Trace Labs | Remote (USA) | Full Time | https://tracelabs.ai/

Want to join a lean, ambitious, and fast growing startup?

Trace is building the data marketplace for physical AI. Robotics and embodied AI are bottlenecked by real-world data. We’re building the platform that turns real-world human work into structured training datasets for robotics and foundation model labs. We’re hiring engineers to help build the core product from end to end.

Small, senior team. Fully remote. Experienced founders with a successful exit. Clear communicators. High trust, high bar.

Open Roles

- Full Stack Software Engineer: https://jobs.ashbyhq.com/tracelabs/963005ce-f4f1-4d54-957d-1...

- Backend Software Engineer: https://jobs.ashbyhq.com/tracelabs/a80546f7-6253-4dfa-95be-c...

What We Offer

- Autonomy, impact, and ownership. As an early employee you’ll shape the product direction and company values.

- Competitive salary and significant equity in a fast growing, early stage startup.

- Remote employment - work where you want, when you want.

- Generous vacation policy - take time whenever you need to recharge. Building a lasting company is a marathon, not a sprint.

Amodo Design (https://amododesign.com/) | Sheffield, UK | Software Engineer | Onsite or Hybrid

We are hiring software engineers who enjoy solving important real-world problems and working close to hardware; who learn new domains quickly and prefer practical solutions over over-engineered systems or unnecessary complexity.

You’ll work on the projects best suited for you. Projects range widely, and include:

- Scientific tools

- Automation & robotics (Linux & ROS level)

- Embedded C/C++ (typically owned by dedicated firmware engineers, but software engineers are welcome to learn!)

- Linux, CUDA, Server engineering for our AI safety, security, and verification work

- Custom simulation software (usually python)

- Data analysis pipelines (python)

- Organisational tooling (Typescript, react, postgres, etc.)

Structure: Small teams of software, mechanical, electronics, and firmware engineers build end-to-end systems, typically shipping within a few months.

Apply: https://amododesign.com/career

Rad AI | Remote in US+Canada, and new office in San Francisco at 2nd+Market Empowering physicians with best-in-class AI radiology solutions to save time, reduce burnout, and improve patient care. Series C with tremendous momentum.

High-priority technical roles in ML, Senior Cybersecurity Analyst, Infrastructure Engineering

Unique Head of Continuity role, looking for former founder with strong technical background and product sense

See all open roles and apply here >> https://www.radai.com/careers?utm_source=W29wy29rlJ

Fieldguide (fieldguide.io) | San Francisco, CA | HYBRID | FULLTIME

Vertical AI SaaS for Accounting & Audit | Fieldguide is a 150 person Series C start-up transforming how audit, advisory, and assurance work gets done. Fieldguide brings professionals and agentic AI together to modernize engagement delivery from planning through close, enabling audit and advisory practitioners to deliver higher-quality work, strengthen client experiences, and unlock growth for the decade ahead.

Hiring: - All Levels: AI Platform and Product Engineers

- All Levels: Infrastructure Engineers

- Lead Product Designer

- Forward Deployed Engineers

- Software Engineer, AgentOps

- Lead Security Engineer

- Lead Compliance Manager

Apply here: https://www.fieldguide.io/careers?utm_source=HackerNews

Fold | Remote (US Only) | Senior Back End Engineer | Full-time

Fold is a publicly listed bitcoin financial services company building the tools people need to earn, buy, sell and live on Bitcoin. We're looking for a Senior BE Engineer to help build the financial infrastructure behind our products - payment processing, ledger systems, card transaction flows and event-driven pipelines.

  - 5+ years software engineering experience
  - Strong in: Java or similar (Kotlin, Scala, C#)
  - Experience with: production microservices, distributed systems
  - Familiar with: messaging/event streaming (Kafka, Pulsar)
  - Solid relational database and data modeling skills
  - Nice-to-have: fintech, payments, ledger/accounting domains
  - Nice-to-have: event-driven architectures, CQRS, event sourcing
  - Nice-to-have: Micronaut, Quarkus or similar modern Java frameworks
  - US residency (regulatory requirement)

Benefits: - Competitive salary + equity - 401k with 3% match - Unlimited PTO + yearly vacation stipend - Full health/dental/vision - Paid parental leave - Regular team meetups - Bitcoin starter pack (hw wallet included)

Email tiffany.sawhney (a) foldapp.com if you have questions or apply here: https://ats.rippling.com/fold-inc/jobs/514ba20e-a93e-4960-ad... [0] https://foldapp.com

Zattoo | Video Engineer / Engineering Manager / Principal Engineer | Berlin, Germany | Onsite + Hybrid | Full Time

Multi roles in the video engineering space: Streaming, Encoding, C++, Golang, CDN, Media Delivery, Live, VOD, vodever!

