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July 15, 2026

Senior Full Stack Engineer (Python)

Senior • Hybrid

Warsaw, Poland

We are looking for a highly experienced, strictly hands-on Senior Full Stack Engineer (Python) to join a senior engineering team. You will drive the delivery and modernization of a complex B2B SaaS platform used by global enterprise clients.

Responsibilities

  • Build new platform modules end-to-end: translate business requirements into technical specs (use cases, data models, API designs) through to production deployment
  • Execute modernization of the Python/Flask codebase - clean layered architecture, reduced technical debt, improved testability
  • Act as quality gate for all AI-generated code - catching logic errors, security issues, and architectural violations
  • Partner with the Intelligence Systems Engineer on features touching the AI/agent layer
  • Collaborate with the Angular Architect on API contracts and frontend integration
  • Write operational documentation: changelogs for QA, operations guides for DevOps, architecture docs for developers
  • Proactively identify and address security concerns during development

Min requirements

  • Proven commercial experience as a Senior Backend or Full Stack Engineer, actively engaged in hands-on coding (no pure advisory roles)
  • Strong proficiency in modern Python, with a focus on writing clean, type-safe, and well-documented code
  • Solid experience with Python web frameworks (e.g., Flask, FastAPI, Django) and a good understanding of web application architecture
  • Expertise in relational databases (preferably PostgreSQL), SQL, and schema design
  • Strong security mindset with a proven ability to identify, understand, and mitigate real-world web vulnerabilities
  • Hands-on experience using AI coding tools (Copilot, Cursor, Claude) as part of your daily workflow, paired with a critical eye for reviewing AI-generated code
  • Experience working with containerization (Docker, Kubernetes) and background processing systems (e.g., Redis, Celery)
  • Excellent independent problem-solving skills and the ability to navigate complex codebases

Would be a plus

  • Proven experience decomposing monolithic/legacy codebases into a clean, layered architecture
  • Hands-on modernization experience within mature, production-grade SaaS products
  • Familiarity with Python ORMs (e.g., SQLObject, SQLAlchemy)

We offer

  • Opportunity to work on bleeding-edge projects
  • Work with a highly motivated and dedicated team
  • Competitive salary
  • Flexible schedule
  • Benefits package - medical insurance, sports
  • Corporate social events
  • Professional development opportunities
  • Well-equipped office

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Technology

EPAM Systems

Senior Full Stack Engineer (Python + React + SQL)

