Sr. Security Software Engineer, Application Security

Zscaler

About Zscaler Zscaler accelerates digital transformation to ensure our customers can be more agile, efficient, resilient, and secure. As an AI-forward enterprise, we are constantly pushing the envelope, leveraging the world’s largest security data lake to power our cloud-native Zero Trust Exchange platform. This innovation protects our customers from cyberattacks and data loss by securely connecting users, devices, and applications in any location. Here, impact in your role matters more than title and trust is built on results. We say, impact over activity. We seek innovators who actively use AI to amplify their impact and who thrive in an environment where we leverage intelligent systems to stay ahead of evolving threats. We believe in transparency and value constructive, honest debate—we’re focused on getting to the best ideas, faster. We build high-performing teams that can make an impact quickly and with high quality. To do this, we are building a culture of execution centered on customer obsession, collaboration, ownership, and accountability. We value high-impact, high-accountability with a sense of urgency where you’re enabled to do your best work and embrace your potential. If you’re driven by purpose, thrive on solving complex challenges, and want to be part of the team that’s helping to secure the AI age, we invite you to bring your talents to Zscaler and help shape the future of cybersecurity.    Role We are looking for a Sr. Software Developer to join our team. This is a Hybrid role, reporting to the Leader in the Tools & Technology Team in the ThreatLabz department. The Sr. Software Developer will be primarily responsible for designing, building, and maintaining client-side and server-side web applications, taking ownership of end-to-end feature modules and ensuring seamless communication between user-facing interfaces and backend infrastructure. Working within ThreatLabz, the world-class security research arm of Zscaler, this role contributes directly to hunting new threats and protecting millions of global users. What you’ll do (Role Expectations) * Build and scale server-side web applications, secure RESTful APIs, and microservices using Node.js, Python, Django, or Flask * Manage core application security settings, user authentication, authorization protocols, and data protection measures * Map and optimize database schemas using relational systems like PostgreSQL or MySQL and NoSQL engines like MongoDB * Build responsive, high-performance user interfaces and reusable frontend modules utilizing HTML5, CSS3, JavaScript/TypeScript, and modern frameworks * Collaborate closely with the ThreatLabz Cyber Threat Research organization to conduct code reviews, perform unit testing, and maintain software applications Who You Are (Success Profile) * You thrive in ambiguity. You're comfortable building the path as you walk it. You thrive in a dynamic environment, seeing ambiguity not as a hindrance, but as the raw material to build something meaningful. * You act like an owner. Your passion for the mission fuels your bias for action. You operate with integrity because you genuinely care about the outcome. True ownership involves leveraging dynamic range: the ability to navigate seamlessly between high-level strategy and hands-on execution. * You are a problem-solver. You love running towards the challenges because you are laser-focused on finding the solution, knowing that solving the hard problems delivers the biggest impact. * You are a high-trust collaborator. You are ambitious for the team, not just yourself. You embrace our challenge culture by giving and receiving ongoing feedback—knowing that candor delivered with clarity and respect is the truest form of teamwork and the fastest way to earn trust. * You are a learner. You have a true growth mindset and are obsessed with your own development, actively seeking feedback to become a better partner and a stronger teammate. You love what you do and you do it with purpose. What We’re Looking for (Minimum Qualifications) * Demonstrated curiosity and active exploration of AI tools, with a proven history of integrating new technologies like frontier LLMs and vibe coding into workflows to augment problem-solving * A minimum of 2-3 years of professional application development experience with proficiency in Python and backend frameworks including Django and Flask * Strong understanding of database systems like PostgreSQL and MongoDB, alongside hands-on experience with Object Relational Mapper libraries * Expertise in frontend development with HTML5, CSS3, JavaScript, jQuery, and AngularJS * In-depth knowledge of the ELK Stack, including cluster setup, Logstash configuration, Kibana visualizations, Elastic beats, and core Elasticsearch concepts What Will Make You Stand Out (Preferred Qualifications) * Competency in Python-based data science tools such as pandas and NumPy, and experience implementing machine learning algorithms to optimize security solutions * Experience in Agile methodologies and version control tools such as GitHub, GitLab, or SVN * Familiarity with cloud services offered by major providers like AWS, Azure, or GCP #LI-Hybrid #LI-PM5 At Zscaler, we are committed to building a team that reflects the communities we serve and the customers we work with. We foster an inclusive environment that values all backgrounds and perspectives, emphasizing collaboration and belonging. Join us in our mission to make doing business seamless and secure. Our Benefits program is one of the most important ways we support our employees. Zscaler proudly offers comprehensive and inclusive benefits to meet the diverse needs of our employees and their families throughout their life stages, including: * Various health plans * Time off plans for vacation and sick time * Parental leave options * Retirement options * Education reimbursement * In-office perks, and more! Learn more about Zscaler's hybrid working model and benefits here. By applying for this role, you adhere to applicable laws, regulations, and Zscaler policies, including those related to security and privacy standards and guidelines. Zscaler is committed to providing equal employment opportunities to all individuals. We strive to create a workplace where employees are treated with respect and have the chance to succeed. All qualified applicants will be considered for employment without regard to race, color, religion, sex (including pregnancy or related medical conditions), age, national origin, sexual orientation, gender identity or expression, genetic information, disability status, protected veteran status, or any other characteristic protected by federal, state, or local laws. See more information by clicking on the Know Your Rights: Workplace Discrimination is Illegal link. Pay Transparency Zscaler complies with all applicable federal, state, and local pay transparency rules. Zscaler is committed to providing reasonable support (called accommodations or adjustments) in our recruiting processes for candidates who are differently abled, have long term conditions, mental health conditions or sincerely held religious beliefs, or who are neurodivergent or require pregnancy-related support.

