Proof (Defend team) | Senior Software Engineer (full-stack) | Remote (US timezones)

Proof is a digital trust platform. We do online notarizations, e-sign, KYC, identity network, PKI. Defend team is building advanced fraud detection and prevention service for use across the platform. Proof is a 10 year mid-size startup with solid history, collaborative culture, hundreds of customers and millions of users across all verticals.

Stack: Ruby on Rails, React, GraphQL, AWS

https://jobs.lever.co/proof/ee82bcf8-d3c6-4740-8a9e-bd1e5dc9...

Carbon AI | Founding Eng | Remote-first (US) | https://carboncre.ai/

- Product: AI-automated commercial real estate workflows to tackle necessary but mind-numbing tasks that human analysts typically perform.

- Funding. $4m seed round from Bling Capital, who also funded the last startup my cofounder and I created in the same space (exited to Built Technologies, which represents 10% of all US construction spend)

- Traction. We’re still building out the product, but have design partnerships with 4 prominent firms in our space, who together comprise 25% of the market we’re targeting.

- Team. You'd be joining as Eng #2 to pair with our Founding AI Eng. In addition to me and my cofounder, Josh, we also have 3 ex-Google/Uber contractors helping us build faster. Our plan is to transition all development in-house though.

- Tech stack. TypeScript, React, NodeJS, Express, GraphQL, Postgres

- Comp. $175-225k base + above-market equity.

Note that while this is a remote-first role, we value having some in-person collaboration so we’d be looking for you to visit our office in Philly ~1x/month.

JD: https://glamorous-sloth-8e8.notion.site/Founding-Full-Stack-...

Feel free to message me directly at jeff.saul@carboncre.ai. Thanks!

Absinthe Labs | Senior Full-Stack Engineer | Remote or NYC Hybrid

Absinthe Labs is making loyalty markets more efficient. With over 20M visits and 2M+ users since our founding in 2022, we built the first Web3-native customer data platform that powers points programs across the digital landscape, and we’re now seeking a Senior Full-Stack Engineer with a love of FE to expand our capabilities.

Role Highlights:

Platform Development: Design and build user-centric interfaces for incentive designers using Radix UI, Tailwind CSS, and Next.js, ensuring scalable backend services using Node.js and GraphQL. Data Architecture & APIs: Develop data pipelines, integrated with Hasura (GraphQL), PostgreSQL/DuckDB, and optimize our server-side logic for high-performance data retrieval. Dynamic Builder Tools: Engineer zapier-like interfaces to configure data sources and build a WYSIWYG loyalty portal editor. End-to-End Product Ownership: Architect, deploy, and maintain services across the stack, ensuring secure SSR and swift API interactions.

What You Bring:

Experience: 5+ years in full-stack engineering, ideally in B2B SaaS, Fintech, or Web3 consumer apps. Frontend: Strong experience in React, Next.js, and transforming Figma prototypes into polished UIs using Radix UI, Tailwind CSS, and shadcn. Backend: Proficiency in Node.js, GraphQL (Hasura) and designing secure, scalable backend architectures. Cloud & Security: Familiarity with AWS (Amplify, Cloudfront), containerization (Docker/Podman), and security best practices (e.g., CORS, CSP). DevOps & CI/CD: Experience with automating deployments, optimizing database queries, and maintaining a smooth developer experience using modern CI/CD pipelines. Startup Agility: Thrive in a fast-paced, impact-driven environment.

Why Absinthe Labs?

High-Impact Work: Join a tight-knit team shipping Web3 loyalty infrastructure that directly influences millions of users. Flexibility: Work remotely or from NYC Hybrid. Compensation: Competitive salary (region-based) + equity in a high-growth Web3 startup.

Apply Here: https://absinthelabs.notion.site/135dfbd9a95880c38129f055c38...

Boost My School | Senior or Staff Software Engineer | Full-time | Remote, USA only | $157-$204K salary | $17-23K bonus

Love building a product that improves a user’s life so much that they can’t help but share it with their peers?

Boost My School is on a mission to help schools fund brighter student futures. Our platform is trusted by 200+ K-12 schools to modernize their fundraising, events, and auctions.

Why work at Boost?

1. We make meaningful impact helping schools and students

2. We win as part of a thoughtful and collaborative team

3. We embrace ownership over our work, growth, and time

For full job details and instructions on how to apply: https://boostmyschool.com/careers#senior-software-engineer

Leadership team you'll be working with:

- CEO, coded first version of product (https://www.linkedin.com/in/holman-gao)

- Head of Product, ex Apple, Flexport, Stanford CS (https://www.linkedin.com/in/nathaniel-okun)

Tags: edtech, fintech, social impact, mission-driven

Stack: Ruby, Rails, React, GraphQL, Typescript

Comulate | Senior Engineer (3+ YoE) | ONSITE in San Francisco, CA

We're building automation software for the $7T insurance industry, accelerated by AI. Seed stage in terms of headcount (~ 20 people) but Series B in terms of business traction (+ cash-flow positive). We've intentionally stayed under the radar.

- Product has caused customers to literally cry tears of joy

- Experienced eng team from Airbnb / Brex / LiveRamp

- Stack: TS, Postgres, React, GraphQL, and Next.js

Apply here: https://comulate.com/careers

Altira Health | Remote (US) | Full-time | Founding Software Engineer | https://www.altirahealth.com/

We're building an AI care platform to reduce ER visits, close care gaps, and guide patients to the right care at the right time. We're a stealth-stage healthcare startup working with major providers to drive real outcomes. We just closed our pre-seed round and have great runway; at the same time, we're moving fast. We also believe in compliance and security from day 0.

We're looking for a pragmatic generalist who is comfortable at any part of the stack.

Stack: Python, Django, GraphQL, AWS, TypeScript, React, Terragrunt/OpenTofu

Ideal: early-stage experience, interest in healthcare, thrives solving problems

Fair compensation + equity

JD: https://altirahealth.short.gy/altira-founding-eng

Apply by sending us a note at eng-hiring@altirahealth.com

Baton| Senior Full Stack Engineer | HYBRID |San Francisco, CA | Full-Time

Baton is building software to automate the $800B+ freight industry. We’re a small, fast-moving team inside Ryder (Fortune 500 logistics company), rethinking how freight moves with real-time visibility, automation, and AI.

We're hiring a Senior Full Stack Engineer to work across our Python/FastAPI + React/TypeScript stack. This is a hybrid role (Tues–Thurs in our Hayes Valley SF office). You'll own major projects across the stack, collaborate cross-functionally, and shape tools used at national scale.

What we offer:

- $200,000 – $250,000 base + bonus + long term cash incentives - Startup speed, enterprise scale - Modern stack (FastAPI, GraphQL, Postgres, AWS) - Perks: 401k match, ESPP, great office

Apply at: https://job-boards.greenhouse.io/baton/jobs/4623804007