Senior

Remote

Poznan, Poland

🏢 Summary: Senior Full Stack Engineer role focused on building scalable end-to-end web applications for the financial industry using modern frontend, backend and database technologies. The position involves developing responsive interfaces, backend systems, APIs and database solutions while collaborating with cross-functional teams and DevOps. The offer includes remote work flexibility, professional development programs, certifications and comprehensive benefits. 🗂️ Requirements: Bachelor's or Master's degree in Computer Science, Software Engineering or related field, 5+ years of experience as a Full Stack Engineer, Strong knowledge of data structures and algorithms, Proficiency in React, Proficiency in JavaScript, Proficiency in Python, Experience with FastAPI, Flask or Django, Experience with SQL Server, Snowflake or PostgreSQL, Understanding of RESTful API design, Experience building and consuming APIs, Proficiency in Git, Ability to troubleshoot and debug backend systems, Strong communication and collaboration skills 📃 Skills: React, JavaScript, Python, FastAPI, Flask, Django, SQL, SQLServer, Snowflake, PostgreSQL, REST, Git, MongoDB, Redis, AWS, Azure, GCP, Docker, Kubernetes, Cursor, Claude, Codex 🏢 Description: We are seeking a skilled and versatile Senior Full Stack Engineer to join our dynamic development team, combining strong programming and data management expertise with familiarity with financial instruments. You will design, develop and maintain end-to-end software applications and systems, from frontend to backend, leveraging a modern technology stack to build scalable and high-quality solutions within the financial industry domain. Responsibilities Design, implement and optimize responsive, user-friendly web interfaces using the latest UI/UX technologies Develop and maintain server-side components of software applications Monitor and optimize performance, scalability and reliability of backend systems Collaborate with cross-functional teams including data engineers, product managers and designers to ensure seamless integration of frontend and backend components Write clean, efficient and well-documented code following best practices and coding standards Use AI coding agents such as Cursor, Claude Code and Codex Build and optimize database structures and queries for efficient data storage and retrieval Perform thorough testing and debugging to identify and resolve issues or bottlenecks Stay updated with industry trends and propose improvements to backend architecture and development processes Participate in code reviews to maintain code quality and mentor junior developers Partner with DevOps engineers to deploy and maintain applications in production environments Provide technical guidance and support to team members as needed Requirements Bachelor's or Master's degree in Computer Science, Software Engineering or a related field 5+ years of experience as a Full Stack Engineer developing scalable web applications, with strong proficiency in computer science fundamentals such as data structures and algorithms Proficiency in React, JavaScript and Python Experience with FastAPI, Flask or Django Knowledge of relational databases such as SQL Server, Snowflake and PostgreSQL Background in the Financial Industry or curiosity to learn and engage in Private Equity/Credit business domains Understanding of RESTful API design principles and experience building and consuming APIs Proficiency in Git and collaborative development workflows Strong problem-solving skills and ability to troubleshoot and debug complex backend issues Excellent communication and collaboration skills with the ability to work effectively in a team environment Nice to have Familiarity with NoSQL databases like MongoDB or Redis Knowledge of Accounting or Advent Geneva Understanding of Data Engineering tools and platforms such as data pipelines and data lakes Experience with cloud platforms like AWS, Azure or Google Cloud Platform and containerization technologies like Docker or Kubernetes Experience in bank loans/leveraged loans, fixed-income products, CLOs, derivatives, ABS and CMBS products We offer We gather like-minded people: Engineering community of industry professionals Friendly team and enjoyable working environment Flexible schedule and opportunity to work remotely within Poland Chance to work abroad for up to 60 days annually Business-driven relocation opportunities We provide growth opportunities: Outstanding career roadmap Leadership development, career advising, soft skills, and well-being programs Certification (GCP, Azure, AWS) Unlimited access to LinkedIn Learning, Get Abstract, Cloud Guru English classes We cover it all: Stable income (Employment Contract or B2B) Participation in the Employee Stock Purchase Plan Benefits package (health insurance, multisport, shopping vouchers) Strategically located offices featuring entertainment and relaxation zones, table tennis and football, free snacks, fantastic coffee, and more Referral bonuses Corporate, social and well-being events Please, note: The set of bonuses might vary based on the role you apply for – specifics will be discussed with our recruiter during the general interview. We will reach out to selected candidates exclusively. EPAM is a leading global provider of digital platform engineering and development services. We are committed to having a positive impact on our customers, our employees, and our communities. We embrace a dynamic and inclusive culture. Here you will collaborate with multi-national teams, contribute to a myriad of innovative projects that deliver the most creative and cutting-edge solutions, and have an opportunity to continuously learn and grow. No matter where you are located, you will join a dedicated, creative, and diverse community that will help you discover your fullest potential.

Technology

EPAM Systems

Senior Full Stack Engineer (Python + React + SQL)

