Software Engineer

Rate: 90 – 120 PLN/hour (B2B)

We are looking for an experienced Software Engineer to join Flix on a freelance/service agreement basis (B2B contract) . This is a contractor engagement for a seasoned engineer who wants to work on impactful, hands-on engineering challenges.

Scope of Services

Build and scale the customer service platform that handles millions of passenger conversations across markets — from AI-powered chatbots and voice agents to help center and knowledge base tools. We run a polyglot stack (Python, TypeScript, Terraform) on AWS, integrating Twilio, Cognigy, Kafka and AWS Bedrock. We ship continuously and own our services end-to-end, from Terraform to production.

About the Engagement

Design, build and maintain Python (FastAPI) backend services and TypeScript/React frontends across the CS platform

Take greenfield products from concept to production — make architectural calls, prototype, validate, and iterate under uncertainty

Develop and extend Twilio Functions (JavaScript) for voice/IVR and webchat flows

Manage the infrastructure as code with Terraform (HCL) on AWS — you build it & deploy it

Integrate third-party and AI platforms: AWS Bedrock, Twilio, Cognigy, LiteLLM, Kafka

Apply AI to your engineering practice — use and help improve our internal AI tooling to ship faster and raise quality

Instrument and monitor services (Datadog, event forwarding, alerting) and respond to production issues

About You

2–4 years building production software

Strong in Python (FastAPI or similar) and comfortable in TypeScript/JavaScript (React a plus)

Hands-on with AWS and infrastructure-as-code (Terraform)

Solid Git workflow, CI/CD, and containerized services (Docker)

Strong ability to navigate vague or shifting requirements — a bias for action, comfort making decisions with incomplete information, and the judgment to avoid analysis-paralysis

Pragmatic, ships iteratively, communicates clearly

Curious about and comfortable working with AI tooling in day-to-day development

Preferred Skills:

Experience building products from scratch (0→1) in a fast-moving team

Conversational AI / chatbot / IVR experience (Twilio, Cognigy, DialogFlow)

LLM / GenAI integration (Bedrock, RAG, MCP servers)

Event streaming (Kafka) and observability (Datadog)

Customer-service or contact-center domain exposure

Collaboration Model

Cooperation based on a service agreement (B2B/freelance contract), not an employment contract

You will operate as an independent contractor, responsible for delivering agreed services and submitting invoices

Location: open for contractors based in Poland