Senior Python Developer and Test Automation Engineer

Join Mizuho as a Senior Python Developer and Test Automation Engineer!

In this role you will be responsible for the design, development, automation, and support of applications and system components using Python, including but not limited to automation scripts, batch jobs, test automation frameworks, and backend processing components. The role requires full ownership of assigned applications and automation tasks across the SDLC, including development, unit testing, system testing, change management, production releases, and production support. A key expectation is a strong focus on automated testing (BDD), application performance, and system stability to ensure reliable and resilient operations.

PRINCIPAL DUTIES AND RESPONSIBILITIES

Systems Design, Development and Support

• Perform system and requirements analysis and translate business and operational requirements into automated Python solutions.
• Design and develop Python-based automation scripts to automate jobs, workflows, data processing, and operational tasks.
• Build and maintain backend Python applications and scheduled/batch processes with clear restart, recovery, and error-handling mechanisms.
• Develop reusable libraries, utilities, and frameworks to standardize automation and testing patterns.
• Apply well-accepted design patterns and best practices to ensure maintainable, scalable, and secure Python code.
• Document technical designs, automation flows, and operational procedures.

Automation and Test Engineering

• Design and implement test automation frameworks using BDD tools (e.g., Behave, pytest-bdd, Cucumber-style frameworks).
• Develop automated test suites covering functional, regression, and integration scenarios.
• Enforce strong unit testing practices using Python testing frameworks; define coverage and quality expectations.
• Integrate automated tests into CI/CD pipelines to ensure early defect detection and regression prevention.

System Testing: DUT, SIT and UAT (Planning, Execution and Evaluation)

• Participate in planning and execution of DUT, SIT, and UAT, coordinating closely with QA and business teams.
• Support defect analysis, remediation, and re-testing activities.
• Ensure test evidence and documentation are produced to meet audit and compliance requirements where applicable.

Performance and Stability (Key Focus)

• Proactively identify and resolve performance bottlenecks in Python scripts and applications.
• Improve system stability through robust exception handling, retries, idempotency, and resource management.
• Tune batch jobs and automated processes for efficiency, scalability, and predictable execution.
• Establish logging, monitoring, and alerting standards for automated jobs and backend processes.

Issues Resolution and Production Support

• Manage issues and enhancements using tools such as JIRA or equivalent issue tracking systems.
• Provide production support, including incident triage, root-cause analysis, and timely resolution of issues.
• Support operational controls such as certifications, password rotations, vulnerability remediation, and audit activities.

Other Responsibilities

• No direct reports; however, this person should be able to run small to medium initiatives, support other developers, and provide technical guidance.
• Coordinate with infrastructure, DevOps, and other technology teams to deploy and operate automation solutions.
• Take complete ownership of assigned tasks and manage priorities with minimal daily supervision.

MINIMUM JOB REQUIREMENTS OR EXPERIENCE

Business Knowledge and Skills

• At least 8–10 years of professional development experience.
• Experience in banking, financial services, or other regulated environments preferred.

TECHNICAL SKILLS

CORE – MUST HAVE

• Expert-level experience with Python development.
• Strong hands-on experience with automation using Python scripts for jobs, workflows, and system processes.
• Proven experience with test automation using BDD frameworks (e.g., Behave, pytest-bdd).
• Strong focus on unit testing using Python testing frameworks (pytest, unittest, mocking libraries).
• Demonstrated ability to build reliable, high-performance, and stable Python applications and batch jobs.
• Experience with job scheduling, batch processing, and file/data processing.
• Experience integrating automation and tests into CI/CD pipelines.
• Solid understanding of object-oriented programming, modular design, and clean code practices.
• Experience working with relational databases and SQL.
• Strong troubleshooting skills and ability to resolve production issues under pressure.
• Ability to analyze and document business processes, automation flows, and system behavior.

NICE TO HAVE

• Experience with REST APIs and integration automation.
• Experience with messaging or event-driven processing.
• Exposure to container platforms (Docker, Kubernetes/OpenShift).
• Familiarity with Linux/Unix environments.
• Experience with performance profiling, logging frameworks, and observability tools.
• Experience with cloud platforms (Mainly Azure).

OTHER

• Bachelor’s degree or equivalent in Computer Science or related field.
• Strong verbal and written communication skills.
• Strong analytical, problem-solving, and multi-tasking abilities.
• Ability to work effectively with end users, technical teams, and management as needed.

NOTE:

This Job Description is not intended to be an exhaustive list of all responsibilities, skills, efforts, or working conditions associated with this job. The responsibilities and requirements may be modified or expanded over time based on business needs.

The expected base salary ranges from $111k-$170k. Salary offers are based on a wide range of factors including relevant skills, training, experience, education, and, where applicable, certifications and licenses obtained. Market and organizational factors are also considered. In addition to salary and a generous employee benefits package, successful candidates are eligible to receive a discretionary bonus.

#LI-Hybrid

Other requirements

Mizuho has in place a hybrid working program, with varying opportunities for remote work depending on the nature of the role, needs of your department, as well as local laws and regulatory obligations. Roles in some of our departments have greater in-office requirements that will be communicated to you as part of the recruitment process.

Company Overview

Mizuho Financial Group, Inc. is the 15th largest bank in the world as measured by total assets of ~$2 trillion. Mizuho's 60,000 employees worldwide offer comprehensive financial services to clients in 35 countries and 800 offices throughout the Americas, EMEA and Asia. Mizuho Americas is a leading provider of corporate and investment banking services to clients in the US, Canada, and Latin America. Through its acquisition of Greenhill, Mizuho provides M&A, restructuring and private capital advisory capabilities across Americas, Europe and Asia. Mizuho Americas employs approximately 3,500 professionals, and its capabilities span corporate and investment banking, capital markets, equity and fixed income sales & trading, derivatives, FX, custody and research. Visit www.mizuhoamericas.com.

Mizuho Americas offers a competitive total rewards package.

We are an EEO/AA Employer - M/F/Disability/Veteran.

We participate in the E-Verify program.

We maintain a drug-free workplace and reserve the right to require pre- and post-hire drug testing as permitted by applicable law.

#LI-MIZUHO