Mainstay | Senior/Staff Software Engineer (Full-stack) | Remote (US) | Full-time

Mainstay is a market intelligence platform for large real-estate operators. We’re an AI-native company focused on turning complex, messy, real-world data into systems customers actually trust to make financial decisions. Mainstay was incubated at Opendoor, spun out in 2024, and recently raised a Series A led by Khosla Ventures.

We’re hiring a Senior/Staff Software Engineers, but we care more about ownership and judgment than title.

You'll work on:

- Designing and evolving foundational data models used across the platform

- Building backend services, workflows, and automation systems end-to-end

- Applying AI/LLMs pragmatically (automation, reasoning over messy inputs, decision support)

- Shipping user-facing product features tied directly to real customer workflows

- Owning problems from idea → production → iteration

Stack: Python, TypeScript, React, AWS

Check out the roles at: https://www.mainstay.com/careers

Chestnut | Hiring Senior / Staff Software Engineers | SF + Seattle (Hybrid) | https://jobs.ashbyhq.com/Chestnut

Chestnut builds software insurance carriers actually run their business on. We replace legacy, manual distribution systems with real-time data, automated workflows, and AI-driven tooling in a space that hasn’t changed much in decades.

This is product engineering. We ship to real customers, operate what we build, and spend time fixing the sharp edges that show up in production.

You’d work on backend-heavy product features around onboarding, compliance, payouts, and integrations. A representative problem: building a commission payout flow that ingests messy carrier data, applies complex rules and hierarchies, explains results to ops, and executes payouts that must reconcile cleanly with finance—while handling holds, chargebacks, retries, and partial failures.

Stack: Go, TypeScript/React, Postgres, Temporal, Kubernetes, AWS, LLM tooling.

Roles:

- Senior Software Engineer – Product / Backend (https://jobs.ashbyhq.com/Chestnut/fbbb7601-3d31-48b4-8639-75...)

- Staff Software Engineer – Architecture & Scale (https://jobs.ashbyhq.com/Chestnut/f28c5ee5-12aa-4e7b-b0ea-f5...)

- Engineer – Agent Orchestration & Workflow Systems (https://jobs.ashbyhq.com/Chestnut/075a0010-bfa5-489e-8808-e9...)

Hybrid in SF and Seattle.

Questions or want to sanity-check fit: nick [at] chestnut [dot] com

> $8k contract → 5% equity

Surely this is a typo, and you mean 50% equity?

[delayed]

Cogram | Full-time | Remote (CET ±3) | https://cogram.com | B2B Saas / AI for AEC

Cogram is an AI platform for the architecture, engineering, and construction industry. We automate project admin such as RFIs & submittals, email filing, field notes, meeting minutes, and reporting. World-leading architecture and engineering firms have adopted Cogram at scale. We're backed by YC and Initialized.

We're looking for product engineers that ship high-quality software and are good at talking to users and understanding requirements. You're comfortable across the stack and own features end-to-end. A strong sense for good UI/UX is required. Experience in 3D modeling / CAD / BIM is a big plus.

Stack: Python (FastAPI), Postgres, Redis, React/TypeScript, React Native/Expo, Terraform/Kubernetes on AWS & Azure. Fully remote, three off-sites/year, ~38 paid days off, competitive salary + equity.

Apply: r+hiring[at]cogram[dot]com with GitHub/LinkedIn/portfolio and a short note, including your current agentic-coding setup.

Chroma | ONSITE - San Francisco | Full-time | https://trychroma.com

Chroma is the open-source search database for AI applications. It supports dense vector, sparse vector, regex, and full-text search. We support local, single-node, and cloud hosting.

We're a team of 14, all engineers today. We work in Rust, Python, Typescript, and Go.

