Founding Engineer (Warsaw, full-time, in-office) Elastics is building an AI-native operating system for trading - deterministic agents, live data, portfolio management and execution across prediction markets, crypto, and beyond. We are Pre-Seed funded, working with our first clients, and need a Founding Engineer to accelerate building core product infrastructure. Responsibilities: Build and own our agent orchestration & runtime engine (async, distributed systems) Deploy and scale services on Azure (Docker, CI/CD, monitoring) Connect to exchanges and data sources (API/websocket integration, streaming) Implement portfolio and risk calculations (PnL, positions, Greeks, risk metrics) Implement market discovery dashboards on our platform Requirements: 5+ years of backend experience (Python, distributed systems, financial data pipelines) Comfort with Docker, Redis/Kafka, PostgreSQL Strong C++ experience Interest in financial markets and trading Startup mindset: you can ship, own, and iterate fast Warsaw-based (in-office) or willing to relocate Fluency in English - our work and clients are international Bachelor's or Master's degree in Computer Science, Mathematics, or a related field Offer: $5,000/month starting salary (B2B) + meaningful equity (true founding role) Work at the forefront of financial and AI innovation Work directly with experienced math, quant and product founders Exposure to top global hedge funds, exchanges and VCs

Send your resume to contact@elastics.ai with HN who’s hiring in the title

KSC Trading | Remote | Full-Time | Senior Backend Software Engineer | $150k to $200k USD

KSC Trading is a propietary algorithmic trading firm founded in 2020. The company creates software to engage in automated trading in sports and prediction markets. It has been profitable since the first year of inception, and has significant and clear growth available. The initial focus has been on statistical arbitrage and liquidity provision.

The role would include maintaining and expanding the trading infrastructure. Example tasks would be integrating new exchanges, optimizing backtest speed/cost, integrating a new data source into backtesting, tracking production trade latency, etc. Current tech stack is based on Java, Google Cloud Platform, and Postgres. The team remains very small, and you would be working very closely with the founder.

Location: Remote with at least 4 hours overlap with US east coast working hours.

The company currently donates 20% of its profits. To apply reach out at hiring@ksctrading.com with your resume.

Erdos Miller | Data Wrangler (Part-time → Full-time growth) | Remote (US preferred, flexible otherwise)

We build Measurement While Drilling (MWD) equipment — and we love it. That passion helped us capture the majority of the North American oil & gas market, and now it’s fueling our geothermal innovation, building underground navigation systems for the next generation of clean energy.

We’re now looking for a Data Wrangler to help us make smarter, faster decisions with our data. This role blends data engineering and data science: wrangling quirky file formats, structuring messy datasets, and turning it all into live tools that guide company strategy. Starts part-time with the opportunity to grow into a full-time, career-defining role. What you’ll do

Partner with the CEO + stakeholders to translate business needs into pipelines, dashboards, and tools. Build ETL pipelines, write parsers for proprietary formats, and maintain relational databases (PostgreSQL, MySQL). Create interactive dashboards/apps with Dash, Streamlit, or similar (we avoid Tableau/Excel hell). Deliver insights via live web apps where data isn’t static — it’s explorable. Tech we use Python, SQL (PostgreSQL/MySQL), S3, modal.com. Bonus: React/web dev experience to shape customer-facing real-time tools. Why you’ll like it here You’ll own projects end-to-end, avoid over-engineering (no Kubernetes, no Airflow — just the right tools), and directly influence decisions. As our company and data needs grow, so does your role. If this sounds fun, email ken@erdosmiller.com with your background and what excites you about wrangling data.

Clutch https://www.clutchapp.io - building future of padel with AI cameras | Fullstack Engineer, Head of Product Design, Hardware Engineer | Remote (our team is spread across GMT -4/+2/+8 timezones) | Full-time

We are Clutch, building an automated videographer and coaching experience for padel players. We are small but quickly-growing startup with cameras in over 30 clubs around the world. We are hiring for three key positions to enhance our app and our self-designed camera.

Fullstack Engineer: Frontend(Mobile)-heavy position. Expertise in React Native, PostgreSQL, Amazon lambdas or similar, Amazon s3 or similar. Experience with UI design is a big plus.

