Synapto | Payments | Remote (EU) | €80-120k + meaningful % | Early-Stage (5 folks)

We're well funded, have a healthy sales funnel, and already processing payments for our customers in production. We're a Java/gRPC/jOOQ shop focused on simplicity, flexibility and quality.

Assorted things to be built: billing (invoices, subscriptions, taxes), split-payments (account boarding, ledgers, payout, etc.), developer tooling (api/webhooks/idempotence/rate limiting/etc).

More info here: https://wellfound.com/l/2bpyra, please apply with your CV on the link.

Zenact AI | Founding Engineers & Interns | Full-Time + 6-Month Internships | Onsite Bangalore | Location flexible for internships (India)

Tech: Golang • Python • AI Agents

At Zenact AI, we are building AI agents that test apps like real users. I personally faced this problem at Zomato for over 6 years while handling many bugs and incidents.

We launched recently and already got 35+ signups from leading unicorns & soonicorns in India.

Backed by the Zomato mafia.

Team comes with deep expertise from Zomato’s scale journey.

Roles:

Founding Engineers.

Interns (6 months). Must’ve built serious projects or freelanced early in college.

You’ll work on:

* Building the platform from the active feedback from the customers, with heavy focus on improving the end to end latency of testing.

* Fine-tuned vision & reasoning models (currently 92% accuracy vs SOTA ~60%)

* AI agents for mobile testing, reasoning flows.

Apply: shoot a mail to Email is hidden or fill form here: https://forms.gle/ywpromowha4zf4gv6

Pocketflows | Founding engineers | Full time | In person - San Francisco, CA | www.pocketflows.com | Comp: 180k - 225k

Want to build AI that will impact SMBs in real-life industries that power the backbone of our economy? Come join Pocketflows - we help SMBs grow by offering a marketing platform embedded inside the software they already use today.

We've signed on and launched with incredible SMB platforms. You'll have the opportunity to build important workflows that help hundreds of thousands of SMBs

Founders have prev built out both frontier marketing products (Qualified) and embedded API products (Stytch, Gusto Embedded)

We’re both from the midwest and are huge believers in main street businesses (our end users at Pocketflows). Long before our tech careers started, our first jobs were at mom & pops' in our hometowns!

Well-funded by investors who believe in our mission and SMB tech, and an incredible network of angels & advisors who have built and scaled SMB tech platforms

More info here: https://ext-pocketflows.notion.site/

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...

Paratus | Founding Engineer | Onsite (SF) | https://www.getparatus.com

Paratus is building the Linear for military units.

Our mission is to redefine how military teams stay ready for their most urgent missions. We’ve raised $2.5M from top investor behind companies like Palantir and OpenGov to build the next-gen operating system for daily military collaboration. We’re hiring a founding engineer who is eager to work directly with service members on problems that matter. JD and more details here:

https://app.dover.com/jobs/getparatus

Falconer | Founding team (AI, infrastructure) or early-career engineers (any) | Bay area, hybrid/onsite | $125-250k

Falconer is building AI-powered knowledge tools for engineers. Knowledge management is a $30b industry, and we intend to build the tools that leverage AI to power the next generation of engineering knowledge. Our vision is to empower every engineer to write as well as the best technical writers, and enable every organization to have internal docs as great as the best external docs are.

We're currently a team of 5 from Stripe and Meta, prototyping the product with design partners, and hiring a few more engineers to round out the founding team. We've raised a $5m seed round and have several customers lined up, we just need to build it!

Apply at https://falconer.ai/careers, or drop your resume and a sentence or two about what AI knowledge workflows you would be excited to work on to Email is hidden!

Clerq | Senior/Staff Engineer | onsite (NYC) | https://clerq.io

Clerq is a NYC based fintech startup building the next generation platform payments platform delivers a seamless checkout experience for high-ticket transactions. By leveraging modern bank rails, the platform offers the conversion and UX benefits of cards with risk and money movement infrastructure purpose-built for large purchases. Clerq replaces outdated manual payment methods like cash, checks and wires and expensive card surcharges with a smooth, integrated solution that helps merchants convert more customers without sacrificing margins.

We have started with the $1T+ U.S. auto vertical, where our platform is already powering payments for several of the most recognized brands in the industry. With proven traction, the company has expanded into high-growth adjacencies including high-ticket e-commerce, private travel and powersports.

We are a lean team right now of 3 engineers so are looking for a senior or staff level engineer who is excited by big opportunities and eager to ship.

Stack: Python/Django, React, Nodejs, AWS Comp: $180-210k + Equity

Email me at Email is hidden if you are interested in hearing more!

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 Email is hidden. 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/senior-fullstack-engineer-1...

Findigs | Full-time | NYC | 3x/week in office

At Findigs, we’re transforming the rental experience — making it fairer, stress-free, and more convenient by changing the fundamentals of renting.

We build high-scale applications that streamline renting for millions. Our modern tech stack includes TypeScript, Python, Node.js, React, and scalable cloud infrastructure. We foster a collaborative culture where engineers have high ownership and autonomy, taking features from concept to deployment.

Join our sharp, supportive, and mission-driven team in our newly renovated SoHo/NoHo office.

Open role:

Senior Software Engineer ($180k - $210k) —> Apply here (https://jobs.lever.co/findigs/3b39616d-223f-4326-a500-f804c3...)