We're hiring for these areas:

- Account executive (founding)

- Database storage engineer

- Distributed systems engineer

- Platform engineer

- Product engineer

- Product designer

Learn more and apply here: https://www.trychroma.com/careers

Featurebase | Full-stack Product Engineer | REMOTE (EU) | Full-time

Modern customers support & product feedback platform powering thousands of teams, including Lovable, Raycast, and n8n. Fully bootstrapped, profitable, and growing fast.

We’re building a full customer-facing suite where teams can handle their customer support, feedback prioritization, and product updates - all in one place.

We’re looking for a full-stack product engineer to own and ship core product features end-to-end, with a direct impact on Featurebase’s future.

Stack: NextJS + Typescript for the frontend, Node.js for the backend, MongoDB, Redis.

If you like small teams, autonomy, and shipping meaningful product work, we’d love to have you on board!

Apply here (we read every submission): https://go.featurebase.app/careers

EggAI | Software Engineer, Team lead, AI engineer | REMOTE (EU, Switzerland, Norway) | Full-time or Contract

We have multiple roles open: - Senior Python Developer - Technical Team Lead - AI engineer, 2+ years of hands on experience with production-deployed AI: apply as "Python Developer" and ensure that AI experience is explicit in your resume, I am manually looking through each of them.

We are a small boutique consultancy and are quite experienced. A lot of us have extensive consultant experience. You will join a small, highly skilled remote team of engineers and transformation practitioners working at the forefront of enterprise AI.

We use AI for both development and in our solutions. We are looking for engineers that are critical thinkers, understand the limitations of AI but also where it can have a positive impact.

You’ll design and implement backend services, event-driven architectures, and multi-agent communication layers using modern Python, Pydantic, async frameworks, and cloud-native tools.

Apply at: https://grnh.se/wr97lgu2teu

Our website: https://egg-ai.com/

Your recruiter is crazy disrespectful btw

Nesting Navigator | Technical Co-Founder | REMOTE | $8k contract → 5% equity

Building AI-guided financial platform. Conversational AI (think Duolingo's owl for finance) that guides inexperienced users through an entire journey.

Stack: React/Next.js, LLM integration, mobile-first, API aggregation Looking for: Full-stack dev with AI/LLM experience who wants equity partnership

Not a gig. Co-founder role/Teammate

Email: jed@nestingnavigator.com

OmniAI (YC W24) | https://getomni.ai | Full Stack Engineers | SF In-Person | Full Time | $125k–$175k • 0.50%–1.50%

Tech stack: TypeScript | Node | React/Next.js | Postgres | Docker | K8s | LLMs

We’re building the AI-powered infrastructure layer for small-business lending. Banks and fintechs use Omni to automate document collection, financial modeling, public-record research, and ongoing borrower communication.

You’ll work on:

1. Wrangling messy PDFs into usable data (we built a major open-source extraction library: https://github.com/getomni-ai/zerox)

2. Aggregating millions of datapoints from 50+ public sources (UCCs, liens, licenses, tax records) + credit/KYC/AML data

3. Building real-time financial models that combine OCR, LLMs, and rule-based systems into predictable outputs

We’re early, you’ll have a huge impact. Email me (my name at the URL) or apply here: https://www.ycombinator.com/companies/omniai/jobs/Dr0GIaE-fu...

Sumble is the newco from the founders of Kaggle. We are hiring full stack engineers, ai/ml engineers and growth/marketing. Can view our roles and apply here: https://sumble-inc.workable.com/

We are building a knowledge graph from web data with a first focus on data for go-to-market teams.

We use web data to identify things like org structure, tech stack, and key projects (e.g., GenAI initiatives, cloud migrations). Our product already has strong product-market fit, early revenue, and happy customers — and now we’re ready to accelerate.

Our long-term vision is to become the world's best data vendor. Try the product at sumble.com.

We are a team of 25 with experience at companies such as Google, Meta, Stack Overflow, Rippling, Snowflake, Confluent and Kaggle.

We recently announced a $38.5MM financing: https://techcrunch.com/2025/10/22/sumble-emerges-from-stealt...

