Senior Backend Software Engineer

Sr. Software Engineer

Our Mission:

6sense's mission is to multiply what matters: growth, retention, and efficiency.  We envision a future where companies, teams and people reach their full potential.

Our People:

People are the heart and soul of 6sense. We serve with passion and purpose. We live by our Being 6sense values of Win as One Team, Stay Curious, Do The Right Thing, Own the Outcome, and Create Belonging.  Every 6sensor plays a part in defining the future of our industry-leading technology.  6sense is a place where difference-makers roll up their sleeves, take risks, act with integrity, and measure success by the value we create for our customers.  We want 6sense to be the best chapter of your career. 

Role Overview 

We are looking for a Senior Software Engineer (IC4) to take ownership of the high-scale backend services powering our advertising ecosystem. You will be responsible for building and optimizing the systems that handle millions of events every day and interface with our third parties. This role requires a deep specialist in Python/Django who is equally comfortable diving into Big Data pipelines and ensuring our designs are performant, consistent, and scalable. 

Core Responsibilities 

• Technical Ownership: Lead the development and maintenance of mission-critical backend services, ensuring high throughput and low-latency of APIs. 
• Backend Optimization: Write clean, efficient, and highly performant code in Python and Django. You will be the go-to person for solving complex concurrency issues and optimizing service performance. 
• Big Data Execution: Design and optimize data workflows. You will write and tune complex queries in Hive, Flink, or Trino to ensure our data processing is both fast and cost-effective. 
• Cross-Stack Collaboration: Collaborate with Front-End engineers to ensure client-facing features are designed for maximum data fidelity and backend compatibility. 
• AI Implementation: Work closely with leadership to implement AI/ML-driven features, such as automated anomaly detection or predictive data cleaning, within our production pipelines. 
• Mentorship: Provide thoughtful code reviews and technical guidance to mid-level engineers, fostering a culture of technical excellence. 

Technical Requirements 

• Experience: 6–9 years of professional backend experience, with a significant portion spent in high-scale environments (Ad-Tech, Data-heavy SaaS, or FinTech). 
• Python/Django Specialist: Mastery of Python and the Django ecosystem, including experience with asynchronous task processing (Celery/Redis) and database optimization. 
• Big Data Proficiency: Hands-on experience with distributed data processing frameworks like Flink, Spark, or Hive. You know how to handle "data drift" and optimize large-scale joins. 
• SQL & Query Performance: Advanced SQL skills. You should be able to optimize complex analytical queries and understand database internals (indexing, partitioning). 
• FE Awareness (Good to Have): Familiarity with Front-End system design (e.g., React, JS event-loops) and how client-side tracking impacts backend data integrity. 
• AI/ML Exposure: Practical experience or strong interest in deploying AI models into production environments to solve operational challenges. 

Our Benefits: 

Full-time employees can take advantage of health coverage, paid parental leave, generous paid time-off and holidays, quarterly self-care days off, and stock options. We’ll make sure you have the equipment and support you need to work and connect with your teams, at home or in one of our offices. 

We have a growth mindset culture that is represented in all that we do, from onboarding through to numerous learning and development initiatives including access to our LinkedIn Learning platform. Employee well-being is also top of mind for us. We host quarterly wellness education sessions to encourage self care and personal growth. From wellness days to ERG-hosted events, we celebrate and energize all 6sense employees and their backgrounds. 

Equal Opportunity Employer: 

6sense is an Equal Employment Opportunity and Affirmative Action Employers. Qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender perception or identity, national origin, age, marital status, protected veteran status, or disability status. If you require reasonable accommodation in completing this application, interviewing, completing any pre-employment testing, or otherwise participating in the employee selection process, please direct your inquiries to jobs@6sense.com. 

We are aware of recruiting impersonation attempts that are not affiliated with 6sense in any way. All email communications from 6sense will originate from the @6sense.com domain. We will not initially contact you via text message and will never request payments. If you are uncertain whether you have been contacted by an official 6sense employee, reach out to jobs@6sense.com 

Experience Level

Senior Level