Stealth Startup | Founding Engineer | NYC (in-person 5x/week) | Full-Time

The mission We’re building a best-in-class multi-modal AI agent product (voice + SMS + email) with the potential to disrupt deeply entrenched software businesses and unify a fragmented industry. We’re a tiny team with real traction pre-product, moving fast, and we care obsessively about craft.

Why this role This is a founding engineering seat: you’ll be an early builder shaping the product, architecture, and quality bar from day one. In the first 3–6 months, the role is highly IC-focused. As we scale (including our first in-person hub/site and new hires), this role has optionality (i.e., growing into a leadership role or staying on the IC track and owning the engineering roadmap) for the right person.

What you’ll do

Build real-time systems for voice (streaming audio, low latency, turn-taking), SMS, and email automation with robust state + memory. Design the foundation: architecture, data model, reliability, observability, deployment, and developer velocity. Set the quality bar: clean code, pragmatic abstractions, testing strategy, “don’t break prod,” and thoughtful product UX. Partner closely with the co-founders on product decisions. You’ll have real influence over what we build and how it feels + how it's designed.

What we’re looking for You should be able to work anywhere in the stack (frontend, backend, infra, integrations) and you know how to make smart tradeoffs.

Strong product sense: you’re obsessive about confusing UI and you want to make workflows feel magical. Systems thinking: you can design for latency, reliability, and iteration speed (especially for real-time voice + agent state). High ownership: you run toward ambiguity, unblock yourself, and care deeply about outcomes. Startup mindset: high-risk/high-reward energy, low ego, high pace.

Bonus points:

Experience with agentic systems: LLM orchestration, tool calling, RAG, evals, prompt/versioning, guardrails. Voice/telephony or streaming experience (WebSockets/WebRTC, audio pipelines, turn detection). Messaging + deliverability experience (SMS workflows, email sending, compliance/opt-in, bounce handling). Familiarity with modern stacks (examples): TypeScript/Node, Python, React/Next.js, Postgres, Redis, queues, Docker, AWS/GCP, observability.

Parabola | Site Reliability Engineer | San Francisco, CA (Hybrid) | Full-time

Parabola is a no-code data workflow automation tool that helps operations teams move, transform, and automate their data without writing code. LLMs are a core part of our product — we use them to help users build and reason about their workflows — and they're increasingly part of how we run infrastructure too. We're a small, product-focused team and our infrastructure runs on AWS. We're looking for an SRE who's passionate about observability and keeping systems healthy and understandable. You'll own our monitoring and alerting infrastructure, drive incident response, and work closely with engineering to make sure we have deep visibility into everything that matters. We expect you to use LLMs heavily in your work — writing runbooks, generating alert configs, drafting postmortems, building dashboards — and we want someone who's already figured out how to make that feel natural. What you'll work on:

Observability stack — Prometheus, Grafana, dashboards, alerting, and on-call workflows Incident response and postmortems — building a culture of learning from failures SLIs, SLOs, and error budgets — helping the team make data-driven reliability decisions Monitoring LLM-specific infrastructure: latency, token throughput, model error rates, cost attribution AWS infrastructure across our stack (Lambda, ECS, RDS, OpenSearch, CloudFront, etc.) CDK-based IaC and CI/CD pipelines as needed

What we're looking for:

Hands-on experience with Prometheus and Grafana (or similar — Datadog, Honeycomb, etc.) Strong instincts for what to instrument and what good alerting actually looks like Comfort debugging distributed systems across the full stack Experience owning on-call and incident response end to end AWS familiarity and enough IaC experience to get things done (CDK or Terraform) Someone who reaches for an LLM before writing boilerplate from scratch — and knows when not to

Nice to have: experience instrumenting LLM pipelines, familiarity with TypeScript/Node.js, startup experience, or a background in security and compliance.

Reach out at cj@parabola.io or apply at https://jobs.ashbyhq.com/parabola-io/75141699-0666-4baa-b03f....

