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Senior Python Developer Jobs in New Castle, DE (NOW HIRING)

elt

Senior Controls Engineer

Philadelphia, PA

$97.90K - $129.20K/yr

Senior Controls Engineer Currently, we are seeking a Senior Controls Engineer to support our ... Strong programming skills in languages such as C/C++, Python, or similar. * Experience with ...

Berkley

Sr. DevOps Platform Engineer

Wilmington, DE · On-site

$51.25 - $70/hr

Responsibilities As a Senior DevOps Platform Engineer , you will play a critical role in ensuring ... Strong software engineering and automation skills, including proficiency in Python, Go, Bash, or ...

Berkley

Sr. DevOps Platform Engineer

Wilmington, DE

$51.25 - $70/hr

Responsibilities As a Senior DevOps Platform Engineer , you will play a critical role in ensuring ... Strong software engineering and automation skills, including proficiency in Python, Go, Bash, or ...

Outfront Media

Senior Data Engineer

Fairfield, NJ

$108.10K - $146.80K/yr

As a Senior Data Engineer, you will leverage your expertise in cloud technologies, data ... years of experience using Python or similar languages to build scalable, efficient, and ...

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$53.3K

$137.7K

$189.1K

How much do senior python developer jobs pay per year?

As of May 30, 2026, the average yearly pay for senior python developer in New Castle, DE is $137,676.00, according to ZipRecruiter salary data. Most workers in this role earn between $117,800.00 and $158,500.00 per year, depending on experience, location, and employer.

What are the key skills and qualifications needed to thrive as a Senior Python Developer, and why are they important?

To thrive as a Senior Python Developer, you need advanced proficiency in Python programming, experience with software architecture, and a solid understanding of algorithms and data structures, usually backed by a degree in computer science or related fields. Familiarity with frameworks like Django or Flask, version control systems such as Git, and containerization tools like Docker are typically required, alongside knowledge of modern CI/CD pipelines. Strong problem-solving abilities, effective communication, and leadership skills help you collaborate with teams and mentor junior developers. Mastery of these skills ensures the delivery of scalable, maintainable software solutions and the ability to drive technical excellence within development teams.

What are some common challenges faced by Senior Python Developers when leading a development team?

Senior Python Developers often encounter challenges such as balancing hands-on coding with mentoring junior team members and ensuring code quality across the team. They are also responsible for making architectural decisions, which requires staying updated on best practices and emerging Python frameworks. Additionally, coordinating collaboration between cross-functional teams (like DevOps, QA, and front-end developers) can be complex, especially in agile environments where requirements may shift rapidly. Overcoming these challenges helps foster a productive and innovative team culture.

What are the main responsibilities of a Senior Python Developer?

A Senior Python Developer is responsible for designing, developing, and maintaining complex software applications using the Python programming language. They lead the technical aspects of projects, mentor junior developers, and ensure code quality through code reviews and best practices. Additionally, they collaborate with cross-functional teams to gather requirements, solve technical challenges, and deploy scalable and efficient solutions. Senior Python Developers are also expected to stay updated with the latest trends and advancements in Python and related technologies.

What is the difference between Senior Python Developer vs Python Developer?

AspectSenior Python DeveloperPython Developer
Required ExperienceTypically 5+ years, with leadership and complex project experienceUsually 1-3 years, focusing on core Python skills
ResponsibilitiesDesigning architecture, mentoring, handling complex systemsWriting code, debugging, implementing features
CertificationsOptional but beneficial (e.g., Python certifications, cloud certs)Often not required
Work EnvironmentCollaborative teams, project planning, code reviewsDevelopment-focused, task-oriented

The main difference between a Senior Python Developer and a Python Developer lies in experience, responsibilities, and leadership. Senior developers handle complex projects, mentor others, and often participate in architecture decisions, while Python Developers focus on coding and feature implementation. Both roles are essential in tech companies, but the senior role requires more experience and broader skills.

What cities near New Castle, DE are hiring for Senior Python Developer jobs? Cities near New Castle, DE with the most Senior Python Developer job openings:
Senior Python Developer jobs near you

