Estuary | US-Based / Remote | Full-time – https://estuary.dev/ Estuary is a VC-backed, post–Series A startup powering right-time data replication and transform — from sub-second CDC replication to terabyte-scale OLAP data flows.

We’re open-source, developer-first, and focused on making data movement radically simpler across both our Platform and Applications layers.

We’re hiring for:

Senior & Staff Backend Engineers (Integrations)

5+ years backend experience; Go required, Rust a plus. Own core systems powering real-time data pipelines. Build complex API/database integrations, improve connector frameworks, and tackle deep challenges in performance, reliability, and developer experience.

Backend Engineer (Integrations) – 2–4 years of backend experience. Help expand and maintain our catalog of real-time data connectors to SaaS tools using Python. You’ll work closely with experienced engineers to build and optimize integrations with third-party systems, while deepening your skills in infrastructure and stream processing.

Solutions Engineer - Work with the founding team to help customers use Estuary effectively. Collaborate closely with engineering and product, shape how users integrate real-time data, and feed insights back into product development.

What we’re looking for: Engineers who care about building reliable, maintainable systems and enjoy working with complex APIs and data flows. We value curiosity, clear communication, and a willingness to learn.

Bonus points for experience with CDC tools, open source contributions, or fast-paced startups.

To apply: Email your resume to Email is hidden

Quidient | Software, Mobile, QA, IT, TPM | HYBRID (Columbia, MD) | Full-time | https://quidient.com/careers

About us:

The physical world is still largely unstructured. Quidient is building a new foundational category: Generalized (5D) Scene Reconstruction (GSR). Our API-first platform turns real-world environments into measurable, queryable digital assets—powering applications across defense, infrastructure, and spatial AI.

We work at the intersection of AI, physics-informed models, large scene/world models, and real-time 3D systems.

Open Roles: - Software Engineer, Full Stack (Product / Web) • Build polished web + desktop interfaces on top of our 5D reconstruction engine, including interactive 3D workflows and API-driven experiences.

- iOS Engineer (Opening Next Week) (Mobile / 3D / AR) • Build high-performance iOS applications for real-world capture and reconstruction using Swift, Metal, ARKit, and CoreML in compute-heavy, low-latency environments.

- Senior SDET (iOS / Performance / Automation) • Own quality and release readiness for iOS edge applications, leading automation, CI/CD, and deep performance profiling across CPU/GPU/memory/thermal constraints.

- IT Systems Administrator • Build and scale internal IT for a deep-tech company, supporting cloud identity, MDM, security posture, GPU-heavy engineering systems, and compliance-driven environments.

- Technical Project Manager (Product Development) • Keep complex, cross-disciplinary engineering work moving—owning sprint operations, roadmap hygiene, stakeholder alignment, and execution clarity alongside engineering leadership.

Team & Setup: Small, senior team. Real customers. Real physics. Hybrid roles based out of our Columbia, MD technology center. Company is profitable and doubling this year.

Layer Health | https://www.layerhealth.com/ Amazing (and no ego) engineering team: https://www.linkedin.com/company/layerhealth/people/ Location: BOSTON (Boston Common) or NYC (downtown) - hybrid in both locations; <<NO REMOTE>> Headcount: ~37 and growing Stack:React / Typescript / Python / GCP

Open Roles (all roles require a MINIMUM of 6 years of work experience): ML Infrastructure (Staff+) * Data Infrastructure Lead * ML Engineer * ML/Research Scientist (PhD's) * Security Engineer

We Offer: * competitive base salary + equity + great health/medical benefits * unlimited PTO * collaborative engineering-first culture

Layer Health was founded in 2023 by leading ML researchers from MIT and Harvard Medical School. We've built (and are live with multiple large health systems/hospitals) an ML product that scalably synthesizes patient medical records. Our LLM-powered platform is solving patient chart review - it dramatically accelerates clinical registry abstraction in areas ranging from surgery and cardiology, to oncology. Our long term vision is for our AI layer to safely transform patient care and minimize unnecessary heartbreak. Layer Health’s diverse founding team brings expertise across machine learning, UI/UX, large language models, and medicine.

Email me at Email is hidden for more info

Folio | Backend / Product Engineers | REMOTE (US) | Full-time | https://folio.co

Hotel procurement's a $400B industry still running on spreadsheets and phone calls (and faxes!). We're bringing world-class AI search, web automations, and payment infra to this massive space. Folio is a first-of-its-kind marketplace connecting hotels + restaurants with their hundreds of suppliers using our AI-driven concierge-buying, invoice processing, and agentic payments.

Open Roles:

Our 16-person team hails from Plaid, Square, Persona, Slack, and Cruise. We're fully-remote with a hub in San Francisco, NYC, and Durham, and we meet up quarterly at one of our 300+ hotel partners.

- Software Engineer, Product (Full Stack) • Build the marketplace and payments experience that hotel buyers and suppliers love: https://folio.co/jobs/software-engineer-fullstack

- Software Engineer, Backend • Scale our marketplace infrastructure, search, and payment systems: https://folio.co/jobs/software-engineer-backend

Tech Stack: Rails, React, TypeScript, PostgreSQL, AWS, Elasticsearch, DBT, Snowflake

We're at your service: https://folio.co/careers

Sentinel Defense Technologies | Remote (Global) | Full-time | Equity + Deferred Cash

We are building the world's first AI-powered civilian protection platform. Our mission is to provide military-grade threat intelligence directly to non-combatants in conflict zones (e.g., Ukraine, Middle East), enabling life-saving decisions during the critical first 72 hours of a crisis.