Parallel Web Systems | San Francisco/Palo Alto | ONSITE | Full-time

Parallel builds web infrastructure for AI: think low level primitives for retrieval and automation but also high-level structured products for performing repetitive tasks using AI + web data: enrichment, deep research, web monitoring, etc. - our founder is Parag Agrawal, ex-CEO of Twitter. We raised $130M.

We're hiring for 12 roles:

- GTM - Forward-deployed engineers - AI Researchers - Front end dev + More

If you don't see a role that suits you, get in touch. Same user on X/LI.

https://jobs.ashbyhq.com/parallel

Mobasi | Founding Engineer | Austin, TX / Remote | $240k + Profit Sharing | https://mobasi.ai

Mobasi builds autonomous AI agents for digital forensics. Our software orchestrates 150+ forensic tools to help law enforcement turn days of manual evidence analysis into minutes, aiding in cases involving child exploitation, trafficking, and homicide. We are bootstrapped, profitable, and shipping fast.

We are looking for our first hire outside the three co-founders to own infrastructure, DevOps, and compliance. You will transition our build pipeline from manual updates to an automated delivery system scaling to thousands of agencies. You will manage infrastructure across AWS, GCP, Azure, and AI providers, while owning CJIS and SOC2 compliance.

Tech Stack: Rust, TypeScript, Python, Tauri, Next.js, Docker, Pulumi, Terraform.

We work as a small SWAT team. We are AI-native and expect you to use tools like Cursor and Claude to ship significantly faster. We do not have sprints or daily standups. Instead of lottery-ticket equity, we offer a high base salary and direct profit sharing.

Apply here: https://jobs.ashbyhq.com/mobasi/b385d2bb-d338-44cc-8728-f0eb...

Unit | San Francisco, CA | On-site | Full-time | Multiple Roles | https://www.unit.inc/

Unit is building GTV, a new video platform that can autonomously produce high-quality, personalized content.

Our team is from Instagram, TikTok, and NVIDIA. We're backed by Khosla Ventures, Air Street Capital, and angels from top AI labs. We have strong traction, paying customers, and an exciting year ahead.

We're hiring for multiple roles:

- Backend Software Engineer: https://jobs.ashbyhq.com/gtv/d17dd0c3-cb91-4dcb-8543-3752807...

- Fullstack Software Engineer: https://jobs.ashbyhq.com/gtv/7ef9e46c-7b8c-49c3-b138-b055af7...

- ML Infra Software Engineer: https://jobs.ashbyhq.com/gtv/954d9a64-90f1-4e38-85c9-9873a60...

- Product Designer: https://jobs.ashbyhq.com/gtv/9b36a9a2-a865-4cc8-8b88-0892189...

If you're interested, please reach out directly to us at careers[at]unit.inc

Duranta | Staff Backend Engineer | On-site, Seattle or NYC | Full-Time

Duranta | Staff Frontend Engineer | On-site, Seattle or NYC | Full-Time

Duranta is making a "business-in-a-box" SaaS for landscaping companies. We have a rather neat offline-first mobile application and a webapp. We also have a custom AI visual model to do estimations based on the satellite imagery (we're not shelling out to OpenAI/Gemini/...). Our stack is Go+Postgres on the backend, a bit of Python, and React/React.Native on the frontend.

Website: https://getduranta.com/ Jobs: https://jobs.lever.co/getduranta/c416cd42-3709-4de0-91ae-385... and https://jobs.lever.co/getduranta/50af551a-9a5c-498c-9729-6f2... You can apply there or by emailing me at alex@getduranta.com (add HN in the topic).

BMO Capital Markets | Software Engineer (Associate) | Toronto, Ontario, Canada | Full-time

We’re building and maintaining a quantitative investment strategy (QIS) calculation engine used across Global Markets. You will work closely with sales, trading and the structuring teams to implement the infrastructure required to calculate quantitative indices in an efficient and scalable manner.