Zattoo: Back in 2005, we pioneered Europe’s first TV streaming service. Today, we’re the world’s first certified climate neutral TV streaming provider. 3 million users across three countries. Over 230 colleagues of 47 nationalities.

// Video Engineer (C++): https://grnh.se/jl0287q2teu

// Engineering Manager - Ingest & Storage: https://grnh.se/10frzmw2teu

// Engineering Manager - Streaming & CDN: https://grnh.se/yces6q02teu

// Principal Engineer Streaming & Ad Technologies: https://grnh.se/pv4nrr62teu

Rubin Observatory / SLAC | Menlo Park, CA REMOTE (US) | SRE / Software Engineer | Full-time

The Vera C. Rubin Observatory in Chile is a new world-class astronomy facility designed to create a 10-year time-lapse map of the southern sky. Featuring the world’s largest digital camera it emits 20GB of raw pixels per minute, and we are developing the Prompt Processing System that will distribute an alert on every astrophysical object that has moved, changed or appeared in real-time. (https://rubinobservatory.org/news/first-alerts)

This appointment is based at SLAC, a DOE-funded national laboratory hosting the data facility and many of the 80 scientists and engineers of the world-wide Rubin Data Management team. (https://www6.slac.stanford.edu/)

Keep Rubin's Alert Stream flowing. We are hiring an SRE to own the reliability of our Prompt Processing Framework, a Kubernetes-based, event-driven system using KEDA, Redis Streams, Kafka, and Postgres to scale near-real-time processing. You’ll write software to improve resilience, operate and evolve core infrastructure services, and build the monitoring, alerting, and on-call practices that keep the system robust and reliable during nightly observing operations.

Stack: Python, Kubernetes, Helm, ArgoCD, Kafka, Redis, KEDA, InfluxDB, PostgreSQL, Cassandra.

Details and apply here: ls.st/sre-ad

Sage | Engineering & Product | Hybrid (2 days remote, 3 days in New York City/NYC area) | Full-Time | https://www.sagehealth.com

We're building hardware & software systems to improve elder care, and we're used by thousands across the US. Want to know that your work is directly improving people's lives? Come talk to us. https://www.sagehealth.com/company/careers

We also just announced our $65 million Series C round led by Goldman Sachs this week.

Current roles include:

> Senior Applied Machine Learning Engineer - for our fall detection product team

> Senior Software Engineer - Data & Integrations - for business-critical data flows

> Senior/Staff Software Engineer - Edge - for our IoT systems

> Staff Data Product Developer - engineering for customer analytics

> Tech Lead/Manager, Native - to be posted; for our mobile native app strategy

Keep an eye on our Careers page, and feel free to reach out to alisa [at] sagehealth dot com with questions.

Microsoft AI | Platform Engineering | Full-time | Greater Seattle Area, WA or Bay Area (Mountain View), CA | ONSITE (4 days/week)

We're building the platform primitives that power https://copilot.com (Microsoft's ChatGPT). If you've shipped systems at scale—whether backend services, distributed infrastructure, ML platforms, or consumer AI products—we want to talk to you.

The work: design and build secure, performant platform services for AI at scale; collaborate with infrastructure, product, design, and research teams; ship high-quality code that reaches hundreds of millions of users; move fast in a design-driven environment.

You: solid fundamentals in systems thinking and software engineering; fluent in Python, C#, C++, Java, JavaScript, or similar; shipped real products or systems people use; can communicate across technical and non-technical teams.

Compensation: Competitive with other frontier AI companies, commensurate with experience. Relocation available.

We're actively hiring and will respond to qualified applicants. Check https://microsoft.ai/careers for current openings, or email maiplatformjobs@microsoft.com if something specific doesn't fit the bill. Apply directly if genuinely interested in building the future of AI.

New grads: If you've had 2+ MAG7+ internships (or adjacent large scale experience) AND a strong transcript from your university. Use [NEW GRAD] in the subject line.

