Karma (pre-seed) | Senior Backend / Full-Stack Engineer (Founding Team) | London, UK | ONSITE (3-5 days London) | £75-100k base + meaningful equity | careers@karmapt.com

We're a small London team, 2+ years in, building a real-time consumer platform powered by AI in a category that doesn't exist yet, going after a problem worth solving. Free for users, brand-funded on the commercial side. Working iOS prototype, validated UX, advisory board across enterprise tech and behavioural science, alpha launches lined up for later in 2026.

The founding tech team is already in place across iOS, Flutter, AI/ML, and product design, with backgrounds across agentic AI, consumer fintech, and mobile at scale. The seat we're hiring for is the founding backend / full-stack engineer who'll own the architecture. APIs, data layer, real-time systems, cloud infrastructure. You'll design it from scratch alongside the rest of the team, built for consumer scale from day one.

What we're looking for:

- Built and scaled backends for consumer products under real load. Social, marketplace, or community experience a strong plus.

- Fluent in Python, Go, Node, or similar. Strong opinions on API design, microservices, and data modelling.

- Comfortable with event-driven architectures, real-time systems, and AWS or GCP at production scale.

- Bonus: ad-serving infrastructure, partner APIs, rewards/loyalty systems.

- UK-based already (no net-new visa sponsorship for this role), with us in our London office most days. We're a small team that works best in the room together.

We're vague on the concept for stealth reasons. Happy to take you through our prototype on a call.

Email careers@karmapt.com and mention Hacker News in your note. I'll come back quickly.

Normcore.io | Head of Strategic Finance | Full-time | $100-140K USD | Remote PT/ET Hours

I'm the founder of Normcore.io, an autoscaling game server hosting service and Unity plugin that includes all of the pieces you need to create a multiplayer game. We launched a few years ago and have hosted over 1 billion multiplayer games since launch. We also make our own VR titles that are built on top of our own networking tech: https://www.youtube.com/watch?v=djsPTbs7R_w

I'm looking to hire a Head of Strategic Finance. We're looking for someone to model our revenue streams, create financial projections for the company, and help design the monetization strategy for our titles. We make heavy use of Claude for Excel and Claude Code to create tools to track popular titles, store charts, basically any data we can use to understand the gaming market. We then use that data to determine the direction for the company.

Reasons you'd love working with us:

* Work with a small, focused, and extremely talented team.

* Fully remote job with flexible working hours and vacation (Our whole team is remote too)

* High work satisfaction, own entire features, and work on an SDK that’s already used by 100,000+ developers.

If you're interested, please send an email to careers@normalvr.com with your LinkedIn and a few sentences about why you would be a good fit for the role. Blank emails with resumés or generic applications that don't follow these instructions will be ignored.

Two Six Technologies | Technical Lead, Principal, and Senior Principal Vulnerability Researcher | Arlington, VA | ONSITE | Full Time | https://job-boards.greenhouse.io/twosixtechnologies/jobs/589... Two Six Technologies is seeking highly experienced Technical Leads, Principals, and Senior Principal Vulnerability Researchers to drive our in-depth reverse engineering and exploit development efforts. In these advanced roles, you will own the technical direction of critical projects and transition research findings into operational capabilities. We are looking for elite embedded security researchers to tackle complex challenges in firmware and hardware reverse engineering, as well as Linux/UNIX kernel development. You should have a strong track record of technical leadership or principal-level contributions, along with a preference for an active TS clearance and the ability to obtain SCI at a minimum.

If you are interested in pushing the boundaries of vulnerability research and embedded security, please apply via the link above or reach out directly to our team at recruiting@twosixtech.com.

CodeWeavers | St Paul, MN, USA | Full Time | REMOTE | Wine and General Open Source Developers | C-language systems programming

https://www.codeweavers.com/about/jobs

CodeWeavers needs new, full-time developers to improve Wine's ability to run games and other types of software and integrate well with the native operating system and other system components. Positions are available to work on a variety of Wine-based software, including CodeWeavers's own CrossOver product; the Proton project for Valve Software; and projects for other clients and software internal to CodeWeavers.

