ThreatMark | Security, Machine Learning | REMOTE(World) / Brno, Czech Republic | Equity

ThreatMark protects >50M end users from finacial fraud and saves > $100M every year in losses. We are working with top banks in EU and US to protect their end users. We develop large-behavioral models that recognizes returning users by their mouse movements, keystroke timings and sensoric data (accelerometer, gyroscope). We detect cyberthreats (e.g. malware, phishing, scraping) by exploiting browsers/sandboxes of devices. We manage ~PB scale of data and provide realtime scoring in milliseconds driving authentication/authorization flow (2nd factor).

Stack: [python, typescript, rust], [redis, postgresql], [aws, terraform] ...

We are looking for exceptional engineers to join our team and be part of the success:

- Principal Software Engineer (experience with petascale, distributed systems, low tail latencies)

- Senior Data Engineer (datalake, ETL pipelines, pyspark...) ...

If you are interested, please email us @ Email is hidden with subject "HN Who's Hiring"

If you don't find the right role at https://www.threatmark.com/careers/, write us anyway if you believe you can be good fit :)

Krystof Hilar, Co-Founder & CTO

Anterior | On-site NYC | Full Time | https://anterior.com | Senior or above

Anterior is improving the experience of healthcare for everyone. We're working on the cutting edge of using technology to make clinical decisioning frictionless, starting with prior authorization.

About You: You have a passion for doing things The Right Way, you believe Less is More, you want to focus on Foundations of system design and architecture (pacelc, consistency guarantees), you care as much about what code you do not write, you’re tired of the hype treadmill and care about the fundamentals. You have battle scars from overengineered and underperforming slop, and you care about writing code that lasts.

- Langs: Python / Go / TS, React (and HTMX if you can help!)

- Infra: Nix, CDKTF, AWS

We’re hiring from infra to frontend, there is room all the way up and down the stack. Come share your proudest firefighting story with us in an interview, bring your GitHub, and let’s see if we’re a good fit!

Email is hidden

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FetchFox.ai | https://fetchfox.ai | REMOTE (US) | competitive compensation

FetchFox is an AI web scraper. It convert takes a prompt and a URL, and crawls that site to give structured data.

[edited to remove listing, as we are working through existing applicants at this time]

1. Up to $200k + Up to 1% equity. REMOTE.

We are hiring our first full-time engineer to work alongside our Technical Co-founder!

This is your opportunity to join a company in its earliest stages and win. Orderediting.com is 12 months old, bootstrapped, and doing $850K ARR, profitably!

2. About us:

Order Editing is the first Shopify app that lets customers make changes to their online orders after purchase, instead of contact customer service. We save brands hundreds of thousands of dollars in labour costs and drive incremental revenue by creatively upselling items after purchase "There's space in your package for X".

3. Our Prcincipal Software Engineer is responsible for:

Ideating, pitching, and building roadmap ideas that solve mega probles for the top 10% of brands on Shopify. How can you change the quality of life for a brand like Oh Polly?

Developing with attention to detail and rigor that transforms the look, feel, and speed of a Shopify app that has had to scale at the speed of light.

Innovating and tinkering with speed on the creative, startuppy, problem solving ideas that led us to build such an impactful app in the first place - build what is next.

Communicating with technical and non-technical people, whether it's the internal team, our customers, or partners - we'll shield you from 'noise' so that you can grind, but we aren't behind closed doors.

Challenging the founders to influence business strategy and shape the future of a product.

4. CTA: Email Email is hidden with your application. Subject line "{{NAME}} Principal Engineer".

mymcat.ai | data-driven software engineer for medical education startup (remote)| remote | https://mymcat.ai

MyMCAT.ai is a machine learning educational technology company that seeks to build a better class of doctors. We’ve built a unique, gamified intelligent tutoring system, essentially a video game for learning the MCAT. Our platform is an intelligent tutoring system which diagnoses student weaknesses, assigns them content and videos in fun games, and then uses AI to tutor them on topics they struggle with.

However, what we REALLY need is a software engineer who's good with data.

It's built like a sensor network: from the beginning to the end, every interaction with our website is tracked and used to update the model's understanding of student knowledge. Every interaction on our platform is a data point – highlights, answer changes, even the coins they earn. This gives us unprecedented insight into how top performers master complex material. We're capturing the real-time cognitive processes of the highest achievers, not just their scores. We are leveraging insights from behavioral economics to optimize learning through a proprietary coin system – what students prioritize, and how they respond to incentives. For example, we learned that higher-performing students on MCAT CARs reading passages actually highlight less rather than more, turning theory of excellent test-taking into data-driven insights.

Please apply by sending a resume and a creative work — basically anything unrelated to work where you had to exercise creativity (art, creative writing, music) — to Email is hidden.

