Polymath | Founding MTS, Full-Stack | San Francisco | ONSITE (5 days) | $160K–$220K + 0.75%–1.5% equity | https://polymathmade.com

Polymath builds AI agents that read engineering drawings, generate CAD models, and rebuild parts across CAD systems. We're VC-backed, Harvard- and Stanford-founded, in production with our first product, and running pilots with Fortune 100 manufacturers in aerospace and consumer hardware.

We're hiring our first dedicated full-stack engineer to own the product stack end to end: the chat UIs inside CAD (TypeScript/React over MCP and REST), the Python/FastAPI services behind them (auth, job orchestration, metered billing with Auth0 and Stripe), and the pipeline that packages and deploys it all. You report to the CEO, join customer calls, and set the standards for the next ten hires.

Looking for: 5+ years running production web apps with ownership across front end, API, and deployment; prior early-stage experience (first 50 engineers somewhere); TypeScript and Python; shipped on AWS or GCP with Terraform/CloudFormation and Kubernetes/ECS/Cloud Run. Nice to have: LLM product ops, enterprise SSO, C#/C++ desktop packaging, any CAD or mech-eng curiosity.

Must be authorized to work in the U.S. Immediate start.

Apply: email careers@polymathmade.com with a resume, a GitHub or portfolio link if you have one, and a few sentences on a system you built and ran in production. I read every application and reply within a week. Full JD: https://polymath-ai.notion.site/careers-1

OpenTrain AI | REMOTE (US) | Part-time | Backend Engineer, AI Coding Task Design

OpenTrain AI connects experienced professionals with paid, part-time AI training work. We are the hiring company and are actively filling this role.

- $30–$100 per hour equivalent, paid per accepted task - 100% remote, United States - About 15 hours/week; choose your schedule

We need backend engineers to design realistic coding tasks for AI systems, write deterministic verifiers, assess correctness and code quality, and apply secure coding and security review where relevant. This work helps improve AI systems that write software.

Ideal background - Strong professional backend experience with Python, Java, Node.js, Go, Rust, TypeScript, C++ or similar - Scalable APIs/services, complex features, debugging, bottleneck resolution and code review - Strong analytical, problem-solving and technical communication skills; professional English - Helpful: application security, secure coding, vulnerability assessment, penetration testing, OWASP/CWE or security-focused code review - No AI experience needed; structured task-design guidelines and verification criteria are provided

Independent contractor; pay is per accepted task. Fully remote and flexible, with no fixed shifts. Apply on OpenTrain (resume upload): https://app.opentrain.ai/api/out/cmu9linxg000o0bgm9xiw33b9?c...

Then complete a short application on the hiring platform. Shortlisted applicants take a short AI interview.

Nirvana Robotics | Mechanical Engineer, Electrical Engineer, Robotic Controls Engineer | New York, NY | ONSITE | Full-time | $220K-$300K

Nirvana Robotics builds humanoid robots with robotic arms that work in industrial environments. Their hardware team in NYC is growing, and each of these roles owns a subsystem end to end on physical robots. I'm a recruiter at Niuro, Nirvana's hiring partner for these roles; the links below go to our application form and I read every application myself.

Mechanical Engineer ($230K-$260K): mechanical design of robotic arms and manipulators: joints, actuators, transmissions, end effectors. You optimize for torque density, backdrivability and stiffness, prototype with additive and precision machining, and take assemblies to production. GD&T, tolerance stack-ups, SolidWorks (or Creo/NX/Onshape). Apply: https://app.niuro.io/source/H4yYHesP?ref=ps_EBRp88zU7jcdRZm8...

Electrical Engineer ($220K-$250K): electrical architecture for arms and humanoids: power distribution, motor-driver boards, sensor PCBs, harnessing. Multilayer mixed-signal and high-current layout in Altium, BLDC drivers and current sensing, bench bring-up and DFM with PCBA partners. EtherCAT, CAN or BMS is a plus. Apply: https://app.niuro.io/source/BeVx3CrN?ref=ps_5biniQ0FTotNxfmT...

Robotic Controls Engineer ($270K-$300K): low-level control for multi-DOF arms: joint-level actuation, impedance/admittance and whole-body control, sim-to-real. PID/LQR/state-space, MoveIt or cuRobo, C++ and Python, ROS 2. Apply: https://app.niuro.io/source/gUNqx8Lj?ref=ps_BdIAhZPrP7yQt2P4...

For all three: hands-on work on real robot hardware (arms, grippers, mobile manipulators, actuated joints or humanoids). Mechanical and Electrical: 5+ years with a bachelor's or 3+ with a master's. Controls: roughly BS + 4 years, MS + 2 or a PhD. US-based; relocation to NYC within the US is supported. Visa sponsorship is not available.

