Senior Software Engineer (San Francisco Bay Area)

Senior Software EngineerBuild foundational systems behind real‐world decisionsFull‐time · Hybrid- (San Francisco)$225K–$300K + meaningful equityThe OpportunityAn extremely well‐funded, YC‐backed Series A start-up is building a next‐generation platform that sits at the intersection of data, automation, and high‐stakes decision‐making.The product is already live, widely used, and growing quickly. The next chapter is about deepening the platform, scaling carefully, and raising the technical bar across systems that must be reliable, explainable, and correct.This is a role for Senior / Staff engineers who want to work close to the core.Why This Role Is DifferentSubstantial ownership: You'll take responsibility for meaningful parts of the platform, from design through execution.High trust environment: Small, senior team. Few layers. Real autonomy.Clear impact: Your work directly influences outcomes that matter to end users and customers.Strong compensation: Competitive cash at Series A plus meaningful equity.Practical interviews: Real‐world system design and problem‐solving, no algorithm games.What You'll Work OnCore application and platform systemsComplex backend and data heavy workflowsScalable services operating in a regulated or sensitive contextAccuracy critical logic where edge cases matterCross‐stack problem solving, with a backend leaning focusThe problems are nuanced, the constraints are real, and the solutions need to hold up over time.Requirements:You're likely a strong fit if you:Have 8+ years of professional Full Stack software engineering experience – with a Backend LeanHave TypeScript, React.js, Node.js, Python - Experience with data driven or intelligent systems is helpful but not requiredHave owned or significantly shaped production systemsHave experience working on Complex Backend systems at Infrastructure levelAre comfortable making architectural trade-offs with incomplete informationHave experience in early‐stage or fast‐moving environmentsAre self‐directed, communicative, and pragmaticPrefer building durable systems over shipping throwaway codeIdeally have some experience with AI/ML – Chatbots/ fine-tuning models etcComputer Science Degree is a bonus.The Environment~30 people total, lean senior engineering teamRevenue‐generating, well‐capitalized, and growingMultiple senior hires plannedOn‐site collaboration in San FranciscoThe Bottom LineThis is a role for engineers who want to:Own meaningful technical decisionsWork on systems that actually get usedBe paid competitively for senior‐level impactBuild something substantive alongside other strong engineersA high‐quality opportunity for the right person.Apply now – Candidates must be US Citizens. No Sponsorship available.