Walmart Global Tech (International Digital Experiences) | Frontend Software Engineer | Sunnyvale, CA (Onsite)

What you’ll do

- Build modern, scalable UIs with React, modular CSS, Redux, React Query, and GraphQL - Improve and refactor existing codebases with a focus on simplicity and performance - Partner closely with product, design, and UX to create intuitive customer experiences - Own features end-to-end and ship to large-scale production daily - Share knowledge and contribute to a strong engineering culture

What we’re looking for

2+ years of software development experience. Experience building responsive SPAs with React (or similar frameworks). Solid understanding of JavaScript, React, and Node.js fundamentals. Experience with REST APIs (building or consuming). Curiosity, product sense, and a bias toward shipping

Nice to have

Exposure to GraphQL, Next.js, Nx, or modern frontend tooling

Details

- Location: Sunnyvale, CA (onsite only)

- Visa: No sponsorship available

Email: gaurav.sharma0@walmart.com - please mention HN in your email

Steel | Applied AI Engineer + Infrastructure Engineer | Toronto, ON | ONSITE | $160k-$240k USD base + equity

Steel is open-source browser infrastructure for AI agents and apps. We make it easy for developers to ship products that interact with the web - without spending 80% of their time on browser pools, proxies, CAPTCHAs, and session state. In 2025 we grew 50x: 6,000+ GitHub stars, dozens of paying customers, millions of sessions served monthly. Dedicated chromium runs on Firecracker VMs for sub-second cold starts.

Stack: TypeScript, React/Next.js, Node.js, AWS, Firecracker, Postgres, Redis. 4+ YOE for both roles.

--- Applied AI Engineer ---

Shape how AI agents interact with the web. Build open-source frameworks/demos on the Sessions API, run experiments on which models/prompts/harnesses actually work, build evals against real scenarios, and work with customers shipping agents to production. AI-native full-stack engineers with strong product sense.

--- Infrastructure Engineer ---

Design and operate the systems Steel runs on. Sample projects: VM snapshotting that restores full browser state in under a second, performance-tuning the Sessions API from kernel traces, orchestrating millions of sessions with sub-second cold starts. Distributed-systems experience, strong AWS/GCP and Linux/OS fundamentals. Rust is a plus.

Public referral bonus: $10,000 if your intro becomes a hire.

Apply: email careers@steel.dev with GitHub & resume, mention HN.

At Tether (https://tether.io/) we're hiring!

We envision a world where technology enables financial freedom, educational empowerment, energy sustainability, and data sovereignty.

All of our roles are fully remote, worldwide. Apply now:

- Mobile Developer (React Native): https://careers.tether.io/o/react-native-developer-wallet-te...

- Lead Mobile Developer (React Native): https://careers.tether.io/o/lead-software-engineer-mobile-de...

- AI Inference Engineer QVAC: https://careers.tether.io/o/ai-inference-engineer-qvac-100-r...

- Fullstack Developer: https://careers.tether.io/o/senior-fullstack-developer-100-r...

- Frontend Developer: https://careers.tether.io/o/senior-frontend-developer-kyc-wo...

- Backend Developer: https://careers.tether.io/o/senior-backend-developer-nodejs-...

- Technical Product Manager (QVAC/ AI): https://careers.tether.io/o/technical-product-manager-qvac-1...

- Technical Product Manager (Hadron/ Tokenization): https://careers.tether.io/o/technical-product-manager-hadron...

Brandfetch (https://brandfetch.com) | Senior Backend Engineer | Remote | Full-time

Brandfetch is the internet’s canonical source for logos and brand assets. Think GitHub for brand identity: a brand repo that auto-indexes public assets, lets brand owners “commit” changes once, then propagates them—instantly and immutably—through CDNs, plugins, and APIs used by companies like Google, Canva, Salesforce, and soon … everywhere.

Problems you'd work on:

- Nightly curation bot auto-fixing outdated assets across 52M+ repos

- Next-gen ingestion and partition-key schema to leap from millions to billions of assets

- MCP server that exposes structured brand data to any AI agent or LLM, letting them fetch brand context on demand

- Vector search: surface any logo with ≥90% similarity in <50ms

- Real-time metering that pings Stripe the instant a user tops their quota

Stack: Node.js, TypeScript, Python, AWS (Lambda, DynamoDB, CloudFront, S3, CloudFormation), Serverless.

You:

- 8+ years of experience in backend software development.

- Proficiency with AWS tools (Cloudformation, API Gateway, DynamoDB, Lambda, Cloudfront, S3, IAM, OpenSearch).

- Experience with building REST APIs.

- Ability to write well-documented, clean code.

- Experience with building DevOps pipelines using Serverless.

- Great communication skills (we work across multiple timezones and document everything).

- Experience with Machine Learning.

Competitive salary + equity in a profitable, growing company.

apply: career at brandfetch.io (no recruiter please).

Holepuch|Remote, Worldwide|Senior Node.js Software Engineer

At Holepunch, we are redefining the internet’s architecture. Our open-source P2P platform, Pear, enables developers to deploy applications directly from their machine to users, creating scalable, decentralized applications without traditional server infrastructure. We are seeking Node.js Software Engineers to join our 100% remote, globally distributed team. You’ll work on our P2P stack, which includes over 1500 public npm modules, and help expand our ecosystem.

