Delfina provides a leading pregnancy care data platform to improve maternal and child health outcomes. Our motivating challenge is the fact that in the United States, healthcare outcomes for pregnancy are significantly worse than in other similarly developed countries. We believe our technology-enabled solutions will help doctors better scale to better use data and in the end, deliver better care to their patients. We are looking for people who believe in our mission to join our team!

We are looking for both junior and mid level backend software engineers. It will help if you experience with: Python, Postgres, GCP, Beam, Spark, dbt, BigQuery, or similar

Experience in healthtech, pregnancy care, machine learning, and design are all valuable as well!

Find the posting here, which include some details on comp & benefits:

https://www.delfina.com/careers

EnergyCAP is the leading energy and sustainability platform, helping organizations take control of their utility data, reduce costs, and achieve sustainability goals. With powerful analytics, automated bill management, and seamless integrations, EnergyCAP transforms complex data into actionable insights. From tracking energy usage and optimizing efficiency to simplifying carbon accounting and financial reporting, our platform provides the tools needed to make smarter decisions. Trusted by governments, universities, healthcare systems, and businesses, EnergyCAP helps organizations streamline operations, improve accountability, and drive meaningful sustainability progress.

Check out our career page here: https://www.energycap.com/careers

Hi, at Deutsche Börse, we’re re-building an energy market from the ground up, and we’re looking for a Kotlin developer to join our team. Or someone willing to accept challenge as a Kotlin dev.

Our solution is based around Kotlin Flow and the Raft protocol. This isn’t your typical backend role. There's no Spring, no dependency injection, just pure programming. We take inspiration from the Agile Manifesto with touch of XP. We put big emphasis on close collaboration in our Prague office and don't do Scrum. We put big emphasis on automation which means no manual testers.

If this sounds interesting, feel free to reach out to me at matej-hiring@vasilevski.cz for more details. Here’s the full job description: https://careers.deutsche-boerse.com/offer/kotlin-jvm-develop... Looking forward to hearing from you!

We are a software consulting company based in Northern Virginia.

Our Website: https://www.solutionstreet.com/

Current Opportunities: * Senior Software Engineer - Python & DevOps : (Remote) Focusing on data management\workflows, infrastructure as code, and CICD pipelines. Role requires a deep understanding of technologies including Python, Django, AWS, Terraform.

* Software Development Engineer in Test: (Remote) 7+ years experience in creating robust and scalable test automation frameworks for web applications. Must have proficiency in using Cypress testing framework and be comfortable coding in Javascript. Preferred experience with leading a project or QA Automation team.

* Senior .NET Software Engineer: (On-Site Reston, Virginia) We're seeking Senior software developers with a strong background in software design and development having worked on multiple projects over their career with the following skills: .NET Core/C#; ASP.NET Web API; Angular, React or other Javascript framework; Entity Framework; SQL and SQL Server. Preferred skills: Experience with Webforms a plus. Experience with Cloud services like Azure or AWS.

* (Upcoming Projects) Lead React and Node.Js Engineer: (Remote) This is a preview, we do not currently have an active React role, but our business development team is in early stages of forming a project with a client partner that would be seeking a lead developer with Node/React/Postgres experience.

Interested? Send your resume (Please mention Hacker News in subject line) to: Cristina Little, Recruiting Coordinator - Email: clittle@solutionstreet.com

We’re looking for Python backend engineers to work on a trustless supercluster of performance-proofed, GPU-enabled, sandboxed Docker container runners controlled by truly decentralized algorithms (not just PAXOS or RAFT).

Wow, that was a mouthful...

If you found it interesting, join Reef Technologies and tackle complex technical challenges like this on your own terms:

- Contribute from wherever you like - we are fully remote

- Set your own time commitment, as long as it’s at least 30h per week

- See how we work in our handbook: github.com/reef-technologies/handbook

- Influence the way we operate through our Sociocracy 3.0 decision-making process

Salary on a B2B contract:

- $45–$70 USD or 190–295 PLN per hour

- $7,560–$11,760 USD or 31,920–49,560 PLN per month if you work 40 hours per week (most of us work a bit less)

- Flexible work schedule (as measured with a time tracker)

- Rates are automatically adjusted for inflation twice a year

We're looking for someone with 5+ years of programming experience, including at least one year with Python (open source and significant personal projects count!).

So, what do you think? You don't even need a CV - just go to https://careers.reef.pl/?utm_source=hackernews and shoot a few quick commands to apply.

