Ask HN: Who is hiring? (April 2025)

Altar.io | Remote in Portugal (Europe) - must live here or open to relocate | Mid + Senior Backend and fullstack | Fulltime | https://altar.io

Hi, Pedro, lead recruiter from Altar.io here. We're a software house that wants its clients (early-stage startups, entrepreneurs) to thrive. We came together from various backgrounds with one vision: to bring a lean, user-centric approach to product innovation and software development by completely understanding the business needs before building anything.

Stack - node/express, angular/react, MongoDB/PostgreSQL. ~50 strong total team, ~20 devs.

Fully remote but must be Portugal-based. (Office in Lisbon, visits are fully voluntary).

All roles at careers.altar.io Comprehensive FAQ at careers.altar.io/#faq

Redfin | Software Developer II / Staff Engineer / Sr Engineer / Sr Data Analyst / Sr Machine Learning Engineer / Android Engineer | Hybrid Seattle or Atlanta

Redfin is revolutionizing the $75 billion real estate industry. We use data, beautiful software, and innovative design to put customers first at every step in the home-buying and selling process. Get ready to dive headfirst into our award-winning website, mobile apps and data platforms, solving complex business problems in a highly visible, customer-centric way. If you value doing great work in a collaborative environment, join our team.

The Rentals Team is hiring an SDEII, responsible for building features that empower a user’s rental search journey. Our team develops the Rental Details Page and the Search map, two of the highest traffic page types for Redfin.com. Our full-stack team builds highly visible consumer facing UI as well as robust data ingestion pipelines and data services. By joining our team, you’ll have a chance to work on features that get seen by millions of users and work on multiple critical platforms and services.

Primary tech stack: React, Java, Postgres

Apply here: https://careers.redfin.com/us/en/job/56888/Software-Develope...

Other roles here: https://careers.redfin.com/us/en/search-results?s=1

Loop | loop.com | Engineering | On-site San Francisco, CA, Chicago, IL

Loop is on a mission to unlock profits trapped in the supply chain (https://www.loop.com/article/unlock-profit-trapped-in-your-s...) and lower costs for consumers. Bad data and inefficient workflows create friction that limits working capital and raises costs for every supply chain stakeholder.

Loop’s modern transportation cost management platform uses our domain-driven AI to harness the complexity of supply chain data and documentation. We improve transportation spend visibility so companies can control their costs and power profit. That is why industry leaders like J.P. Morgan Chase, ABB, Estee Lauder, Olipop, Dot Foods, Tyson Foods, Great Dane, Emerge, and Loadsmart, work with Loop.

WSJ piece on Loop - on.wsj.com/3PE357W

1. Raised $100m+ from JPM GEP, Founders Fund, 8VC, Susa Ventures, Flexport, Index, and Expa.

2. 45+ paying enterprise customers with multiple-year contracts; 70+ customers in the pipeline.

3. High-caliber team of engineers and operators from Google, Scale AI, Flexport, Uber, Rakuten, Square, Meta, Stanford, Brown, Princeton, and Yale.

4. 7+ years cash runway

Fullstack Engineer San Francisco - https://job-boards.greenhouse.io/loop/jobs/4102236004

AI Engineer San Francisco - https://job-boards.greenhouse.io/loop/jobs/5391540004

Other roles at https://www.loop.com/company/careers

Toontown: Corporate Clash | Volunteer/unpaid position | Remote only (worldwide) | All experience level welcome

We are Toontown: Corporate Clash, an entirely not-for-profit MMORPG that is a fan reimagination of Disney's defunct MMORPG, Toontown Online. Besides continuing the legacy of Toontown Online and bringing the MMO into the 21st Century, we also use our original IP to [raise funds for charities](https://corporateclash.net/news/article/155) - we have raised over $54K for children's health and LGBTQ+ charities.

We are on the lookout for a broad range of talents, from Tech to Art to Community Management! Everybody on the team is a volunteer - there is no salary, we do not solicit donations and all expenses are funded by our staff. We pride ourselves as being a training ground for up-and-coming talent to gain experience working on a real product in a 100+ strong team; some of our volunteers have used their experience with us to land jobs in and out of the industry.

We have lots of interesting tech problems that arises from building on top of a 20+ year old codebase (yes, Toontown development started out on Python 2.0!). We are especially interested in people with an interest in distributed systems, system administration, game physics and automation pipelines!

Our Tech Stack is varied: Python for the game, C++ for distributed networking services, JavaScript / TypeScript and some PHP for web. We're working on modernizing our tech stack to migrate away from PHP, and looking to introduce Rust (for Tauri / core networking) into our stack.

You can see all of our positions and how to apply here (when emailing us, feel free to say HN): https://corporateclash.net/help/apply

How much you want to contribute is up to you; our volunteers typically contribute 5-10 hours a week.

NOTE: You can ignore the 3-month in-game activity requirement, it's being revised soon!

Layer Health | https://www.layerhealth.com/ BOSTON or NYC (HYBRID in either office 2-3 days/week)

Heavily focused on hiring sr/staff/principal backend, data infra, or MLE's at this time

Profiles of our team members: https://www.linkedin.com/company/layerhealth/people/

Recent article on our Series A round raise: https://www.mobihealthnews.com/news/layer-health-garners-21m...

Layer Health is an AI/ML startup (fresh Series A) leveraging LLM’s to transform how clinical data is understood and used. We’re tackling a huge inefficiency in healthcare—patient chart abstraction, a $2B/year problem. Today, nurses handle it manually, drowning in notes and reports instead of focusing on patient care. Chart abstraction represents the largest source of labeled data in healthcare; an ML/researcher’s dream for answering complex clinical questions (which his why much of our team has a deeply focused research/ML background).