Head of Product Design: Expertise in product analytics, modern design tools and design systems. Strong record leading end-to-end design for digital products.

Hardware Engineer: Expertise in embedded systems (primarily with SoCs, e.g. RPi or Jetson Nano), video processing and 3D modelling.

For all roles, experience in sports tech or passion for racket sports is a big plus.

Contacts: Kirill Paramonov (CTO) kirill[at]clutchapp[dot]io, Kári Gunnarsson (CEO) kari[at]clutchapp[dot]io

Trustle | Senior Backend Engineer | Remote (US) | $150k-$200k + equity

Early-stage startup building cloud access management for Zero Standing Privileges through just-in-time access and intelligent entitlement management.

You'll: Design intelligent scheduling engines and data pipelines for just-in-time access across AWS/GCP/Azure/SaaS platforms. Build scalable integration pipelines connecting dozens of cloud providers and enterprise tools. Architect data models mapping complex permission relationships across multi-cloud environments. Ship fast with AI tools while maintaining quality. Direct impact on product direction and technical strategy.

You have: Strong Python/backend, cloud platforms experience, shipped complex systems, Postgres/data modeling/ELT pipelines at scale, early-stage mindset, strong opinions loosely held.

Bonus: FastAPI/Pydantic, deep IAM/security knowledge, BigQuery, Kubernetes.

Why us: Meaningful equity, direct product influence, remote-first, senior team where your voice matters. careers@trustle.com | https://trustle.com

We’re hiring across AI, infra, engineering & product marketing

1. Sr Product Marketing Manager (Stealth AI Time) – San Francisco (Hybrid, relo ok) Own category creation, positioning & narrative for AI-driven timekeeping. Lead GTM + product launches. 7+ yrs B2B SaaS PMM. $120K–$220K + equity. No visa.

2. Sr Fullstack Developer – Remote (B2B, EU pref) Frontend-heavy (TypeScript/React/Vue/Angular), backend Python/Django. Build scalable, high-perf DOM + rendering systems. 7+ yrs SWE. Contract, gross comp TBD.

3. Founding Engineer (FE/FS) @ Yarn (YC-backed) – NYC onsite only React + Python + TypeScript, WebGL shaders, AI video pipelines. 4+ yrs SWE. $170K–$225K + 0.75–1.25% equity. No remote/hybrid.

4. Fullstack SWE @ Thrv – Tiburon/SF onsite Next.js/TypeScript, LLM/AI apps (Vercel AI SDK), Postgres, Drizzle ORM. $150K–$250K + equity. Visa for exceptional candidates.

5. Platform Engineer (AI Infra) – NYC onsite, US citizens only Build infra for Olympus & Athena AI. Python (FastAPI), Docker/K8s, AWS GovCloud, on-prem deployments. $200K–$275K + equity.

6. Forward Deployed Engineer – San Francisco onsite 2–5 yrs SWE, startup/high-bar exp. Customer-facing coding & deployments. Work trial (3 days). $150K–$220K. Visa available.

Apply: bayonle.afolabi@hire1.email (state role).

Kombo | Senior Site Reliability Engineer | Berlin, Germany | ONSITE | Full-time | €78k - €96k + equity

Kombo (YC S22) is the unified API for 100+ HR/ATS systems. We've grown from 0 to €7M ARR in 2 years and process data for hundreds of millions of people daily. Kombo is known in Berlin for our engineering culture that values quality and product-mindedness.

We're hiring our first Senior SRE to build and scale our infrastructure. You'll own Kubernetes, GCP, Postgres (terabyte-scale), and CI/CD while working closely with our product engineers—with opportunity to build and lead the SRE team as we scale.

Looking for: 6-8+ years SRE/DevOps, strong Postgres administration, Terraform, infrastructure-as-code, distributed systems, and cloud infrastructure.

Stack: Kubernetes, GCP, Postgres, GitHub Actions, Terraform (our philosophy is to keep it lean and efficient)

Apply: https://jobs.ashbyhq.com/Kombo/20d6cb5f-9b51-4a6b-8005-61344... (mention HN)

Odoo | Full Stack Developer | Hybrid (Belgium, 3 days/week) | Full-time | Visa + €10k Signing Bonus | https://www.odoo.com/r/mnk

Odoo builds open-source business apps used by millions. We're hiring full stack developers to work on our Python/PostgreSQL backend, fast JS framework, mobile apps, website builder, and more.

