Senior Software Engineer (Backend), Deliverability

Front is the customer operations platform built for B2B complexity, keeping every team, tool, and customer conversation in sync so companies can scale without losing connection. Others handle simple interactions. Front handles the coordination and context behind complex B2B customer relationships. Over 9,000 companies, including Uber Freight, Navan, and Stripe, rely on Front because it's the only one that can run the operational layer that makes customer-facing work actually succeed. Backed by Sequoia Capital and Salesforce Ventures, Front has raised $204M from leading venture capital firms and independent investors including top executives at Atlassian, Okta, Qualtrics, Zoom, and PagerDuty. Front has received numerous Great Place to Work accolades, including Built In's 100 Best Midsize Places to Work in SF 2025 , Top Places to Work by USA Today 2025 , Y Combinator's list of Top Companies in 2023 , #4 on Fortune’s Best Workplaces in the Bay Area™ , Inc. Magazine's 2022 Best Workplaces list , and Forbes Best Startup Employers 2022 List . We're looking for two experienced backend Software Engineers to join our Deliverability team in San Francisco. This team is responsible for the core systems that power Front - the pipeline that connects Front to the external world - which process tens of millions of events delivering emails, SMS, and other messages to and from Front quickly and reliably. You'll own critical infrastructure that our customers depend on and take on a technical leadership role within the team, building upon our deliverability systems that need to be performant, scalable and reliable, all at once. What will you be doing? Serve as a technical lead on the Deliverability team, driving the architecture and execution of major infrastructure and product projects Own and improve high-volume email infrastructure and decisioning systems spanning ingestion, routing, and outbound delivery, driving deliverability outcomes at scale Own key services that power Front and lead architectural evolutions to build for reliability and scale Collaborate with other systems and infrastructure teams to build upon next-generation architecture Collaborate closely with product managers, product designers and other engineers to conceptualize, build, and test new product features What skills and experience do you need? 5+ years of professional software engineering experience Strong experience building and operating high-scale, distributed backend systems Comfort owning complex systems and making architectural decisions with real production impact A collaborative, low-ego approach to engineering and cross-team partnerships Experience with on-call responsibilities and a strong sense of ownership over system reliability Product mindset, building scalable and extensible solutions that meet customer requirements Fluency in a dynamic language like Javascript (Typescript), Python, Ruby, or similar Strong track record of launching and delivering projects of significant complexity and high level of ambiguity Experience architecting, deploying and operating asynchronous work queues, high-volume storage systems, or high-throughput systems Understand the trade-offs in employing different engineering solutions to a problem, valuing pragmatism over idealism Ability to thrive in a dynamic, fast-paced, collaborative, and high-growth environment Nice to have - Prior experience at a B2B SaaS or customer communications company Familiarity with email sending at high volume (millions of messages/day) Experience with DNS infrastructure Experience working on software systems built on Amazon Web Services Deep knowledge of the email stack and assorted RFCs Experience with anti-spam infrastructure to prevent bad actors from exploiting an email service Built deep integrations with an email delivery service like SendGrid, MailGun, Mandrill or SparkPost Experience with Gmail or Office 365 APIs Experience with Kafka Front operates on a hybrid model — we come together in the office each Tuesday, Wednesday, and Thursday to collaborate and stay connected. What we offer Competitive salary Equity (we are post-series D & backed by some of the best VCs in the US) Private health insurance, including plan options at no cost to employees Paid parental leave Flexible time off policy Flexibility to work from home Monday and Friday, unless posted as a fully remote role Mental health support with Workplace Options Family planning support with Maven $100 per month Lifestyle Stipend to spend on fitness, health and wellness, and other activities Wellness Days - Fronteers get an additional day off on months with no holidays Winter Break - Our offices are closed from Christmas to New Year's Day! Front provides equal employment opportunities (EEO) to all employees and applicants for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age or disability. By applying, you acknowledge and agree that you have read and understand the California Recruiting Privacy Notice & EU Privacy Notice