Thumbtack

THUMBTACK HELPS MILLIONS OF PEOPLE CONFIDENTLY CARE FOR THEIR HOMES. Thumbtack is the one app you need to take care of and improve your home — from personalized guidance to AI tools and a best-in-class hiring experience. Every day in every county of the U.S., people turn to Thumbtack to complete urgent repairs, seasonal maintenance and bigger improvements. We help homeowners know which projects to do, when to do them and who to hire from our growing community of 300,000 local service businesses. If making an impact inspires you, join us. Imagine what we’ll build together. ABOUT THE BUSINESS APPLICATIONS ORG The Business Applications org builds and operates the internal systems that help Thumbtack run effectively at scale: Salesforce-centered workflows, admin tooling, and integrations that connect teams across the company. We are expanding that foundation into a broader internal platform for business workflows, with shared APIs, reusable integration patterns, and safe, auditable capabilities for business-critical actions. The org works closely with engineering and business partners to turn complex internal needs into systems that are easier to operate, extend, and automate responsibly. THE CHALLENGE Thumbtack's internal systems are becoming more connected, more automated, and more central to how teams serve customers, pros, and the business. Business Applications is helping drive that shift by turning Salesforce-centered workflows and operational tools into a broader internal platform for AI-enabled work. The challenge for this engineer is to build the backend services, APIs, and integration patterns that let agents and business systems take safe, auditable action across Thumbtack's internal ecosystem. This work will shape how teams move from one-off operational workflows to production capabilities that can be reused, extended, and trusted by the business. WHAT YOU’LL DO * Build backend services and APIs that connect Business Applications workflows with Thumbtack's product and platform services. * Bring agentic and AI-enabled workflow prototypes into production with the reliability, observability, and human review needed for business-critical work. * Create reusable integration patterns that let internal tools, third-party systems, and agents take safe, auditable action across systems. * Partner with business and engineering teams to understand operational workflows and turn the highest-value problems into durable backend capabilities. * Help define the technical foundation for a BusApps platform that supports reliable integrations, safe automation, and production AI workflows. IN ORDER TO BE SUCCESSFUL, YOU MUST BRING * Strong backend engineering experience building production services, APIs, or platform capabilities. * Technical judgment for integrations where reliability, security, data correctness, and audibility matter. * Ability to turn ambiguous operational workflows into clear technical designs that can be delivered incrementally. * Strong collaboration skills with engineering, business, and operational partners, especially when technical constraints and business needs need to be reconciled. * Comfort learning new domains quickly, including internal systems, third-party business applications, and AI-enabled workflows, with the judgment to know when automation needs human review. EXPECTED SALARY RANGES * For candidates living in San Francisco / Bay Area, San Jose, New York City, or Seattle metros, the expected salary range for the role is currently $210,800.00 - $272,800.00. * For candidates living in Austin, TX or Washington DC metros or in California, Massachusetts, New Jersey, or Washington states, the expected salary range for the role is currently $189,600.00 - $245,300.00. * For candidates living in all other US locations, the expected salary range for this role is currently $179,400.00 - $232,100.00. Actual offered salaries will vary and will be based on various factors, such as calibrated job level, qualifications, skills, competencies, and proficiency for the role. Thumbtack embraces diversity. We are proud to be an equal opportunity workplace and do not discriminate on the basis of sex, race, color, age, pregnancy, sexual orientation, gender identity or expression, religion, national origin, ancestry, citizenship, marital status, military or veteran status, genetic information, disability status, or any other characteristic protected by federal, provincial, state, or local law. We also will consider for employment qualified applicants with arrest and conviction records, consistent with applicable law. Thumbtack is committed to working with and providing reasonable accommodation to individuals with disabilities. If you would like to request a reasonable accommodation for a medical condition or disability during any part of the application process, please contact: recruitingops@thumbtack.com. For information about how Thumbtack collects, uses, and shares personal information about job applicants, please see our Job Applicant Privacy Policy. We put as much craftsmanship into candidate safety as we do into the hiring experience itself. While scammers may try to impersonate our team, we’ll never ask you for money, banking info, or SSNs during hiring. Check out our blueprint on how to spot the fakes.

