Rhythm | Chicago / Remote (Ok for exceptional candidates) | Senior ML Engineer | Full-time

We are a KP-backed startup that is solving sleep apnea for 1bn people. We are looking for an exceptional ML/AI engineer to help build human simulators.

Our team is full of world class technical talent and this is a once in a lifetime opportunity to meaningfully improve the daily lives of people around the world.

Please email us a proof of any one exceptional AI project at kanishk [at] rhythmpap [dot] com.

Bonus points if you've had to titrate a CPAP before

Tech Mahindra | Full-time, all levels | India, USA, Canada, Mexico | techmahindra.com

Tech Mahindra’s Cloud Advisory division is hiring engineers (4+YoE) and cloud solution architects (8+YoE) to help enterprises modernize and operate at scale on AWS, Azure, and GCP. We value folks with a strong software development background who have grown into cloud and platform engineering roles. Our work spans cloud application modernization, platform engineering, DevOps, SRE, SecOps, and FinOps. Any experience with using AI to improve cloud platforms, DevOps or operations is a plus.

We’re hiring across all levels and geographies (India, Mexico, Canada, USA).

Roles include: Cloud Engineers, Platform/DevOps/SRE, Cloud Architects, DevSecOps, Tech Leads, and Engineering Managers.

Apply: Send your resume to cprabala@techmahindra.com (mention HN – Cloud Advisory).

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

Stream (https://getstream.io/) | Staff Database Reliability Engineer - PostgreSQL | Amsterdam or Remote (Europe) | Full-time | Visa Sponsorship

Stream runs 35–40 PostgreSQL databases (largest: 15TB) behind high-write, high-concurrency APIs serving billions of requests a month. We're migrating from AWS RDS to self-hosted Postgres on Kubernetes and need someone who has owned this end-to-end: query plans, vacuum and bloat, replication, backup, HA, sharding.

Required: deep Postgres internals (MVCC, the query planner, autovacuum), real sharding experience beyond table partitioning, self-managed databases in production, and enough engineering depth to work directly with application teams on access patterns.

Explicit non-goals: RDS/Aurora-only backgrounds, analytics/data-warehouse experience, or DBAs who don't code.

Strong plus: CloudNativePG, Kubeblocks, logical replication, CockroachDB experience.

Apply here: https://jobs.ashbyhq.com/stream/44056edb-2489-4187-97ff-afe0...

Senior Software Engineer| New York City | Fintech

Tapitab is a stealth-mode fintech startup building a proprietary self-learning customer intelligence platform for the US hospitality industry. We are patent-pending across multiple core innovations and are moving fast toward launch.

We are looking for a Senior Software Developer to join our technical team and take full ownership of building our POS software layer — including payment integration, tab origination and settlement flows, and Android application development on a handheld payment device.

What We Need:

• 5+ years of Android development experience (Java or Kotlin) • Hands-on payment processor API integration — Stripe, Shift4, Fiserv, Worldpay, Finix, or equivalent • Deep knowledge of EMV, NFC, and contactless payment standards • Proven experience building POS software for bars, restaurants - hospitality industry • Prior work with leading POS system providers is a strong plus • Bachelor’s degree in Computer Science, Engineering, or a related field, or equivalent

What We Offer:

• Ground-floor opportunity at a stealth-mode startup with genuinely novel, patent-pending technology • Full contract basis at a competitive rate — OR — salary + equity for the right candidate • Work directly with the founding team on a greenfield architecture — no legacy code • Location: ONSITE - New York City

This is not a general dev role. We need someone who has built payment flows before and understands the hospitality POS environment from the inside.

Interested? Send your resume and a brief note on your POS and payments experience to:

info@tapitab.com

Senior Python Backend Engineer | REMOTE (EMEA/APAC)

We’re looking for Python backend engineers to work on a trustless supercluster of performance-proofed GPU-enabled sandboxed docker container runners controlled by truly decentralized algorithms (not just PAXOS or RAFT).

Wow, that was a mouthful...

If you found it interesting, join Reef Technologies and tackle complex technical challenges like this on your own terms:

- Contribute from wherever you like, we are fully remote - Set your own time commitment, as long as it’s at least 30h per week - See how we work in our handbook: github.com/reef-technologies/handbook - Influence the way we operate through our Sociocracy 3.0 decision-making process

Salary on a B2B contract:

- 45-70 USD or 180-280 PLN per hour - Flexible work schedule (as measured with a time tracker) - We automatically adjust rates based on inflation twice a year

We're looking for someone with 5+ years of programming experience, including at least a year with Python (including opensource and significant personal projects).

