerness to learn it
- Experience with Docker and containerized services
- Practical experience with MongoDB or a relational database such as PostgreSQL / Aurora
- Understanding of basic schema design and query optimization
- Familiarity with messaging systems such as RabbitMQ or similar tools
- Experience with Redis for caching, rate limiting, or ephemeral state
- Strong debugging skills
- Interest in operational topics: logging, monitoring, service reliability
- Proactive communication and ability to take a well-scoped problem and drive it to completion
- Ability to work in a small team with direct customer communication
WILL BE A PLUS
- 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
- Exposure to security/compliance concepts: SOC 2, secrets management, audit trails
- Experience with AI/LLM, TTS/STT, or voice-related systems
PERSONAL PROFILE
- Proactive and ownership-driven mindset
- Enjoys solving complex integration challenges
- Interested in cutting-edge AI voice systems
- Strong problem-solving skills
- Effective communicator in distributed teams
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What We Do
Sigma Software Group, an award-winning and trusted IT partner, has been serving customers for over 21 years, providing comprehensive IT solutions to various businesses, ranging from startups to established software product houses. As one of Europe's substantial IT consultancies, it brings together a dedicated workforce of over 2,100 professionals in 40 offices across 19 countries. With a diverse client base, including more than 300 enterprises, including Fortune 500 stalwarts, Sigma Software Group is a preferred choice for developing solutions that help businesses create cutting-edge products while meeting their unique needs. Sigma Software Group operates as a dynamic ecosystem of tech companies, offering 25 ready-to-implement innovative products and 40+ value-added services. Furthermore, Sigma Software Group is committed to fostering innovation through initiatives such as the Sigma Software Labs business incubator, Sigma Software University, the SID Venture Partners VC Fund, UA Tech Network, Techosystem, the European Business Association, and other collaborative efforts. Since 2015, Sigma Software Group has consistently earned recognition on the IAOP's prestigious World's Top 100 Outsourcing list. The company's accomplishments have also been acknowledged by prominent global media outlets such as Forbes, CNBC, The Times, and Reuters
