- 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 tim@radar.com
We are hiring two Developer positions: - Senior Software Engineer: Network layer communication optimizations - Senior Software Engineer: GPU porting / RDMA / NCCL / NIXL layer development
We are a deep-tech company building the next generation network communication layer for AI, squeezing out GPU idle time during LLM training with accelerated RDMA communication across clusters. If you love deep systems work and high-performance networking, you will fit right in.
We also service many other networking related industries like mobility, satellite, aerospace, atmospheric optical, VPN, SD-WAN and defense.
- What you’ll do - Design and implement high-throughput, low-latency transport and flow-control logic (think TCP/QUIC/UDP, congestion control, pacing) but next level. Optimize end-to-end performance (CPU/GPU/IO), and ship results that move real workloads.
- What you bring - Proficient in C, C++, Rust Strong grasp of networking transport protocols & flow control concepts. Solid math foundation. You understand memory management, concurrency, throughput and efficiency at scale.
- Nice to have - Mobile (Android/iOS) development knowledge. GPU porting experience. NCCL / NIXL / DPDK integration experience. RDMA/RoCEv2/Infiniband/NVLink knowledge . FEC/erasure coding knowledge.
Interested? Send your resume to: work@bitripple.com You will be talking directly with: Mike Luby, CTO: https://www.linkedin.com/in/michaelluby/ or myself Scott Brown, CEO: https://www.linkedin.com/in/scott-k-brown/
Hi all, I’m Yuriy, founder of Puma.tech. Previously worked as software engineer & developer advocate at Cloudant (YC S08, Acq. by IBM), Meteor (YC S11), Parse (YC S11, Facebook/Meta), and explored AI/ML (computer vision for self-driving cars).
We have two products:
1. Puma Browser (iOS & Android) – browser with built in LLMs & Wallets. Private by design.
2. PumaAI app for Mac – ChatGPT/Atlas, but with ability to pick different model providers and fall-back to local-first ones for data privacy.
Open Roles: Eng (iOS/MacOS, Android, Ai/ML, Browser Extensions), Based Social Media Intern; Internships: Eng, Design, Growth
We’ve raised a few rounds from some of the best builders in crypto and ai:
Protocol Labs (YC S14), Chris Larsen (Ripple), Anatoly Yakovenko (Solana), Illia Polosukhin (NEAR Protocol), Sridhar Ramaswamy (Snowflake CEO, Neeva, Greylock), Jason Warner (poolside.ai, ex-GitHub CTO), Don Ho (Orange DAO, Quantstamp W18), Evil Rabbit (Vercel), John Phamous (SF Compute) and other amazing builders.
How to Apply: email careers+hn [at] puma.tech with your GitHub, a note on what you're most proud of building and what you'd like to build next.
Thank you!
My name is Marius and I am the CTO at AREO (https://goareo.com/).
AREO, founded in January 2023 by a team with 20+ years of combined experience in retail and startups, is a young startup specializing in developing innovative solutions for supermarkets and grocery retail stores. Our cutting-edge B2B SaaS platform optimizes workflows for employees by providing real-time access to inventory, product information, and customer inquiries. We serve large supermarket chains in Germany and across the EU.
About a year ago we brought a backend developer on board through "HN - Who is hiring" and are now seeking a Lead Product Engineer / Engineering Manager and a Senior Android Developer with a minimum of 8 years of experience (preferably in startups) as we just closed another 1M+ ARR contract with a major retail chain and are growing quickly.
For the Product Engineer / Engineering Manager (but not the Android Developer) role professional knowledge of German is highly preferred.
If you're passionate about building innovative retail products from scratch, these roles are for you.
Backend Stack: Ruby / Rails (8.x), StimulusJS / Hotwire / Turbo, AlpineJS, Postgres, Docker, DigitalOcean, OpenAPI, LLMs
Mobile Stack: Kotlin, Room, Jetpack Compose, Hilt Perks: Fully remote roles (Europe), work where you are most productive, sizeable equity in a rapidly growing company, flat hierarchies, no-ego work environment, work in a lean but highly experienced team
Apply here: marius[at]goareo.com and mention “HN - Who is hiring?” and the role you are applying for in the subject.
Our code base is very friendly to new contributors. You'll have a fully-functional development environment within hours (fully automated) and be pushing commits on your first day. Deployments to production happen multiple times per day and finish in less than 2 minutes. Effectively all of our codebase is written in Python, Rust, SQL, Javascript/TypeScript, and Nix. The core technologies you'll need familiarity with to be productive are Python, PostgreSQL, Linux, and Git.
We operate at a larger scale than typical startups. We operate two datacenters with high performance servers we've built that are capable of dealing with the volumes of data we process. We've implemented our own distributed file system. We do full-scale web crawls. We download and perform static analysis on the entire universe of Android APKs and iOS IPAs that are published. Unlike a typical startup where you'll spend half of your time in meetings, and the other half fixing bugs from Jira tickets— at MixRank you'll get to challenge yourself with difficult technical problems that will help you to grow as an individual.