We are hiring remote programmers, US or international, as well as workers local to Saint Paul, Minnesota. We will consider relocation, if desired, on a case-by-case basis. Please see link above for information, benefits, requirements, and how to apply.

Please direct any questions to the email address on our Jobs page.

UpMetrics | Full Stack Software Engineer | Hybrid (Sacramento, CA) | Full Time | $145k-$170k

UpMetrics provides an impact reporting platform and expert services designed to help mission-driven organizations and funders leverage data to accelerate social change. By combining innovative technology with community building, we empower partners to collect insights, secure capital, and share compelling stories to achieve their goals.

We’re looking for a Full Stack Engineer to join our mission-driven team and help build the technology that powers social impact. This role is primarily remote with occasional meetups in Sacramento with our Director of Engineering.

Stack: Ruby (flexible if you know Python), JavaScript/TypeScript, Vue (or React, Svelte)

Looking for: 6+ YOE, startup experience

Check out the full job description & apply here: https://jobs.lever.co/UpMetrics/62b78791-e881-44c7-bf21-c82b...

(Applicants must be authorized to work in the United States. UpMetrics is unable to sponsor or take over sponsorship of employment visas at this time.)

Engineering Square | AI Engineer | Bay Area, CA | ONSITE | Full-Time

We're hiring an AI Engineer to build and ship production AI systems - not research prototypes. Startup experience is a must: we want someone who has shipped fast in a small team, owned systems end-to-end, and is comfortable with ambiguity. Big-company-only resumes won't be a fit.

You will own: - RAG pipelines and agentic workflows (end-to-end accuracy) - GPU-optimized model deployment (Trident-style architecture) - Production MLOps: distillation, fine-tuning, training orchestration - Data modeling for AI persona capabilities - The infra around it: Docker, CI/CD, logging, monitoring, observability

You should have: - 3-12 years shipping AI/ML in production (notebooks do not count) - Time at a startup or scale-up where you owned what you built - Strong Python; bonus for C++/Java/C# in performance-critical paths - Hands-on with RAG, MLOps tooling, and GPU deployment at scale

W2 full-time. Must be authorized to work in the US. No remote, no C2C.

Apply: saikumar@engineeringsquare.us (subject: "AI Engineer - [Your Name]")

Burnin (London or NYC) | Founding Research Scientist + Founding Engineering Lead | Hybrid (Some on-site) | Full-time

We are building the trust stack for AI code generation, targeted at high-stakes computing where wrong numbers cost real money: a statically typed functional language designed for coding models, a compiler whose guarantees double as audit-grade trust infrastructure, and a coding model fine-tuned on the language with compiler fitness as the training signal. Language and model are co-designed.

Small team out of PyTorch, FAIR, and Meta. Strong institutional VC support from our pre-seed; active investor interest heading into seed.

Founding Research Scientist: own the agenda across the language and the model. Type system design, compiler analyses that produce useful fitness gradients, and fine-tuning open-weight coding models on a language with no pretraining footprint. Publish in PL and ML venues. Strongest fits cross between machine learning, programming languages, and formal methods. PhD preferred, equivalent output equally fine. Stack is Rust, Lean 4, Python.

Founding Engineering Lead: own engineering across compiler internals, language runtime, GPU backends, notebook and library tooling, and the AI infrastructure around training, evaluation, model release, and likely public inference. We already support x86 and ARM, CUDA and AMD, macOS and Linux, and the matrix grows. Real feel for statically typed functional programming expected; the kind of engineer who picks up Lean or Haskell on a weekend because they wanted to. Have led engineering before, formally or not. Stack is mostly Rust with Python where it earns its place, primarily on AWS.

Both roles: comfortable with early-stage ambiguity, define your own roadmap, defend it with evidence.