Location: Istanbul, Türkiye Remote: Yes Willing to relocate: Yes Technologies: C/C++, Rust, Python, Linux, RTOS, TCP/IP, eBPF/XDP, WebRTC, UWB/BLE, embedded/IoT & mesh-connected devices, PostgreSQL, Docker, AI/LLM systems

Résumé / Portfolio: https://msakg.com GitHub: https://github.com/imsakg LinkedIn: https://linkedin.com/in/msakg Email: contact@msakg.com

Lead AI Agent Software Engineer focused on real-time, performance-critical systems across AI, networking, embedded devices, and production infrastructure.

My background sits at the intersection of software and the physical world:

• Currently leading architecture and production hardening of a real-time multimodal AI agent platform — streaming STT → LLM/tools → TTS, WebRTC, asyncio, long-lived state/memory, retrieval, observability, failure handling, cancellation, backpressure, and latency-sensitive execution.

• Previously built real-time networking software for aerial systems using Rust, Linux, eBPF/XDP and IEEE 802.1 TSN concepts, including reliability mechanisms where deterministic behavior and low fast-path overhead matter.

• Earlier developed C/C++ bare-metal and RTOS firmware for access-control/security and embedded/IoT devices — TCP/IP, UART/I2C/SPI, RS232/RS485, Modbus, secure device communication, UWB/BLE localization, sensors, relays and constrained hardware.

I’m most interested in difficult engineering problems where timing, reliability, networking, hardware constraints, and user-facing behavior meet: mission/performance-critical software, real-time systems, embedded/IoT, access control, UWB, distributed device systems, AI infrastructure, backend/platform engineering, and systems software.

I enjoy owning systems end-to-end — architecture, implementation, debugging, benchmarking, deployment, production incidents, and the less glamorous failure modes that only appear in real environments.

I’m looking for a strong engineering team tackling genuinely hard technical problems. Open to Lead/Senior Software, Systems, Embedded, Platform, Backend, Real-Time AI, or similarly hands-on engineering roles.

If you're building something where milliseconds, reliability, hardware, networks, or production correctness actually matter, I'd be very happy to talk.

VALIS (Valis Insights) | Software Engineer, new product line | REMOTE (US, East Coast hours) | Full-time | $125k-$155k + equity

I'm Caleb, co-founder/CTO. VALIS builds data products for scrap metal recyclers. Our product images, weighs, and classifies scrap metal, and our platform turns that into actionable quality analytics to improve physical ops at plants across the US. Recycled metal takes a fraction of the energy of mined metal, and better data means more of it gets recovered.

We're hiring an engineer to build our next product line: a production tracking and analytics platform for recycling plants, extended from our existing product. We're a small team (<10 ppl). What you'd work on (ideate, build, deploy, own):

- Modeling a complex (and intellectually stimulating) physical process

- Agentic features that dig through production and quality data, surface trends, flag anomalies, and notify the right people

- Working directly with customers: regular calls with operators and plant managers, plus a few site visits a year

You should have 3+ YoE, strong data modeling fundamentals, and enjoy owning ambiguous problems end to end. We care more about how you think than what exactly you've used. Recycling, ERP/MES, or physical ops software experience is a plus.

Our stack: React/TypeScript, C#/.NET, PostgreSQL, AWS.

US work authorization required; no sponsorship.

Apply (read the whole JD, mention HackerNews): https://apply.workable.com/valis-insights-1/j/9D0C64C055 Questions: caleb[dot]ralphs[at]valisinsights[dot]com

Flow Traders | Research Engineer | Hong Kong | Full Time | Visa | Relocation Flow Traders is a leading proprietary trading firm with an entrepreneurial and innovative Tech culture at the heart of its business. We are looking for Research Engineers in our Hong Kong office. Join us build and scale the research framework behind our systematic trading models. You’ll work closely with Quantitative Researchers, drive end‑to‑end ML pipelines, and shape global standards for data‑driven model development. Research Engineers have joint responsibility for conducting research and delivering models. You’ll thrive if you have: - 8+ years in ML / Data Science / Research Engineering (Postdoc/Faculty can count towards this); - Strong Python and libraries such as Ray, numpy, PyTorch, and pandas; - Solid math/stats background; - Experience with modern dev practices & cloud technologies. If you're interested, apply here: https://www.flowtraders.com/careers/job-description/7431246

