Radar Labs | Software Engineers (SRE, data platform, backend, full-stack, mobile) | Remote (US), NYC | Full Time | https://radar.com

- Radar is the geo-location dev tool

- Doing 1B+ API calls per day

- Our main languages are Rust and TypeScript, we also use mobile and offline pipeline languages (Python, Scala, and Terraform).

- We're based in NYC with our HQ in Union Square and remote friendly (US)

Interesting things we're working on:

- HorizonDB, our Geospatial database written in Rust

- Precise indoor location more accurate than iOS and Android leveraging Ultra-Wideband, other mobile sensors and ML.

- Extracting raw map data from satellite maps and the web leveraging ML and AI

- Anomaly detection to identify spoofed locations

- Mobile infrastructure that automatically configures itself optimizing battery-life and location accuracy for different use-cases over time

- Multi-Region AWS K8s deployment, 99.99%+ availability

- Frontend tools to visualize and debug location data at scale

Check out our jobs page here: https://radar.com/jobs#jobs If you have any questions, feel free to reply here or you can e-mail me at Email is hidden

Sesame | Full-time | SF/NYC/Bellevue | On-site | https://www.sesame.com/

Sesame believes in a future where computers are lifelike - with the ability to see, hear, and collaborate with us in ways that feel natural and human. With this vision, we're designing a new kind of computer, focused on making voice personal agents part of our daily lives.

Our team brings together founders from Oculus and Ubiquity6, alongside proven leaders from Meta, Google, and Apple, with deep expertise spanning hardware and software. Read more from Sequoia: https://sequoiacap.com/article/partnering-with-sesame-a-new-...

Open Roles:

- ML Engineers

- ML Scientists

- Product Designers

- Product Engineers

- iOS Engineers

- ML Model Serving Engineer

- Embedded OS Architect

- Mechanical Engineer, Product Design

- Embedded Engineers

- Electrical Engineer

- Audio Systems Engineer

https://jobs.ashbyhq.com/sesame

Triumph Financial | https://triumph.io | Engineer (Senior | Lead | Staff) | REMOTE (USA only) | Full Time | $150-$300k

At Triumph Financial, we’re building the modern freight payments network powering over $37B in annual volume. Our mission is to make freight transactions seamless, accurate, and secure, helping an entire industry move faster.

We’re hiring across multiple levels in Engineering. Our teams are small (3–5 engineers), autonomous, and rotate quarterly to stay fresh and cross-functional.

Tech we use: We’re language agnostic and hire for fundamentals. Our teams work across a mix of:

* Ruby on Rails / Elm

* Java / React

* C# / React

If you’re a strong engineer who loves solving complex problems, mentoring others, and building real-world systems that move money at scale, we’d love to talk. We’re looking for people who are:

* Curious and collaborative

* Obsessed with product quality and user experience

* Excited to work on distributed systems and modern financial infrastructure

Roles are here: https://triumph.io/about-us/careers/

Please put “Ash HN” or something similar in the referrals so we can bubble you up.

If you have questions, feel free to reach out directly at aanderson at tfin dot com.

Olli Health | Remote (US/CA) w/ Annual Travel | Full-Time | Senior ML/NLP Data Engineer | ollihealth.ai

We are a TechStars NYC ‘24 startup dedicated to modernizing home healthcare with advanced AI tools and we are expanding our team again! These are pivotal hands-on roles that will begin shaping our product from day 1. We are backed by top healthtech and AI-focused VCs investors (Cannage Capital, Arkitekt Ventures, and Tau Ventures) and have been moving lightning fast to build incredibly valuable tools in home health.

We are looking for:

- Proven success in the fast-paced 0 to 1 early days of young startups (experience on founding team or pre-seed ideally). Work will be optimized based on your preferred balance, and what gives you energy.

- Experience (5 years+) with most of our stack: AWS, PostgreSQL, Python (FastAPI), Pytorch. Role involves devops, data engineering, evals & benchmarking, workflow optimization, etc.

- Able to demonstrate hands-on-keyboard coding chops. Roles are primarily IC + collaboration with our team, and room to grow into startup leadership.

- Comfort interacting with ML/NLP and LLM-native data engineering problems

- PhD-level ML + proven expertise training, and deploying models for production use

- Experience working with healthcare data (not required but highly valued)

Comp: $200k-$250k annual FTE base comp + equity package. We cover 100% of Health, Vision, Dental, Life insurance premiums.

I’m Olli’s CTO and these positions will work directly with me and our core (currently 7-person) engineering team. hiring+hn [] ollihomehealth [] ai - Email me with questions, for a full JD, or to send your CV. No staffing or recruiting firms, please, individuals only.

