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Sr Backend Python Developer Jobs in California (NOW HIRING)

Pentera

Senior Backend Engineer

Los Angeles, CA · On-site

$180K - $210K/yr

Strong proficiency in Java or Python * Proven experience designing and operating backend systems ... Why Pentera At Pentera, senior backend engineers remain deeply hands-on while working on systems ...

FlexAI

Senior Backend Engineer

Santa Clara, CA · On-site

$180K - $225K/yr

Work with DevOps/SRE on CI/CD, deployment automation, and scalability * Contribute to architecture ... Golang (Primary), Python (Secondary) * Infrastructure: Kubernetes, Docker, Cloud (AWS/GCP/Azure)

eTouch Systems

Senior Python Developer

San Jose, CA

$142.40K - $191.60K/yr

Senior Python Developer Looking for a passionate Python developer who is excited about joining a team that is execution oriented, fast moving, and running on agile methodology. Direct Client Location ...

Boxtro Llp 123

Sr. Backend Engineer

San Francisco, CA · On-site

If you're a smart, motivated developer with 4 - 6 years of proven, hands-on experience with the ... Python...the list goes on! You can experiment with installing/configuring/hacking Wordpress ...

Finvest

Senior Backend Engineer

San Francisco, CA · On-site

We are looking for a senior engineer to join our team in San Francisco. As one of the founding ... Fluent in Node/Typescript, Python, Postgres, and AWS * Proven ability to architect complex ...

Scribe

Senior Backend Engineer

San Francisco, CA · On-site

$175K - $200K/yr

One team one dream About this role We're looking for a Senior Backend Engineer to join our Core ... Python + Django * PostgreSQL * Redis * Celery + AmazonMQ * Infrastructure in Terraform (AWS ...

eTouch Systems

Senior Python Developer

San Jose, CA · On-site

$142.40K - $191.60K/yr

Senior Python DeveloperLooking for a passionate Python developer who is excited about joining a team that is execution oriented, fast moving, and running on agile methodology. Direct ClientLocation ...

Replo

Senior Backend Engineer

San Francisco, CA · On-site

$200K - $500K/yr

About the role Hiring a senior backend engineer to join our team and focus on system architecture ... If you have experience writing these systems in Python/Go/Java that's cool too, as long as you're ...

Commure

Senior Backend Engineer

Mountain View, CA · On-site

$170K - $230K/yr

We are looking for a talented Senior Backend Engineer to help us craft user-friendly, responsive ... Work across the entire technology stack, including but not limited to Python, Go, FastAPI, Flask ...

Nash, Inc.

Senior Backend Engineer

San Francisco, CA · On-site

Senior Backend Engineer San Francisco / Hybrid / Remote About Nash Logistics is the substrate ... Strong proficiency in Python and modern backend frameworks. Experience with Go or TypeScript is a ...

Commure Athelas

Senior Backend Engineer

Mountain View, CA · On-site

$170K - $230K/yr

We are looking for a talented Senior Backend Engineer to help us craft user-friendly, responsive ... Work across the entire technology stack, including but not limited to Python, Go, FastAPI, Flask ...

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What is the difference between Sr Backend Python Developer vs Backend Python Developer?

AspectSr Backend Python DeveloperBackend Python Developer
Required Experience5+ years, leadership skills1-3 years, technical skills
ResponsibilitiesDesigning architecture, mentoringImplementing features, coding
CertificationsOptional, often relevantOptional
Work EnvironmentTeam leadership, project planningDevelopment, coding tasks

The main difference between a Sr Backend Python Developer and a Backend Python Developer lies in experience, responsibilities, and leadership roles. Senior developers typically have more experience, oversee architecture, and mentor junior staff, while backend developers focus on coding and feature implementation. Both roles are essential in Python-based backend development within tech companies and share similar technical requirements.