Freeform (http://freeform.co ) | Software Engineers | Full-time | Onsite | Hawthorne, CA (Los Angeles County)

Freeform is deploying metal 3D printing factories at global scale and setting a new frontier in manufacturing. With AI, GPUs, and FPGAs working in tandem, our system monitors and corrects every microsecond of the process, delivering a level of precision, speed, and quality that’s never been possible—until now. This isn’t just an improvement; it’s a leap forward in how complex metal parts are made, with the ability to revolutionize industries like aerospace, defense, automotive, energy, and beyond. We are backed by top VCs including NVIDIA’s NVentures, Founders Fund, and Threshold Ventures.

It’s a small, tight-knit team and you’d have the opportunity to own significant and impactful greenfield projects throughout the entire development lifecycle and much more. Our software team comes from the likes of Google, SpaceX, and Apple, and believe in taking a first principles approach to solving hard problems.

A glimpse into our software landscape - https://youtu.be/nFWQArUkd5I?si=mP17qdKbxvf8qpZN

Our feature in TechCrunch! https://techcrunch.com/2024/10/22/ex-spacex-engineers-land-1...

+ Principal Software Engineer - https://grnh.se/h4zevhq03us

+ Senior Software Engineer - https://grnh.se/n3heu99j3us

+ Senior Software Engineer, Factory Software C++ (Skyfall) - https://grnh.se/d5v28wv03us

+ Senior Software Engineer (Embedded) - https://grnh.se/hisej1hn3us

+ Senior Software Engineer (Edge Data & Telemetry) - https://grnh.se/7cqjij2q3us

+ Software Engineer (Edge Data & Telemetry) - https://grnh.se/7dw71wph3us

BREAKFAST | Senior Software Engineer | Brooklyn, NY | ONSITE | Full-time | $170 - $220k + profit share

We build kinetic sculptures that shouldn’t exist. A small team of designers and engineers, creating massive, data-driven installations that live in the world’s most iconic spaces.

This is for someone who’s looking for a totally different job. You want to work on seriously hard problems along a talented multidisciplinary team. Ready to jump both feet into new problem domains, figure out what needs to be done - and do it.

Here’s a behind-the-scenes of a large piece we did: https://youtu.be/Y-X82D1dBLc?si=Dj-5casrqoXP9wVy&t=228

The Tech & The Role:

You’ll be a senior voice on a tight team, touching every layer of the stack

- Systems/Backend: Managing Linux-based distributed systems that coordinate massive arrays of sensors and actuators. - Embedded/Firmware: Writing C/C++ for custom PCBs and motor controllers. - Languages: Primarily Python, JS, C, and C++. - Hard Problems: Real-time constraints, custom networking protocols, and high-reliability systems that have to run 24/7 in public spaces.

We're looking for:

- 10+ years of experience. We need a "tinkerer" who understands math/physics and isn't afraid to poke at hardware. - Someone who thrives on "mission-critical" pressure. When a sculpture goes up in a public plaza, it has to work. - Mentorship-minded. You’ll help shape the software culture as we grow.

We aren't a typical art studio, our tech is state-of-the-art. You’ll work alongside ME's and EE's in our Brooklyn studio to build things experienced by millions. The role is primarily onsite in Brooklyn, but some flexibility can be discussed.

Studio: https://breakfaststudio.com/

Apply: jobs+swe2026@breakfaststudio.com Include letter about you, a cv or resume and perhaps some project you'd like to share. Thanks!

Innolitics | Medical Device Engineers + Physician-Scientist (MD/PhD) | REMOTE (US) | Full-Time

Innolitics builds AI/ML software for medical devices — the kind that detects ear infections, tracks metastatic cancer, and plans radiation therapy. 60+ FDA clearances. We need engineers who want their work to matter. We're a remote-only firm (since 2012) that does engineering, regulatory, and cybersecurity under one roof. Our team includes MDs, PhDs, and software engineers. Clients range from Series A startups to large device companies. We're hiring for three roles:

1. Physician-Scientist (MD/PhD) — Biostatistics & AI Software Development MD + PhD in biostatistics, bioinformatics, epidemiology, or a related quantitative field. You'll design biostatistical plans for AI validation studies (MRMC, standalone, prospective), build production-grade statistical software and data pipelines, write FDA-facing statistical sections, and analyze large clinical imaging datasets. Fluent in Python and/or R. This is not a pure research role — you'll ship code that gets FDA-cleared and deployed in clinics.

2. Senior Web/Mobile Medical Device Engineer 5+ years SWE experience. 3+ years each in web and mobile. Fluent in TypeScript and Python. You'll build medical device software and produce FDA-facing technical documentation. Cross-functional role bridging engineering and regulatory teams.