WE NEED PEOPLE WHO ARE REALLY GOOD AT DATA AND GOOD-ISH AT SOFTWARE DESIGN

GoGoGrandparent (YC S16) | FULLY REMOTE | Full-time | US, UK, or able to work 4+ hours overlap with mainland US | 3 x Senior/Staff Backend/Full-stack Engineers | $90k-$150k

Build high-quality, robust engineering at the rarest of things - a Silicon Valley startup that is both wholesome AND profitable. We have 8-figure revenue, are YC-backed, and growing fast.

Tech stack (required): Back-end (Node, Typescript, MySQL, REST* / GraphQL), Front-end (Vue.js), deploy (AWS, Docker/K8s)

Minimum 5 years experience (with Node or Vue).

2-stage interview process.

If you want to help older adults and people with disabilities, send your LinkedIn/CV to Email is hidden (keep it brief) or apply at https://www.ycombinator.com/companies/gogograndparent/jobs

Volcore | Manchester, UK | ONSITE | Full-Time | Software Engineer

At Volcore, we model the electricity system to do proprietary trading that helps balance the grid and facilitate renewables integration. Our technical roles are a blend of Software Engineering and Data Science, wherein we solve problems end-to-end, from data ingestion and analysis to optimisation and deployment. Often these require novel solutions, drawing on original research and experimentation. We are a profitable and ambitious startup looking for Software Engineers who can both crack these kinds of problems and continually improve our shared libraries, tooling and workflows to ensure they are fast, accurate and a delight to work with.

Our team are close-knit, with minimal hierarchy and almost zero meetings. We work together in-office to whiteboard solutions together and everything we build is used by people sitting next to us.

Typically these positions attract people who have outgrown their previous role and are seeking more responsibility or more challenging subject matter. Every team member owns important projects very early on, and if you can deliver value in a particular area, you’ll be recognised and rewarded for it, regardless of job title.

Our tech stack includes Python, backend Typescript, Postgres and, increasingly, Rust, although the latter is not a Day-1 requirement.

We review all applications personally. For more info, including our requirements and salaries:

- Experienced Software Engineer: https://www.volcore.co.uk/experienced-software-engineer

- Junior Software Engineer: https://www.volcore.co.uk/junior-software-engineer

tem. | https://www.tem.energy/ | Remote (UK & EU) | Full-time

Here at tem. we are revolutionising how energy is transacted leading to a world where everyone is able to bypass big energy and buy renewable energy direct (RED).

After raising our Series A, in April, we are expanding our team as we scale to take on the broken energy industry.

Quantitative Data Scientist (£65k-£90k) https://app.welcometothejungle.com/jobs/ee-hw2dm

We are looking for a data scientist to help work on one of the core problems we face with RED, risk & pricing. You’ll design and deploy advanced models that drive real-time pricing decisions, shape portfolio risk, and power our energy platform end-to-end.

Data Analyst (£45k-£60k) https://app.welcometothejungle.com/jobs/uaglnjx1

We are looking for a product minded data analyst to come and join our rockstar analytics engineer to take our BI to the next level. You’ll interact with all departments across the business, bringing data to the forefront of all decision making at tem.

Full Stack Engineer x 2 (£60k-£70k) https://app.welcometothejungle.com/jobs/3u28r1j6

We're seeking a Full Stack Engineer with 2-3 years' experience in Python, front-end development, AWS Cloud and databases like PostgreSQL or DynamoDB. You'll collaborate with cross-functional teams to optimise and extend our platform, develop scalable microservices, and contribute to engineering discussions. Startup experience, problem-solving ability, and familiarity with React.js are a plus.

We are also looking for a Social Media Producer (£35k-£45k) https://app.welcometothejungle.com/jobs/y9nsotaj

Leading Global Financial Firm | AI Product Engineer & Innovation Researcher | Kraków, Poland | Hybrid (3 days onsite)

We're building something new: a dedicated AI innovation lab in the heart of Kraków's tech hub. Our mission? To solve the thorniest challenges in modern finance through cutting-edge technologies.

This isn't just another tech role—you'll be a founding member of our local innovation studio, with the autonomy to shape our direction and the backing of a global financial leader.

We have two open positions:

1) AI Product Engineer: You will architect and prototype AI solutions that could reshape our industry. You will work directly with subject-matter experts, analysts, and other engineers to identify opportunities and bring solutions to life.

2) Innovation Researcher: You're part strategist, part investigator, and part future-thinker. Using service design and design thinking methods, you'll identify unexplored opportunities in financial services. You'll build business cases that balance innovation with viability, supported by deep market analysis and financial modeling.

What we're looking for:

- Innovators who can see beyond current fintech trends

- Problem-solvers who thrive in ambiguity

- Collaborators who can bridge the gap between technology and business

- Experience with AI/ML technologies and their practical applications

If you are interested, email victoria dot pillari at leveluphcs dot com, and include: Your resume or LinkedIn page and examples of your work (portfolio, case studies, OSS contributions).

Location & Requirements:

- Position based in Kraków, Poland

- Must have EU work authorization

- Hybrid schedule: 3 days onsite, 2 days remote