Contact: Email: hiring@reef.pl

Company Website: https://reef-technologies.com/

We license data to leading Fortune 500 restaurants. Data is the new oil, it serves as a vital input into the ML and data analytics pipelines that direct company strategies. Companies with a firm understanding of their internal data necessarily want to expand their understanding of their market with external datasets, that's where Spice Data comes in.

We're a small and nimble engineering team with lots of back end work that we could use some help with. We cover both sourcing (web crawling), cleaning, and formatting of large (150M+ data points a month) datasets. We'd love to talk with you if you have experience with either building/maintaining data pipelines or working on web crawling/scraping. Familiarity with unix like systems is essential as a lot of our tooling is terminal based.

Tech stack: Python, Linux, PostgreSQL, Dagster

Benefits

- Lunch provided when in office

- Unlimited PTO

- 401k

- Company paid Platinum PPO health and comparable dental & vision insurance

- Salary $100k-150k Software Engineer, $160-220k Sr Software Engineer

- Competitive equity (0.25-3% depending on position/salary)

Software Engineer: https://www.ycombinator.com/companies/spice-data/jobs/TijA35...

Sr Software Engineer: https://www.ycombinator.com/companies/spice-data/jobs/f6Bueh...

For more details, take a look here: https://www.linkedin.com/jobs/view/4199877025

Help us keep water clean. Literally. Join this Techstars backed startup. Nyad is on a mission to modernise how the world manages industrial wastewater. Across thousands of factories and treatment plants, operators are manually inspecting microbes under microscopes making critical decisions for billions of bacteria that clean our water. When things go wrong, they really go wrong: bugs die, pollution spikes, and companies spend big on emergency chemicals. We’re building software tools that empower operators with real-time insights combining image-based analysis, process recommendations, and AI-driven models of microbial health. It’s biology meets machine learning, in one of the least digitised but most essential sectors on Earth.

Hi HN! I’m Antoine, Head of Research at Castle. We’re a YC-backed Series A startup helping companies like Canva, Atlassian, and Rockstar Games fight fraud and abuse. We're building modern, AI-powered bot detection and abuse prevention tech, with a focus on real-time protection and behavioral intelligence. We’re a small, fast-moving team looking to add two technical roles:

Senior ML Engineer – Fraud & Bot Detection You'll work on real-time ML pipelines, anomaly detection, and adversarial ML techniques to stop bots and malicious actors. We’re combining traditional fraud signals with modern AI—LLMs, behavioral clustering, and vector-based search—to stay ahead of attackers. You’ll own models end to end and deploy quickly, with direct access to rich, structured behavioral and fingerprinting data. Ideal for someone with strong experience in the anti-fraud/anti-bot field who loves cutting-edge ML and wants immediate impact.

Senior Detection Engine Engineer (R&D) You’ll build and scale the core infrastructure behind our detection logic—rule engines, fingerprinting pipelines, and high-speed signal ingestion. We’re integrating AI-driven detection and auto-adaptive logic that reacts in real time. If you enjoy real-time systems, security, and automation, this is a highly technical role that’s at the core of our detection stack. Perfect if you’ve worked in security, data pipelines, or real-time analytics and want to outsmart fraudsters.

We pay US salaries globally | Fully remote from Europe/EMEA timezone | Flexible hours | Unlimited PTO | Paid parental leave We're actively hiring and committed to responding to every qualified applicant.

Drop us a line: antoine.vastel@castle.io

Atomic Tessellator is building the world's fastest, most comprehensive materials design web platform. We're giving materials scientists the ability to create and test different permutations of atomic structures, and evaluate every known material property, with preconfigured computing environments.

We're seeking a front end developer with Three.js experience to lead our platform UI development (Vue.js). You'll also be solving the technical challenge of rendering complex atomistic simulations in a physically accurate, visually interpretable, and performant way.

We're a tight, global team of 5 with a hacker mentality. We're AI-native, value taste, have audacious goals, and move at unreal speeds. We take pride in being generalists.

Interested or have questions? Please send through your CV to daniel+cvs@atomictessellator.com :)

Cactus is a strategy, design, and engineering firm that builds physical and digital products for some of the world's leading healthcare clinics. Fully remote with teams based in the US and Brazil, we're hiring for a variety of software engineering roles (https://www.cactus.is/careers).

- Backend and Fullstack: Python and JS, SQL/PostgreSQL and NoSQL tools (GCP experience a plus)

- iOS and Android: Swift and Kotlin/Java

- Frontend: React, JS, and a variety of data viz and interactive libraries

- Engineering Managers: to lead our client projects and teams

Email careers@cactus.is with your name, github/code samples, and resume or LinkedIn. It's a plus but not required to have past experience working with healthcare tools and standards like EMRs, HIEs, HIPAA, FHIR, interoperability, etc.