Thumbtack

THUMBTACK HELPS MILLIONS OF PEOPLE CONFIDENTLY CARE FOR THEIR HOMES. Thumbtack is the one app you need to take care of and improve your home — from personalized guidance to AI tools and a best-in-class hiring experience. Every day in every county of the U.S., people turn to Thumbtack to complete urgent repairs, seasonal maintenance and bigger improvements. We help homeowners know which projects to do, when to do them and who to hire from our growing community of 300,000 local service businesses. If making an impact inspires you, join us. Imagine what we’ll build together. ABOUT THE BUSINESS APPLICATIONS ORG The Business Applications org builds and operates the internal systems that help Thumbtack run effectively at scale: Salesforce-centered workflows, admin tooling, and integrations that connect teams across the company. We are expanding that foundation into a broader internal platform for business workflows, with shared APIs, reusable integration patterns, and safe, auditable capabilities for business-critical actions. The org works closely with engineering and business partners to turn complex internal needs into systems that are easier to operate, extend, and automate responsibly. THE CHALLENGE Thumbtack's internal systems are becoming more connected, more automated, and more central to how teams serve customers, pros, and the business. Business Applications is helping drive that shift by turning Salesforce-centered workflows and operational tools into a broader internal platform for AI-enabled work. The challenge for this engineer is to build the backend services, APIs, and integration patterns that let agents and business systems take safe, auditable action across Thumbtack's internal ecosystem. This work will shape how teams move from one-off operational workflows to production capabilities that can be reused, extended, and trusted by the business. WHAT YOU’LL DO * Build backend services and APIs that connect Business Applications workflows with Thumbtack's product and platform services. * Bring agentic and AI-enabled workflow prototypes into production with the reliability, observability, and human review needed for business-critical work. * Create reusable integration patterns that let internal tools, third-party systems, and agents take safe, auditable action across systems. * Partner with business and engineering teams to understand operational workflows and turn the highest-value problems into durable backend capabilities. * Help define the technical foundation for a BusApps platform that supports reliable integrations, safe automation, and production AI workflows. IN ORDER TO BE SUCCESSFUL, YOU MUST BRING * Strong backend engineering experience building production services, APIs, or platform capabilities. * Technical judgment for integrations where reliability, security, data correctness, and audibility matter. * Ability to turn ambiguous operational workflows into clear technical designs that can be delivered incrementally. * Strong collaboration skills with engineering, business, and operational partners, especially when technical constraints and business needs need to be reconciled. * Comfort learning new domains quickly, including internal systems, third-party business applications, and AI-enabled workflows, with the judgment to know when automation needs human review. EXPECTED SALARY RANGES * For candidates living in Ontario and British Columbia, the expected salary range for the role is currently $180,200.00 - $233,200.00. Actual offered salaries will vary and will be based on various factors, such as calibrated job level, qualifications, skills, competencies, and proficiency for the role. Thumbtack embraces diversity. We are proud to be an equal opportunity workplace and do not discriminate on the basis of sex, race, color, age, pregnancy, sexual orientation, gender identity or expression, religion, national origin, ancestry, citizenship, marital status, military or veteran status, genetic information, disability status, or any other characteristic protected by federal, provincial, state, or local law. We also will consider for employment qualified applicants with arrest and conviction records, consistent with applicable law. Thumbtack is committed to working with and providing reasonable accommodation to individuals with disabilities. If you would like to request a reasonable accommodation for a medical condition or disability during any part of the application process, please contact: recruitingops@thumbtack.com. For information about how Thumbtack collects, uses, and shares personal information about job applicants, please see our Job Applicant Privacy Policy. We put as much craftsmanship into candidate safety as we do into the hiring experience itself. While scammers may try to impersonate our team, we’ll never ask you for money, banking info, or SSNs during hiring. Check out our blueprint on how to spot the fakes.