We are a Unfunded->Pre-Seed team looking for mission-driven builders who want to solve hard technical problems (GenAI multi-model verification, geospatial analytics, offline-first mobile apps) with immediate real-world impact.

*Open Roles (Founder-Level Commitment):* * *Full Stack Developer (System Core):* Python/Django + Frontend. Ship features weekly. * *Backend / DevOps:* CI/CD, secrets management, high-availability architecture. * *AI / ML Systems Engineer:* Multi-model synthesis (Gemini), refusal logic, drift evaluation. * *OSINT / Intelligence Lead:* Define trust tiers, escalation taxonomy. * *Security & Risk Officer:* Threat modeling, audit logging, incident response.

*Compensation (Transparent):* * *Phase 1 (Now):* Sweat Equity only. * *Phase 2 (Pre-Funding):* Equity + Deferred Cash (Contractually tracked, paid on funding). * *Phase 3 (Post-Funding):* Competitive Salary + Equity. * Note: Strategy & QA roles are Equity Only.

*Tech Stack:* Python, Django, Flutter, MongoDB, Typescript, Dart, HTML, CSS, Shell

*IDE's & AI Models* Antigravity (Opus & Gemini)

*To Apply:* Visit https://sentinelcivilianriskanalysis.netlify.app/#join-usema... and then email Email is hidden with your resume/GitHub and a brief note on what you'd ship in week 1.

AppFolio | Staff Software Engineer, Platform Communications | REMOTE (US), Santa Barbara, San Diego, Dallas, Denver, Atlanta, Chicago | Full-time

Interested in real estate and proptech? The Platform Communications team at AppFolio (NASDAQ: APPF) is looking for a Staff Software Engineer who will be in charge of scaling up our SMS, email, in-app chat and voice offerings. Learn more and apply here: https://www.appfolio.com/open-roles?p=job/olwaxfw8

Stack: Ruby on Rails, TypeScript, JavaScript, React All roles: https://www.appfolio.com/open-roles

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Upway | Software Engineers (All levels), Senior Product Designer, Senior Product Managers | Full-time | Paris (ONSITE)

We’re building the biggest second-hand bike shop in the world.

Upway is the leading marketplace for refurbished e-bikes across Europe and the United States.

In 3 years, we grew from 0 to $200M GMV. The tech team grew from a small senior core to ~12 engineers in 2025, and we plan to grow to ~30 engineers in 2026. We also raised a $60M Series C at the end of last year to support the next phase of the company.

This is not a SaaS. We operate warehouses, handle real inventory, and build software that connects logistics, product, and marketplace dynamics at scale.

We’re looking for engineers and product people who like tech as much as business, people who want ownership, enjoy making product and business trade-offs, and care about outcomes, not just systems.

We work with a Shape Up–inspired methodology that gives teams real ownership: shaping problems, building solutions, shipping, and learning from real-world impact.

Stack: TypeScript | NestJS | React | Shopify | PostgreSQL | GCP

Why it’s a great time to join:

- The organization is switching gears: bigger ambitions, broader scope, more responsibility.

- The challenges are growing with the team: product, marketplace, and operational complexity.

- High ownership environment where engineers influence technical and business decisions.

- Paris on purpose: at our current pace, working in person is a real advantage.

Learn more:

- Tech & Product subjects we’re working on: https://like-piper-15f.notion.site/tech

- Open roles: https://careers.upway.shop/

- Contact our tech recruiter: https://www.linkedin.com/in/maeg-horeau-28445b72/

Sequent Tech | Senior Fullstack Engineer, Senior DevOps Engineer | REMOTE (Global) | Full-time | sequentech.io

Sequent builds cryptographically secure online voting infrastructure used in 200+ real elections across multiple countries. We're a fully remote team working on an open-source platform combining Rust, TypeScript, and modern DevOps. We handle End-to-end encrypted voting, cryptographic mixnets, and tamper-evident logging.

Tech Stack: Rust, TypeScript/React, WebAssembly, GraphQL, PostgreSQL, Kubernetes, Keycloak, ImmuDB

Open Roles:

Senior Fullstack Engineer (Rust + TypeScript/React) Senior DevOps Engineer (Kubernetes, Infrastructure as Code)

Reach out: Email is hidden

Kyber | Low-level Developers and Sales | Paris area (hybrid) and Remote in Europe | Full-time | kyber.media

Kyber is an open-source SDK and platform to control remote machines, from Remote Desktop to Robots Teleoperation/Teleobservation.

Kyber is a multi-stream and multi-actuator transport in extremely-low latency, over Quic; it encloses the server, the client and the protocol.

One could use Kyber to control robots, drones, desktop, servers in the cloud or just remote rendering of interactive 3D programs. Kyber is done for Remote RealTime, where every millisecond matters.

Kyber is developed by engineers from the VLC and FFmpeg community, and we code in Rust, in C and in assembly. We have some development in Go too.

We're a quite technical team, but cool to work with.

Contact: jobs -- at -- kyber.media (subject: “HN job”)