Flow Traders | C++ Senior Software Engineer | Hong Kong | Full Time | Visa | Relocation We are looking for a Senior C++ Software Engineer, you'll help design and optimize next-generation market data and execution platforms powering systematic trading across hundreds of venues. The role covers high performance market data ingestion and order execution, building and optimizing trading systems. To succeed you will need to have: - 5+ years of C++ experience in HFT/ financial sector -Strong knowledge in one or more APAC markets If you are interested, apply here: https://www.flowtraders.com/careers/job-description/8212740

Or if you'd like to see other roles at Flow Traders, please check our careers website: https://flowtraders.com/careers/

America First Policy Institute - Office for Fiscal and Regulatory Analysis | ONSITE (US) | Full-time | https://www.americafirstpolicy.com/careers

The America First Policy Institute (AFPI), a 501(c)(3) non-profit non-partisan research institute, exists to advance policies that put the American people first. Its Office for Fiscal and Regulatory Analysis (OFRA) aims to make government policy easier to understand, reform, and reorient for the American people. OFRA's open-source tools help policy professionals simplify and streamline legislative design and rulemaking. Its analyses highlight major budgetary risks and opportunities. Its voter education products enable the average American to understand the policy impact on their lives. All of OFRA's work is built to be accessible, transparent, and reproducible.

1. Visiting Fellow - https://americafirstpolicy.com/careers/visiting-fellow-offic...

2. Fellow - https://americafirstpolicy.com/careers/fellow-office-for-fis...

3. Research Engineer - https://americafirstpolicy.com/careers/research-engineer/

4. Senior Advisor - https://americafirstpolicy.com/careers/senior-advisor-office...

5. Program Assistant - https://americafirstpolicy.com/careers/program-assistant-off...

Beacon AI | 3 days hybrid in San Carlos, CA | https://beaconai.co/careers Due to U.S. export control regulations, we can only hire U.S. Persons (U.S. citizens, Green Card holders, lawful permanent residents, or individuals granted asylum or refugee status).

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 Senior/Lead Engineers with 5+ 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:

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

++ Senior Security Engineer [FedRAMP ATO/SSP or DoD IL4/IL5, AWS/GovCloud]

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

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

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

Meta | Security Engineer (Senior / Staff) | ONSITE Bellevue, Menlo Park, New York, Washington DC — Staff role also REMOTE (US) | Full-time

Meta's Central Security team is hiring Security Engineers at two levels (same team, same work):

- Senior (IC5): https://www.metacareers.com/profile/job_details/140745796424... - Staff (IC6): https://www.metacareers.com/profile/job_details/548694391486...

    We find weaknesses before attackers do, then build the solutions that eliminate them. You'll be the expert engineering and product teams turn to for AI security and native-code security guidance, providing security guidance on a constant stream of new products, leading internal security/privacy initiatives, assessing and responding to internet threats, and conducting security assessments specializing in mobile platform and application code. The work protects 3B+ people.

    Looking for: B.S./M.S. in CS or equivalent experience; 6+ years (IC5) / 8+ years (IC6) in security engineering (vuln research, pentesting, or assessments of production systems); 4+ years reviewing C/C++ with secure coding practices; programming in Python/C++ or similar; security architecture and least-privilege experience on internet-facing products.

    Nice to have: iOS/Android security model, VM escapes, exploitation / reverse engineering / CTF, static analysis and fuzzing, Rust / Obj-C / Java/Kotlin, community contributions (research, talks, bug bounty), and experience using AI tools to improve security workflows.

Location: Huntington Beach, CA, USA Remote: Yes Willing to relocate: No Technologies: C#/.NET, TypeScript, React, PostgreSQL, Linux, AI-assisted development (Claude Code and similar) Résumé/CV: https://aiwebcenter.com/about/resume/ Email: hello@aiwebcenter.com

Fractional CTO and contract work: web apps that do real work (booking, ordering, portals, quoting), modernizing older systems, and shipping faster with AI coding tools without losing quality. Twelve working examples you can click through: https://aiwebcenter.com/work/examples/

Vivral (Nair Engineering) | ML, Systems (GPU), Hardware, and Embedded Engineers | Gainesville, FL (UF students) | Part-time | Equity

Vivral is an AI health assistant that helps people understand their health. We run frontier-grade medical AI on ordinary computers instead of the cloud, so health support can reach remote, underserved communities. Already tested by researchers at UF, Michigan, and Princeton.

We're hiring part-time student engineers (sophomores through PhD): Machine Learning (PyTorch, LLMs), Systems (CUDA/Triton, making large models run fast on everyday hardware), Hardware (FPGA, digital design), and Embedded (C/C++ firmware). Roles are built around class schedules and come with equity that vests over time.