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Senior Backend Engineer

Pentera

Los Angeles, CA • On-site

$180K - $210K/yr

Full-time

Medical, Retirement

Posted 7 hours ago

Job description

Description
Location:
Remote position. Occasional travel to our office in Golden, Colorado is required.
About Pentera
Pentera is the global leader in Automated Security Validation, enabling organizations worldwide to safely emulate real-world attacker behavior and uncover their true security gaps across SaaS, on-prem, cloud, and hybrid environments.
With more than 400 team members and over 1,100 customers in more than 50 countries, Pentera operates at scale and continues to shape how enterprises validate cybersecurity resilience. Our platform is trusted by security teams to challenge defenses, validate controls, and drive meaningful security outcomes.
At Pentera, backend engineers build and operate production-grade systems that sit at the core of our customers' security workflows.
About the Role
We are looking for a senior, hands-on Backend Engineer to join our Application team and help build the core systems behind Pentera's automated security validation platform.
In this role, you will work on large-scale backend services that support our SaaS and on-prem products, including systems that enable intelligent automation and data-driven decision-making across the platform. You will take ownership of complex backend components and contribute to technical decisions that shape how the platform evolves at scale. This is a role for an experienced individual contributor who enjoys deep technical challenges, end-to-end ownership, and building reliable systems in a highly complex domain.
Roles and Responsibilities
  • Own the design, development, and maintenance of core backend services for Pentera's SaaS and on-prem platforms
  • Build scalable, secure, and high-performance backend solutions that support enterprise-scale usage
  • Develop and maintain RESTful APIs and microservice-based architectures that enable complex product workflows
  • Take end-to-end ownership of features, from design and implementation through testing, deployment, and production monitoring
  • Contribute to architectural discussions and technical decision-making as a senior individual contributor
  • Collaborate closely with frontend engineers, product managers, QA, and research teams to deliver high-quality solutions
  • Review code and provide thoughtful, constructive feedback to uphold engineering standards
  • Investigate and resolve complex production issues and performance bottlenecks
  • Continuously improve backend reliability, scalability, and maintainability

Requirements
  • 7+ years of experience as a Backend Engineer in an Agile development environment
  • Bachelor's degree in Computer Science or a related technical field, or equivalent practical experience
  • Strong proficiency in Java or Python
  • Proven experience designing and operating backend systems using RESTful APIs and microservice architectures
  • Deep understanding of object-oriented design principles, design patterns, and writing clean, maintainable code
  • Experience working with NoSQL databases such as MongoDB (Atlas)
  • Hands-on experience working in cloud environments, preferably AWS
  • Strong problem-solving skills, attention to detail, and a proactive approach to troubleshooting
  • Clear communication and strong collaboration skills

Preferred Skills
  • Experience with additional backend languages such as Python, Go, or Node.js
  • Experience working with Docker and containerized environments
  • Familiarity with Linux environments and security-related concepts
  • Experience working with graph databases such as Neo4j
  • Exposure to security-focused tooling or penetration testing frameworks

Compensation
The base salary range for this role is $180,000-$210,000, depending on experience, skills, and location. This range reflects base compensation only. In addition, Pentera offers a comprehensive total rewards package that includes performance-based bonuses and stock options as part of our long-term incentive plan, along with health and wellness benefits, retirement plans, and additional perks designed to support long-term growth and well-being.
Why Pentera
At Pentera, senior backend engineers remain deeply hands-on while working on systems that matter. The services you build are used daily by security teams around the world to validate defenses and make informed security decisions.
This role offers technical ownership, complex engineering challenges, and the opportunity to influence the evolution of a mature, widely adopted platform without moving into people management.
We are an equal opportunity employer and we are committed to building a diverse and talented workforce. We do not discriminate on the basis of race, sex, religion, colour, national origin, gender, gender identity, sexual orientation, age, marital status, veteran status, medical condition, disability, or any other class or characteristic protected by applicable law. We welcome candidates from all backgrounds to join us!

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