Why join us:

- €10k signing bonus - Visa sponsorship + relocation support (contains 1 month free housing) - No clients, no deadlines — just clean, open-source code - Pick your team after 3 weeks of onboarding - Great team, countryside office (with chef!), flexible hours

You:

- Master several programming languages - Proficiency in object-oriented programming - Strong in SQL, data structures, and DB design - Passionate, autonomous, and eager to build real stuff

Apply → https://www.odoo.com/r/mnk

DigiUsher | https://www.digiusher.com | Senior Backend Engineer | Remote (overlap with West Europe) | Full-time

DigiUsher is a multi-cloud data and AI cost governance platform. We work with AWS, Azure, GCP, and leading system integrators to help enterprises build sustainable, efficient, and profitable cloud solutions.

We're looking for a Senior Backend Engineer to join our core team. You'll play a key role in shaping product architecture, building scalable data integrations, and driving technical strategy as we grow. Ideal candidates are product-minded, detail-oriented, and proficient in Python with experience handling large-scale data.

Tech stack: Python (FastAPI, Celery, Polars, NumPy), PostgreSQL, ClickHouse, Kubernetes, Docker, Terraform, GitHub Actions

You will:

- Architect/build new data integrations and features

- Enhance existing integrations for performance and reliability

- Engage directly with enterprises to understand challenges

- Own responsibilities across the full product lifecycle in a fast-growing startup

Requirements:

- 3+ years of professional Python (or similar) experience

- Background in large-scale data pipelines

- Familiarity with Docker/Kubernetes

- Strong async collaboration & communication skills

Nice to have: Terraform, CloudFormation, or similar devops experience.

Interview process: Screening call → take-home assignment (work relevant) → review → technical/leadership rounds → CEO chat → offer. Typically 2–3 weeks.

More info/apply here: https://wellfound.com/l/2Bywrm or reach out to me at gagan@digiusher.com

I'm the co-founder and CTO and will be personally handling recruitment.

Phrasing.app | Co-founder | EU Remote | Elixir | Clojure

Phrasing is a language learning app built by a polyglot, for polyglots. It was designed to be language agnostic, and currently fully supports over 80 languages. It brings a beautiful, simple, and addictive [1] learning experience to languages big and small, and helps users learn 2-10x more in the same amount of time [2].

The tech stack is a ClojureScript PWA on the front end, and an Elixir umbrella application on the backend. The data processing happens in Broadway pipelines, and are horizontally scalable with FLAME. All of the data is stored in Postgres, and most of the communication between the client and server happens with a custom local-second sync engine à la Linear.app.

The company is bootstrapped and bespoke. There’s no investors, there’s no AI generated code, no shadcdn UIs. I miss the days of the early internet, and acutely feel the mass enshittification of the web. I’m really trying to do something different with the experience as well as the business, all in hopes to bring back a little bit of that wonder that was so prevalent in the days of the early internet.

The app is all working, the experience is great, and the onboarding was just finished. I’ve been using the app now to successfully learn 18 languages [3] and it’s truly a joy to use. Just finishing up the new site [4] after feedback from our last launch and getting ready for more launches [5]. The new video has been getting some pretty rave reviews and is a good gentle introduction to the app [6]

For me, this app is a dream app. This tech stack is a dream tech stack. This company is a dream company. It’s hard to believe I’m the only one these would all be true for.

I’m looking for someone who believes in the product, mission [6], and tech to come in and help me turn this functioning application into something truly great. No experience is required — just a dedication for your craft, and the willingness to take a chance in something you believe in.

If you feel that this post was written for you, please write me a well written personalized CV to hn at phrasing dot app. Low effort applications will not receive a response regardless of your CV.

