Senior Core Systems Engineer - Secure Wallet Infrastructure

Location: Remote - Location: US or EU (remote-first, office optional). Must be in the US, not Canada or in the European Union. France or Paris or as close as possible, always preferred.

Compensation: $180K - $260K

Join a stellar team of leaders and experts in blockchain technology, cryptography, infrastructure, and security to build the backbone of blockchain wallet infrastructure for the next financial era. We are hiring a Senior Core Systems Engineer to design, build, and scale the low-level systems at the heart of our platform, where performance, security, and correctness are non-negotiable. This is a high-impact role focused on turning advanced cryptography into fast, resilient, and trusted production infrastructure.

As a Core Systems Engineer, you will work deep in the stack, designing and scaling reliable distributed services and integrating them with cloud, hardware, and blockchain environments. You will collaborate across product, research, and security to implement advanced cryptographic and security protocols using low-level systems languages.

Responsibilities:

Fullstack Engineer - Global Crypto Jackpot

Location: Remote - Preference for SF based candidates or (Candidates that are based in North America that are able to travel to San Fran every quarter for a short time of office collaboration)

Compensation: $125K - $225K

In a few years, the whole world will pause for a moment every day to see who just became a billionaire. At our company, we’re building the first global jackpot. We're already crypto's largest jackpot with over $100M in drawings and a novel bootstrapping mechanism that builds massive prize pools. Having recently raised $5M from Tier 1 crypto investors and founders of the world’s largest iGaming brands, we are rebuilding our platform for a major launch soon.

As a Founding Fullstack Engineer, you will be deeply involved in all aspects of building this company, working across our first-party app, backend infrastructure, and developer experience. This is a high-ownership role where you will help set the strategy for the company's technical foundation and culture.

Your Role Involves:

Staff Backend Engineer - Crypto Trading Platform

location: Remote - US or Europe (US Preferred)

compensation: Competitive Base Salary + Bonus

We are hiring on behalf of our client, a market-leading company at the forefront of crypto trading technology. Their platform is known as the largest in its category, having facilitated over $22 billion in volume for more than 50,000 daily active users. They deliver seamless on-chain trading experiences with advanced tools like DCA & limit orders, sniping, and automatic wallet copy-trading, setting the standard for speed, innovation, and reliability. Your work will be live in the hands of tens of thousands of users immediately upon completion.

They are seeking a Staff Backend Engineer with proven expertise in designing, building, and owning scalable, high-throughput, and low-latency microservices-based backends in TypeScript. This highly autonomous technical leadership role involves reporting directly to the technical co-founders. You will be expected to thrive on complex challenges and drive the development of new innovative features.

Key Responsibilities:

DeFi Application Full-Stack Engineer

Location: Remote - USA, Canada and would consider candidates based in Puerto Rico

Compensation: $150K - $200K

We lead the field in quantitative research and optimization of decentralized finance (DeFi) economics. We manage market risk, optimize growth, and ensure economic safety for protocols facilitating most spot trading, borrowing, and lending activity across all of DeFi, protecting and optimizing the largest protocols and networks in the industry, which secure and manage over $42 billion in customer assets. Join us as we drive the adoption and understanding of the financial systems of the future.

Join a newly formed product pod focused on our next-generation decentralized application (dApp), which allows users to deposit and withdraw into vaults directly. This is a critical, high-impact initiative to evolve our current dashboard into a direct revenue-generating product. You will provide technical leadership in a remote-first environment, building a robust, user-facing experience at the heart of our business.

Responsibilities:

Senior/Lead Backend Engineer - FinTech/Crypto

location: Remote - Fully remote across Europe - they can do B2B or hire through EoR.

compensation: $115K - $130K

We are seeking a Senior/Lead Backend Engineer to join our team dedicated to revolutionizing the FinTech and crypto industries. You will be a pillar of our engineering team, working directly with the product team to solve complex banking and crypto problems. This role requires an obsession with robust architecture, efficiency, and resilience, and a commitment to delivering the most elegant solutions and the best product for our customers.

