Senior Python Developer (with AWS)

Join our team in Warsaw, where we’re collaborating on a cutting-edge fintech venture with a global industry leader. Together with our Partner – Klarna, we’re building an IT hub designed to drive innovation in digital payment solutions. We’re on the lookout for top-tier engineers who thrive in dynamic, forward-thinking environments. Spyrosoft is leading the recruitment process, facilitating a seamless experience for candidates who are ready to shape the future of online shopping and payments.

This opportunity is ideal for engineers who value independence, proactiveness, and flexibility. Our engagement begins with a B2B contract through Spyrosoft, transitioning to a direct contract with our Partner.

We offer a hybrid work model in Warsaw’s vibrant Wola district. English fluency and eligibility to work in Poland are essential, as is the successful completion of a background check to meet the rigorous standards of the financial domain.

Our process:

• CV selection
• Initial recruitment screening
• Technical interview
• Online logic test
• Cultural fit interview

Job description

We are seeking a Senior Engineer to join our innovative technology team. In this role, you will be pivotal in developing and enhancing Python-based tools and integrations into AWS services, such as Lambda/GlueJob, as well as creating new modules and integrations with company-wide internal Wiki-like system and chatbot solutions. This position offers the opportunity to directly impact our products while working in a dynamic, fast-paced environment.

Requirements

• Bachelor’s or Master’s degree in Computer Science, Information Technology, or a related field.
• Minimum of 5 years of experience in software development, with a strong emphasis on Python for backend development and integrations.
• Expertise in Python frameworks and libraries such as FastAPI, Flask, and Pydantic for building and validating robust APIs.
• Being able to build user interfaces using Django or Streamlit is a plus.
• Hands-on experience with asynchronous programming using tools like AsyncIO and libraries such as Aiohttp.
• Proficiency in serverless architectures and AWS services, including Lambda, API Gateway, S3, DynamoDB, Step Functions, and CloudWatch.
• Familiarity with database technologies, including both SQL (PostgreSQL, MySQL) and NoSQL (MongoDB, Redis).
• Strong knowledge of messaging and event-driven architectures using tools like Kafka, RabbitMQ, or AWS SQS/SNS.
• Proficiency in containerization technologies like Docker and orchestration platforms such as Kubernetes.
• Experience with CI/CD pipelines using tools like GitHub Actions, Jenkins, GitLab CI/CD, or AWS CodePipeline.
• Familiarity with infrastructure-as-code tools like Terraform, CloudFormation, or Pulumi.
• Solid understanding of data serialization formats like JSON, YAML, and Protocol Buffers (Protobuf).
• Experience with testing frameworks and libraries, such as Pytest, Unittest, or Mock, to ensure code reliability.
• Knowledge of logging and monitoring tools such as ELK Stack, Prometheus, Grafana, or Datadog.
• Familiarity with modern authentication and authorization methods, including OAuth2, JWT, and SSO integrations (LDAP or Active Directory).
• Experience working with APIs and SDKs for third-party integrations.
• Knowledge of data engineering tools like Pandas, NumPy, Apache Spark, or Airflow for ETL processes and data pipelines.
• Excellent problem-solving skills and ability to debug and troubleshoot complex systems effectively.
• Outstanding organizational and time management skills.
• Fluent in English with effective communication skills.
• DevOps skills, including the ability to design and manage cloud-native architectures and microservices, are a significant advantage.

Key responsibilities:

• Lead the development and ongoing enhancement of Python-based tools and integrations into AWS services, including Lambda, and internal systems like Wiki-like platform and chatbots.
• Design, develop, and maintain efficient, reusable, and reliable code for backend systems and integrations.
• Ensure the performance, quality, and responsiveness of tools and applications.
• Collaborate with a team of DevOps, Data Engineers and product managers to ideate and implement software solutions.
• Develop and integrate server-side logic and functionality with user-facing elements as needed.
• Implement security and data protection measures.
• Enable user authentication and access control, including SSO and LDAP integration.
• Analyze and improve the efficiency, scalability, and stability of various system resources.
• Test software to ensure responsiveness, reliability, and efficiency.
• Troubleshoot, debug, and upgrade software systems.
• Write and maintain clear technical documentation.