So, what do you think? You don't even need a CV; just go to https://careers.reef.pl/?utm_source=hackernews and shoot a few quick commands to apply.

Contact: hiring@reef.pl Web: https://reef-technologies.com/

Piramidal | Senior Backend, Infra, Frontend Engineers | NYC onsite | Full-time

Piramidal is looking for senior software engineers - frontend, backend, and infra - who are excited about solving difficult problems at the boundary of foundational AI and neuroscience. We work on real-time monitoring of neurological data to help clinicians better treat their patients.

Our core backend and infra stack is Python, Go, and Terraform deployed to various cloud and on-prem, while our frontend stack is React and TypeScript. Bonus points for either: standing up and maintaining reliable streaming systems with a production/ops mindset; or building smooth, data-intensive React UIs with modern plotting/visualization libraries.

You would take an active role in architecture and design, implementation, and hiring from your early days, and will have the opportunity to have ownership commensurate to your capacity and interests.

Apply for jobs here: https://job-boards.greenhouse.io/piramidalinc

Puntt AI | SF Hybrid | Forward Deployed Engineers | Founding Sr. Applied AI Engineers | Salary: $180,000 - $210,000 USD + equity, benefits and unlimited PTO

One of our customers has thousands of packaging assets spread across dozens of markets, languages, regulations, and brand standards.

Every change needs to be reviewed before launch. Humans currently do most of that work.

We are automating it. The challenge isn't generating text. The challenge is building systems that can be wrong almost never.

We're looking for:

- Forward Deployed Engineers who enjoy sitting with customers, figuring out what's actually broken, and building solutions faster than a roadmap ever could.

- Applied AI Engineers who obsess over retrieval, evaluation, orchestration, reliability, and all the ways AI systems fail in production.

Small team. Real customers. Revenue. Lots of difficult edge cases.

Please reach out directly if interested: linkedin.com/in/christinakayler

Anyfin | Full-Stack, Backend (Go), Data Engineer | Stockholm, Sweden | ONSITE 3 days/week | Full-time | Relocation + visa sponsorship

What happens when you get a number wrong?

In most systems, you log an error and move on. At Anyfin, a wrong number is someone's loan application.

We're a profitable Swedish fintech that helps people refinance expensive consumer loans at better rates. Small team, regulated industry, which sounds like a recipe for slow, cautious engineering. It's the opposite. The regulation sets the floor, not the ceiling. Above that floor, we experiment, ship, break, learn, and ship again.

We're building real-time credit decisions using ML models on GKE, Go and Python on the decision layer, TypeScript/Node.js on the API, React on the frontend, BigQuery and dbt for data. Interesting stack, interesting problems, and because we're small, you're close to all of it.

Our co-founder Sven is back leading eng and hiring directly. No recruiter chain, no committee. Short feedback loops. Real ownership. No one to hide behind.

Roles: Senior Backend · Full-Stack · Cloud · Data Engineer

https://anyfin.info/hackernews

Flow Traders | Research Engineer | Hong Kong/ London (onsite) | 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://lnkd.in/dWhh_m28

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

LiveKit|http://livekit.io/| VoiceAI | webRTC | Remote | Full Time LiveKit is building the infrastructure layer for the voice-driven era of computing. Our platform gives developers everything they need to build, test, deploy, scale, and observe agents in production.

Hiring:

>> Staff Rust SDK Engineer: https://jobs.ashbyhq.com/livekit/a1d10340-7cd9-4029-9a56-139...

>> Staff Security Engineer: https://jobs.ashbyhq.com/livekit/efc06ff8-37c4-473e-8de8-bbb...

>> Sr Software Engineer, Agent Platform: https://jobs.ashbyhq.com/livekit/f152aa9f-981c-4661-99d3-683...

>> Developer Success Engineer: https://jobs.ashbyhq.com/livekit/fdff28df-2245-43c1-bb09-430...

>> Sr Software Engineer, Telephony: https://jobs.ashbyhq.com/livekit/d9a2f119-0c83-4b39-a7de-7d2...

Co-founders: Russ d'Sa (CEO/Cofounder) https://www.linkedin.com/in/russelldsa/ & David Zhao (CTO/Cofounder) https://www.linkedin.com/in/davidzhao/

Check out our blog: https://livekit.com/blog

Our other roles: https://livekit.io/careers?utm_source=1bpyr8q375

CO-Ver | Fullstack & Senior Fullstack SWE | Remote US | $125k-$175k DOE + Equity | 1099 Contract-to-Hire | Self-funded

GCs routinely overbill 10-15% on change orders, and owners have no systematic way to catch it. CO-Ver is building software to help owners and developers review, validate, and challenge construction change orders before they pay them.