[1]: https://phrasing.app/blog/humane-srs [2]: https://phrasing.app/blog/10x [3]: https://phrasing.app/blog/language-log-000 [4]: https://phrasing.app/next [5]: https://vimeo.com/1123788743 [6]: https://phrasing.app/blog/mission

Doc Labs | Founding Full-Stack Engineer | San Francisco | REMOTE (US), San Francisco | Full-time | No Visa sponsorship

Enterprises are drowning in unstructured documents and outdated workflows; we see a massive opportunity to build the next big enterprise automation platform to transform how work gets done, starting with commercial construction.

Join now and be at the ground floor of a pre-seed startup with strong momentum already in place: signed design partners, a clear product north star, and product development underway. You’ll be building alongside a team of ex-Salesforce leaders/operators with prior exits and 0→1→Salesforce-scale experience.

What You’ll Do:

- Help architect, build, and ship our core platform.

- Collaborate directly with design partners to validate and iterate quickly.

- Influence product strategy, technical direction and architecture from day one.

Who You Are:

- We’re looking for someone who thrives in ambiguity, moves fast, and thinks boldly.

- You’ve shipped products for 3 years at least and yearn to continue learning everyday growing yourself, the product and the team.

Ideal background includes two or more of the following:

- Data, enterprise SaaS, or startup experience

- Full-stack engineering with equal comfort across both frontend + backend

- AI/ML expertise

Tech Stack:

- SvelteKit, Tailwind, DaisyUI, Postgres, and Supabase

- Fast API, Python, Neo4J, LanceDB, Cloud AI providers

If you’re excited to build, ship, and grow with us, let’s talk. To apply, email me: srini@doclabs.ai

Opsin Security | San Jose / SF Bay Area (Hybrid, 2–3 days on-site) | Full-time | https://opsinsecurity.com/careers Opsin helps enterprises secure and deploy Enterprise Search/AI systems (e.g. Microsoft Copilot, OpenAI Enterprise, Google Gemini) responsibly without exposing sensitive data. Venture-backed by Race Capital. You’ll work directly with the founders on a small (~10) person team shipping fast in a huge green-field space. We are hiring for:

- Senior AI Engineer – 5 + yrs backend + 2 + yrs ML/LLM; Python, SQL, AWS/GCP experience; comp + eq (https://www.opsinsecurity.com/jobs/senior-engineer-ai-engine...)

- Senior Full-Stack Engineer – 4–8 yrs shipping product; React/Next.js + API & DB design + Nest.js; TypeScript, Python a plus; comp + eq (https://www.opsinsecurity.com/jobs/senior-engineer-full-stac...)

- Staff Backend Engineer – 8 + yrs building scalable systems + 2 + yrs technical leadership; architect data-driven services for LLM security; comp + eq (https://www.opsinsecurity.com/jobs/staff-engineer-backend)

- Founding Account Executive – full-cycle sales to CISOs/CIOs; 5 + yrs enterprise SaaS; cybersecurity/Microsoft ecosystem a plus; ~50% travel; comp + eq (https://www.opsinsecurity.com/jobs/founding-account-executiv...)

Tech stack: Python, TypeScript (Nest.js), React (Next.js), Postgres, Azure, modern LLM tooling

How to apply: email your résumé + a short note to careers@opsinsecurity.com with subject “HN – [role]”, or apply on our careers page.

I’m Shay Nehmad, Founding Engineer at the company. Happy to answer questions at shay@opsinsecurity.com or on LinkedIn.

InnoVint | Wine Production Software | Remote (US-based) | FT | Senior BE Developer (Django/Python) We're looking for another great back end developer to join our team. We are a company of 30 large and have been operating for over 10 years. We are not VC backed and operate as an independent company with startup mentality.

- You’ve built and scaled multiple APIs in production. - You’ve deployed eventual consistency in production and know how to make it work for real users. - You have experience mapping event-sourced backends to domain-rich applications - You’ve profiled performance bottlenecks from the HTTP request to the database - You’re fluent in relational databases (we use Postgres) and comfortable with non-relational stores (perhaps Redis). - You’ve written gnarly database queries and have a penchant for building fast, efficient systems - You’re comfortable in Python/Django and modern cloud environments (GCP/AWS/Azure). - You thrive in small, distributed teams where ownership and initiative are key.

https://www.innovint.us/careers/sr-backend-engineer/

ToucanTix | Senior Ruby on Rails Developer | REMOTE (EU/US timezones preferred)

Your code will run the gates at zoos and theme parks across Germany and the USA. When families scan tickets, when capacity limits kick in based on visitors and available resources (staff, equipment, facilities), when dynamic pricing adjusts for weather - that's our Rails app making real-time decisions for thousands of visitors daily.