Apply: RS: https://wellfound.com/l/2Carrr Eng Lead: https://wellfound.com/l/2CewDC

Socials: YT: https://www.youtube.com/channel/UC4DLS_emqwKXO7A9qaOtxlw SS: https://burninai.substack.com/

Formal | Multiple Positions | REMOTE | Full-Time | $100k - $250k + Equity

We're building a new computing stack with formally verified data, memory, and resource isolation between executions for instant, truly elastic global compute. This includes designing and building a production language in a way that's never been done before, with complete, mechanized formal specifications and a certifying compiler from the start. Our immediate goals include an alternative to eBPF and building the world's first serverless networking infrastructure.

We are VC funded with runway for multiple years. The team is composed of PhDs from Stanford, UW, OSU, and Brown, advised by professors from MIT and UWaterloo.

We are currently hiring for the following positions:

- [1] Staff Software Engineer: Compilers, Programming Languages, and Verification ($175k - $250k + ≥ 0.4%)

- [2] Formal Verification Engineer: Formal Methods and Programming Languages ($120k - $200k + ≥ 0.2%)

- [3] Software Engineer: Compilers and Programming Languages ($100k - $175k + ≥ 0.1%)

- [4] Formal Methods PhD Intern: Formal Methods and Programming Languages ($10k / month)

Please see [5] for general information. Apply via our job board [6].

[0] https://formalstack.com

[1] https://formalstack.com/jobs/05-2026/staff-software-engineer...

[2] https://formalstack.com/jobs/05-2026/formal-verification-eng...

[3] https://formalstack.com/jobs/05-2026/software-engineer-v.pdf

[4] https://formalstack.com/jobs/05-2026/formal-methods-phd-inte...

[5] https://formalstack.com/jobs/info.pdf

[6] https://jobs.gem.com/formal

Entex | Full-stack Dev | Remote (Worldwide) | 60 to 100 %

entex is a small established Swiss IT service provider. We offer some of the classics: IT support, infrastructure, web development and high-end security cameras. We deal with a lot of “boring” tech and it’s great! (Well, mostly great!)

After a recent change in ownership, we are looking to grow, reinforce the existing team and expand our service offering.

Role: Full-stack Developer (Web), 60 to 100%, more details: https://www.entex.ch/staticfiles/26-04-28-FSD.pdf

Please send your application to jobs (at) entex (dot) ch and ideally include a range of expected compensation.

Loophole Labs | Senior Systems Engineer | REMOTE (Americas & Europe) | $150k–195k USD + equity | Go, Zig, Rust, C, eBPF, CRIU, Kubernetes

We make Architect: a Kubernetes runtime that hibernates idle pods in place and wakes them in 50ms with TCP connections intact. Five engineers. You'd be the 6th.

If tracing an x86 instruction in the morning and hunting a control-plane race in the afternoon both sound fun, and you insist on measuring rather than guessing, this is the job.

Customers run Architect for workloads where cold starts hurt: real-time voice & video AI agents, long-warming JVM apps, stateful data services that can't be rescheduled cheaply. 1.0 shipped Q1 2026; you'd join mid-way through 2.0. Seed-stage, VC-funded, a few years of runway. Fully distributed across the Americas and Europe.

What you'd work on:

- Hibernation surface: containerd shims and CRUISE, our Zig-native CRIU replacement.

- Control plane: per-node DaemonSet streaming checkpoints; admission controller resizing hibernated pods in place.

- Networking and migration: eBPF/XDP at line rate; cross-node live migration to production; cross-cloud next.

You're a senior generalist. Years across the stack: assembly to frontends, hardware-near, comfortable in x86. Tests ship with the code, decisions get worked out in writing, and you measure rather than guess. Strong in Go; willing to use Zig, Rust, or C.

Bonus: eBPF/XDP, CRIU, Linux kernel internals, containerd, gVisor, live migration, or public writing in kernel/container/eBPF land. Strong systems depth and the willingness to pick up the rest is enough on its own.