3. Medical Device Software Engineer 3+ years SWE experience. Fluent in Python, C++, or TypeScript. Heavier emphasis on software development initially; you'll grow into regulatory documentation work over time. All roles involve writing production code for medical devices, authoring documentation for FDA submissions, and working directly with clients. No prior medical device experience required — we'll teach you. Why engineers stay here:

Agentic AI tools (Claude Code, etc.) are part of our workflow. We treat them as a impact multiplier, not a threat. ~1 hour of meetings/week for ICs. Flexible hours. 2 hours every Wednesday dedicated to learning ("10x Time"). Healthcare-only revenue. No debt. Never had a layoff. We pay $300 for take-home exercises because your time has value.

Stack: Python, TypeScript, C++, R, Django, React, TensorFlow, PyTorch, scikit-learn, Qt, Terraform.

Apply: https://innolitics.com/careers/

How we work (we publish our handbook): https://innolitics.com/about/handbook/

Upway | Software Engineers (All levels), Senior Product Designer, Senior Product Managers | Full-time | Paris (ONSITE)

We’re building the biggest bike shop in the world.

Upway is the leading marketplace for refurbished e-bikes across Europe and the United States.

In 3 years, we grew from 0 to $200M GMV. The tech team grew from a small senior core to ~12 engineers in 2025, and we plan to grow to ~30 engineers in 2026.

We also raised a $60M Series C at the end of last year to support the next phase of the company.

This is not a SaaS. We operate warehouses, handle real inventory, and build software that connects logistics, product, and marketplace dynamics at scale.

We work with a Shape Up–inspired methodology that gives teams real ownership: shaping problems, building solutions, shipping, and learning from real-world impact.

Stack: TypeScript | NestJS | React | Shopify | PostgreSQL | GCP

Learn more:

- Tech & Product subjects we’re working on: https://like-piper-15f.notion.site/tech

- Open roles: https://careers.upway.shop/

- Contact our tech recruiter: https://www.linkedin.com/in/maeg-horeau-28445b72/

Arenko (energy transition/batteries and renewables) | London, UK | 2x/week in office

We work on industrial/grid-scale batteries and other renewable generation: monitoring, managing and trading them on multiple energy markets. Batteries like these: https://en.wikipedia.org/wiki/Battery_energy_storage_system Everyone starting from the C-suite is passionate about addressing climate change and transitioning to renewable energy!

We're a small team of 7 backend engineers atm (other teams have Ops, FE and DS roles). We have paying customers and have been around for 10 years. Our current goal is to make the platform more scalable to deal with the customer growth and move to new markets. The biggest challenge is understanding how the various energy markets and energy storage in general work and then translating that to reliable working software.

We're currently looking for a few Senior Backend Engineers (Go), a Senior Data Engineer and a Senior Infrastructure Engineer. Our office is in London Blackfriars and most engineers come in about 2 days a week, but this is flexible.

Feel free to message me with any questions or apply directly:

https://arenko.bamboohr.com/careers?source=hn

https://arenko.group/careers/

Avanti | Gameplay Developer / Unreal Engine Developer | Stockholm, Sweden | Onsite/Hybrid | Full Time

Now we are looking for a Gameplay Developer / Unreal Engine Developer who wants to build the systems behind this experience.

This is not a feature-by-feature implementation role. It is a systems role.

You will work at the core of our real-time platform, designing and developing gameplay systems in Unreal Engine 5, using C++ and advanced Blueprints to create scalable, performance-optimized logic.

You will collaborate closely with animators and technical artists to ensure characters, props and animation behave seamlessly inside the engine.

The tech stack

    Unreal Engine 5
    C++
    Blueprint
    motion capture integration
    GCP

AAA background is not required. Experience building and shipping stable systems is.

You have solid experience working with Unreal Engine and feel comfortable in both C++ and Blueprint architecture. You understand gameplay systems, animation logic and performance constraints.

We value accountability, curiosity and clarity.

Apply here: https://nordictechjobs.com/jobs/UMWwUb5WaZ

Stellar Science | Hybrid (USA) Albuquerque NM, Washington DC (Tysons VA), Dayton OH | Full time, interns/co-ops | U.S. citizenship required | https://www.stellarscience.com

Company: We're a small scientific software development company that develops custom scientific and engineering analysis applications in domains including: space situational awareness (monitoring the locations, health and status of on-orbit satellites), image simulation, high power microwave systems, modeling and simulation, laser systems modeling, AI/ML including physics-informed neural networks (PINN), human body thermoregulation, computer vision and image processing, high performance computing (HPC), computer aided design (CAD), and more. All exciting applications and no CRUD. We emphasize high quality code and lightweight processes that free software engineers to be productive.