Work Locations: Boston /Back Bay (beautiful office overlooking Boston Common) or NYC (Grand Central area). No remote work

Headcount: ~18; likely 40-50 by end of year

Stack: mostly React + Typescript Frontend / Python Backend // GCP (though we are not hiring frontend at this time)

Open Roles: Sr/Staff/Principal Backend/MLE/Data Architecture/Infra (1-2 roles each)* ML Research Engineering * Research Scientist (PhD's) * Head of Product * Product Designer

Email at mike-c@layerhealth.com for more info

Cathmere | Sr Engineer | Hybrid NYC | Full Time | https://cathmere.com We are are a seed-stage startup revolutionizing how capital flows to emerging markets through our innovative fintech platform. We're seeking an exceptional Senior Engineer to help build our end-to-end solution that connects US investors with high-impact equipment financing opportunities in emerging markets. Our challenge is to build a scalable platform that captures real-world asset performance via multiple streams of operational and financial data in a decentralized network of business counterparties. Responsibilities

- Build and maintain a decentralized processing system that can handle a high throughput and complex counterparty relationships

- Creating data models that support complex financial analytics

- Implementing data quality monitoring and validation systems

- Developing APIs for real-time data access and analytics from decentralized ledge

Must Have

- 5+ years of experience building complex distributed or decentralized systems and strong communication skills

If you’re interested in learning more, email matt@cathmere.com

Ovyl | https://ovyl.io | On Site Nashville, TN (in office 2-3 days/week)

We are a growing hardware product development company based in Nashville. We develop products holistically - we have User Researchers, Industrial Designers, Mechanical Engineers, Electrical / Hardware Engineers, and Firmware Engineers. The types of products we work on range from commercial IoT, medical devices, and consumer electronics.

Open positions https://ovyl.io/studio#jobs:

  -  Lead Project Manager
  -  Senior Mechanical Engineer (will go live this week)

Ideogram | ONSITE(NYC or Toronto)| Full-time | ML, Backend, Frontend and Product Design roles

For more details, take a look here: https://www.ideogram.ai/careers?utm_source=hacker-news

Ideogram’s mission is to help people become more creative. Our thesis is that everyone has an innate desire to create. We are developing state-of-the-art AI tools that will make creative expression more accessible and efficient. We are pushing the limits of what’s possible with AI, with a focus on creativity and a high standard for trust and safety. Our headquarters is in downtown Toronto, and we have a small presence in NYC. Read our Ideogram 3.0 (https://about.ideogram.ai/3.0) and Canvas (https://about.ideogram.ai/canvas) blog posts, and try our product at ideogram.ai to get a glimpse of what we're building.

Our founding team consists of world-renowned AI experts including Mohammad Norouzi, Jonathan Ho, William Chan, and Chitwan Saharia. This team has previously led transformative AI projects at Google Brain, UC Berkeley, CMU, and the University of Toronto. Our fundamental work in AI includes: Imagen: Google’s text-to-image system, Imagen Video for video synthesis, Denoising Diffusion Models, which is the foundation of the recent generative media transformation.

Flexhire.com | Full time | Full Remote (EU, Americas, Eastern Europe)

Flexhire is a modern 3-in-1 HR platform, ATS and talent network that helps our clients scale their businesses faster, leveraging cutting edge AI and science-based hiring best-practices. Our clients include Fortune 500 companies and venture backed startups. We allow them to focus on what they do best while we help them seamlessly find, employ, manage and pay the best talent anywhere in the world.

We are hiring Senior Full Stack Engineers, a Product Owner and a SDR

Stack: Next.js, React, MUI, Ruby on Rails, GraphQL, Postgres

https://flexhire.com/careers

More Optimal | R&D engineer | The Netherlands (Den Bosch) | HYBRID (min. 3 days in-office)

More Optimal provides a low-code environment specifically aimed at Operations Researchers who use our platform to solve the most difficult planning and optimization challenges in the world. For our R&D department we are looking for an R&D engineer who is enthusiastic about working on a complex system, solving puzzles and loves complex programming challenges, to make More Optimal even more loved by our customers as well as implementation partners.

In our R&D team you will be able to work on a very diverse combination of problems depending on your preferences: frontend, backend, advanced algorithms and infrastructure. We are a fast-growing company where you can make a real impact quickly.

Tech stack: TS/JS (primarily), Java/Kotlin, Python, Go, GCP

Feel free to contact me directly (timo@moreoptimal.com) if you have any questions about the job opening.

TensorZero | https://github.com/tensorzero/tensorzero | Founding Member of Technical Staff | NYC (onsite) | Full-time

TensorZero creates a feedback loop for optimizing LLM applications — turning production data into smarter, faster, and cheaper models.

We're looking for a Founding Member of Technical Staff with any of the following skillsets:

‣ Back-end / Systems Engineering (Rust)

‣ Front-end / Design Engineering (React)

‣ ML Engineering / Research (Python)

What we offer:

‣ Vast majority of your work → open source

‣ Years of runway

‣ Small and entirely technical team: former Rust compiler maintainer, ML researchers with 1000's of citations, decacorn CPO

‣ $200-250k base + up to 1% equity + benefits

‣ Onsite (5 days) in NYC

More information: https://tensorzero.com/candidate-brief

Apply: https://www.tensorzero.com/jobs