Senior Software Engineer
Fonzi
Fonzi Match Day is where full stack engineers who actually build things meet the companies worth building for. No job boards. No recruiter spam. Companies request to interview you and submit salary bids upfront. Every week, hiring managers at 100+ pre‑vetted startups in NYC and San Francisco review a curated group of engineers. They read profiles optimized by our team to surface what matters: what you’ve built, how you think about systems, and whether you’re the kind of engineer who ships. Companies on Fonzi are building AI‑native products, scaling complex web applications, and shipping features end‑to‑end from database to UI. Backed by a16z, Sequoia, General Catalyst, Y Combinator, and more. How It Works Apply in 2 minutes. We reach out, learn what you’re building and what excites you, and optimize your profile. Hiring managers review the cohort and request interviews with candidates they want. Companies submit competing salary bids directly to you. You only interview where you’re genuinely interested. Completely free + we have an iMessage agent plus humans in the loop you can text anytime for scheduling and coordination. Who We’re Looking For Engineers who own features end‑to‑end, from API design to frontend polish. Comfortable making architectural decisions across the stack and shipping fast without sacrificing quality. Have worked in environments where you had to figure out what to build, not just how to build it. 2–8 years of experience, ideally with time at a high‑growth company. Interview Process Most Fonzi companies run a lean, respectful process: a screening conversation focused on communication and genuine curiosity, a technical deep‑dive on architecture and system design, and then a coding or pairing session. If you’re an engineer who loves building across the entire stack and wants companies competing for your attention instead of the other way around, we want to hear from you. #J-18808-Ljbffr
- ...optimizing for both write throughput and in-memory footprint for each agent. What we’re looking for 7+ years of experience as a software engineer. Consistent record as primary individual contributor to several medium to large projects. Managed, designed and deployed...Senior
- ...A fast-growing SaaS company based in San Francisco seeks a Software Engineer for its New Products team. This hybrid role requires building first-of-its-kind technology that transforms an analog industry and improves lives. Candidates should have 5-10+ years of backend...Senior
- ...clear, reliable, and intuitive. You will design and build the product interfaces through which customers interact with the Policy Engine and our governance platform. This role sits at the boundary between product experience and system behavior. The quality of that boundary...Senior
$120k - $190k
...Senior Software Engineer Location: San Francisco, CA or Denver, CO (Hybrid, 3 days/week). Salary: $120k-$190k + equity. Full-time. Offstream is building the infrastructure for the environmental compliance market, think compliance software meeting real‑world industrial...SeniorFull time3 days per week$200k - $220k
...Help lead a team of engineers to design, ship, and maintain user-facing and backend product... ...on your understanding of AI trends and software development. You are prepared to guide a... ...execute towards those goals. Role As a Senior Engineer at Pickaxe, you will design and...SeniorFull timeWork at officeRemote work- ...monitoring to ensure agent ecosystems remain trustworthy, compliant, and efficient at scale. Role Overview We are seeking a Senior Software Engineer to design, build, and own core backend and distributed systems that power Alterion’s platform. This is a hands‑on role for...Senior
$191.36k - $287.04k
...Role Overview: We are looking for a high-impact Senior Software Engineer with strong expertise in backend development. The ideal candidate should have deep experience building scalable APIs, distributed systems, platforms, or engineering frameworks. You will play a key...Senior- ...Senior Software Engineer San Francisco • Hybrid • Full-time About BackOps AI BackOps AI is transforming supply chain operations with agentic AI solutions that automate complex workflows, freeing operations teams to focus on what matters most. Headquartered in the San...SeniorFull timeRemote workFlexible hours
- EvenUp is seeking a Senior Software Engineer in San Francisco (hybrid) to address critical issues and enhance product reliability. In this role, you will resolve high-severity customer issues, lead cross-functional collaboration, and contribute to overall product improvement...Senior
- ...Software Engineer 5+ years of experience in software engineering. Experience writing code in JavaScript/TypeScript, HTML5, CSS3, or related applications. Experience with front-end technologies and frameworks, preferably React. API design and development experience. Node...SeniorWork experience placement
- ...to technical rigour and code quality across the Volcano codebase What You\'ll Bring The Toolkit 5+ years of production front-end engineering experience, with a demonstrable track record of owning UI systems end-to-end Server-side rendering expertise — deep, practical experience...SeniorWork experience placementShift work
$187.57k - $211k
