Senior Backend Software Engineer

Staff Software Engineer (Backend)

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. 

We’re looking for a Staff Software Engineer to serve as a technical pillar across our engineering teams. This role is ideal for a highly experienced backend engineer who thrives on solving hard problems, mentoring others, and guiding architecture across multiple domains. You’ll be a multiplier—operating independently, shaping technical direction, and partnering with engineers and product teams to raise the bar across the organization. 

You’ll work across squads to improve system performance, reliability, and scalability, while owning high-impact projects that support our Conversational Email (CE) platform. Whether it’s unblocking performance bottlenecks, leading design for new backend services, or reducing tech debt, your contributions will have far-reaching impact.

What You’ll Do :

• Own and lead design for major backend systems across CE, focusing on performance, scalability, and reliability
• Collaborate with multiple teams to address cross-cutting concerns (e.g., shared libraries, infra patterns, tech debt, security)
• Tackle escalated production issues, security vulnerabilities, and architectural decisions
• Contribute to and guide implementation of large features (e.g., platform-wide improvements, big bets within CE)
• Provide technical mentorship to engineers across levels and help raise the engineering bar
• Drive documentation, performance profiling, and system-level debugging practices
• Work with EM's and PM's to shape technical roadmap and support long-term platform health.

What We’re Looking For :

• 8+ years of experience in backend engineering with deep expertise in designing complex distributed systems
• Strong hands-on experience with Python, Ruby, and cloud platforms like AWS
• Excellent system design and architecture skills
• Comfortable debugging performance issues, tackling infra and security problems, and driving org-wide improvements
• Strong mentorship and communication skills, with a track record of influencing across teams
• Bonus: experience with SingleStore, email deliverability systems (e.g., SMTP), or platform architecture at scale

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