Konvu | https://konvu.com/ | Software Engineer | FULLTIME | ONSITE | Paris, France

At Konvu, we’re on a mission to make security invisible. As we move towards a future dominated by code automatically generated, tested, and deployed by AIs, we need a new paradigm for application security. We need vulnerabilities to be automatically detected, prioritized and remediated.

Behind Konvu are founders with deep roots in the security industry. As part of the founding team at Sqreen (YC W18), a notable security startup acquired by Datadog, we have firsthand experience in driving security solutions from concept to global impact.

We’re looking for:

* AI Engineer (Intermediate-Expert) https://jobs.ashbyhq.com/konvu/2ef1efa3-270d-4c4a-8af6-bde52...

* Software Engineer (Expert) https://jobs.ashbyhq.com/konvu/fd57b278-39c6-4ed1-a1b8-a8732...

ChainSecurity | Blockchain Security Engineer | Full-time | INTERNS , HYBRID/REMOTE, Zurich, Switzerland | VISA possible | https://chainsecurity.com/

ChainSecurity is a young and innovative cybersecurity company that operates in the blockchain and cryptocurrency space. Our mission is to make the blockchain space secure and trustworthy for people, companies, and governments alike. We are proud of our security experts from the renowned universities ETH Zurich, EPFL Lausanne and others. We are trusted by 100+ blockchain companies and established corporations with security audits and services. We have secured complex systems for top blockchain clients, such as decentralized finance (DeFi) projects, and multinational organizations, such as banks and industrial consortia.

A ChainSecurity Auditor will review the most complex blockchain projects to find vulnerabilities which no-one else can. By using state of the art tools, expert knowledge and a deep understanding of the fundamentals, we secure projects handling billions, often forming the foundation in the new paradigm of an open financial system.

Your Responsibilities:

* Work directly with the developers of the most successful teams in the blockchain industry to audit their code and secure their products

* Contribute to our security tools and create new ones in collaboration with our internal research team

* Conduct security research and publish your findings

Requirements:

* Strong background in software engineering, focused on security relevant areas and most importantly being able to reason about complex code

* Experience with penetration testing, vulnerability scanning, threat modeling or similar is a plus

* Good knowledge of cryptography

* Proficiency with Linux and Git

* Good written communication skills

* Fluent in OOP programming language

Bonus Points:

* Formal Verification, White Box, Vulnerability Scanning

* Solid Blockchain Knowledge

* Consensus Algorithms

Join us here: https://www.chainsecurity.com/jobs/blockchain-security-engin...

Questions about the role? Contact: Email is hidden

Civic Roundtable | Growth Marketer | Full-time | Remote (US) Civic Roundtable is building the government operations platform. We're software startup backed by General Catalyst and trusted by public servants at over 1,500 agencies in all 50 states. Growth Marketer job description: https://jobs.ashbyhq.com/civic%20Roundtable/f74105bd-57bc-4e...

PowerSync | Senior Backend Engineer and Database Expert | Full-time | Remote (opt-in regional offices)

PowerSync is a sync engine that keeps your backend database in sync with on-device SQLite. We support Postgres, MySQL, MongoDB and SQL Server as source databases and have a plethora of client SDKS, many of which are integrated with popular libraries and frameworks on the client-side like TanStack DB, Drizzle, GRDB, Room, etc

If you're a database enthusiast and have a solid track record of building, deploying and maintaining backend systems on modern cloud stacks at scale, please check us out.

Detail: https://www.powersync.com/careers/senior-backend-engineer-an...

Our team is small and polyglot, but experience with TypeScript is a must.

Experience with OSS projects is also a must - either you've made significant contributions to popular devtool projects or, better yet, you have your own.

Culture: We're agile and devops purists (before those terms got coopted)

DuckDuckGo | Multiple Roles | Remote | Full-time | $178,500 - $320,000 USD + equity

Senior Backend Engineer - $178,500 USD + equity https://jobs.ashbyhq.com/duck-duck-go/abb953ee-5bb7-4637-9f6...

Senior Privacy Engineer - $178,500 USD + equity https://jobs.ashbyhq.com/duck-duck-go/72ec81ce-54a2-447a-9a8...

Senior Android Engineer - $178,500 USD + equity https://jobs.ashbyhq.com/duck-duck-go/0499efdf-2de5-4e4e-8c3...

Senior iOS Engineer - $178,500 USD + equity https://jobs.ashbyhq.com/duck-duck-go/a1239b43-0c9a-45a4-b35...

Senior Web Security Engineer, Browser Platform - $178,500 USD + equity https://jobs.ashbyhq.com/duck-duck-go/12b7b49c-ee06-4d70-850...

Senior Software Engineer, Windows Desktop App (New Positions) - $178,500 USD + equity — https://jobs.ashbyhq.com/duck-duck-go/47e569c6-f995-4955-a89...

Engineering Director, Browser Platform - $243,800 USD + equity https://jobs.ashbyhq.com/duck-duck-go/0541f1f3-4302-4b76-93a...

VP, Business Development - $320,000 USD + equity https://jobs.ashbyhq.com/duck-duck-go/276ae352-55b5-4fb2-9b9...

Director, Product Management - - $243,800 USD + equity https://jobs.ashbyhq.com/duck-duck-go/2a379a3e-ee10-45d2-927...

Shorebird | Mid-Senior C++/Runtime OR Dart/Cloud Engineers | REMOTE (North America) | Full-time | $150-230k + equity + benefits | https://shorebird.dev

Flutter/Shorebird founder here. Flutter is used by millions of devs (and nearly ⅓ of free apps submitted to AppStore), but is missing services for businesses. We offer Flutter-related SAAS used by 1000s businesses globally, on track to profitability early 2026.

