2,916 Founding Engineer jobs
Founding engineer roles building the first product at early-stage startups.
Senior Software Engineer
Senior Software Engineer building SpiceDB, AuthZed's open-source permissions database inspired by Google Zanzibar, and its surrounding open-source ecosystem. Day to day: designing and shipping distributed-systems features, troubleshooting correctness and performance, operating what you build (including on-call), and collaborating in the open with contributors. Core tech: Go (plus Python/Java), dis
Member of Technical Staff
Product engineer at Seamflow builds AI-powered workflow software for testing, inspection and certification bodies. Owns product surface end to end — interface, backend and data model — shipping dense, stateful workflows for enterprise users, in person from a London (Shoreditch) startup team.
Lead Mission Integration Engineer
Lead the mission integration team at Apex, a startup manufacturing satellite buses in Los Angeles: define end-to-end mission architecture and act as senior technical liaison for spacecraft missions in a ~50% management / 50% hands-on role. Core work spans orbital mechanics and trajectory analysis, coupled loads/thermal/EMC assessments, payload integration, and design reviews using tools like STK,
Senior Software Engineer (US Deployment/Relocation from Europe)
Senior engineer building and troubleshooting Bitmovin's Emmy-winning video encoding platform (Java/C++) at cloud scale, while serving as the US-based technical owner for top media customers during EU off-hours.
Senior Integration Engineer - Nuclear Process
Senior process/nuclear engineer at Thea Energy (a fusion startup) to define and integrate the process architecture of a first-of-a-kind fusion plant: developing PFDs, mass/energy balances, and system boundaries and interfaces, and aligning tritium/fuel-cycle, vacuum, cooling, and utility systems across engineering disciplines.
Senior Software Engineer, Java (Hybrid, Denver Metro Preferred)
Senior individual contributor building FusionAuth's Java-based customer identity and access management (CIAM) platform end to end — designing and shipping secure, well-tested features, reviewing and mentoring, and debugging concurrency issues across self-hosted and cloud deployments. Core tech: Java, OAuth/OIDC/SAML, relational databases, Kubernetes, and AI-assisted dev tooling.
Senior Software Engineer
Senior Software Engineer on Upbound's Spaces team, building and operating multi-control-plane management software for the Upbound Platform. Day-to-day involves writing Go controllers/operators against the Kubernetes API, running multi-tenant SaaS in production (on-call, debugging, observability), and contributing to open-source projects like Crossplane.
Senior Software Engineer
Senior Software Engineer on Upbound's Spaces team, building and operating multi-control-plane management software for the Upbound Platform in a multi-tenant SaaS. Day-to-day involves writing Go code against the Kubernetes API (operators/controllers), debugging production and customer environments, improving observability, and participating in an on-call rotation, plus contributing to the Crossplan
Software Engineer - Data Infrastructure
About Maxima Nobody went into accounting to spend the first week of every month matching transactions by hand. Maxima was built so they don't have to. Our agents do the accounting work itself: journal entries,…
Software Engineer, New Grad
Perpay is hiring new-grad software engineers in Philadelphia to develop, test, and release fullstack features for its consumer fintech products (marketplace, credit building, credit card). Day-to-day involves coding in Python/Django and React, code reviews, and cross-functional collaboration — 100% onsite in center-city Philadelphia.
Senior IT Systems Engineer
Senior IT role at a remote game studio managing SaaS infrastructure through code. You will own M365, Entra ID, and Cloudflare using Terraform and PowerShell, while also providing hands-on remote support and managing IT administration and subscriptions for a team of 30.
Senior Software Engineer
Build and scale backend systems for a fintech startup that moves money globally using blockchain rails, APIs, and distributed infrastructure.
Lead Distributed Systems Engineer
Lead the architecture and team building an edge data distribution system for Cape's private 5G networks, synchronizing subscriber data from the cloud to nodes that may be offline for weeks. Hands-on distributed systems work (replication, consistency, conflict resolution, security in untrusted environments) plus team leadership, using event-driven tech like Kafka, SQS, MQTT, RabbitMQ, Flink, or Spa
Member of Technical Staff, Cell Therapy
Serve as Latch's cell & gene therapy scientific authority: author and ship the Cell-Therapy-TxBench and Gene-Therapy-TxBench AI benchmarks, act as final reviewer on claims in these modalities, and potentially run wet-lab drug programs and CRO experiments. Full-time, in-person in San Francisco; $250k–$400k total compensation plus equity.
Staff Software Engineer
Staff Software Engineer at Casca, an early-stage startup building AI-native automation for banking. The role is ~70% hands-on coding and 30% technical leadership, driving architecture and mentoring while shipping SaaS features on TypeScript, React, Next.js, Postgres/Prisma, Python, and AWS from their San Francisco office.
Senior Software Engineer
Senior software engineer at Casca, an early-stage startup building AI-native automation for banking. The role is ~70% hands-on coding with end-to-end ownership of components (architecture through deployment and observability) plus stakeholder collaboration, using TypeScript, React, NextJS, Postgres/Prisma, Python, and AWS.
GNC Software Engineer (Mid-Level to Senior)
Designs guidance, navigation, and control systems for Astro Mechanica's clean-sheet autonomous supersonic aircraft — building 6-DOF dynamics/simulation models, control-design and Monte Carlo tooling, and supporting flight and ground tests. Core stack: Rust or C++ systems code plus Python for analysis, on-site in San Francisco.
Sr. Robotics Software Engineer
Senior Robotics Software Engineer at 4AG Robotics builds the perception, control, and autonomy software for its mushroom-harvesting robots — depth-camera detection, soft-gripper picking, localization, and fleet diagnostics — using C++, Python, and robotics tooling like ROS2. Remote within Canada, with occasional travel and encouragement to relocate to Salmon Arm, BC.
Software Engineer, Product
Product software engineer at Numeric, a startup building an AI-first accounting and finance platform used by companies like Anthropic and Brex. The role is in-person in San Francisco and involves end-to-end ownership of the data platform (ingestion, reporting, monitoring), automation engines (accounting, cash matching), and AI/workflow layers.