Senior Software Engineer, Mobile (hybrid) Job Function Software Engineering Description Nuna Incorporated in San Francisco, CA seeks a Senior Software Engineer, Mobile. The role involves developing software that delivers innovative new mobile experiences. Some telecommuting...SeniorRemote work- ...future where every home in the U.S. is powered sustainably. Our software drives electrification and high‑efficiency technologies,... ..., MCJ, and the founders of Aurora Solar—we’re now growing our engineering team and looking for a passionate, driven software engineer ready...SeniorFor contractorsWork at office3 days per week
$203.4k - $235k
...stories and characters they crave. Join our team, and help us shape the future of anime! About the role We are seeking a Senior Software Engineer to join our LRX Core team, focused on building the shared architecture and foundational layers that power Crunchyroll experiences...SeniorTemporary workFlexible hours- ...Senior Engineer Location: SFO/Dallas/Austin/NJ - local candidates only Duration: Fulltime with Incedo About the team Core Platform development... ...science, strong competencies in algorithms, data structures, software design, and building large, distributed systems Experience in...SeniorFull timeLocal area
- ...world, helping business owners operate, increase sales, engage customers, and keep employees happy. Toast is looking for a Senior Software Engineer to join our Identity Management team to play a critical role in developing reliable code and algorithms in our user...SeniorWork at officeLocal areaFlexible hours2 days per week
$170k - $230k
...Role Exists We are establishing our San Francisco office as a strategic center for high-bandwidth engineering and product innovation. This is a foundational role for a senior engineer who thrives in an in-person, collaborative environment and wants to be "in the room"...SeniorWork at officeLocal areaHome officeFlexible hours- A leading autonomous driving technology firm is seeking a Senior Software Engineer to architect evaluation methodologies for their simulator. The ideal candidate will have over 5 years of software development experience, proficiency in Python or C++, and a strong understanding...Senior
- Toast is hiring a Senior Software Engineer for the Identity Management team in Dublin. You will build reliable user management, authentication, and permission services, contributing to a SaaS platform used by millions of users. Join a collaborative, agile environment with...Senior
$201.88k - $237.5k
...and limited partners through world-class software, purpose-built for everyone in venture... ...Team You’ll Work With You’ll enter our engineering interview process as part of a pooled hiring... ...assets. The Problems You’ll Solve As a Senior Software Engineer II, you will lead...SeniorFull timeWork at office$133.3k - $303.6k
Dormont Manufacturing Co is looking for a Software Engineer for its New Products team in San Francisco. This hybrid role offers the opportunity to build and launch innovative products that significantly impact customers and the lives of victims. The ideal candidate will...Senior- Handshake is seeking a Senior Software Engineer on the Consumer Experience team to build the products that connect millions of students with employers. You will drive meaningful technical initiatives, shape the technical direction of the team, and deliver high-quality,...Senior
$166k - $267k
Pilot.com is looking for a Senior Software Engineer to join our Empowerment team in San Francisco. In this role, you will build customer-facing experiences, manage onboarding, and develop automation systems. The ideal candidate has over 5 years of experience, with proficiency...Senior- A technology company in San Francisco seeks a Staff Wireless Software Engineer to lead the development of mission-critical wireless systems. The role involves architecture and implementation of communication stacks and collaborating with cross-functional teams for system...Senior
- ...every cohort at Amplitude starts with a query. Our in‑house OLAP engine, Nova, processes trillions of events in real time—turning raw... ...operational rigor grows dramatically. We’re looking for a Senior Software Engineer who wants to go deep on the engine internals and the...SeniorWorldwideHome officeFlexible hours
$204k - $259k
Waymo is looking for a Senior Software Engineer to evaluate their simulator's performance and improve simulation accuracy. This role involves architecting evaluation methodologies and developing high-throughput data processing pipelines using Python or C++. The ideal candidate...Senior$230k - $340k
Baselayer is seeking a Senior Engineer in San Francisco to develop the most accurate identity graph for US businesses and consumers. You will own product features across data ingestion, normalization, and API development. The ideal candidate has experience with async Python...Senior$200k - $235k
...growing business with billions in revenue About The Role As a Senior Forward Deployed Engineer, you\'ll serve as a technical leader at the intersection... .... Desired Capabilities 5+ years of professional software engineering experience, with meaningful time spent in customer...SeniorFull timeFreelanceInternshipWork at officeRemote workFlexible hoursShift work$225k - $405k
Role: Senior Backend Engineer Our software solves all these problems (and more) at scale, and our Backend Engineers make it possible. Responsibilities Building systems that process and analyze millions of contracts reliably Designing pipelines that orchestrate LLMs,...Senior- Stackai is seeking a Senior Software Engineer to enhance enterprise identity and access management. You will deliver solutions for SSO, role-based access controls, and lifecycle management, enabling major clients to seamlessly adopt Stack AI. The ideal candidate has 4+...Senior
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