Senior

Remote

Wroclaw, Poland

🏢 Summary: Senior Full Stack Engineer role focused on building scalable financial industry applications using modern frontend and backend technologies. The position involves developing end-to-end web solutions, optimizing backend systems, working with databases and APIs, and collaborating with cross-functional teams. The offer includes remote work flexibility, professional development programs, certifications, and comprehensive benefits. 🗂️ Requirements: Bachelor's or Master's degree in Computer Science, Software Engineering or related field, 5+ years of experience as a Full Stack Engineer, Proficiency in React, Proficiency in JavaScript, Proficiency in Python, Experience with FastAPI, Flask or Django, Knowledge of SQL Server, Snowflake and PostgreSQL, Understanding of RESTful APIs, Proficiency in Git, Strong knowledge of data structures and algorithms, Experience developing scalable web applications, Ability to troubleshoot and debug backend systems 📃 Skills: React, JavaScript, Python, FastAPI, Flask, Django, SQL, SQLServer, Snowflake, PostgreSQL, REST, Git, MongoDB, Redis, AWS, Azure, GCP, Docker, Kubernetes, Cursor, Claude, Codex 🏢 Description: We are seeking a skilled and versatile Senior Full Stack Engineer to join our dynamic development team, combining strong programming and data management expertise with familiarity with financial instruments. You will design, develop and maintain end-to-end software applications and systems, from frontend to backend, leveraging a modern technology stack to build scalable and high-quality solutions within the financial industry domain. Responsibilities Design, implement and optimize responsive, user-friendly web interfaces using the latest UI/UX technologies Develop and maintain server-side components of software applications Monitor and optimize performance, scalability and reliability of backend systems Collaborate with cross-functional teams including data engineers, product managers and designers to ensure seamless integration of frontend and backend components Write clean, efficient and well-documented code following best practices and coding standards Use AI coding agents such as Cursor, Claude Code and Codex Build and optimize database structures and queries for efficient data storage and retrieval Perform thorough testing and debugging to identify and resolve issues or bottlenecks Stay updated with industry trends and propose improvements to backend architecture and development processes Participate in code reviews to maintain code quality and mentor junior developers Partner with DevOps engineers to deploy and maintain applications in production environments Provide technical guidance and support to team members as needed Requirements Bachelor's or Master's degree in Computer Science, Software Engineering or a related field 5+ years of experience as a Full Stack Engineer developing scalable web applications, with strong proficiency in computer science fundamentals such as data structures and algorithms Proficiency in React, JavaScript and Python Experience with FastAPI, Flask or Django Knowledge of relational databases such as SQL Server, Snowflake and PostgreSQL Background in the Financial Industry or curiosity to learn and engage in Private Equity/Credit business domains Understanding of RESTful API design principles and experience building and consuming APIs Proficiency in Git and collaborative development workflows Strong problem-solving skills and ability to troubleshoot and debug complex backend issues Excellent communication and collaboration skills with the ability to work effectively in a team environment Nice to have Familiarity with NoSQL databases like MongoDB or Redis Knowledge of Accounting or Advent Geneva Understanding of Data Engineering tools and platforms such as data pipelines and data lakes Experience with cloud platforms like AWS, Azure or Google Cloud Platform and containerization technologies like Docker or Kubernetes Experience in bank loans/leveraged loans, fixed-income products, CLOs, derivatives, ABS and CMBS products We offer We gather like-minded people: Engineering community of industry professionals Friendly team and enjoyable working environment Flexible schedule and opportunity to work remotely within Poland Chance to work abroad for up to 60 days annually Business-driven relocation opportunities We provide growth opportunities: Outstanding career roadmap Leadership development, career advising, soft skills, and well-being programs Certification (GCP, Azure, AWS) Unlimited access to LinkedIn Learning, Get Abstract, Cloud Guru English classes We cover it all: Stable income (Employment Contract or B2B) Participation in the Employee Stock Purchase Plan Benefits package (health insurance, multisport, shopping vouchers) Strategically located offices featuring entertainment and relaxation zones, table tennis and football, free snacks, fantastic coffee, and more Referral bonuses Corporate, social and well-being events Please, note: The set of bonuses might vary based on the role you apply for – specifics will be discussed with our recruiter during the general interview. We will reach out to selected candidates exclusively. EPAM is a leading global provider of digital platform engineering and development services. We are committed to having a positive impact on our customers, our employees, and our communities. We embrace a dynamic and inclusive culture. Here you will collaborate with multi-national teams, contribute to a myriad of innovative projects that deliver the most creative and cutting-edge solutions, and have an opportunity to continuously learn and grow. No matter where you are located, you will join a dedicated, creative, and diverse community that will help you discover your fullest potential.