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Senior Full-Stack Developer – Python, AI & React

Summary

Build and maintain AI-driven financial platforms by developing React/Next.js frontends and Python backends, integrating AI/ML features like RAG pipelines and agentic workflows for financial data processing and decision-making.

Unleash innovation at scale — shape the future of AI-driven financial platforms.

Location & Work Model: Remote-based opportunity with flexibility to work from Poland or Portugal, up to 5 days per week.

As a Senior Full-Stack Developer, you will be working for our client, a leader in capital markets technology, delivering cutting-edge AI and web solutions. You will build and maintain high-performance applications that integrate modern React front ends with Python back ends, empowered with AI/LLM features to revolutionize financial data processing and decision-making. Join us and contribute to shaping innovative financial ecosystems.

Your main responsibilities:

  • Design and develop end-to-end features, including React/Next.js interfaces and Python back-end services and APIs.

  • Implement, maintain, and optimize AI/LLM-powered functionalities such as RAG pipelines, agentic workflows, and API integrations.

  • Build responsive, accessible user interfaces from design specifications to production deployment.

  • Write clean, well-tested, and maintainable code across both front-end and back-end layers.

  • Design and implement REST/GraphQL APIs and data models for complex financial and market data.

  • Collaborate with cross-functional teams including designers, data/ML engineers, and product managers to deliver features end-to-end.

  • Optimize applications for performance, scalability, security, and cross-browser compatibility.

  • Participate in code reviews and contribute to engineering standards and best practices.

  • Leverage AI-assisted development tools to accelerate delivery and enhance code quality.

You're ideal for this role if you have:

  • Minimum of 6 years of experience in full-stack development, with a focus on Python and JavaScript.

  • Strong expertise in React, TypeScript, and modern JavaScript (ES6+).

  • Proven experience with back-end frameworks such as FastAPI, Django, or Flask.

  • Solid understanding of REST API design, asynchronous data handling, and front-end best practices.

  • Familiarity with HTML5, CSS3, and responsive UI design.

  • Knowledge of relational and NoSQL databases like PostgreSQL and MongoDB.

  • Strong grasp of Git and collaborative development workflows.

  • Good understanding of web security, performance, and accessibility fundamentals.

It is a strong plus if you have:

  • Production experience with Next.js (SSR, SSG, API routes).

  • Hands-on experience building or integrating AI/LLM features (e.g., prompt engineering, vector databases, LangChain, LlamaIndex).

  • Experience working with Claude and other AI solutions.

  • Familiarity with state management libraries (Redux, React Query, etc.).

  • Knowledge of CSS frameworks like Tailwind or styled-components.

  • Experience with cloud deployment, infrastructure (AWS, GCP), Docker, and CI/CD pipelines.

  • Testing expertise with Pytest, Jest, React Testing Library, or Cypress.

Language Required for the role:

  • Fluent command of English.

Eligibility to work on this role:

  • Only candidates with an existing legal right to work in the European Union will be considered.

#MAKEYourCareerBETTER

Interested? Apply now and include your CV (preferably in English), along with a statement confirming your consent to the processing and storage of your personal data.

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