The product combines document ingestion, scope/cost comparison, estimate review workflows, and LLM-assisted analysis with human estimators in the loop. MVP is nearing completion. We're targeting production by mid-July, self-funded, intentionally small, and working directly with customers in a painful, expensive, and underserved market. You'll work with the founders and fractional CTO, have a real voice in product and architecture decisions, and receive early-stage equity.

Open roles: Fullstack SWE ($125k-$155k): 3+ years, strong TypeScript, React/Next.js, solid data modeling, interest in LLM-assisted workflows

Senior Fullstack SWE ($150k-$175k): 5+ years, deep TypeScript, production Next.js/multi-tenant SaaS/LLM features, comfortable owning architecture decisions

Nice to have: Convex, Clerk, Tailwind v4, PDF pipelines, construction domain knowledge

Stack: Next.js · React 19 · TypeScript · Convex · Clerk · Tailwind v4 · Anthropic API · Vercel · GitHub Actions

Email recruiting@co-ver.com with [hn] in the subject. Thank you!

Otherling | Senior Full-Stack Software Engineer | Hybrid NYC or LA | Full Time

Otherling is a fashion e-commerce startup helping consumers discover emerging luxury brands. We're hiring a Senior Full-Stack Engineer to design, build, and maintain our platform end-to-end.

REQUIREMENTS - 4+ years in software development (CS degree or equivalent) - React, Next.js, Tailwind CSS - Python or Node.js - SQL/NoSQL/Postgres and data modeling - REST and/or GraphQL APIs - Docker and AWS (ECS, Cognito, S3, Lambda, RDS) - Shopify platform and API development - Plus: startup or luxury-fashion interest

APPLY Email otherling@vornoy.com, subject 'Otherling dev'. Include your resume and location (New York or Los Angeles).

Peachtree Infrastructure | Full Stack Dev, Data Engineer, Salesforce Admin/Dev | REMOTE (US) Series A renewable-energy developer (solar, storage, efficiency, grid services) building the software and data backbone for our energy assets. Small team, lots of ownership. Stack: Python/Flask, Node, Svelte, GCP (Cloud Run, BigQuery, Cloud SQL/AlloyDB), Salesforce. US (CO, GA a plus), full remote.

- Full Stack Dev (mid, 4-7 yrs) - $120k-$145k Features end-to-end across Python/Node + Svelte on GCP, SQL/Postgres, BigQuery, REST, Cloud Run

- Data Engineer / Data-focused Full Stack (5+ yrs) - $150k-$180k Own our IoT data platform: ingestion into BigQuery (batch + near-real-time), time-series modeling, operational Postgres, full stack interfaces. Strong BigQuery + SQL, ETL/ELT

- Salesforce Admin/Dev (mid) - $110k-$140k, Own org health + build real solutions (Flows, Apex, LWC, custom objects, integrations) for our deal lifecycle & project management, Platform Dev I a plus

W-2, full benefits, Apply: hiring@peachtreeinfra.com

Deep Core Technology | Founding Engineer | REMOTE (MUST LIVE IN CANADA) | Full Time | Salary: $105,000 - $125,000 CAD + equity

Company: We’re building a geologic modelling software, based on reasoning, to help mining and mineral exploration companies work faster. Our goal is to create a way to enable open-ended, interpretive geologic problem solving to be done programmatically, changing the way to explore for hard rock and critical minerals. Currently in active fundraising.

Role: You are the founding engineer on the team, joining co-founder (Neil, CEO) and myself (Jeff, CTO) as first employee. You’ll have a deep influence over systems and architecture. You will have ownership through the entire stack from the database, through geostatistical backend services, through 3D rendering on the client side.

Work rooted in agentic systems, so an understanding of the internals of things like Claude Code, and a broader understanding of orchestrating agents to complete complex discrete tasks is important.

You:

- Fluent in Typescript, Python, and framework/tooling agnostic (Currently using things like NextJS, Supabase, Cesium)

- Eager to learn about mining domain knowledge around the software.

- Ownership of the codebase, and the systems that support the software (project management, CI/CD, monitoring, etc.)

- Strong engineering fundamentals around architecture, systems and security.

- Open to doing a yearly month abroad with Neil and I. Last year, it was Oaxaca, Mexico.

Apply: Shoot me an email at jeff@deepcoretech.com with a resume, and a short blurb about yourself. If you include a 1 minute video/Loom, I'd love to see it. Must be eligible to work in Canada without a VISA requirement. We are located in Squamish, BC.

https://www.deepcoretech.com

Wand | Senior Windows C++ Engineer | REMOTE (US Eastern timezone overlap required) | Full-time

Wand (40M+ gamers) builds the augmentation and intelligence layer for PC gaming — real-time game-state reading powering a unified ecosystem across desktop, web, and native in-game overlays. Contextual help, interactive maps, and video clipping delivered exactly when a player needs it, without alt-tabbing out of the game.

