Software Engineer

City: Warsaw
Department: IT & Engineering

Recruiter: Michał Ceglarski

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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 

Apply now

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Would you be OK with B2B contract?

Would you be OK with B2B contract?

What is your salary expectation? (B2B net hourly rate in PLN)
Where are you currently located? City and country
Do you already have a registered business entity in Poland, or are you able to set one up?

Do you already have a registered business entity in Poland, or are you able to set one up?

Do you require visa/residence sponsorship to be employed in Poland?

Do you require visa/residence sponsorship to be employed in Poland?

What is your earliest possible start date?
Do you have 2+ years of experience building production software?

Do you have 2+ years of experience building production software?

Do you have hands-on experience with Python (FastAPI or similar)?

Do you have hands-on experience with Python (FastAPI or similar)?

Do you have hands-on experience with Terraform and AWS / GCP / other cloud platforms?

Do you have hands-on experience with Terraform and AWS / GCP / other cloud platforms?

Do you have experience with CI/CD pipelines and containerized services (Docker)?

Do you have experience with CI/CD pipelines and containerized services (Docker)?

Voluntary Gender Identification

Dear potential Flixie, 

At Flix, we are committed to fostering diversity and inclusion. To support this initiative, we invite all applicants to complete our demographic questions on voluntary basis. Your responses will be processed as anonymized data and not linked to your profile, and thus assessed for statistical purposes and internal research. 

If you prefer not to provide this information, simply click on "I do not wish to answer." Be assured that neither the decision not to participate nor your answers will have an impact on your application, and your answers will remain anonymous and unidentifiable to you individually. The decision on your application will be made independently from your participation and the information you provide. 

We appreciate your cooperation in advance! 

What gender do you identify as? / Mit welchem Geschlecht identifizierst du dich?