Booksy | Multiple | Remote | Full-Time | www.booksy.com

At Booksy, we're more than just the #1 booking app for beauty and wellness — we’re on a mission to empower small business owners around the world.

Every day, millions of customers rely on Booksy to book services and manage their routines — and thousands of service providers count on us to grow their businesses. As an engineer here, your work directly impacts real people: helping barbers, estheticians, nail techs, and stylists thrive in their craft.

Right now we're hiring for:

Mid-Level Engineer (Python/JS) - Remote (UK/Poland/Spain) Senior Python Engineer - Remote (UK/Poland/Spain) Staff Engineer - Remote (UK/Poland/Spain)

If interested please reach out to Email is hidden

Adyen | Founding Research Engineer, AI | ONSITE (San Francisco) | Full-time

Adyen is a global fintech platform powering payments, data, and financial services for companies like Meta, Uber, Spotify, and Nike. We’re profitable, publicly traded (AMS: ADYEN), and currently building a new AI research hub in San Francisco.

We’re hiring a Founding Research Engineer (AI) to help launch this team. You'll work directly with our SVP of Engineering and be the first AI research hire in SF, helping define our strategy and ship applied AI systems—focused on areas like foundational models, agentic workflows around identity and risk.

This is a hands-on role for someone with deep technical skill, strong product intuition, and a drive to build.

More info: https://careers.adyen.com/vacancies/6685352-founding-researc...

Questions? Reach out: Email is hidden

Pave | https://www.pavefi.com | Data Scientist | Backend Engineer | Remote (US or Canada) | Full-time

I’m the Director of Engineering at Pave, a rapidly growing startup revolutionizing financial access for underserved consumers and small businesses through AI-powered Cashflow Analytics and Scores.

50+ risk teams use Pave to reduce defaults, provide the optimal loan amount/credit limit, and maximize collections success.

- We’re hiring a Backend Engineer to scale our data processing platform to 100M+ users: https://wellfound.com/l/2bmppa

- We’re hiring a Data Scientist to ship models that will redefine the US credit system, making it fair and inclusive: https://wellfound.com/l/2aqff9

Shoot us an email at Email is hidden and let us know you found us on HN!

Pave is backed by Better Tomorrow, Bessemer, 8VC, and other top funds and angels from Coinbase, Chime, SoFi, CashApp, and Plaid.

Title: Full-Stack Engineer | Contract | Remote (US-based)

Company: Audio-First Test Prep Platform

Duration: ~10–12 weeks for MVP

Compensation: Paid contract – competitive rate (no equity)

Experience Level: Mid to Senior preferred (3 years +)

Funding: Final stages of mobilizing resources to begin the MVP build. The project timeline reflects this progression.

We’re building an adaptive, audio-driven test prep platform designed for nurses, pre-med students, law students, and other high-intensity learners balancing work, family, and study. Think voice-based Duolingo meets real-time spaced repetition.

We’ve already built the front-end and now need a self-directed, back-end/full-stack engineer to help us finish the MVP by late summer, early fall.

Ideal Stack (flexible):

* Node.js / Python / Firebase / Postgres / Supabase

* Open to suggestions if justified and lightweight

You might be a fit if:

* You’ve built and launched real tools or platforms before (not just internal dashboards)

* You like fast execution but also appreciate mission-driven projects

* You value clarity, minimal meetings, and aligned momentum

* You have the capacity for solo execution but are open to scaling

* We’re not offering equity or co-founder status. This is paid contract work with possibility for long-term relationship once MVP proves value.

More info + how to apply: (https://hail-peridot-e09.notion.site/hiring-full-stack-softw...)

*This is a time-sensitive build that requires steady focus. Please only apply if you're able to be fully present during this phase.*

Spellbrush | Tokyo, JP or San Francisco, CA | Full-Time | Onsite We build AI models to make anime real.

- Game Dev: looking for engineers who know unity, love the anime aesthetic, and want to work on our upcoming strategy RPG.

- Full Stack Software Engineer: looking for smart generalists who love anime and want to work on advanced data processing pipelines for petabytes of anime images & video.

- Audio/LLM Researcher: looking for senior researchers interested in working on foundational end-to-end audio models. Must tolerate^Wlove high-pitched moe anime voices.

Ping over name of best waifu or husband to Email is hidden. Can sponsor visas to either USA or JP.

See all roles over at https://spellbrush.com/careers

Veritus Agent | Founding AI Engineer | San Francisco (Onsite) | Full-time https://veritusagent.ai

Veritus Agent is building fully compliant AI agents for regulated industries—starting with financial services. We’re applying voice and language models to deeply human problems, with real-time agent orchestration, adaptive workflows, and strict compliance guardrails built in from day one.