Senior Analyst - Credit Analytics Credit Execution

OneMain Financial

Wilmington, DE • On-site

Full-time

Medical, Dental, Vision, Life, Retirement, PTO

Posted 12 days ago

OneMain Financial rating

7.6

Company rating: 7.6 out of 10

Based on 95 frontline employees who took The Breakroom Quiz

106th of 138 rated financial services

Job description

Senior Analyst - Credit Execution
Schedule: Full-Time Hybrid
Location: Wilmington, DE
We are seeking a Senior Analyst to join our Credit Analytics Credit Execution Team to support the implementation of credit and pricing-related strategies and models for the personal loans' portfolio across affiliate and partner platforms. This role will focus on delivering high-quality work products across various credit execution and decisioning operations engagements, collaborating closely with Data science, Analytics, Product, and Technology partners. You will work across platforms such as Credit Karma LightBox, Experian Activate, and other affiliate engagement channels, as well as backend decisioning platform integrations, to drive business impact through disciplined technical execution.
In the Role
  • Implement credit and pricing-related strategies into production-ready logic for personal loan origination workflows across affiliate platforms and backend decisioning systems.
  • Own end-to-end delivery, with minimum supervision, of strategy and model deployments, from requirements intake and technical specification through testing, validation, and production release.
  • Serve as the execution point of contact for affiliate platform integrations, developing and maintaining platform-specific configurations, eligibility logic, and offer presentation workflows.
  • Build and maintain Python-based scripts, data pipelines, and automation tools to support batch file generation, data extraction, eligibility processing, and reporting workflows.
  • Write and optimize SQL queries for data analysis, strategy validation, and portfolio performance monitoring across large-scale datasets.
  • Design and execute test-and-control frameworks (e.g., A/B split designs, eligibility segmentation) for new strategy rollouts and affiliate integrations.
  • Monitor deployed models and strategies and affiliate channel performance against expected benchmarks and recommend data-driven optimizations.
  • Prepare and deliver high-quality documentation, executive summaries, and evaluation materials for leadership review.
  • Proactively identify process improvement opportunities across the credit execution lifecycle and propose solutions backed by data.

Required
  • Bachelor's degree in computer science, engineering, or related quantitative field (Master's degree preferred) and 4+ years in financial services with experience in credit risk, lending operations, or decisioning.
  • Strong Python programming expertise, including proficiency with core data structures, object-oriented programming principles, and standard libraries (pandas, NumPy, requests).
  • Proficiency in SQL and experience working with large datasets (Snowflake, SQL Server, or equivalent).
  • Solid understanding of modern system architecture concepts (microservices, APIs, event-driven design).
  • Familiarity with containerization concepts (Docker, Kubernetes) and CI/CD pipelines.
  • Understanding of version control (Git) and modern software development practices.
  • Demonstrated ability to work independently with minimal oversight and drive initiatives through ambiguity.
  • Strong written and verbal communication skills with the ability to influence stakeholders and clearly articulate opportunities, trade-offs, and recommendations.

Preferred
  • Experience in credit decisioning or personal loan origination workflows within the financial services domain.
  • Familiarity with Credit Bureau data formats, basic statistics, and experience with data wrangling & visualization.
  • Exposure to LLM/AI tooling for process automation, documentation generation, or code assistance within a professional context, but not reliant upon LLM/AI.
  • Hands-on experience with Jira-based workflows, sprint capacity planning, and Agile delivery practices.

Who We Are
OneMain Financial (NYSE: OMF) is the leader in offering nonprime customers responsible access to credit and is dedicated to improving the financial well-being of hardworking Americans. Since 1912, we've looked beyond credit scores to help people get the money they need today and reach their goals for tomorrow. Our growing suite of personal loans, credit cards and other products help people borrow better and work toward a brighter future.
Driven collaborators and innovators, our team thrives on transformative digital thinking, customer-first energy and flexible work arrangements that grow lives, careers and our company. At every level, we're committed to an inclusive culture, career development and impacting the communities where we live and work. Getting people to a better place has made us a better company for over a century. There's never been a better time to shine with OneMain.
Because team members at their best means OneMain at our best, we provide opportunities and benefits that make their health and careers a priority. That's why we've packed our comprehensive benefits package for full- and some part-timers with:
  • Health and wellbeing options including medical, prescription, dental, vision, hearing, accident, hospital indemnity, and life insurances
  • Up to 4% matching 401(k)
  • Employee Stock Purchase Plan (10% share discount)
  • Tuition reimbursement
  • Paid time off (15 days' vacation per year, plus 2 personal days)
  • Paid sick leave as determined by state or local ordinance, prorated based on start date
  • Paid holidays (11 days per year, based on start date)
  • Paid volunteer time (3 days per year, prorated based on start date)

OneMain Holdings, Inc. is an Equal Employment Opportunity (EEO) employer. Qualified applicants will receive consideration for employment without regard to age, ancestry, citizenship status, color, creed, culture, disability, ethnicity, gender, gender identity or expression, genetic information or history, marital status, military status, national origin, nationality, pregnancy, race, religion, sex, sexual orientation, socioeconomic status, transgender or on any other basis protected by law.

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