Apply: https://loopholelabs.io/careers - we respond within the week (typically a few days).

Shepherd | ONSITE | San Francisco, CA

At Shepherd, we're pursuing the most ambitious technical vision in commercial insurance: fully autonomous underwriting. Shepherd is an AI-native commercial insurance platform transforming how high-hazard industries get covered.

The infrastructure behind the AI boom (data centers, semiconductor fabs, renewable energy assets) has to be built and insured, but traditional carriers weren't built for this speed. We built Shepherd to solve that.

We just recently announced our $42M Series B! That brings our total funding to over $60M — led by Intact Private Capital, the investment arm of one of the largest insurers in the world. Intact is not only our lead investor but also a carrier partner, a testament to the confidence the incumbent industry has in what we're building.

(Hear from our CEO here: https://www.shepherdinsurance.com/blog/behind-our-42m-series...)

(Hear from our CTO here: https://www.shepherdinsurance.com/blog/the-road-to-autonomou...)

This year, we’re growing our engineering team from 25 to 40. We’re looking for product-minded engineers to join us as we continue to scale! We’re looking for someone who thrives on ownership, drives results, and cares deeply about both technical excellence and customer impact.

We’re hiring various mid-level, senior-level and staff-level engineers. See some of our openings below:

* Full Stack - Job Posting: https://jobs.ashbyhq.com/shepherd/c4081c3d-a79b-4ac9-aa19-78...

* Backend - Job Posting: https://jobs.ashbyhq.com/shepherd/395f4b75-cf05-4581-8408-8f...

* Founding Machine Learning Engineer - Job Posting: https://jobs.ashbyhq.com/shepherd/797316b4-bdcc-4c0c-8bc2-46...

* Applied AI Engineer - Job Posting: https://jobs.ashbyhq.com/shepherd/26959124-aab2-446e-aa4d-72...

Our stack includes: Typescript, React, Next.js, GraphQL w/ Apollo, Node.js, Postgres & Redis

Apply here: https://shepherdinsurance.com/careers

* In the form, be sure to mention that you heard about this opportunity via Hacker News. If you want to read more about our team and culture, check out our blog: https://shepherdinsurance.com/blog

BIT Capital | Principal Engineer (Data & Platform) | Berlin, Germany | ONSITE (2 days/week) | Full-time

Looking for experienced engineers to build and scale infrastructure and data platforms for a Berlin asset management fund. We are betting big on AI to drive investment returns and build the best infrastructure to support our high alpha targets (track record >30% p.a. since inception; https://bitcap.com/en/bit-global-technology-opportunities-ai...).

You'll design large-scale data pipelines, evolve our lakehouse architecture, strengthen data quality and observability, and build infrastructure for AI/LLM workflows (agentic scaffolding, RAG, LLMOps, AI for engineering). We are looking for a hands-on technical leader, that is steering initiatives end-to-end while staying deep in implementation.

We have our roots in tech entrepreneurship (Jan Beckers), and this mindset still dominates our work culture, even as a regulated financial institution. We are a team of ~40 with a flat hierarchy, hands-on leadership, fast-paced decisions, and a little nerdy culture as people are actually passionate about their work. Stack: AWS, Databricks/Spark, Python, PostgreSQL, Agentic AI.

If the complexity of financial markets excites you as much as the complexity of distributed systems, you'll love it here. Competitive comp, relocation & visa support, stellar team.

Apply at: https://bitcap.jobs.personio.com/job/1833794

We The Flywheel | Remote (Worldwide) / Ho Chi Minh City (Hybrid) | Part-time | https://wetheflywheel.com

We are a global media network, digital consultancy, and product studio focused on helping companies grow through technology and reach audiences at scale.

We are hiring for:

Growth Marketer (Entry-level, Remote, Worldwide) https://wetheflywheel.com/en/careers/growth-marketer-remote/

Growth Marketer (Entry-level, Ho Chi Minh City, Hybrid) https://wetheflywheel.com/en/careers/growth-marketer-saigon/

Digital PR & Media Outreach (Mid-level, Remote, Worldwide) https://wetheflywheel.com/en/careers/digital-pr-media-outrea...

