Return (https://return.energy) is hiring a software engineer who will work on platforms that accelerate the transition to carbon-free energy. Return’s main activity is building and operating industrial-size Battery Energy Storage Systems. Our operations are located in the Netherlands, Germany, Belgium, and Spain. You will be making a measurable (country-level) impact on the transition to renewable energy. Return recently raised €300M to support its growth.
While we employ over 100 people, Return’s technical team is still small (15 people). Our platform automates processes in energy storage, monitoring, market optimization, sales, project management, procurement, construction, and customer service.
During the first three years of operation, we laid the foundation for our platforms, and we are ready to scale up. This is why we are looking for an experienced software engineer.
You will be working on internal tools that support our business departments (origination, development, construction, operation, and general). Our tech stack is straightforward: Postgres, Ruby on Rails 8, Turbo, Stimulus, and Tailwind. We tend to keep meetings to a minimum in order to provide at least five hours of uninterrupted coding time per day. We practice code reviews and apply automated and manual testing. The platform is often deployed multiple times per day.
We’re very much open to remote work as long as you live in the EU. Our hiring process is swift but thorough: a 30-minute call to get acquainted and discuss financials, one or more technical interviews, and a paid visit to Amsterdam to meet the team.
The tech team members have co-founded several companies and have experience with remote development teams since 2008. They will personally help you through most of the recruiting process (there is no recruiter involved).
Apply here: https://jobs.polymer.co/return/39294 (EU residents ONLY)
Root uses technology to reimagine auto insurance — better pricing, better experience. Our engineering team builds a flexible platform where product designers and quantitative scientists can rapidly test, deploy, and iterate.
The Partner Activation team is hiring a Senior Software Engineer experienced with Ruby on Rails and API design in an enterprise setting. We power Root's embedded partnerships (Carvana, Experian, Toyota, Hyundai, and more) and you can see more of what we build here: https://root-bind-api.readme.io
This team sits at the intersection of multiple internal teams and external partners, mostly working on greenfield projects that bring modern tooling to legacy integrators. As the team's scope has grown, we're adding a dedicated engineer to own this work long-term. You'll coordinate across teams and with non-engineers regularly, so clear communication matters as much as technical chops. We're also exploring AI for integration-facing products (external dashboards, support tools, intake management) to reduce manual engineering overhead in our growth pipeline.
Open roles:
- Senior Software Engineer: https://ats.rippling.com/joinroot/jobs/125eb9e1-6121-4455-8b...
- Technical Services Engineer (partner-facing, non-IC): https://ats.rippling.com/joinroot/jobs/0e51f79d-07ef-47cf-93...
If either role seems like a good fit, mention that {{my username}} referred you via HN so I can review your application. You can also reach me on LinkedIn: {{my username}}-610b2591.
We are a series B health tech and data company building software for large non-profit health systems to grow patient volumes, connect patients with the care they need, and raise money from grateful patients.
We offer the industry leading grateful patient web app that allows health systems stand up highly integrated web sites quickly and easily to collect stories and feed donor pipeline development.
We're a 30-person team, spread between Washington, DC, New York City, Philadelphia, and Vancouver, BC. We reached $4MM+ annual revenue before raising any outside capital.
We're looking for a mid to senior full stack software engineer generalist who is eager to manage their own product, likes to build quickly, and is focused on understanding the customer and solving their problems. You will have ownership and autonomy with minimal meetings. We use ruby, rails, javascript, postgres, aws, docker.
I'm Arif - reach out if this sounds interesting arif@digitalhealthstrategies.com.
I’m the founder, trying to do “enlightened business.” We are a people-first, fully-remote (but some clients offer onsite…), boutique indie tech agency – building a team of talented, high integrity, and community-minded individuals, first, then building businesses around them, second. Our leadership staff are ex-Fortune 100; everybody touches code. Notable recent projects: internal tools for Anduril, and voltagepark.com.
We’re currently especially seeking:
Full-Stack Software Engineers (Typescript/Javascript, React, NextJS, Ruby on Rails; Python; Devops, and third-party API integrations)
(Check back soon; more roles for at least QA Engineers, ML/AI, and DevOps posting later in March.)
Please apply using this Google Form: https://forms.gle/Bv5zVjQDjgaLWqSp7. Applicants who submit before March 15 will typically receive a reply by March 22. Tier3 roles are typically 5-10 y/o/e with $150-$180k annual total comp. Tier4 roles are 11-20 y/o/e, $215-$260k annual total comp. Higher tiers exist, and we welcome exceptional applications.
Substantial is a technology consulting company. I'm looking to add someone to my team working with a long-time client on legal technology. We're a serious, collaborative team working in what we refer to as a Lean/post-agile way. We're looking for someone with 10+ years of experience, ideally in both the front end and the back end.
Technology: Ruby, Rails, Event Sourcing, JavaScript, Stimulus/Turbo Practices: Collaborative development (pairing, mobbing), TDD, end-to-end ownership, UI/UX design, user interviewing, etc.
If you'd like to learn more about how we work, I have several articles on the subject: https://github.com/aaronjensen/software-development/
Reach out to me directly if you are interested: aaron [at] substantial.com
Tangible Materials helps the construction industry to make better decisions around building materials. This means using less and better materials. We use AI to parse very complex construction documents to estimate quantities, track design decisions and detect over-design.
In this role, you'll help build the next version of our core technology by creating an agentic takeoff system.
Stack: Ruby, Rails, Typescript, React, Postgres, Redis.
https://careers.tangiblematerials.com/jobs/cad58c98-2666-466...
No visa sponsorship at this time
Newbuilds is hiring a Senior Ruby on Rails Developer to help scale a widely used proptech marketing platform, a Norway-based proptech company powering automated campaigns and data-driven workflows across 17+ countries.
You’ll work on backend architecture, improve performance and scalability, build integrations with external APIs/CRMs, and influence technical direction with ownership over your code. This role is remote-first with flexible work and competitive senior-level compensation.
Remote (EU timezone friendly) | We work via B2B, or employment in Norway or Germany
Modern stack: PostgreSQL, Sidekiq, RabbitMQ, AWS, Docker, GraphQL
Join a low-ego engineering team with real product impact
Apply or share with someone who’d love working on complex backend challenges: https://careers.staffer.ai/jobs/7247377-remote-senior-ruby-o...
We are hiring experienced Software Engineers to help accelerate delivery of AI solutions at our Energy company. We're looking for full-stack experience, multi-agent workflows, context engineering, agentic development.
Proficiency in Python, Ruby, SQL, JavaScript, frameworks (Rails, Django, Flask/Dash, etc.), AI (OpenAI API, Agno, LangChain, vector stores, RAG pipelines, etc.).
Full ownership of end‑to‑end systems - from problem framing through production - working directly with the team, and our stakeholders across the business on problems that matter.
Reach out through link in bio or apply through the link. No recruiters please.
Empire Flippers is a true global-remote company with travel in our DNA and employees scattered across 5 continents and all sorts of countries. Since I joined 6 years ago, I've personally been to India, the US, Brazil, Ecuador, Colombia, Mexico, the Philippines, China, Japan, Thailand, the UAE, all while working remotely and coding our Ruby on Rails + React app. More about us here: https://empireflippers.com/about-us
Though not as well known in the Hacker News / venture-backed startups sphere, Empire Flippers is widely considered the #1 marketplace for buying and selling online businesses in the 5 to 8 figure USD range.
Think of businesses like --- that recipe site you landed on as the first result when you googled "best chicken tikka masala recipe". Or the Amazon FBA seller whose product you purchased when shopping for "Widget XYZ" (with Amazon FBA, these ecommerce businesses never touch inventory and so it's a fully online business).
Turns out these type of businesses may be earning 10s of thousands of dollars per month in profit (or more!) and when the (often first time) founder is ready to sell, Empire Flippers is the #1 place to do it safely, securely and at a fair market price.
Before I joined Empire Flippers I only had a peripheral understanding of this space, but now that I've been steeped in this industry I can say that this "mini M&A" world is just as exciting as the high-flying unicorns (and decacorns) that we read about daily on Hacker News.
The company is hiring for a few different positions (both technical & non-technical), all of which can be found here: https://empireflippers.com/careers
But in particular, I'm hiring a Ruby on Rails developer to help me continue to build out new features in our Platform, both for customers and to help run our (very extensive) internal operations of vetting incoming businesses, facilitating their sale, and migrating them to the new owner after they've been purchased.
That job ad can be found here: https://empireflippers.com/career/ruby-on-rails-developer/
As mentioned, we are a global-remote company that hires people of all nationalities located in any country in the world.
Hope to see your application soon, and with any questions feel free to email me (Ben) at beng at empireflippers.com
I'm Mark, the technical co-founder and CTO at Goody. We're building a gifting product that every business can use to recognize employees, retain customers, and accelerate sales. Despite being something everyone does, gifting is one of the areas of commerce yet to be disrupted, and we're working on building the best and most delightful product in this space.
Our product is used by Google, Stripe, Anthropic, Meta, NBCUniversal, Notion, and others, and we also offer a developer API for commerce. Tech stack is Ruby + React + TypeScript, though we're flexible on backend language if you know Python or Node.js better. All roles are full-stack.
We're coming off of a big year and planning for scale in 2026. We have a few new roles to accelerate our growth.
• Staff Software Engineer ($200–250K) — for those who ship at a startup pace and have a great eye for detail
• Senior Software Engineer, Customer Engineering ($150–200K) — if you like to hear a customer request in the morning and tell them it’s shipped in the afternoon. US and Canada only for this one
• Senior Software Engineer, Growth ($150–200K) — be the engineer who has the most direct impact on our growth
We're looking for people who have great startup energy, want to win, and bring great vibes to our tight-knit team.
My email is open for any questions: mark@ongoody.com
Tech: Clojure, FoundationDB, Bazel, CLJS, Svelte
https://jobs.ashbyhq.com/griffin/c8eaae48-e84f-4dae-8c34-099...
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.
We also have a lot of exciting projects right now for AI/Agent workflows - basically an agent that can auto-remediate cost related issues on behalf of our customers.
We're a well funded Series A company and [backed by a16z, Scale venture partners and founders of Cloudflare, DigitalOcean and Segment]. The company is between 50-75 people today and scaling up quickly.
We're headquartered in NYC but US-remote friendly (sorry, we can't handle international at this time).
Website: https://vantage.sh/ Learn More: https://www.vantage.sh/careers
We're a Dental Support Organization running 59 practices across TX/OK/CO/MO/IA/NE/TN/AZ. The unsexy industry description hides what's actually an interesting technical role: a small dev team with real ownership, pushing hard on automation and AI to make dental operations actually work well.
Stack is primarily Rails 7.1 (Hotwire+Stimulus.js), with some React/Electron, C# .NET (OpenDental), and Go — all on AWS.
You'd be joining a tight team where developers own problems end-to-end: from understanding why a billing workflow breaks down, to designing the fix, to shipping it. The domain is surprisingly broad — patient communication, PMS integration, payroll, clinical workflows — and there's no shortage of genuinely novel problems once you learn the business.
Good fit if you like: stable company, small team, broad latitude, and work that visibly matters to the people using it. Not a fit if you need a large eng org — but there's plenty of greenfield work as we're still actively building new features, not just maintaining legacy code.
Drop me a line: dhanson [at] apexdp.com
CareMessage is a healthcare technology nonprofit that powers patient communication for 400+ safety-net healthcare organizations — FQHCs, free clinics, and tribal health centers serving low-income and underserved populations.
You will lead the technical direction of our messaging platform, the system behind every SMS, voice call, and multimedia message we deliver. You will design delivery pipelines, build consent management workflows, architect Twilio integration layers, and handle the sharp edges that come with messaging at scale: retry logic, opt-out compliance (TCPA, A2P 10DLC), delivery optimization across carriers, and AI-driven message categorization.
You'll likely thrive here if you:
- Have 5+ years building and scaling backend systems - Are strong in Ruby on Rails and Javascript with solid SQL chops
- Enjoy owning complex features end-to-end, from design through production support
- Think in terms of edge cases, failure modes, and delivery guarantees
- Want to mentor other engineers and shape technical direction
- Care about building infrastructure that has direct impact on patient outcomes
This is a senior role with shared team lead responsibilities. Small, mission-driven team with meaningful ownership. Equitable pay regardless of location.
Details & Apply: https://jobs.lever.co/caremessage/7b8afcbe-f296-4be6-bbd5-c5...
SerpApi is the leading API to scrape and parse search engine results. We deeply support Google, Google Maps, Google Images, Bing, Baidu, and a lot more.
Our current stack is Ruby, Rails, MongoDB, and React.JS. We are looking for more Junior and Senior FullStack Engineers.
We have an awesome work environment: We are a remote first company (before Covid!). We do continuous integration, continuous deployments, code reviews, code pairings, profit sharing, and most of communication is async via GitHub.
We value super strongly transparency, do open books, have a public roadmap, and contribute to the EFF.
Apply at: https://serpapi.com/careers
Role: Fully own our engineering and infrastructure teams, keep FetLife fast and reliable for over 12 million members, and free the rest of the leadership team to focus on product and growth.
How to Apply: Email jointheteam+hoei+hn@fetlife.com with a brief introduction, tell us about the impact you have personally made on an engineering or infrastructure team you have led, and LinkedIn or resume (PDF).
--- FetLife | Senior DevOps Engineer | Full-Time | Remote | 115k - 180k USD - https://fetlife.com/jobs/devops-engineer
Role: Develop and implement infrastructure upgrades, database tuning, Kubernetes and Helm orchestration, monitoring, and security. Help maintain and improve our large-scale Rails monolith, including CI/CD. Participate in on-call rotation and help automate daily DevOps tasks.
How to apply: Email jointheteam+do+hn@fetlife.com with a brief introduction, 2–3 favorite projects, GitHub/GitLab link, and LinkedIn profile or resume (PDF).
---
Stack: MySQL/PostgreSQL, ScyllaDB, Redis, ElasticSearch, Terraform, Google Cloud, DataDog and more.
Applications: Rails, Vue.js/Typescript, Rust
Perks: Paid time off (2 weeks vacation, 5 statutory holidays, 2 weeks at Christmas, 4-day summer workweeks), annual company retreat, anniversary gift ($200/year), monthly music subscription reimbursement, fully paid maternity & paternity leave.