We're hiring a senior IC to own meaningful parts of the native infrastructure underneath all of that. This is platform-team work at the seam between Windows, third-party game engines, and our product. You'll make architecture calls the rest of engineering lives with for years, and you'll measure success by what other teams shipped on top of your foundation — not by what you personally wrote. Recently shipped: a plugin system for safe in-process extensions; current work includes a Lua scripting layer on top of it.

What we're looking for: - 7+ years C++, meaningful time on tools/engines/platform systems where your users were other engineers - Deep Windows native: Win32/64, DLL lifecycles, hooking, IPC, process/thread management, WinDbg/Process Monitor - Strong concurrent programming — you spot races and ordering bugs in review without a checklist - Plugin/extensibility experience: you've designed an interface someone else built on, and lived with the result - Outcome-oriented, low-ego

Bonus: Unreal/Unity internals, full-stack TS/Electron down to C++, scripting/SDK layer (Lua/AngelScript/DSL), OBS or video capture internals, gRPC/Protobuf/FlatBuffers.

Fully remote, competitive comp + equity.

Apply: https://jobs.ashbyhq.com/wand?utm_source=kY1r05Q4Go

Espresso AI | Staff ML, Staff Infra, FDE | Brooklyn or San Francisco | Full time We're using LLMs to build neural optimizers, neural scheduling systems, and neural workload tuners. (If you're ex-Google, you can think of it like Borg powered by LLMs.)

Today we use ML to make data warehouses and spark jobs more efficient. We're hiring staff ML engineers to train models that can understand how much compute a job needs, how it scales to larger machines, whether a machine can run more jobs, and so on; and staff infra engineers to take those models and deploy them on real-world production systems.

We're also looking for FDEs who can help us talk to users and run pilots. This is a pretty technical role (you need to be able to do data analysis and debug in prod) that's also user-facing - it should be a good fit for a former (or future) technical founder.

If this sounds cool, please email me: alexis [at] espresso [dot] ai

Trace Labs | Remote (USA) | Full Time | https://tracelabs.ai/ Want to join a lean, ambitious, and fast growing startup? Trace is building the data infrastructure 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 Engineer: https://jobs.ashbyhq.com/tracelabs/963005ce-f4f1-4d54-957d-1...

- Computer Vision Engineer: https://jobs.ashbyhq.com/tracelabs/774fbd47-20ce-4665-9bdb-5...

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.

MindFort AI (YC X25) | Backend Software Engineer, AI Researcher | Los Angeles, CA | Full-Time

I'm a founding engineer at MindFort (https://www.mindfort.ai). We build autonomous AI security agents that pen test your software before attackers do: finding, exploiting, and patching vulnerabilities. Backed by YC, Soma Capital, etc.

- Software Engineer (Backend + AI) | $150k–$250k + Equity: Architect and scale our agent systems from scratch. Python, Postgres, Docker, K8s, LangChain/LangGraph. Cybersecurity background a plus but not needed.

- AI Researcher | $150k–$250k + equity: Own the research behind how our agents reason, plan, and chain exploits. LLM fine-tuning, RL, eval design, multi-agent systems. Security or red-teaming background a plus.

Both roles include founding-level equity, 100% health coverage and unlimited PTO.

More Info + Apply At: https://www.ycombinator.com/companies/mindfort

Location: India

Remote: Yes

Willing to relocate: Yes

Technologies: Python, Django, AWS (EC2, EKS, VPC), Docker, Kubernetes, GitHub Actions CI/CD, SQL

Résumé/CV: https://omtiwari.tech/resume.html | https://www.linkedin.com/in/tiwariom/ | https://github.com/omtiwari17

Email: work.om.tiwari@gmail.com

Recent 2026 Computer Science Graduate and Backend/Cloud Engineer focused on secure architecture and deployment automation.

* Cloud & CI/CD: Engineered GitHub Actions pipelines to deploy Dockerized apps to AWS EKS clusters with zero-downtime rolling updates.

* Backend Systems: Built secure Python/Django portals utilizing strict Role-Based Access Control (RBAC) to protect sensitive data workflows.

* Real-Time Data: Developed live analytics dashboards featuring smart API polling and custom algorithms for dynamic probability calculations.

* Certifications: AWS Academy Cloud Architecting & Foundations (AWS); DevOps Foundation, Generative AI, and Agentic AI (Datagami x NASSCOM x IBM).