Experience: Except for interns, we currently require a Bachelors degree in physics, engineering, math, computer science, or a related field. Masters or PhD is a plus. (Roughly 25% of our staff have PhDs.)

Technologies: Lots of C++23, Qt 6.9, CMake, git, OpenGL, CUDA, Boost, Jenkins. Windows and Linux, msvc/gcc/clang/clangcl. AI/ML and analysis projects use Python and C++. Web projects use Java and Typescript/React.

Apply online: at https://www.stellarscience.com/careers/.

xAI | London, UK | ONSITE | Full-time | https://x.ai

Our London team is hiring two key roles:

Backend Engineer

Build and scale high-performance production systems powering grok.com and the xAI API. Strong Rust (or C++) required — distributed systems experience a big plus.

→ https://job-boards.greenhouse.io/xai/jobs/4991448007

Developer Experience Engineer

Make the xAI API the ultimate playground for builders and hackers. Craft world-class docs/examples/tools, and engage the dev community. Strong TypeScript full-stack + proven open-source/DevRel experience required.

→ https://job-boards.greenhouse.io/xai/jobs/4985451007

Small, high-ownership team. Competitive comp, meaningful equity, full benefits. Visa sponsorship available. High-agency builders excited about frontier AI — apply above!

CodSpeed | Multiple Positions | On-site (Paris) / Remote (Europe) | Full-time | https://codspeed.io

We’re building the continuous performance optimization platform. We help engineering teams catch performance regressions before they ship, with sub-1% measurement variance. We’re already trusted by teams at Cloudflare, Vercel, Mozilla, Pydantic, and Astral (Ruff, uv).

We’re a small, deeply technical team looking for engineers who want real ownership and the chance to ship end-to-end. Competitive salary, stock options, generous PTO.

Senior Systems Engineer: CPU simulation tooling, language runtime internals (CPython, V8), kernel I/O emulation. C/C++/Rust/Zig.

Senior Full-stack Engineer: React/Next.js, Node.js/TypeScript/GraphQL, GitHub/GitLab integrations, Rust data pipelines.

Senior/Lead AI Engineer: Agent layer, eval methodology, context pipelines, model selection. Python/FastAPI.

Graphic/UI Designer: Visual identity and product experience for a developer tool.

More details at https://careers.codspeed.io. Apply at careers@codspeed.io

CrossnoKaye | Sr. Software Engineer in Test | REMOTE (US)

Hi HN! CrossnoKaye is a Series C startup tackling climate change by transforming the heavy industrial sector. Our platform uses real-time optimization, advanced modeling, and modern cloud infrastructure to deliver 40% average energy savings and megaton-scale emissions cuts across industrial facilities. https://crossnokaye.com/

We’re hiring for a Sr. Software Engineer in Test to join our Platform team. We’re looking for a hands-on engineer who loves Golang, backend frameworks, and automated testing. You’ll play a key role in shaping the architecture, testability, and quality of our platform. This is a hands-on senior IC role with strong ownership. Must have strong proficiency in Go.

Interested? Email our team: careers@crossnokaye.com -- Please include a resume and the title of the role within the subject line.

Thank you & I look forward to hearing from you!

Proton VPN (https://protonvpn.com/) | Senior Performance Engineer | Barcelona, Spain or Geneva, Switzerland | ONSITE

Proton VPN enables millions of people to connect securely and privately, even in places where the internet is restricted or unreliable. Delivering that experience means our service must perform flawlessly under highly variable, real-world conditions.

We are looking for a Senior Performance Engineer to lead our efforts in making Proton VPN the fastest, most resilient, and most reliable VPN service in the world.

You will define and drive the measurement, analysis, and optimization of Proton VPN’s end-to-end performance, across clients, platforms, and global infrastructure. You’ll help ensure that every connection is fast, stable, and private, regardless of where the user is or what network they’re on.

We're looking for candidates with experience in system-level development (e.g. C or C++ or Rust), and network engineering (experience working with UDP/TCP and VPN protocols).

Apply at: https://job-boards.eu.greenhouse.io/proton/jobs/4725157101 (see also: https://proton.me/careers)