Product Manager (Mid-level, Remote, Worldwide) https://wetheflywheel.com/en/careers/product-manager-remote/

Product Manager (Mid-level, Ho Chi Minh City, Hybrid) https://wetheflywheel.com/en/careers/product-manager-saigon/

Brand Identity & Product Designer (Intermediate Level, Remote, Worldwide) https://wetheflywheel.com/en/careers/brand-product-designer/

INDATA | AI Development Associate | REMOTE (US) or San Diego | FULL-TIME | $95,000–$115,000

We're hiring a junior dev who is genuinely AI-native — your primary tool is Claude Code or Cursor, not your own typing. You'll extend our agentic AI copilot embedded in Architect AI, our portfolio-management web app: text-to-SQL over financial schemas (holdings, transactions, performance), RAG over our internal docs, action tools, deploy and operate the system on Linux + Docker.

Stack: Python/FastAPI, LangGraph, LangSmith, React/TS, SQL Server, Qdrant, Redis, Anthropic + OpenAI + Azure AI.

Required: real SQL chops, ability to read Python and judge AI-generated code, a public project we can look at where you actually used Claude Code / Cursor / Copilot to ship something. 0–2 years professional experience. Recent grads welcome. You'll report directly to the Director of PM who built the system.

Apply: https://forms.microsoft.com/Pages/ResponsePage.aspx?id=-HA4S...

(5-min pre-screen form, includes a quick SQL question — please don't skip it)

NetBird | Berlin, Germany | ONSITE & Remote for some roles | Full-time | https://netbird.io

We build open source secure remote access for teams and infrastructure. 25k+ stars, Series A. Our mission: make secure connectivity simple and accessible for everyone.

Looking for people excited about the product, startup pace, and growth. Actively hiring for:

- Senior Backend Engineer (Go, networking, distributed systems) (Onsite)

- Staff Software Engineer (Go, systems design, scaling)

- Engineering Manager (leading teams, dev productivity, scaling eng org, IC is a plus)

- Head of Growth (PLG, dev tools, OS motion, conversions and funnels)

- Product Marketer (IT/dev audience, positioning, content & GTM strategy)

- Solutions Engineer (customer-facing, highly technical, bridge product & users)

You’ll be working on modern networking infrastructure and helping shape both the product and the company.

Please email me at: veronica.external@netbird.io and connect with me on Linkedin (if you have) at https://www.linkedin.com/in/veronicaroman718/

We are actively hiring and will respond to all applicants.

To see more roles not listed here: https://careers.netbird.io/

Pathos AI | Senior Software / AI Engineer | NYC (hybrid, 3-4 days onsite) | Full-time | $180-200K + equity | VISA

Pathos is an oncology biotech building AI as the operating system for drug development. We have: - 200+ petabytes of multimodal patient data linked to outcomes - The largest foundation model in oncology (in development) - Backing to build a generational company - Founded by Eric Lefkofsky (Tempus) and Ryan Fukushima

This role is 0→1 product work. You'll build: - AI agents and copilots for internal teams (BD, clinical, computational biology, lab) - MCP-style servers so agents can safely interact with internal systems - Data pipelines into a governed warehouse / knowledge graph

Looking for senior software/ML engineers who: - Have 4+ years shipping user-facing systems - Are fluent in Python + TypeScript/JavaScript, comfortable full-stack - Have built LLM-powered workflows (OpenAI API or similar) - Have production experience with APIs, eventing, data engineering (GCP/BigQuery a plus) - Bonus: prior agent/retrieval/ML infra work, or experience in regulated clinical environments

Hybrid in NYC (3-4 days onsite). $180-200K base + equity (3-yr vest, no liquidity until exit). Visa support available.

Apply: email chris.poshka+hn@pathos.com.