We're hiring continuously for the positions below— they aren't singular positions that will close once filled. Our philosophy on hiring is that the candidate is more important than the position. For each new member of the team, we design a custom role and responsibilities that are specialized to their interests. Other companies will come up with a long list of specific requirements for a position with the expectation that you'll exactly replace someone from the team, or that you'll be the perfect tetris piece that satisfies the job requirements decided by a committee. MixRank is more pragmatic: we'll first get excited about having a unique individual on the team, then we'll figure out the best way to accommodate their specific talents.
-- Junior Software Engineer - Remote (Global), Full-Time
We're looking for remote junior engineers that have 0-3 years of professional experience in software, and 5+ years of curiosity exploring computers, programming, and technical hobby projects. This is an open-ended entry role with mentorship and diverse opportunities to work on all areas of our product: databases, distributed systems, infrastructure and tooling, data analysis, machine learning, frontend/backend web development, APIs, data mining, data modeling, and more. To stand out, please highlight what makes you unique: passion for computing, curiosity and side projects, work ethic, niche research, etc.
Ideally you've already graduated, but if you still have one or more years left of school, please feel free to apply anyway, and if you're the right fit for the team we'll figure out a way to accommodate your schedule. https://www.ycombinator.com/companies/mixrank/jobs/Fnwsojk-j... --
Software Engineer - Remote (Global), Full-Time
We're hiring generalist software engineers to work on web applications, data mining, machine learning/data science, data transformation/ETL, data modeling, database scaling, infrastructure, devops, and more. We'll cater the role to whatever subset of these areas match your interests.
Beneficial experience includes PostgreSQL, Python, Rust, Linux, TypeScript, Nix, frontend/backend web development, and data mining.
https://www.ycombinator.com/companies/mixrank/jobs/RXQspen-s...
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I’m Kiran, Chief of Staff (CoS) at MixRank, a fully remote data startup building go-to-market intelligence. We’re US-incorporated but hire globally, and we’re bringing on new teammates to join a fast-moving team with real ownership and impact.
We are Clutch, building an automated videographer and coaching experience for padel players. We are small but quickly-growing startup with cameras in over 30 clubs around the world. We are hiring for two key positions to enhance our app and our self-designed camera.
Frontend Engineer (Mobile): Experienced mobile developers (iOS, Android) only. Expertise in React Native, PostgreSQL, Amazon lambdas or similar, Amazon s3 or similar. Experience with UI design is a big plus.
Head of Product Design: Expertise in product analytics, modern design tools and design systems. Strong record leading end-to-end design for digital products.
Strong track record of independent projects and passion for racket sports is a big plus!
Full job postings: https://wellfound.com/l/2C12ko, https://wellfound.com/l/2C1w5e
Contacts: Kirill Paramonov (CTO) kirill[at]clutchapp[dot]io, Kári Gunnarsson (CEO) kari[at]clutchapp[dot]io
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. More details from Sequoia: https://www.sequoiacap.com/article/partnering-with-sesame-a-...
Our team brings together founders from Oculus and Ubiquity6, alongside proven leaders from Meta, Google, and Apple, with deep expertise spanning hardware and software.
Open Roles: https://jobs.ashbyhq.com/sesame
- ML Engineers
- Product Designers
- Product Managers
- iOS & Android Engineers
- ML Model Serving Engineer
- Embedded OS Architect
- Mechanical Engineer, Product Design
- Embedded Engineers
- Electrical Engineer
- Audio Systems Engineer
We make people do push-ups before opening addictive apps - verified through camera pose detection. Our goal is to replace doomscrolling with exercise.
500k+ downloads, bootstrapped and profitable, very quickly growing.
Looking for someone strong in Kotlin Multiplatform + Compose Multiplatform + Swift/SwiftUI who works independently, uses AI to ship fast, and can implement a pixel-perfect Figma design.
Bonus: Supabase, Amplitude, native Android/iOS knowledge (e.g., Screen Time).
Small team, work directly with founders, long-term role. We’ve got big plans to make Pushscroll the app of the year, and there are a lot of challenging problems to get there.
Reach out: contact@pushscroll.com
Charted Sea is a small, bootstrapped SaaS company helping customers scrape very complex platforms such as Shopee (a major e-commerce platform in Southeast Asia). We focus on hard technical problems (anti-bot, browser automation, fingerprinting, captcha solving).
We are hiring a senior engineer to take ownership of our core platform: scraper orchestrator, billing & payments, customer dashboard, and parts of our AI-based captcha tooling. This is a hands-on role with real ownership: architectural decisions, setting standards, and gradually mentoring other engineers. The role is very full-stack (infra, backend, frontend).
Stack includes TypeScript (most backend & web), Rust (new backend services, migration in progress), Go (Android scraper), PyTorch (captcha solvers), PostgreSQL, Redis, GitHub Actions, Ansible, Ubuntu Linux, bare-metal Hetzner servers.
We are profitable, demand is growing fast, and engineering bandwidth is the main bottleneck. Team is small (3 engineers), fully remote, mostly async (we expect ~4h overlap with UTC+8).
Compensation: $80k–$120k USD base (depending on experience) + monthly bonus tied to company revenue (10% of net revenue shared with employees).
Apply by emailing marc.plouhinec@chartedsea.com with a short intro and CV/GitHub. I'm the founder and will personally read and reply.