Why Holepunch?

- Work on groundbreaking technology that prioritizes user autonomy and privacy. - Collaborate with a team of thinkers and innovators dedicated to reshaping the digital landscape. - Contribute to a future where technology serves humanity, not the other way around.

Apply now to join our mission:

https://holepunch.recruitee.com/o/p2p-nodejs-engineer?source...

https://holepunch.recruitee.com/o/senior-node-engineer?sourc...

Maiven | Full-Stack Engineer, UX/UI Designer, Energy Modeling Engineer | REMOTE (US) | Full-Time

At Maiven Energy, we're working on real-world problems at the intersection of responsible AI and residential energy. Our aim is to make energy upgrades smarter, faster, and more accessible, while helping reduce carbon emissions. We're a small, mission-driven team punching way above our weight: we have large utility customers, contracts in multiple states, and a growing pipeline of programs launching later this year. We're venture backed and moving fast.

We're hiring for three positions:

- Full-Stack Engineer – NestJS, React, Tailwind, TypeScript, Node, Postgres, AWS, Lambdas. [1]

- Energy Modeling Engineer – Python, pandas, AWS, modeling frameworks (ResStock, OpenStudio, etc.). Experience with energy programs or building science is a huge plus. [2]

- UX/UI Designer [no link]

Looking for builders who want real ownership, thrive in early-stage startups, and move with urgency and care. More: https://www.askmaiven.com

To apply: email hiring _at_ askmaiven.com. Generic, AI generated cover letters and resumes are discouraged.

[1] https://climatebase.org/job/69488877/fullstack-engineer

[2] https://climatebase.org/job/69488878/energy-modeling-enginee...

Location: Charleston, SC

Remote: Yes

Willing to relocate: Yes

Technologies: Ruby, Python, JavaScript (ES6), TypeScript, React, Node.js, PostgreSQL, MongoDB, OpenSearch/Elasticsearch, AWS (ECS, EC2, VPC, ALB, Secrets Manager), Docker, Terraform, OpenTelemetry, Jaeger, Prometheus

Resume/CV:https://drive.google.com/file/d/1aBYTxqlWIKmm59UT5ffK493tKR0...

LinkedIn: https://www.linkedin.com/in/zane-lee-14496a297/

Email: zanedev28@gmail.com

GitHub: https://github.com/Kcstills17

Co-creator of Retriever (https://runretriever.app/), an AWS-deployed observability platform that enables AI-powered trace analysis through distributed systems. Built a custom MCP server allowing developers to query trace data using natural language through LLMs like Claude, optimizing context consumption through intelligent data distillation from verbose OTLP structures.

Experienced with building full-stack applications. I am comfortable using AWS as a cloud environment and have experience with AI technologies such as RAG, MCP, and Vector embeddings.

Ashby | YC 19 | REMOTE | Hiring Product Engineers | Sr: $153k-$220k, Staff: $190k-$275k Ashby is the all-in-one recruiting platform powering hiring at the world’s most innovative companies. If you cmd+f “Ashby” you’ll see that we’re powering many of job postings in this thread!

* Grew our engineering team from 30 -> 60 last year with plans to double again in 2026.

* 80%+ of our engineering team is made up of Senior-Staff+ level Product Engineers. We give an unusual amount of ownership to our engineers to build features end-to-end. Many of our most loved features were build entirely by a single engineer!

* 100% remote asynchronous culture with an even distribution of engineers across North America and Europe

* Full transparency on engineering levels + comp: https://www.ashbyhq.com/blog/engineering/leveling-and-compen...

Stack: TypeScript (frontend & backend), React, GraphQL API, Node.js, Postgres, Redis.

Full list of open roles: https://www.ashbyhq.com/careers

Location: US Northeast / Greater Boston Remote: Yes, Remote preferred Willing to relocate: For the right fit, NYC or Europe.

https://drive.google.com/file/d/1iRTOzJ6X3dVCkaiIBAsFfT_Ydcn...

Email: luchenbrendan@gmail.com

Known for refactoring ruthlessly, hunting root causes, and fighting for the users often while talking with my hands.

Technologies: Are listed on my resume and gravitate around fullstack. To get past bad filters, I enumerate JavaScript TypeScript React Next.js Node.js Python Tailwind Linux Java Kotlin Android React Native Docker Git PostgreSQL GenAI AgentAI and Supabase.

Seeking: Bonus points for work in Health, Education, or Environmental sectors. Full remote is ideal, but Hybrid 40% in the Boston metro is fair game, and if you are still reading, have a wonderful day and make a stranger smile.

