Senior Frontend Engineer
About Notabene
Notabene is focused on integrating crypto into everyday economic activities. The team, spanning across three continents and eight countries, supports a diverse customer base of over 100 organizations ranging from financial institutions to fintechs and exchanges. Notabene's founders have been pioneers in developing Self Sovereign Identity protocols. This technology plays a crucial role in the company's advanced tech stack.
The company has garnered investments from reputable firms such as Y Combinator, Jump Capital, and Castle Island, indicating its strong growth trajectory.
About The Role
The Senior Frontend Engineer position at Notabene empowers you to revolutionize how people conduct daily transactions using stablecoins. You will play a vital role in advancing and maintaining essential embedded Payments UI components that facilitate compliance procedures in customer payment processes. Your responsibilities will include gathering additional user information to ensure secure transactions, interacting with a wide range of web3 and hardware wallets.
In this role, you will utilize Svelte and various mobile development frameworks like React Native to create a seamless user experience across web and mobile platforms. Collaborating closely with product, security, and platform teams, you will introduce new features to the market.
Key Responsibilities
- Utilize strong Web3 expertise to understand both current and evolving payment use cases.
- Ensure secure and compliant data handling within the Payments UI to safeguard sensitive data and engage with crypto wallets.
- Work collaboratively with product, design, security, and platform teams to align Payments UX functionality with the Notabene platform.
- Advocate for frontend development best practices and security protocols to maintain high technical standards in embedded applications.
What you bring to Notabene
Over 7 years of frontend development experience with a focus on developing embedded UI components for payments, web3, or secure applications.
Expertise in Web3 technology including cryptography, public/private key encryption, and familiarity with decentralized identity solutions.
Proficiency in Svelte and React/React Native and experience in optimizing components for web and mobile platforms.
Sound knowledge of web security, PII handling practices, RESTful APIs, web sockets, and event-driven data flows.
Strong problem-solving skills, attention to detail, and the ability to work autonomously in a global, remote-first environment.
Excellent communication skills to collaborate effectively across various teams and departments.
If you believe you are a suitable candidate for this role, we encourage you to apply regardless of your blockchain experience. Notabene promotes diversity and inclusion and does not discriminate based on various factors including race, gender, age, sexual orientation, or veteran status.
Junior/Mid Decentralized Infrastructure Engineer
Help build and scale decentralized infrastructure: contribute to compute networks, protocols, storage layers, and orchestration tools that power AI agents and open digital systems. You’ll write code, run tests, fix bugs, and ship real features fast.
Skills & Requirements:
1–3 years in blockchain infra, distributed systems, or high-scale compute (or strong personal projects)
Solid Python / Rust / Go skills
Interest in libp2p, IPFS, GPU orchestration, or decentralized compute
Quick learner who ships clean code and loves performance/cost challenges
Salary:
$110,000 – $165,000 USD base + meaningful equity (portfolio startup) + full benefits + Sirex carry
Description:
Sirex.vc doesn’t just invest — we plug strong builders straight into our portfolio companies.
This is your chance to work on the real infrastructure behind autonomous agents and the open digital economy. Full support from the Sirex team, fast growth, zero bureaucracy.
High risk. Zero apologies.
Senior Decentralized Infrastructure Engineer
Build and scale production-grade decentralized infrastructure: compute networks, protocols, storage layers, orchestration for AI workloads, and open-source primitives that power the next generation of agent systems.Skills &
Requirements:
4+ years in blockchain infra, distributed systems or high-scale compute
Deep experience with Rust / Go / C++ and protocols (libp2p, IPFS, custom consensus, GPU orchestration)
Bonus: self-hosted AI compute, decentralized training or edge inference
Ship fast, own uptime, love extreme performance and cost efficiency
Salary:
$175,000 – $255,000 USD base + big equity (portfolio startup) + full benefits + Sirex carry
Description:
Sirex.vc doesn’t just invest — we plug elite builders straight into our fastest portfolio companies.
This is your chance to build the actual rails for autonomous agents and open digital economy at scale. Zero bureaucracy, maximum leverage.
High risk. Zero apologies.
Web3 Fullstack Developer
Neonflick is a tech organization specializing in Web3 development.
We believe Web3 solutions are not as popular as they could be — mainly due to complexity. Our mission is to simplify the user experience and make decentralized technology more accessible and easy to use for everyone.
🚀 About the Role
We are looking for a Web3 Fullstack Developer who is passionate about decentralized technologies and excited to contribute to building meaningful Web3 products. You will work on developing new products, improving existing ones, and fixing bugs, all while proposing innovative ideas to enhance our platform.
🔹 Responsibilities
Develop functional and user-friendly Web3 products
Improve and optimize existing products and features
Identify and fix bugs or issues in the system
Propose and implement new ideas for product development
Collaborate with the team to ensure high-quality software delivery
🔹 Requirements
Strong interest in Web3 / blockchain / decentralized technologies
Fullstack development experience (frontend + backend)
Experience with smart contracts and decentralized frameworks is a plus
Problem-solving skills and attention to detail
Ability to work independently and proactively
🔹 What You Get
Early-stage involvement in a Web3 tech organization
Influence over product development and feature design
Opportunity to build experience and a portfolio in the Web3 space
Potential long-term collaboration and future compensation as the project grows
A chance to contribute to making Web3 simpler and more accessible
⚠️ Important
This is an unpaid position. We are looking for someone motivated by vision, learning, and long-term impact rather than immediate salary.
If you are passionate about Web3 and building meaningful decentralized products, we’d love to hear from you.
Junior AI Engineer
Join one of our fast-growing portfolio startups and help build simple AI features. You’ll work with large language models, create basic automations and chat tools, test ideas, fix small bugs, and integrate AI into everyday products.
Skills & Requirements:
0–2 years of experience (fresh graduates or self-taught welcome)
Basic Python knowledge
Interest in AI, LLMs or chatbots (personal projects are a big plus)
Quick learner who enjoys trying new things
Good English for team communication
Salary: $95,000 – $135,000 USD base + equity in the startup + full benefits
Description:
Sirex.vc not only invests — we actively help our portfolio companies hire great people. This Junior AI Engineer role is inside one of our AI-native startups. You’ll get real hands-on experience, learn from the best, and build things users actually use — all with full support from the Sirex team.
High risk. Zero apologies.
AI Agent Engineer
Join one of our high-conviction AI-native portfolio companies and build autonomous AI agents from the ground up. You’ll design agent architectures, implement tool-calling & memory systems, connect them to browsers/shell/APIs, run long-horizon tasks, and ship features that make the product feel alive and truly useful.
Skills & Requirements:
2–5 years building LLM-powered agents (LangGraph, CrewAI, ReAct, custom frameworks)
Strong Python skills + experience with tool calling, RAG, vector stores and evaluation
Bonus: familiarity with browser automation, self-hosted models or decentralized compute
Fast executor who loves shipping in ambiguity
Passion for agents that actually do real work (not just chat)
Salary: $160,000 – $230,000 USD base + meaningful equity (in the portfolio company) + full benefits + carry from Sirex network
Description:
Sirex.vc doesn’t only write checks — we actively help our portfolio companies recruit the best people on the planet. This AI Agent Engineer role is inside one of our fastest-moving startups building the next generation of autonomous agents. You’ll get direct support, intros, and operational help from the Sirex team while working on frontier technology that can change how the world uses AI.
High risk. Zero apologies.