We're 5 engineers at ToucanTix (sister company Combase has 80+). You'd have serious ownership and architectural influence from day one.

Technical challenges that actually matter:

Multi-tenant architecture supporting 100+ venues with wildly different business logic. Offline-first POS that syncs flawlessly. Complex pricing rules (weather + season + capacity + customer type) that need to stay performant. Hardware integrations with access control and payment systems.

Stack: Rails 7+ API with GraphQL (graphql-ruby), PostgreSQL doing serious heavy lifting with multi-tenant architecture, Redis for speed-critical stuff, SvelteKit frontend (if you're full-stack curious), Google Cloud infrastructure (Cloudtasker, Cloud Storage), RSpec/Capybara keeping everything bulletproof

You: 5+ years Rails. Strong at PostgreSQL optimization. Have architected systems for performance and scale. Comfortable owning technical decisions.

Us: Real ownership. No layers of management. Async-first remote culture. Profitable company, not burning VC cash. Your work has physical impact - people literally can't enter the attraction if your code breaks.

Full details: https://www.toucantix.com/careers/senior-ruby-on-rails-devel...

Apply: jobs@toucantix.com - Send CV + one technical challenge you're proud of solving. Put in subject line.

Sorare | Backend Software Engineer | ONSITE (Paris) | Full-time

Sorare is a fantasy sports gaming experience and marketplace featuring officially licensed digital player cards (minted as NFTs).

Tech Stack: PostgreSQL / Rails / GraphQL / React

We're hiring a replacement for a colleague who's leaving for a world tour.

If you want to read the objective offer you can find it below, but here is the subjective view of what makes me enjoy my job as a sofware engineer there:

- very competent and kind coworkers

- small team that moves fast and decides quickly

- passionate user community

- top work conditions

- bonus: as a sports fan this is heaven

Don't hesitate to reach to me if you have any question:hugo [at] sorare.com.

Read more: https://sorare.com/careers?jid=c81d9cc6-4fcc-472a-a927-e6941...

Y Combinator | Dogpatch, San Francisco, CA | Full-time, In Person | https://www.ycombinator.com

YC has been building ever-more ambitious software for founders to succeed -- since Garry returned. In the last year, our team delivered:

* Safe tools that has processed $1B+ in seed funding in last 4 batches

* Fundraising CRM for founders manage their fundraise -- used by all founders

* Work at a Startup has 1M+ candidates on it, with 1000s of hires/year

There are ton of ways we see YC Software benefitting our alumni and investors -- and we want founder/founding engineer minded people to drive each into standalone products.

Yet in reality, we're a team of 14 full-stack product engineers, the company is 85 people, and we intend to stay small and scrappy. I was the 7th engineer at salesforce and loved the early stage, and we get to be that way at YC... indefinitely.

YC is also knee-deep in applying AI tools and techniques across all of our product surface areas, and investor-focused work is no exception. We’re happy to share more when we chat in person.

We also want to work with people who love building full stack web apps. While our stack is Rails, React and Postgres, mostly we’re just a bunch of pragmatic builders who are excited about shipping and having impact.

Two roles are posted below: Investor Software and Post Batch (all SW after the batch).

If you're interested, read more below and email me directy with what you'd be excited to build here: ryan@ycombinator.com.

* https://www.ycombinator.com/companies/y-combinator/jobs/VT20...

* https://www.ycombinator.com/companies/y-combinator/jobs/fK75...

Comulate | Senior Engineer (3+ YoE) | ONSITE in San Francisco, CA

We're building automation software for the $7T insurance industry, accelerated by AI. Seed stage in terms of headcount (~ 20 people) but Series B in terms of business traction (+ cash-flow positive). We've intentionally stayed under the radar.