This is a fast-paced, high-impact role where your speed, ability to deliver, and capacity for elegant problem-solving will be critical. You will be responsible for building the core services that drive our new paradigm in finance.

What you’ll be working on:

Senior Full Stack Engineer (Founding Role)

Location: Hybrid in New York City, NY

Compensation: $150,000 - $250,000 (Base Salary) + Significant Equity

We are a fast-growing, mission-driven mental health startup tackling a critical and underserved area: geriatric mental health care (the 65+ age group). Backed by top-tier VCs and healthcare founders, we've achieved extreme Product-Market Fit in a large, blue ocean market. We are seeking a Founding Full-Stack Engineer to lead our AI-powered full stack from architecture to launch, with a clear trajectory to an Engineering Leadership role.

This is a ground-floor opportunity that demands speed, autonomy, and technical excellence. You will work side-by-side with the co-founders, owning major technical decisions and shaping the engineering organization.

Your Key Responsibilities:

Senior Backend Engineer

Location: Hybrid in New York, NY

Compensation: $130,000 - $200,000 (Base Salary) + Competitive Equity

We are a rapidly growing, well-funded B2B SaaS company that is reinventing the Accounts Receivable category for scaling technology companies. Founded by repeat entrepreneurs and backed by major VCs, we are in hypergrowth mode, providing a modern, AI-powered platform to automate complex revenue workflows and billing. We are seeking a Mid/Senior Product Engineer with strong backend skills to build world-class financial tools and help shape our engineering culture.

This is a high-impact, product-focused role where you will take on significant responsibility for building the foundation of our platform, directly influencing product direction and company success.

In this role, you will:

Location: San Francisco, CA (Hybrid - 4 days/week in-person)

Compensation: $125,000 - $200,000 (Base Salary) + Equity Participation

We are a rapidly growing, well-capitalized health tech company pioneering the use of Generative AI and Voice Agents to transform patient communication. Our platform has already handled hundreds of thousands of patient interactions across over a hundred clinics, and we are scaling fast. We are looking for a product-minded Senior Software Engineer to build and scale the intelligent systems that make exceptional healthcare accessible anytime, anywhere.

As a Senior Software Engineer, you will play a critical role in developing our AI-powered communication platform, working alongside world-class engineers and founders. You will have a high degree of autonomy and be involved in key product decisions from the ground up.

Key Responsibilities:

Senior Infrastructure Software Engineer

Location: Hybrid in Miami, Florida

Compensation: $200,000 - $250,000 (Base Salary) + Competitive Equity

We are the world's leading AI medical information platform, backed by top-tier investors and trusted by healthcare professionals at over 10,000 care centers worldwide. Our mission-critical platform powers medical AI used by healthcare providers globally. We are seeking a Senior Infrastructure Software Engineer to architect and scale our infrastructure ecosystem in a demanding, rapid-iteration environment.

As a key member of the Core Engineering team, you will have significant autonomy to make architectural decisions and drive initiatives across service reliability, data pipelines, and security for our large-scale medical AI platform.

Responsibilities:

Product Engineer

Location: Hybrid in New York (Flatiron) or Boston, MA

Compensation: $160,000 - $225,000 (Base Salary) + Competitive Equity

We are a well-funded, AI-first medical practice backed by over $35M from top-tier VC firms. Our mission is to define the future of human + AI collaborative care models by building a platform that automates across the entire clinical stack. We are seeking a talented, driven Product Engineer to take significant ownership over our product and help scale our engineering organization as we serve hundreds of thousands of patients nationwide.

This is a high-impact, hybrid role where you will be at the intersection of full-stack development, data infrastructure, and AI tooling. You will work cross-functionally with product, clinical, and commercial teams to integrate our platform with prominent healthcare organizations.

What you’ll be working on: