Rectangle | On-site Chicago, or US remote in SF and NY | Full-Time | Salary + Equity

We're looking to hire a dedicated full-stack engineer at Rectangle.

If you are (or know!) someone who has thought deeply about distributed coordination, have strong opinions on conflict resolution, or get excited about building systems that are resilient to crazy amounts of chaos, I'd love to talk to you!

Over the last few months we’ve been investing heavily in building our internal infrastructure to power automation, integration, and visibility across the supply chain. We’re rapidly onboarding new customers and are looking for an engineer who’s excited to build alongside them.

You’ll be working directly with customers, solving real-world problems, and scaling the solutions you build. The products you own end-to-end will coordinate billions of dollars of freight, and unlock real revenue and efficiency for leading tech-enabled logistics companies.

This is a great opportunity for someone who loves to operate 0 → 1 while also being directly involved in shaping our platform strategy as we keep stacking investments we’ve made into our infra layer.

Stack: Typescript, Go, Kafka, SQL, AWS

Email hn [@] rectanglehq.com or submit a POST request with X-Application-Key: FDE-CHALLENGE-01 to challenge.rectanglehq.com and see what happens :)

https://rectanglehq.com

Autokroma.com | C / ffmpeg / codecs / GPU / AI dev workflows | Full-time | HYBRID REMOTE-ONSITE | Porto / North of Portugal

We do audio video software : video editing plugins, web panels, GPU visual effects, encoders, decoders, AI assisted development & testing. All levels are welcome but be sure to make me understand what are your current capabilities and goals. You will work close to the code, user requests, whole UX in general, I try to minimize the layers between developers, products and final users. If any of those topics are of interest to you, and you're around Porto to meet me : send me an email, the first part of the email is "jobs" and after the @ the domain name. Tell me your story, what you're looking for in your life now, a previous bad work experience you'd like to avoid and a good work experience that inspires you for the future.

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Phosphor | NYC/Remote | Full Time | Founding Engineer | $150-225k + Equity

Phosphor builds recursively self-improving systems (via malleable software and natural language interfaces) to enable the efficient development and financing of the physical world (infrastructure, energy, real estate).

Our product is built around a powerful object model which combines document editors with proprietary programming languages for financial modeling, computable contracts, etc, in order to build one of the more unique RLHF feedback loops that we've seen to date.

A primary technical bet is that if we can productize version control properly, we can capture annotated "diffs" of user information with user-validated annotations. By doing so, we create path-dependence, which enables us to specify system-level goals for agents to solve for.

Our product is similar a combination of Linear and Wolfram, with components and objects that enable advanced financial modeling, legal/regulatory analysis, and geospatial analysis of infrastructure development opportunities.

We're venture-backed by one of the best deeptech funds in the market and are hiring for roles spanning product engineers, CRDT wizards, and compiler/calculation engine leads.

Job listings can be found at the bottom of phosphor.co.

Hardfin | Full-stack engineer | Denver metro, CO or Bay area, CA (REMOTE or ONSITE) | CA/CO ONLY | Full-time | 150k-180k salary (DOE)

Hardfin is a B2B software platform for equipment manufacturers that enables them to track their assets and manage projects for their hardware. We are looking to add another fullstack engineer that can wear a bit of a product hat and is comfortable with "figuring it out" as they build.

Short and transparent hiring process, 30 min intro call, 30 min tech screen, 30 min vision/product call, 2hr technical test, 45 min culture fit call, offer. No panels, no leet code questions.

Requirements: 5+ YoE, 3+ Go, 1+ Typescript, 6+ months of working with AI assisted IDE/tooling. Requirements are not firm, but you will be asked questions about Go and Typescript and it would be difficult to pass the tech screen without the experience.

IMPORTANT: - You must be located in CA or CO, this isn't negotiable; ideally you are in the Oakland/SF or Denver area. We do not provide relocation. - We do not have the ability to process or handle sponsorships at this time (visa's of any type) - you must be a citizen, permanent resident, or have work authorization that isn't tied to employment (IE refugee status).

See the full job rec/apply at https://wellfound.com/l/2bs5im

You can reach me directly at bweisbart -at- hardfin (.) com, please include "HN" in the email subject so I can prioritize a response to you. We respond to all candidates (no voids) as long as you meet the the eligibility requirements.

Imubit | Sr. Site Reliability Engineer (SRE) | Remote (USA) | Full-Time

At Imubit, we’re not just optimizing industrial processes - we’re redefining how entire industries operate. As the pioneer of Closed Loop AI Optimization (AIO), we are leading the charge in transforming refining, chemical, cement, and mineral mining plants with AI-driven automation. Our Optimizing Brain™ Solution puts the power of AI directly into the hands of engineers, enabling them to build and deploy their own multipurpose models to unlock new levels of efficiency, profitability, and sustainability.

I'm hiring for this position:

- Sr. Site Reliability Engineer: https://imubit.com/careers/job/?gh_jid=4085044008

E2B | SF (US) or Prague (CZ), both on-site | [Platform | Security | Distributed Systems | Sales] Engineer/DevRel Engineer | https://e2b.dev/careers

E2B is an open-source infra devtool that gives AI agents cloud computers that we call sandboxes.

We're Series A startup with 7+ figures revenue. We've raised over $32M and have customers like Perplexity, Hugging Face, Manus, X, MSFT, or Groq. We're growing double digits every month, have 5+ years of runway, and a full roadmap of exciting features to build.

I'd love to chat if you want to help us with some of the scaling challenges, DX, or new products!

Feel free to send me your projects to Email is hidden.

ResiQuantAI | San Francisco, CA | US Based | Resiquant.ai | Onsite, Fulltime

ResiQuant is a mission-driven startup building the future of property risk intelligence—where every building can be accurately assessed for disaster resilience, at scale. We’re solving one of the toughest problems in climate risk: the lack of reliable, standardized, and dynamic data on the built environment. Our work is critical in a world where wildfires, earthquakes, and hurricanes are escalating in frequency and impact. Empowering insurers, financial institutions, and asset managers, our AI-powered systems combine cutting-edge machine learning with deep structural engineering expertise. The result: precise, actionable insights that close critical data gaps and drive smarter decisions.

Backend Product Engineer: -Architect and maintain backend systems that support AI-driven property risk intelligence at enterprise scale - Own end-to-end development of backend features, from design through deployment - Design and implement scalable APIs, data pipelines, and model-integrated services to deliver real-time, high-reliability insights used by Fortune 500 insurers - Collaborate cross-functionally with engineering, product, and customer stakeholders to build and iterate on impactful features - Ensure backend systems are observable, reliable, performant, and ready for production at scale - Evaluate user and customer feedback to inform product iterations and backend improvements - Minimum of 3 years of backend engineering experience with ownership of production systems - Hands-on experience developing in modern backend stacks (Python experience is a plus) - BS or above in Computer Science/Engineering and at least three years of applicable industry experience

Forward Deployed Engineer: Act as the technical liaison between the company and enterprise insurance customers, leading engagements from initial discovery through full-scale implementation - Collaborate directly with underwriters, executives, and IT teams to deliver AI-driven solutions that transform risk assessment for wildfire, earthquake, and hurricane exposure - Architect and implement custom APIs, integrations, and automations that connect customer systems with ResiQuant’s platform - Travel to customer sites across the U.S. to conduct workshops, lead technical deployments, and ensure successful adoption of the platform - Train and onboard underwriter teams, supporting workflow integration and long-term platform usage - Serve as the voice of the customer, translating needs and feedback into product roadmap priorities - Develop internal tools and automations to streamline future implementations and scale delivery - Minimum of 3 years of software engineering or technical implementation experience, with strong communication and customer-facing skills - Hands-on development experience, particularly with APIs and systems integration (Python proficiency is a plus) - BS or above in Computer Science/Engineering and at least three years of relevant industry experience

Please send your resume to: Email is hidden

Clerq | Staff Software Engineer, ML Engineer | onsite 3 days (NYC) | https://clerq.io Clerq is a New York City based fintech startup building a next generation platform payments platform that delivers a seamless checkout experience for high-ticket transactions. By leveraging modern bank rails, the platform offers the conversion and UX benefits of cards with risk and money movement infrastructure purpose-built for large purchases. Clerq replaces outdated manual payment methods like cash, checks and wires and expensive card surcharges with a smooth, integrated solution that helps merchants convert more customers without sacrificing margins.

We have started with the $1T+ U.S. auto vertical, where our platform is growing rapidly and already powering payments for several of the most recognized brands in the industry including multiple Fortune 500 companies. With proven traction, the company has expanded into high-growth adjacencies including high-ticket e-commerce, private travel and powersports.

We currently have two open roles in Engineering and are looking for engineers excited to help bring high ticket payments into the 21st century:

- Staff Software Engineer to help build out + scale core payment automation stack

- ML Engineer / Data engineer to focus on payment risk modeling.

Stack: Python/Django, Remix React, AWS Comp: $180-220k + Equity

Email me at Email is hidden if you are interested in hearing more!

Baton | Product Designer Manager / Senior Software Engineer - Full Stack, Technical Lead / Senior Software Engineer - Infrastructure, Machine Learning | San Francisco, CA (Hybrid) | Full-Time

Baton (baton.io) is building software to automate the $800B+ freight industry. We're a small, fast-moving team inside Ryder (Fortune 500 logistics company), rethinking how freight moves with real-time visibility, automation, and AI.

- Product Designer Manager: https://job-boards.greenhouse.io/baton/jobs/4796615007

- Senior Software Engineer - Full Stack, Technical Lead: https://job-boards.greenhouse.io/baton/jobs/4623804007

- Senior Software Engineer - Infrastructure, Machine Learning: https://job-boards.greenhouse.io/baton/jobs/4870381007