Python Testing Expert (FIXML / Capital Markets)

About Us

BySix Engineers the future and drives innovation. We are more than just a standard software engineering company, we believe that true impact comes from combining technical expertise with human values. That's why we reflect that in our approach - technology is not the end goal, but the enabler.

Why Us?

🫸 Multidisciplinary team 📒 Training on demand 💴 Attractive salary and benefits package 📈 Career progression plans 👌 And amazing get together events

What are we looking for?

We are looking for a Python Testing Expert with:

• Bachelor’s degree in Computer Science, Engineering, Finance, or related field (or equivalent experience).
• Experience within the Banking sector.
• Proven experience validating FIXML or other FIX-protocol message formats in a Capital Markets environment.
• Strong Python skills with hands-on experience using libraries for XML processing and data manipulation (such as enum,lxml, openpyxl, ezpdf, json, proton, requests, and prettytable, along with the Robot Framework).
• Solid understanding of trade lifecycle, trade capture, clearing, and settlement concepts in equities, fixed income, or derivatives.
• Experience writing automated test scripts and building test frameworks; familiarity with testing tools and frameworks (for example, pytest or unittest).
• Proficiency in SQL and experience validating data in relational databases.
• Strong analytical and debugging skills with attention to detail.
• Excellent communication skills and ability to work with cross-functional teams (developers, business analysts, operations).

We Value

• Familiarity with FIX protocol specifications and FIXML schema.
• Experience with message transformation technologies (XSLT, mapping tools) and XML schema validation.
• Knowledge of clearing/settlement systems or industry utilities (for example, Omgeo, DTCC).
• Experience with version control systems (Git) and CI/CD tools.
• Exposure to test management tools and defect tracking systems (JIRA, TestRail, etc.).
• Prior experience in a regulated environment (e.g., MiFID II, Dodd-Frank).

What do we expect from you?

• Validate FIXML messages and transaction flows between trading systems and clearing/settlement systems to ensure data accuracy and compliance with business rules.
• Develop, maintain, and execute automated and manual test cases to verify data mappings, message transformations, and end-to-end trade lifecycle scenarios.
• Parse and analyze XML/FIXML payloads using Python libraries (for example, pandas, lxml, xml.etree, or equivalent) to extract, transform, and compare message fields.
• Build and maintain test harnesses, scripts, and utilities to automate validation tasks and regression testing.
• Reconcile trade data between source and downstream systems; identify root causes for mismatches and work with development, QA, and business teams to resolve issues.
• Create clear, reproducible defect reports and help prioritize fixes with stakeholders.
• Collaborate with business analysts to validate functional requirements and mapping specifications.
• Maintain test data sets and document test procedures, results, and metrics.
• Support CI/CD pipelines and integrate tests into automated build processes where applicable.
• Contribute to continuous improvement of test strategies, tools, and best practices.

Are you ready?

If you're ready to make a real impact by leveraging cutting-edge technology and fostering human-centric solutions, BySix is the place for you. Together, we'll drive innovation and create lasting business value.

Note: BySix is an equal opportunity employer. All applicants will be considered and analyzed regardless of ethnicity, religion, gender identity, sexual orientation, national origin, age, or disability status.