Apply (10 minutes): https://forms.gle/PrewX9oGEj7fCMR46 More: nairengineering.com

Scholarly | Founding Product Designer | Seattle, On-Site | Full-Time | $160k - $190k + equity + health benefits

Scholarly is building the HR operating system for higher education. We've built a software platform that enables our customers to make data-driven decisions and to automate essential processes like performance reviews, tenure processes, leave workflows, and more. We are a venture-backed seed stage company of experienced, motivated, and collaborative folks. We are backed by leading investors in the industry and working with some of the best universities in the US. The team comes from Gusto, NASA JPL, Amazon, Outreach, and others.

We're looking for a collaborative product designer (design engineer?) to join the team in Seattle. This is our first full-time design hire!

If interested, please apply here: https://jobs.ashbyhq.com/Scholarly/1762c64d-6a6b-4f13-9267-c...

Curiosity (https://curiosity.ai) | Forward Deployed Engineer, DevOps Architect | Toulouse, France | ONSITE | Full-time (CDI) | Visa support

Curiosity Studio builds internal apps and agents from a plain description, on a company's connected data and inside its permissions. It runs on premises or in a private cloud, with any LLM. We're bootstrapped, profitable and based in Munich. Our customers are large industrial and regulated companies, Airbus among them, and Studio has 30TB+ of data connected in production.

We are starting a team in Toulouse that works at customer sites, in French and English, along with the engineers who build Studio.

Forward Deployed Engineer: take a customer's problem from the first workshop to production. You decide with them what Studio should build, connect their systems, model the data as a graph, and oversee the C#/.NET connectors and services it needs. You also ship features and agents on top.

DevOps Architect: Own deployments in customer environments, from the first technical discussion to handover, on private clouds or data centers. Networking, IAM, Linux, Docker, monitoring, backups, upgrades, incidents. You also write code alongside the forward deployed engineers.

We're looking for hands-on builders who enjoy working directly with customers. Full-stack project experience preferred. Fluent French and English required.

Interviews: a 30 minute call, a technical conversation, then the founders.

CV to jobs@curiosity.ai, mention Hacker News. Details: https://curiosity.ai/careers/

SerpApi | https://serpapi.com | Junior to Senior Fullstack Engineer multiple positions | Customer Success Engineer | Hiring Coordinator | Python/Ruby/PHP/Js/Rust/Kotlin/C#/Crystal/Nim/Elixir Developer Advocate positions | Based in Austin, TX but remote-first structure | Full-time | ONSITE or FULLY REMOTE | $150K - 180K a year 1099 for US or local avg + 20% for outside the US

SerpApi is the leading API to scrape and parse search engine results. We provide 100+ APIs to Google, Google Maps, Google Images, Bing, Baidu, and more.

Our current stack is Ruby, Rails, MongoDB, and React.JS. We are looking for more Junior and Senior FullStack Engineers.

We have an awesome work environment: We are a remote first company (before Covid!). We do continuous integration, continuous deployments, code reviews, code pairings, profit sharing, and most of communication is async via GitHub.

We value super strongly transparency, do open books, have a public roadmap, and contribute to the EFF.

Apply at: https://serpapi.com/careers

DuckDuckGo - we are looking for candidates that are excited to join us on a mission to raise the standard of trust online. All of our roles are fully-remote, except where specific locations are noted.

Senior Web Security Engineer, Browser Platform - https://jobs.ashbyhq.com/duck-duck-go/a447e823-fd8f-438f-909...

Senior Backend Engineer - https://jobs.ashbyhq.com/duck-duck-go/53022b02-da3d-4fda-827...

Staff Data Scientist - https://jobs.ashbyhq.com/duck-duck-go/9c381171-f346-4d7a-876...

Senior Data Scientist - https://jobs.ashbyhq.com/duck-duck-go/a447e823-fd8f-438f-909...

Director, Paid Marketing (Subscriptions) - (Remote within USA) - https://jobs.ashbyhq.com/duck-duck-go/f8570953-8ea3-4955-bfb...

Senior Product Partnerships Manager (Remote within USA or Canada) - https://jobs.ashbyhq.com/duck-duck-go/dc1027ae-8f6a-44eb-b11...

Senior C++ Engineer - https://jobs.ashbyhq.com/duck-duck-go/af93b075-d60a-4686-abe...

Senior Privacy Engineer - https://jobs.ashbyhq.com/duck-duck-go/80797cf4-64b2-4e94-9d8...

