3Pillar

Senior Full-Stack Software Engineer (Python / React)

3Pillar
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8 days ago
Bucharest, RomaniaSenior

Responsibilities

  • Build performant, testable, scalable, secure, and maintainable client code.
  • Implement security remediation through Software Composition Analysis triaging, prioritization, remediation, and verification.
  • Design and implement scalable AI and agentic workflows using LLMs with a focus on reliability and observability.
  • Build and maintain responsive, well-tested React frontend features alongside backend services.
  • Own technical projects from design through successful production launch.
  • Identify and remediate technical debt to improve system stability, performance, and developer velocity.
  • Partner with Product and Engineering leadership to translate business requirements into scalable technical solutions.
  • Gather requirements, maintain documentation, provide project status and estimation, and participate in code reviews.
  • Use GitHub Copilot and spec-driven development practices within an AI-assisted engineering workflow.

Requirements

  • Extensive senior-level professional software engineering experience with strong Python and distributed-systems expertise.
  • Ability to own technical features from design through production deployment with minimal supervision.
  • Deep understanding of system design, architecture, and ambiguous technical problem solving.
  • Expertise with Git source control tools and Python package management tools such as UV or Conda.
  • Experience with unit testing using Pytest.
  • Hands-on experience building production React applications alongside backend services at scale.
  • Experience managing Docker containers and orchestrating them with Kubernetes and AKS.
  • Intermediate design proficiency with UML, C4, or ArchiMate.
  • Experience engineering medium-to-large-scale software systems.
  • Proficiency with relational databases and experience deploying and operating systems on AWS.
  • Working knowledge of GitHub Copilot or similar AI coding assistants and spec-driven development practices.
  • Familiarity with Agile software development methodologies and proficiency in English.
  • Preferred experience includes Flask, Snowflake, agentic frameworks such as MCP and A2A, Apache Airflow, Automic Automation, HTTP, JSON, XML, GitHub Advanced Security, Snyk, Checkmarx, Claude Code, and Cursor.
  • Proficiency in object-oriented programming concepts including inheritance, polymorphism, classes, instances, and properties.

Benefits

  • Remote-first work environment with flexible office, home, or blended arrangements.
  • Global team environment with opportunities to work across cultures and resources.
  • Wellbeing initiatives, fitness offerings, mental health plans where available, and generous time off.
  • Career growth and development opportunities across projects, offerings, and industries.

Tech Stack

Apache AirflowAWSDockerFlaskGitKubernetespytestPythonReactSnowflake
3Pillar

About 3Pillar

1,001-5,000 employees
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