Duranta | Full-Time | Staff backend engineers | Location: Seattle, WA or NYC | On-site

Company: we're a small startup (pre Series A) building a business-in-a-box solution for landscaping companies, initially targeting the US. It's a huge market with more than 700000 companies in the US alone but with very little good software. We're looking for a very experienced backend engineer (senior/staff level) capable of taking ownership and leading the development of entire systems.

We keep our infrastructure as simple as possible, so the entire backend is in Golang with Postgres+S3 as the data storage layer. And a bit of Terraform for the infrastructure.

We're NOT a standard "AI startup" doing LLM wrappers, but we do have our own computer vision AI that we use to produce models from satellite imagery. So if you're interested in working on unusual AI pipelines, we have plenty of work there too.

Our frontend is a React.Native app, and we're working towards having full feature-parity inside a regular webapp.

Experience:

* Go backend experience

* A lot of experience with distributed systems

* Designing robust APIs (we're using ConnectRPC)

* Ideally experience with offline apps and database synchronization

* The usual: infrastructure-as-code, Docker, Github actions, OpenTelemetry, etc.

Salary: $170-$210k and equity

Apply: https://jobs.lever.co/getduranta/50af551a-9a5c-498c-9729-6f2...

Company page: https://getduranta.com/

Float Technologies | Backend and AI Engineers | Full-Time | ONSITE | New York, New York | $120k-225k

https://www.float.tech/careers

At Float, we're building capital markets infrastructure. Our AI-native platform is tackling decades-old inefficiencies, creating technology that enables financial institutions to interact seamlessly and automate intelligently. Based in SoHo, New York and backed by top-tier venture investors, we're a team of engineers, designers, product managers, quants, and market experts shipping elegant solutions to complex problems. We move fast, care deeply about building things right, and work directly with our users to deliver products that transform how markets operate.

If interested, apply here https://float-tech.notion.site/140ab6ef153b800a97e0d68ee5444...

pod network | Competitive salary + equity | Remote | Multiple roles

We’re an early stage blockchain startup building the next generation of decentralized financial infrastructure. Our novel architecture provides more than 10x better performance than competitors while completely avoiding any centralized party (or leader) having an edge over other participants, eradicating MEV issues, and enabling fairer markets.

Backed by a16z crypto and 1kx.

Hiring: Backend Engineer (with trading systems experience), Business Development Lead, Content & Growth Strategist

Apply here: https://jobs.ashbyhq.com/pod-network?utm_source=oqa8z7ojl3

In addition to the search tools mentioned above, feel free to use https://nthesis.ai/public/hn-who-is-hiring. It has search (text / semantic), chat and extracts data from alternate viewpoints (e.g. business / role) and allows you to visualize a semantic map of those things. I hope it helps!

Atlassian | https://www.atlassian.com/software/rovo | REMOTE | Full-time | Machine Learning Engineers

Atlassian's flagship AI product - Rovo Chat is going through a hockey stick growth moment, and we are looking for machine learning engineer passionate about building machine learning systems that operate at XX million user scale

We are pushing the boundaries on:

- Agent Orchestration

- Evals and benchmarks

- Model Training (SFT + RL)

Apply here: https://www.atlassian.com/company/careers/details/22898

Ionworks | Founding Systems Engineer | Remote (US) or Pittsburgh, PA | Full-time

Ionworks builds battery simulation and optimization software used by R&D teams designing next-generation batteries. We are looking for a founding backend / systems engineer to own big pieces of our backend and help us scale from a few early customers to broader industry use.

Work: - FastAPI, async Python, Supabase/Postgres - Designing APIs and data models for simulation and optimization workflows - Performance and reliability work across the stack (queries, async, concurrency, resource limits) - Job orchestration for running and tracking simulations - Observability: logging, metrics, tracing, debugging real issues

We are especially interested in people who work in a "vibe engineering" style: using LLMs and coding agents as accelerators, but still planning ahead, writing tests, supervising agents, and staying fully responsible for code quality and architecture. If you already use AI tools this way in your day-to-day work, you will fit in well here.

Stack: FastAPI, Python, Supabase/Postgres, distributed compute for simulations, AI-assisted dev.

Benefits: competitive salary, meaningful equity, remote-first, unlimited PTO, 401k match, medical/dental/vision, paid parental leave, home office budget.

If this sounds interesting, send a short note to Email is hidden with "HN backend" in the subject and fill in the application here: https://apply.workable.com/ionworks/j/a8c2f4287c/