Senior Software Engineer (Python/AWS)

Senior Software Engineer (Python/AWS)

Industry

Software Development

Employment Type

Full-time (Labour Contract/B2B)

Location

Sofia, office/hybrid

Who We Are

Yamasoft is a leading software solutions provider specializing in modern IT technologies powered by AI/ML. With over 25 years of experience in the software industry, our team brings expertise in building high-performing teams and delivering top-notch software solutions. We focus on delivering high-quality software that aligns seamlessly with our customers’ objectives.

Description

We are building a new team around a biotechnological SaaS product for infectious disease diagnostics, pharmaceutical discovery, and microbiome analysis. The team will focus on designing and implementing the distributed, cloud-based SaaS bioinformatics solution for both research and clinical diagnostics.

We seek a highly skilled and experienced Senior Software Engineer to join our team. In this role, you will implement features, design RESTful and GraphQL APIs, write unit tests, and maintain our cloud systems. You will collaborate with cross-functional teams to ensure the seamless integration of backend services with frontend applications, design data science pipelines, troubleshoot issues, fix bugs, and ensure the security, reliability, and scalability of our cloud solutions.

Key Responsibilities

• Develop and integrate new features into the distributed cloud system to enhance the functionality and performance of the data lake solution (Docker, Python, Linux).
• Design and architect a scalable, efficient, and maintainable API micro-services (RESTful and GraphQL).
• Design and implement ETL pipelines to support data lake operations (Iceberg, Arrow, Spark, Flink, Redshift, etc.)
• Design and integrate ML and AI agentics systems, write MCP and CAG/RAG for LLMA (Docker/Python/Tensorflow/Duckdb).
• Write and maintain comprehensive unit tests using Pytest to ensure code quality and reliability.
• Monitor system performance, identify issues, and implement solutions to maintain optimal system functionality (APS, SPM, etc).
• Troubleshoot and resolve bugs promptly to ensure a seamless user experience.
• Collaborate with product managers and front-end developers to understand feature requirements and deliver robust backend support.

Advantage: Collaboration and Leadership skills

• Lead and mentor the back-end development team, providing technical guidance and support.
• Coordinate development activities with other teams, including DevOps, backend, front-end engineers, designers, data scientists, and product managers.

Technologies and Tools

• Python, Flask, FastAPI, Celery,
• Redis, PostgreSQL, RabbitMQ
• Scipy, Numpy, Scikit-Learn, Pandas
• Iceberg, DuckDb, pyArrow
• LLMA, MCP, RAG, CAG
• Pytest, Locust
• Linux, Docker, Nextflow
• AWS Cognito, ECS, S3, Redshift, Glue, Athena, Flink, Bedrock, etc.

Qualifications

• Proven experience as a back-end engineer, preferably working with web APIs, with at least 5 years in a senior role (Django, Flask, and FastAPI).
• Proficient in Python and experienced with Jupyter and data science libraries (Numpy and Pandas).
• Hands-on experience with AWS services, especially for data processing and data streaming.
• Familiarity with distributed systems design, messaging, orchestration: Nextflow, Celery, etc.
• Proficient in writing unit tests using Pytest.
• Excellent problem-solving abilities and attention to detail.
• Strong verbal and written communication skills.
• Ability to collaborate effectively with cross-functional teams.
• Bachelor’s degree in Computer Science, Engineering, or a related field.
• Relevant certifications are a plus.

What we offer

• 25 Days Paid Time Off
• Additional Health Insurance
• Multisport card
• The opportunity to be among the very first team members
• Excellent career development opportunities
• Attractive remuneration package

If you are interested in this job offer, please send your CV in English.

Do not apply if you cannot visit the office in Sofia, BG.

All CVs will be treated in strict confidentiality. Only shortlisted candidates will be contacted.