Statement: Hire me for versatility as a polyglot agnostic builder of stuff, mentorship capacity to strengthen your whole team, bulletproof optimism in a fast-paced and uncertain world, a low-maintenance and well-behaved ego, and the occasional classy dad joke (no, I don't have kids).

Location: Rawalpindi, Pakistan Remote: Yes Willing to relocate: No Technologies: React, TypeScript, Node.js, Express.js, PostgreSQL, MongoDB, Flutter, OpenCV, Tailwind CSS, Bootstrap Portfolio: https://fatima-usman-dev-aovrrer.gamma.site/ Email: fatimaausman8@gmail.com

Frontend/Full-Stack Engineer with 2 years experience building consumer-facing applications. Led a 4-person team to 2nd place at EXPO'24 (COMSATS) for an AI-powered fashion platform with computer vision. Delivered full-stack features for retail tech and data analytics projects. Seeking remote frontend or full-stack roles with growth opportunities.

Hello,

I hope you’re doing well.

I’m currently looking for a job and exploring new opportunities.

Full Stack Developer with 7+ years of experience (React.js, Next.js, Node.js, TypeScript, Laravel).

If there are any relevant openings, please consider my profile.

Please suggest where i can apply, not getting any opportunities

Promptwatch | https://promptwatch.com | Amsterdam, Netherlands | HYBRID/ON-SITE | Full-time | https://promptwatch.com

====================

Promptwatch helps companies track and improve their visibility in AI search /ChatGPT, Google AI mode and any other AI app. (GEO).

We handle 1,500/events/second, run millions of prompts a day, analyze them for brand mentions, sentiment, competitive intelligence, and help companies create and optimize content. We have the largest GEO insights platform with billions of prompts, responses, clicks, and mentions.

Work: Own app layer, real-time APIs & queues; ship end-to-end features.

Stack: TypeScript, React 19/Next.js, Node, tRPC, Postgres, GCP, Nice to haves: ClickHouse, Elasticsearch.

You: 8–9 YOE, strong TS/React/Node.

Comp: €90k–€110k + equity.

Apply: https://promptwatch.com/careers/senior-full-stack-developer-... (mention “HN: Full-Stack Developer”).

Marker Learning - Founding Full Stack Engineer – Remote (USA) – 180-250k

I have dyslexia. I was one of the lucky ones. Diagnosed at eight, I got accommodations and support before things spiraled. Most kids aren't so lucky. The path from initial concern to diagnosis can take years and cost families upward of $5,000. For many, it never comes at all. In one study, 50% of prisoners were found to be dyslexic, with 80% functionally illiterate.

Behind every missed diagnosis is a kid who gets told they're lazy, when the reality is no one ever gave them the right test.

Marker Learning is building an AI-enhanced assessment platform that makes identifying learning differences faster, cheaper, and more equitable, especially for multilingual students who are routinely misidentified or overlooked. Imagine if every kid could be screened for learning differences as easily as they're screened for vision. That's what we're building.

This isn't a chatbot or a homework helper. We're a Series B company backed by Reach Capital, Andreessen Horowitz, and Primary, running a multi-million-dollar longitudinal study spanning K–12 and developing the psychometric engine behind it. We need engineers who are excited by that.

We're hiring a hands-on full-stack engineer (React, Node.js, TypeScript) to help build and scale the platform: adaptive testing infrastructure, AI-powered scoring scoring and data pipelines, and the systems that maintain clinical rigor at scale. High autonomy, lightweight process, fast-paced. 8–10+ years, ideally with 0-to-1 or early-stage experience. You'll work directly with psychometrics, product, and data science, and the engineering decisions you make now will define the platform for years.

Reach out directly with your gh, linkedin, and resume and why you want this position to lucie@markerlearning.com. Please specify your location, if you are interested in full time, contract or open to both. Make the subject "Founding Engineer Application (I am not a bot)".

COVU | Data Engineer, Full Stack Engineers (Sr & Staff/Lead), Sr. Product Manager | San Francisco (Hybrid) or REMOTE (US) | Full-time

COVU is an AI-first insurtech startup rebuilding the 20-year-old legacy infrastructure of the $365B+ insurance distribution industry.

We recently announced our $16M funding round (bringing our total to ~$50M) and launched COVU OS. We aren't just slapping an "AI wrapper" onto old software; we built a task-native orchestration layer from scratch. COVU OS converts messy, unstructured insurance workflows (emails, PDFs, manual triage) into defined tasks, dynamically routing them to the right execution layer—whether that's an AI agent, a licensed human professional, or an offshore team.

We are a scrappy, execution-focused team of builders. We heavily encourage using AI tools (Cursor, Copilot, Gemini) in your daily workflow to ship code faster. If you hate spending months in "discovery" and prefer to just build and own production systems end-to-end, you will fit right in.

