At CloudX (https://cloudx.io) we’re building a new supply-side advertising platform for mobile publishers. Yes, it's ads, and yes, there's AI involved, so stop reading here if that's not interesting to you.

It's a gnarly infra problem with huge scale, combined with an interesting product space that we think legitimately benefits from tasteful AI automation. We're doing cool things with Nitro Enclaves to prove that our auctions are fair. And our founding team have done this before with great success, first at MoPub (sold to Twitter) and MAX (sold to AppLovin).

We're hiring (all remote) for:

- Senior Fullstack Engineer https://jobs.gem.com/cloudx/am9icG9zdDogum5THF3fORqb1eEupFQx

- Senior Infrastructure Engineer https://jobs.gem.com/cloudx/am9icG9zdDo4vl4A1sEcc7sDQf8ZYiqR

- Senior Android SDK Engineer https://jobs.gem.com/cloudx/am9icG9zdDqPAWu1cxr3PmEuuTIdliI6

- Senior iOS SDK Engineer https://jobs.gem.com/cloudx/am9icG9zdDpOy3Qmt1fLsOu4gKwtwWTz

Our philosophy is to keep the team small, well-paid, and productive. We deploy every day and our monorepo CI suite takes about a minute to pass.

The best way to apply is directly through those jobs pages but if you have other questions you're welcome to email me at peter@cloudx.io. I always post here on HN because it's where I got my career started back in highschool; I will personally make sure you get a response if you apply.

Pushscroll | Full-Stack Mobile Engineer (KMP) | REMOTE (GMT-3 to GMT+4)

Screen-time app that makes you do push-ups before you can scroll addictive apps. 350k+ users.

Looking for someone strong in Kotlin Multiplatform + Compose Multiplatform + Swift/SwiftUI who ships fast and isn't afraid of platform-specific APIs (Screen Time on iOS, Accessibility/UsageStats on Android).

Stack: Supabase (auth/DB/edge functions), Superwall, Amplitude, MediaPipe for pose detection. We use AI coding tools quite a bit and expect you to as well. Good design sense matters - you'll be translating Figma → production UI.

Small team, work directly with founders, long-term role with a lot of impact. Reach out: contact@pushscroll.com

Pump Up | https://pumpup.com | React Native (Expo) Engineer | Remote | Full-time

We’re a small, technical founding team in based in SF building an assistant for tradespeople — electricians, plumbers, contractors. Our app turns job site voice notes and photos into structured job records, quotes and invoices. We’re seed-funded, ship fast, and spend a lot of time with users in the field, building practical AI that saves people real hours every week.

We’re hiring a React Native engineer to own big chunks of the product across iOS, Android and Web. You’ll work directly with the founders and take lead on the mobile client. If you like autonomy, fast iteration, and shaping product you’ll fit right in.

Experience with React Native Web, native media pipelines, or AI workflows is a bonus. The role is remote, but some overlap with PST is important. Compensation ranges depending on location.

See https://pumpup.com/careers or email me directly at mands@pumpup.com if you want to build tools that make real work easier.

Musa — Mobile Engineer (iOS/Android) — Remote (Americas)

Musa is a mobile app helping women understand their hormonal health through a cycle tracker with personalization and a small companion character. Thousands use it daily.

We’re a small team, ship fast, and follow a Shape Up-style process. Low meetings, high ownership.

You will - Own our iOS and Android apps

- Shape and build features end to end

- Ship often to a user base that shares the product organically

- Tackle challenges in personalization (AI), performance and UI delight

You

- Enjoy building and care about quality

- Like autonomy and product thinking

- Have strong Swift/Kotlin experience

Links Role: https://www.notion.so/Mobile-Senior-Software-Engineer-L5-2b1...

App: https://apps.apple.com/us/app/musa-period-self-care-pet/id65...

Chat: https://calendar.app.google/4mYzMx7tKRbCNosg8

MixRank (YC S11) | Software Engineers | 100% REMOTE (Global) | Full-Time MixRank processes petabytes of data every month from web crawling. We have hundreds of customers using our data products including Google, Amazon, Facebook, Intel, and Adobe, across industries including Finance, Recruiting, Sales, Marketing, and Security.

We’re a fully-remote company with a global footprint in over 20 countries. We're growing, profitable, employee-owned, no dependence on outside funding. Applicants from all geographies and backgrounds are welcome.

We are looking for passionate individuals for whom programming is not just a job but it’s something they love to do. We're obsessed with computers, programming, big data, databases, compilers, hardware, math, data science, and the internet. Does this sound like you? Please apply to join our team.

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...

--

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.

Puma.tech | Remote-first with PST overlap | iOS/MacOS, Android, Ai/ML, Growth | https://puma.tech

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 iOS & Android – browser with built in LLMs & Wallets. Private by design.

2. Puma AI 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!

Shape the Future of Construction Through Software!| Hiring Fully remote in the US, Fulltime

Fieldwire is a construction field management software building world-class tech to disrupt the $10 trillion construction industry! With 2M projects worldwide, we have partnered with over 5000+ clients in 100+ countries and 14 languages. We got acquired by Hilti in November of 2021! If you are looking to disrupt and modernize an industry that has been neglected by tech for years, feel free to apply!

iOS Engineer (US - Remote) - 3+ yrs of experience, BS or MS in CS or equivalent experience. Apply here: https://grnh.se/50hoz2kg2us

Android Engineer (US - Remote) - 0.5+ yrs of experience, BS or MS inc CS or Equivalent experience. Apply here: https://grnh.se/3452vy6n2us

Check out our other roles here: https://www.fieldwire.com/jobs/

www.Fieldwire.com https://engineering.fieldwire.com/

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 tim@radar.com

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. Read more from Sequoia: https://sequoiacap.com/article/partnering-with-sesame-a-new-...

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:

- 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

Beacon AI | San Carlos, CA | Hybrid (On-Site) | Full-Time | www.beaconai.co Beacon AI builds intelligent systems that make aviation safer and more autonomous. We’ve completed multiple DoD programs and are expanding our team with exceptional technical leaders to push the boundaries of human-machine collaboration in the cockpit.

At Beacon, you will lead by example, mentoring and growing a small team of talented engineers (typically 1–2 to start) while staying hands-on in design and execution. You’ll help shape critical systems that advance aviation safety and autonomy, working alongside a team that values effort, creativity, and accountability.

We’re hiring Lead Engineers with 5-9 YOE who love solving complex problems. At Beacon, you’ll own your work end-to-end, from prototype to deployment, and literally see your code take flight in real world aviation environments! Roles:

++ Lead iOS Engineer [Tech Stack: Swift, SwiftUI, UIKit, Mapbox]

++ Lead Infra/Backend Engineer [Tech Stack: AWS]

++ Lead WebApp/FrontEnd Engineer [Tech Stack: Python, Typescript, React]

++ Lead Autonomy/Robotics Engineer [Tech Stack: C++, Python, iOT]

++ Lead Security Software Engineer [Skills: Ability to perform hands-on security engineering tasks, CMMC Compliance Knowledge]

Join us at beaconai.co/careers. Mention in the application that you saw our post on HN.