Senior Web Compatibility Engineer - https://jobs.ashbyhq.com/duck-duck-go/d02d7598-141b-4a84-bdf...

and MORE: https://duckduckgo.com/hiring

Mozilla | Sr. Staff Software Engineer, Browser (New Products) | REMOTE (US or Canada) | Full-time

Mozilla's New Products group is a small team building new things on top of browser engine technology. We're hiring a hands-on, senior IC to run experiments inside browser engine internals and find out which ideas actually hold up.

What you'd do: design and build experiments in engine subsystems (DOM, layout, accessibility, JS runtime, networking), prototype features that let programs interact with web pages reliably, and measure everything. That means repeatable benchmarks, profiling overhead, and writing up the experiments that didn't work too. You'll use AI tools heavily, but you'll verify what they produce by testing and measuring it.

You likely have: deep experience in at least one browser subsystem, strong C++ or Rust, comfort in a very large codebase, a solid grasp of how the web platform behaves, and a real interest in AI agents and their tooling. Contributions to Gecko, Servo, Blink or WebKit are a big plus.

US: https://job-boards.greenhouse.io/mozilla/jobs/8265116

Canada: https://job-boards.greenhouse.io/mozilla/jobs/8265117

Postscript (YC W19) | Senior Software Engineer, Full Stack | REMOTE (US, Canada) | Full-time | $180K to $220K base + equity

Postscript is an agentic retention marketing platform (SMS, RCS, Email) used by 20,000+ Shopify brands. We’re Series C and pacing toward profitability.

We’re rebuilding the platform from the ground up in Rust for the AI era, so the work mixes real scale problems (high-throughput messaging, deliverability, data pipelines) with a ton of 0 to 1 greenfield work where you shape the architecture.

Looking for senior engineers comfortable across the stack who are excited about Rust and like owning problems end to end. Fully remote team of ~250.

Apply: https://www.ycombinator.com/companies/postscript/jobs/ktOBqU...

Thunder Compute (YC S24) | C++ Systems Engineer | San Francisco (Onsite) | Full-time | Visa sponsorship | https://www.thundercompute.com

We run a GPU cloud on systems software we built from scratch in C++. We're hiring for our systems engineering team; designing the distributed system behind what is essentially a hypervisor for GPUs.

You'd report to Brian, our CTO (ex-Citadel Securities quant dev). Team is from Citadel Securities, Aquatic, Old Mission and AWS. Series A, $17.5M+ from Matrix and YC.

Comp: $250–325K base, 0.1–0.3% equity, highly competitive profit-sharing bonus pool. Currently there are $3.3M in bonuses entering this pool tied to gross-profit milestones.

Apply: https://jobs.ashbyhq.com/thundercompute/2efae53b-817c-43e7-9...

If you're cracked at systems software and want to do something more meaningful than creating liquidity, reach out.

More at https://www.thundercompute.com/careers. Mention HN when you apply.

CNH | AI Engineer Intern | Tempe, AZ, USA | ON-SITE | Summer internship (40 hours/week, May–August)

Work on autonomy and precision agriculture, applying AI, machine learning, and computer vision to real-world agricultural problems. You'll help develop, evaluate, and deploy models alongside our engineering team.

Stack: C++, Python, PyTorch/TensorFlow, ONNX, TensorRT, Git.

We're looking for strong programming skills and a solid understanding of ML fundamentals. You must be a current college student actively pursuing a degree. Visa sponsorship is not available.

Apply: https://join.cnh.com/job/AI-Engineer-Intern/5686-en_US

Mastra | Founding Sales (Founding AE) | US Remote | Full-time

Mastra is the open-source TypeScript framework for building AI agents (agents, workflows, memory, evals, tracing). From the team behind Gatsby, YC-backed, https://github.com/mastra-ai/mastra

Why: Four months ago Mastra was a very popular open-source agent framework with very little monetization. Then we launched our platform, and now we're closing a couple of deals a week. Pipeline is growing faster than one person can work it, so this is our second dedicated sales hire. You start day 1 with a warm pipe: most leads are already using the open-source framework.

What you'd sell: Platform (Studio, Server, infra to run/debug/observe agents in production, hosted or self-hosted for regulated orgs), Agent Builder (agents without code), and Concierge (embedded Mastra engineers working alongside customer teams). Full-cycle, mid-market: Series A–C, often with regulatory or infra constraints, sales cycles of a few weeks, talking to eng leaders.

You have: Closed full-cycle deals in dev tools, OSS, infra, or AI. Enough technical depth to come across as a smart PM with engineers: understand their use cases and scope a solution. Founder or founder mentality. Comfort with a product that ships something new every week.

Apply: { https://jobs.ashbyhq.com/Mastra/d5fe8d36-843a-4f9b-9d65-779e... } We get back to everyone.