- Product has caused customers to literally cry tears of joy

- Experienced eng team from Airbnb / Brex / LiveRamp

- Stack: TS, Postgres, React, GraphQL, and Next.js

Apply here: https://comulate.com/careers

Property Meld | Senior Software Engineer | Full-time | Remote (US & Canada) or Rapid City, SD

Looking for something more meaningful? How about the opportunity to have a direct impact on the property maintenance experience for hundreds of thousands of residents?

Welcome to the future of property maintenance. Property Meld’s vision is to radically improve how the property management industry handles property maintenance. If you’ve ever had a maintenance issue at your housing rental, you know how much of a pain it can be to get it fixed quickly and reliably. It doesn't have to be this way. We're rethinking the entire property maintenance experience from the ground up with two things in mind - first, driving the cost of doing maintenance to the absolute minimum, and second, providing an experience to residents and property owners that makes them want to stay with their property manager. If you are excited about turning something that has historically been a negative experience (maintenance) into a positive experience, we'd love to talk with you.

Stack: Python, Django, Typescript, React, React Native, PostgreSQL

https://property-meld.breezy.hr/p/2c9a513c0d8a-senior-softwa...

Apply through our career page or you can email us at `tech.jobs at propertymeld.com`

Railway | Infra eng - Storage, Infra (Platform) eng, Product Eng (full stack)| REMOTE (Worldwide) | https://jobs.ashbyhq.com/Railway?utm_source=DayMzWzJ0P

Tired of trying to beat kube into shape? Does writing YAML to ship code fill you with utter dread? Dream of a future where deploying software is simple, and you don't need an army of infrastructure engineers to build that perfect janky bash script™ to make life easy?

We're Railway, and we think infrastructure can be better. So far we've built out a platform loved by hundreds of thousands of users who simply tell us "Give me Postgres", "Deploy this repo", and we make it happen

Fair warning! The problems are complex: home-rolled hypervisors, cut-above container orchestration, over/under/whateverlay networks, virtio device drivers, edge proxies, IAM that doesn't suck, kitchen sinks - we need to build it and we're looking for likeminded individuals who think this stuff is fun.

Three open roles (apply below!):

+Infra Engineer - Storage: Apply here: (https://jobs.ashbyhq.com/Railway/25d8444a-47dc-4084-ae56-29a...) Blog post about the team: (https://blog.railway.com/p/data-center-build-part-one)

+Infrastructure Engineer(Platform): -Apply here:(https://jobs.ashbyhq.com/Railway/b8072f95-043f-404d-a313-f0b...) -Blog post about the team: (https://blog.railway.app/p/team-spotlight-infrastructure-eng...)

+Product Engineer (full-stack): -Apply here: (https://jobs.ashbyhq.com/Railway/6ddcfe47-6cce-469b-ba6d-4f0...) -Blog post about the team: (https://blog.railway.app/p/team-spotlight-product-engineerin...)

See you soon, and happy shipping.

Atrix | Head of Engineering | New York, NY | US Based | atrix.ai | Onsite (first 6 months), then flexible after, Fulltime

Atrix builds secure, scalable AI solutions to help pharmaceutical and medical device companies accelerate how life-saving therapies reach patients.

Head of Engineering * Build and scale the engineering team; lead hiring, mentoring, and culture-setting * Contribute directly to the codebase while setting technical standards * (Python, TypeScript/React, SQL/Postgres) * Translate business and product goals into engineering execution with strong delivery rigor * Shape architectural direction, ensure scalability, reliability, and compliance * Establish engineering operations (rituals, QA, incident processes) and align closely with product & business teams * Drive security, system design, and code quality excellence

Requirements: * 7–8+ years of engineering experience, with recent (2–3 years) hands-on leadership in startups (Seed–Series A) * Proven ability to hire, manage, and grow small, high-performing teams (5–10+ engineers) * Actively technical: recent production code contributions and ability to unblock engineers directly * Strong execution mindset from high-velocity startup environments

Why Atrix: * Build the engineering org from 0→1 * Partner directly with the CEO on business-critical impact * Mission-driven work accelerating life-saving medicine * Competitive startup benefits (health stipend, insurance, unlimited PTO, career growth)

Website: https://www.atrix.ai/ Job Description: https://jobs.ashbyhq.com/pear/c5f4c223-cb72-444b-ab89-403e7c...

Apply by sending your resume and info to Carina@atrix.ai