The Stack:

Data: Snowflake, dbt, Airflow, Python

Product: TypeScript, React, Node.js / Python backends, Cloud Infrastructure

Open Roles:

Staff Full Stack Engineer (Technical Lead): You will be a foundational technical leader shaping the architecture of COVU OS. Expect deep, architecture-level design work paired with heavy, hands-on IC contributions.

Sr. Full Stack Engineer: You will own complex product surfaces end-to-end, building out the agentic orchestration layer, user interfaces, and enterprise API integrations.

Data Engineer(Remote): You'll be the primary builder of our "Golden Policy Journal," transforming highly complex, messy carrier data into our single source of truth using Snowflake, dbt, and Airflow.

Sr. Product Manager (COVU OS): You will own the roadmap for our core operating system. We need a highly technical PM who can dive into the weeds of agentic workflows and write specs that engineers actually want to read.

To apply for any of these roles, visit: https://www.covu.com/careers

Nova Credit | Remote (US, Canada)

We're building a unified platform for credit and financial data to power financial inclusion globally. Our mission is to unlock economic opportunities for consumers historically excluded from traditional credit systems by transforming diverse data into actionable risk insights. We are YC company backed by investors from Canapi Ventures, Kleiner Perkins, General Catalyst, and Index Ventures

-> Hiring software engineers from Senior to Staff, Engineering Manager, Product, Design & Analytics roles.

-> Tech stack: Node.js, React, TypeScript, Python, PostgreSQL, AWS

You'll work on enterprise-grade APIs, data integrations, advanced analytics, and seamless user experiences. We're looking for engineers who thrive in fast-paced environments and want to make a meaningful impact on financial inclusion.

Apply at https://job-boards.greenhouse.io/novacredit and mention HN.

Yassi|Senior Fullstack Engineer (Golang, Node.js/React, AWS) 3 days in-office Chicago

YASSI provides real-time access to vehicle title, lien, and registration data directly from U.S. state motor vehicle agencies. Unlike traditional bulk data providers, YASSI retrieves each vehicle record live at the time of request, ensuring the most accurate and current information available.

YASSI is the only provider offering an enterprise-grade solution purpose-built for real-time vehicle data at national scale. In addition, YASSI is uniquely positioned as the only platform that combines real-time vehicle record access with digital repossession title processing, enabling lenders to verify lien status and complete repo titling workflows within a single, integrated solution.

We’re rethinking how vehicle data, titling, and compliance infrastructure works— bringing real-time connectivity and transparency to an industry that’s long overdue for modernization. We are already profitable 6 years in. That is unique for a start-up.

Actively building out our engineering team in downtown Chicago and we are open to senior/staff level.

Job description here:

Sr. Full-stack Engineer - https://apply.workable.com/yassi/j/60C534A983/

Email at: patti -dot- lopez - at - yassi - com

Missive | Senior Backend Developer | REMOTE | Full-time

Missive brings inbox collaboration to teams that run on email.

This isn’t your typical SaaS; it’s a full-fledged app users live in all day. We integrate with dozens of APIs and servers, process 10M+ emails, 100M+ requests per day serving thousands of users who collaborate in real-time. If you’re excited by data at large scale, complex edge cases and third parties that always find new ways to fail, this is for you.

Missive started over a decade ago. It is mature, still 100% founder-owned and highly profitable. We’re in it for the long run; a small, dedicated team building a product customers genuinely love.

We keep our stack simple and that doesn’t mean boring. The backend is a Rails monolith, Postgres, plus a few tiny services in Ruby, Node or Bun.

Read more and apply here: https://jobs.rubyonrails.org/jobs/27037-senior-backend-devel...

Fixly | Senior Software Engineer (Backend, Node) | Poland | Remote (PL) | 2 days in office per month | Polish language required

Fixly is one of the largest service marketplaces in Poland, connecting customers directly with local service providers — from handymen and electricians to accountants and language instructors. We're a product team building the platform that helps thousands of professionals find work every day.

We're hiring a Senior Software Engineer to join our team. Remote-first within Poland, with one 2-day onsite in Poznań each month (travel covered). Polish language required.

What we're looking for:

- Strong backend experience with Node.js - Senior-level engineer comfortable owning systems end-to-end

Big pluses:

- DevOps experience - AWS experience - Frontend, Golang, or mobile experience

If you're a backend engineer who's also picked up infra/cloud chops along the way, we'd love to talk.

Interested? Send your CV/resume to recruitment@fixly.group and mention HN — we'll get back to you.