Francis | Senior Full-Stack Engineer | Full-Time | ONSITE Copenhagen, Denmark Stack keywords: Typescript, React+Tailwind, Node+Express, WebSockets, PostgreSQL.

We're building a SaaS tool for finance professionals that has the modelling flexibility of a traditional spreadsheet, but purpose-built for financial planning & analysis. This is not just another CRUD app - the spreadsheet engine and formula language is custom built.

We're looking for a senior engineer to keep up with customer demand.

Check full job post here: https://thehub.io/jobs/6891bc03043e0d7284301bed

francis.app

Sitewire | Full Stack Engineer | Full-Time | REMOTE (US-only) | https://sitewire.com

Learn more or apply at https://wellfound.com/l/2zf9K9 - I personally review every application, so just mention you found us on HN.

Sitewire is a simple yet powerful construction finance platform that helps lenders and institutional asset managers track project progress, automate work verification, and speed up payments. The company is functionally profitable and expanding 2-3x per year. We’re looking for an experienced and entrepreneurial full-stack engineer (senior or above) to help us achieve an ambitious growth plan. You will be a core member of the engineering team, working alongside peers with the support of a mature founding team expert in construction, mobile, and IoT.

Technologies: Ruby on Rails, Hotwire (Turbo / Stimulus), Tailwind, TypeScript, React, Postgres, Sidekiq. Experience with mobile, data engineering, machine learning, or 3D graphics is a plus.

Voltquant(https://www.voltquant.com/) is building an AI-powered platform for engineering firms, utilities, and infrastructure companies. We help teams process technical data more efficiently, automate complex workflows, and make informed decisions using AI.

We’re seeking engineers who want to build real-world AI tools that address industry challenges—working with data from large-scale infrastructure to ML-powered document intelligence.

Tech Stack: Next.js | React | TypeScript | Tailwind

Open Roles: • Front End Engineer (Hybrid, London) • (x1)

Interested in applying AI to built-world challenges? Email jobs at voltquant dot com with your CV and two examples of projects you’re most proud of.

Vendis | Senior Ruby on Rails Developer | REMOTE (EU preferred, US ok) | Full-time

• Post-MVP AI-powered B2B SaaS; serial founder-built & self-funded (pre-angel/VC), first customers onboarding – hiring employee #2. Modernizing a software category every company needs.

• Stack: Rails 8 · Hotwire (low-JS) · ViewComponents · Tailwind 4 · AWS · DynamoDB · OpenSearch · LLM APIs (zero legacy).

• You: 5+ yrs Rails, full-stack; non-relational DB + AI/LLM integration; autonomous builder & team player.

• Culture: tiny senior a-team, zero managers – you code or you sell. Values: Ownership · Pragmatism · Tempo · Kindness · No Ego.

• Comp: € 80-100 k base + € 20-25 k stock options (Delaware C-corp).

• Process: founder call → code walkthrough → 4 h remote pairing → decision in days. Apply: https://www.linkedin.com/jobs/view/4271296722/ or reply here with intro/CV + GitHub + LinkedIn.

Swayable | https://www.swayable.com/ | SF, NY, Remote | Full-Time

Swayable measures how content changes people's opinions. We apply a variety of sophisticated machine learning classification, regression, causal AI, and GenAI-based analyses to survey-based data we collect. Customers receive high-level, actionable data about different group's responses through an ever-expanding portfolio of web-based visualizations, reports, and natural language interfaces.

All positions support remote US work or SF/NY office.

- Senior Engineer: AI Applications. AI Applications Engineer that blends full stack software development expertise with agentic/multi-node workflow architectures. You will be responsible for creating and building our portfolio of LLM-based classification, reporting, and analysis applications. Stack: Python (langgraph, pandas, celery, flask, MCP), JavaScript (Vue.js, Node.js), MongoDB, GraphQL, and a variety of LLM providers.

- Senior Engineer: Full-stack Web. Full-stack web to build and enhance our core browser-based applications for building surveys, collecting responses, and visualizing results generated by our suite of sophisticated numerical and qualitative analyses. Stack: Vue 3 (Nuxt), Tailwind CSS, Node (Express), GraphQL, Mongoose, MongoDB, Cypress.

- Senior AI/ML Engineer: Scientific Computing. Blending Python software development expertise with scientific computing, machine learning, and AI experience to advance the state of the art analytics engine that powers our core product. Stack: Python (Numpy, Pandas, scikit-learn, Celery, Flask), machine learning (linear regression, casual AI, text classification), MongoDB, and GraphQL.

Postings are available at https://www.swayable.com/careers/ or free free to contact me (the hiring manager) at eng-jobs@swayable.com

*Maiven | Full-Stack Engineer & Energy Modeling Engineer | Remote (US) | Full-Time*

Maiven is the software platform automating home decarbonization. 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 two engineers:

- *Full-Stack Engineer* – NestJS, React, Tailwind, TypeScript, Python, Postgres, AWS, Lambdas. Someone who cares deeply about UX and moving fast while delighting the user.

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

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: Either email [jacqueline@askmaiven.com](mailto:jacqueline@askmaiven.com) or apply via Climatebase for the [Fullstack Engineer](https://climatebase.org/job/61149749/full-stack-engineer?for...) [1] or the [Energy Modeling Engineer](https://climatebase.org/job/61149748/energy-modeling-enginee...) [2]

[1] [https://climatebase.org/job/61149749/full-stack-engineer](https://climatebase.org/job/61149749/full-stack-engineer?for...)

[2] [https://climatebase.org/job/61149748/energy-modeling-enginee...](https://climatebase.org/job/61149748/energy-modeling-enginee...)