As part of our over-the-air updates “code push” product, we’ve built a custom compiler and runtime for the Dart language, primarily written by me (founder/CEO). We need a fulltime engineer to take over primary responsibility for all of our C++ code (Dart & Flutter forks, custom runtime, compiler, etc.) and evolve it further than I could alone. You don’t need to be a compiler/runtime expert. You do need to be capable of working on large open source projects, be comfortable with C++, want to work at a startup, work well independently (we’re remote) and want to learn and work on lots of different areas of code. If you’ve contributed at least a little to WebKit, Godot, Firefox, or any other open source project and are at least compiler/runtime curious, you will likely find this role extremely rewarding.

For our second role: we serve 10s of millions of devices daily from our cloud, (2k+ RPS sustained), built mostly in Dart on Google Cloud + CloudFlare. We’re in the process of launching a CI product and have a lot of cloud development work ahead of us. You need some cloud experience, want to work at a startup, and be willing to work in Dart (what our customers use).

We’re a small, senior team, making something people want. Tech: GCP, Cloudflare, React, Dart, C++, Rust. Shorebird operates almost entirely in the public over Discord. https://discord.gg/shorebird

https://shorebird.dev/jobs

Furtim Modus | Hiring Java Developer (Full-Time) | NYC (HYBRID) | https://www.furtimmodus.com/software-engineer

We are currently seeking a talented and driven Java Developer to join our team full-time. This is an exciting opportunity to contribute your skills and expertise to a fintech venture with emphasis in capital markets tech based out of the New York City and in exchange we’ll provide you with base comp $125k-200k, full benefits, cash bonus, and equity.

Requirements:

- Electronic trading server-side software development experience

- Experience in Open Source technologies such as Aeron Transport, Aeron Cluster, Aeron Archive, Artio, Agrona, or CoinTossX is a big plus

- Experience with Adaptive Hydra trading platform is a big plus

Benefits:

- Flexible hybrid schedule to accommodate other commitments

- Collaborative and supportive team environment

- Relocation assistance to NYC Metro area

If you are passionate about Java development and interested in joining a fintech venture, we would love to hear from you. Please submit your resume if interested to Email is hidden in this opportunity.

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Furtim Modus | Hiring DevOps Engineer (Full-Time) | NYC (HYBRID) | https://www.furtimmodus.com/devops-engineer

We are currently seeking a talented and driven DevOps Engineer to join our team full-time. This is an exciting opportunity to contribute your skills and expertise to a fintech venture with emphasis in capital markets tech based out of the New York City and in exchange we’ll provide you with base comp $125k-$175k, full benefits, cash bonus, and equity.

Requirements:

- Electronic trading DevOps engineering experience

Plus:

- Experience in Open Source technologies such as Aeron Transport, Aeron Cluster, Aeron Archive, Artio, Agrona, or CoinTossX is a big plus

- Experience with Adaptive Hydra trading platform is a big plus

Benefits:

- Flexible hybrid schedule to accommodate other commitments

- Collaborative and supportive team environment

- Relocation assistance to NYC Metro area

If you are passionate about DevOps engineering and interested in joining a fintech venture, we would love to hear from you. Please submit your resume if interested to Email is hidden in this opportunity.

BetterBugs | Remote | Full-time | https://betterbugs.io

We’re building debugging intelligence for modern software teams. BetterBugs captures rich technical context at the moment a bug occurs and turns it into actionable insights for developers — not screenshots, not back-and-forth.

Our next leap: AI that understands bugs, not just describes them.

Senior AI / LLM Engineer (Python) : Build production LLM systems that understand real-world bug context (logs, stack traces, network, user actions). Design agent workflows for root-cause analysis, bug triaging, and debugging assistance. Implement RAG pipelines grounded in codebases, historical bugs, and execution data. Own prompting, evaluation, reliability, and observability of AI outputs. Build and operate Python services (FastAPI) powering AI features in production. Strong Python, hands-on LLM/agent frameworks, Docker; bonus for dev tooling or observability experience.

Notable Health | Staff Fullstack Engineer/Senior Software Engineer/Forward Deployed Engineer | San Mateo, CA | Hybrid

Join us at Notable Health! We're building intelligent automation to transform how healthcare works—freeing up clinicians and staff to focus on what matters most: patient care. Our platform uses AI to eliminate manual workflows, streamline operations, and improve outcomes across leading health systems. If you're passionate about meaningful impact and cutting-edge technology, we’d love to hear from you.

Apply here: https://jobs.ashbyhq.com/notable More at: https://www.notablehealth.com

Replica | Software Engineer | New York City Onsite (Hybrid) | NYC Area Required | Full-time | https://www.replicahq.com

Replica builds software and data to understand the built environment and ways people interact with it. With better data, human-context and an intuitive design, Replica helps public and private sector customers make informed, effective, and responsive decisions. By showing how people live, move and work, we contextualize hard choices, allowing our clients to see around corners and understand the trade-offs surrounding their decisions. Whether for a city planner increasing public transit to underserved neighborhoods or for a grocery chain evaluating where to open a new location, Replica’s insights let clients make more informed, people-centered decisions.

Software Engineer (Applications) - https://replicainc.applytojob.com/apply/j2uyoshstc/software-...

Software Engineer (Platform) - https://replicainc.applytojob.com/apply/7njkirsla2/software-...

Product Strategist - https://replicainc.applytojob.com/apply/kwv1miho5a/product-s...