FlixMobility

Intercity bus and rail travel platform

Software Engineer

Full-Stack EngineeringConfirmed live in the last 24 hours

Full-timeWarsaw, PolandPLN89 - PLN119 /hr

About the Job

Requirements

Have 2–4 years of experience building production software.
Be strong in Python, using FastAPI or a similar framework, and be comfortable with TypeScript or JavaScript; React is a plus.
Have hands-on experience with AWS and infrastructure as code using Terraform.
Have a solid Git workflow, CI/CD, and containerized-services experience with Docker.
Be able to navigate vague or shifting requirements, take action, make decisions with incomplete information, and use sound judgment.
Be pragmatic and ship iteratively.
Be curious about and comfortable using AI tooling in day-to-day development.
Be based in Poland and operate as an independent contractor under a B2B service agreement.

Responsibilities

Design, build, and maintain Python backend services and TypeScript/React frontends across the customer service platform.
Take greenfield products from concept to production by making architectural decisions, prototyping, validating, and iterating under uncertainty.
Develop and extend Twilio Functions in JavaScript for voice/IVR and webchat flows.
Manage infrastructure as code with Terraform (HCL) on AWS, including building and deploying infrastructure.
Integrate third-party and AI platforms, including AWS Bedrock, Twilio, Cognigy, LiteLLM, and Kafka.
Use and help improve internal AI tooling to increase engineering speed and quality.
Instrument and monitor services using Datadog, event forwarding, and alerting, and respond to production issues.
Build and scale the customer service platform for passenger conversations across markets, including AI-powered chatbots and voice agents, help-center tools, and knowledge-base tools.
Own services end-to-end, from infrastructure provisioning through production.

Desired Qualifications

Experience building products from scratch in a fast-moving team.
Conversational AI, chatbot, or IVR experience, including Twilio, Cognigy, or DialogFlow.
LLM or generative AI integration experience, including Bedrock, retrieval-augmented generation (RAG), or MCP servers.
Event-streaming experience with Kafka and observability experience with Datadog.
Customer-service or contact-center domain experience.
React experience.

Rate: 89 – 119 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

About the Company

FlixMobility

Intercity bus and rail travel platform

FlixMobility, now operating under the corporate brand Flix, is a travel technology company connecting passengers with intercity bus and rail services. Through brands including FlixBus and FlixTrain, it manages route planning, pricing, ticketing, marketing and the digital customer experience while transportation partners operate many vehicles. The platform serves travelers across Europe, North America and other markets. Its model combines software, network planning and partner operations to make long-distance ground travel bookable through a unified consumer service.

Company size: Not listed
Company stage: Not listed
Total funding: Not listed
Headquarters: Not listed
Founded: Not listed

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