We’re an early-stage startup led by a repeat founder (prev: $15M ARR SaaS exit) and moving fast. Our first use case is collections—but the infrastructure we’re building has much broader applications in servicing, fintech, and beyond.

We’re hiring a founding full-stack AI engineer to:

• Build multi-channel AI agents (voice + messaging) on top of LLMs and voice AI

• Develop guardrails, compliance filters, and eval systems

• Help shape our internal orchestration + CRM platform

• Integrate with real-world systems like payments and loan management APIs

You should be:

• An AI-native builder with deep experience using APIs like OpenAI, Claude, Whisper, etc.

• Comfortable working autonomously and quickly in high-ambiguity, zero-to-one environments

• Excited about joining a small team with a high-performance culture

• Bonus: Background in enterprise software or fintech

We’re based in SF and the roll will be onsite or hybrid.

Email me directly: Email is hidden

Concourse (NYC, Onsite) — Founding AI-Native Engineer — Full-time We’re building Concourse: a VC-backed startup creating a marketplace for governments to discover and purchase tech solutions. We’re hiring a founding engineer to work onsite with our small team in Flatiron, NYC. Must be experienced building with AI tools such as Cursor, Claude, etc. Stack: Python, Next.js, Tailwind FastAPI No visa sponsorship available. Apply: https://wellfound.com/l/2bn3p4 DM me or email Email is hidden for more.

Jane Street | Hybrid | Full-time

If you haven't heard of us before, we’re a quantitative trading firm that cares a lot about technology. This means building elegant solutions that scale well, never assuming that “best in market” is the same as “best possible,” and ensuring everybody has the resources needed to do their jobs well.

We're looking for folks in New York, London, Hong Kong, and Singapore for a variety of roles including, but not limited to:

- Data Engineers who can help us understand, clean, manage and share the data that guides our trading. At Jane Street, having a thorough and accurate understanding of data is at the core of everything we do -- https://www.janestreet.com/join-jane-street/position/6558007...

- Network Engineers to help our Network Security team run, scale, and continuously improve our infrastructure through hands-on operations, testing, and automation -- https://www.janestreet.com/join-jane-street/position/6230456...

- Machine Learning Engineers with robust experience in machine learning and strong mathematical foundations. Machine learning is a critical pillar of Jane Street's global business. Our ever-evolving trading environment serves as a unique, rapid-feedback platform for ML experimentation, allowing us to incorporate new ideas with relatively little friction -- https://www.janestreet.com/join-jane-street/position/6485460...

- Machine Learning Performance Engineers with experience in low-level systems programming to help optimize the performance of our models - both training and inference -- https://www.janestreet.com/join-jane-street/position/7449077...

- Software Engineers who are intimately tied into every area of our business. We are big believers in functional programming, using OCaml, a statically-typed functional programming language, as our primary development language. We also believe in the value of open source software, using it in our daily work and releasing hundreds of thousands of lines of our own code as open source -- https://www.janestreet.com/join-jane-street/position/4274288...

- Frontend Software Engineers who are passionate about user-interface design and typed functional programming. You would take part in the design and implementation of our next-generation of browser-based tools for operating our trading infrastructure -- https://www.janestreet.com/join-jane-street/position/6184529...

- Production Engineers who spend time both developing software and providing high-quality support for software systems that are critical to our trading business -- https://www.janestreet.com/join-jane-street/position/5108180...

ApplianSys | Senior Software Developer | Coventry, UK | Onsite | 40,000 - 70,000 GBP / year | Full-Time

Tech used: GitHub, Linux, Network, Nginx, Python, Embedded, Hardware, HTTP

We seek individuals eager to elevate their careers. Our standards are high, and the work is intellectually challenging. These positions offer the opportunity to make a personal impact, develop your skills, and achieve substantial professional and financial rewards.

More details and option to apply: https://devitjobs.uk/jobs/appliansys-senior-software-develop...

Obsidian Security | Threat Backend Engineer | Newport Beach, Palo Alto, Philadelphia | Onsite or Remote | Full-Time

Obsidian Security is at the forefront of SaaS security, dedicated to detecting and mitigating threats effectively. We are hiring for multiple roles. With our advanced threat detection solution, we visualize user activity, identify employee compromise, and mitigate insider threats, ensuring data security before a material breach occurs.

Skills:

- Python (specifically experience with asyncio) - Rust a plus - SqlAlchemy - Fastapi - Scylla DB a plus - Go Apply here: https://grnh.se/a646066d8us