We are looking for an experienced engineer with strong C#/.NET skills and solid Python experience (including C#/Python interop such as Pythonnet, gRPC, or similar). Work involves integrating with data providers (Bloomberg, various index providers, internal kdb, etc..), implementing QIS indices in C# and Python, developing APIs for internal teams.

Tech: C#/.NET 8, SQL Server, kdb, C#/Python interop, distributed systems, CI/CD, containers/cloud.

To apply: https://bmo.wd3.myworkdayjobs.com/External/job/Toronto-ON-CA...

alias (GOAT Group) | Los Angeles, CA | Remote | Full-Time | alias.org

alias helps people sell their footwear and apparel. We're owned by GOAT Group which also owns GOAT, FlightClub, and Grailed. We did over 1B in GMV last year. IYKYK. We work to make seller's lives easier, help them accomplish their goals, and provide top-tier market insights.

We're looking for Backend Engineers who: - Have a bias towards action - Are incredibly curious with a drive to learn new technologies - Are data driven and can reason about large systems

Tech stack: Go microservices, DynamoDB, redis, some exposure to rails + postgres

Apply at https://job-boards.greenhouse.io/goatgroup/jobs/4623586005. Mention in the application that you saw our post on HN.

Sheer Health (https://www.sheerhealth.com) | New York, NY | Full-Time | ONSITE If you or a loved one has ever suffered from confusing/egregious medical bills or insurance communications, this is your chance to give the power back to others in a similar situation.

Our mission is to demystify health insurance, healthcare and medical billing. By utilizing cutting-edge technology and advanced data analytics, we deliver personalized recommendations on how to save money, maximize use of plan benefits, stay on top of reimbursements and avoid erroneous or inflated medical bills.

Currently open roles:

---

Software Engineer, Fullstack

($140-190k + equity)

Help us architect and build our platform across our go backends and react frontends on Google Cloud Platform.

---

Software Engineer, Browser Automation

($140-190k + equity)

Help us build out browser automation to investigate and answer tricky questions about insurance using playwright and browser agents.

---

Drop us an email to hn ~at~ sheerhealth.com if these sound interesting!

Fanvue | AI Internal Developer Tooling Engineer | REMOTE (London based, GMT-5 to GMT+5 preferred) | Full-time

One of the coolest roles we've had: experiment with cutting-edge AI tools to make talented engineers faster and more effective. Hands-on, experimental, operating at the frontier.

Fanvue is a fast-growing creator monetisation platform — AI-powered, creator-first (Series A, $100M+ ARR, triple-digit YoY growth), supporting hundreds of thousands of creators and millions of fans.

What you'll do: Define and roll out our AI-assisted dev stack (Cursor, Claude Code, etc.) across IDEs, PR workflows, and CI. Build MCP servers and AI-ready infra for context-aware code generation. Enable parallelised workflows, agent skills, and AI-assisted reviews. Establish best practices for safe, consistent AI-assisted coding. Track and report measurable impact. Evaluate emerging tools with clear success criteria.

Who you are: Strong software engineering background with TypeScript in production. Hands-on with AI coding tools (Cursor, Claude Code, Aider, Copilot). Experience with MCP servers. Solid LLM fundamentals (RAG, embeddings, fine-tuning). Comfortable with GitHub workflows and CI/CD. Autonomous, experimental, outcome-focused.

You'll thrive if you want to make engineers dramatically more effective, enjoy rapid experimentation, and own outcomes. You'll struggle if you prefer fixed roadmaps or need heavy direction.

Why Fanvue: Define responsible AI at scale, direct impact on velocity and quality, access to top AI tools, competitive salary, unlimited holiday, remote-first, flexible hours.

Apply: https://jobs.ashbyhq.com/fanvue.com/dcf1bcaf-a0af-4131-903c-...

Reference: Narcis Marincat