Principal Security Engineer - Blockchain 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: $220K - $300K

Join a stellar team of leaders and experts in blockchain technology, cryptography, and infrastructure to build the backbone of blockchain wallet infrastructure for the next financial era. We are hiring a Principal Security Engineer to lead security design and development across our entire platform. Reporting directly to the CISO, you will set the strategy to protect our high-stakes financial systems, fix vulnerabilities, and keep client wallets safe.

This is a strategic and highly technical role spanning the full security lifecycle. You will make security part of every layer of the stack, from architecture design to incident response. Beyond defense, you will champion secure development practices, mentor engineers, and represent the company's security posture to clients and the wider community.

Responsibilities:

Platform Engineer (Backend)

Location: London, New York

Onsite | Full-time

Compensation: Competitive

Our client is an elite team of builders and a high-growth software development company at the forefront of the fintech and digital asset sectors. The organization is a primary contributor to one of the largest and most active crypto social networks globally, a platform that has generated over $600 million in revenue since early 2024. Operating at the intersection of high-scale social coordination and decentralized finance, the firm is dedicated to redefining the infrastructure of the future.

The organization is seeking a Platform Engineer to join a high-performance environment characterized by talent density and rapid execution. This role is critical in ensuring the security, scalability, and integrity of a platform attracting significant global attention. The successful candidate will bridge the gap between backend engineering and infrastructure security, implementing robust controls across a complex cloud and blockchain ecosystem.

Key Responsibilities

Staff Backend Engineer

Location: London or New York City

Onsite | Full-time

Compensation: competitive

Our client is a high-performance technology development firm responsible for building and operating the infrastructure behind the world’s largest and most active digital asset launchpads. Processing approximately $1B in daily volume, the platform operates at the bleeding edge of crypto scale, requiring systems designed for ultra-low latency, high throughput, and constant high-concurrency load.

The organization is seeking a Lead Backend Engineer to own the most complex technical challenges across the system. This is a high-stakes, high-impact role within an intense, in-person environment. The team is composed of high-agency builders who value speed, immediate impact, and rigorous engineering judgment. This position is ideal for an engineer who thrives under pressure and is motivated by the opportunity to solve ambiguous, cross-cutting problems that others cannot.

Key Responsibilities

Front-End Engineer - Institutional DeFi Liquidity Layer

Location: Remote - US - Would consider South America & Canada (Preference for onsite/hybrid in LA)

Compensation: $ Competitive

We are an on-chain financial infrastructure company building the liquidity layer for the tokenized economy, backed by leading investors. Our flagship protocol connects tokenized assets and high-quality stablecoins to enable 24/7, real-time, compliant capital movement across blockchains. We are seeking a Front-End Engineer to design and build the user experiences that power institutional DeFi, working with production partners including major financial institutions.

You will lead the development of user interfaces for our protocol's web and mobile products and dashboards, spanning swaps, liquidity management, and analytics. This role requires translating complex blockchain and financial interactions into beautiful, intuitive, high-performance interfaces for sophisticated financial users. You'll join a small, high-velocity team, shipping code daily and defining the future of on-chain institutional finance.

Key Responsibilities:

Software Engineer - Founder Accelerator Infrastructure

Location: New York

Onsite | Full-time

Compensation: $180K - $260K

Our client is the premier accelerator for founders within the decentralized technology and digital asset space. Since 2020, the organization has backed over 300 startups—collectively valued at over $10B—positioning itself as a central pillar in the evolution of the global startup ecosystem.

The organization is seeking a high-agency Software Engineer to join an elite, in-house engineering team. This individual will work directly with the Chief Technology Officer and will be responsible for owning product features from initial requirement definition through to production. The ideal candidate is a product-minded builder who excels in high-trust, high-performance environments and possesses the ability to turn ambiguous problems into polished software without the need for dedicated project management or design oversight.

This role is based in New York City. Relocation to NYC is a non-negotiable requirement for this position to ensure close collaboration with founders and the core leadership team.

Key Responsibilities

Location: US or Europe

Remote | Full time

Compensation:  $200K - $300K

Our client is a premier non-custodial trading and data platform at the forefront of cryptocurrency technology. The organization provides a unified base of operations where users retain custody of their funds while accessing live data, instant execution, and powerful charting tools across all emerging markets. By maintaining a lean, high-performance team of exceptional talent, the client ensures rapid release cycles that place new features in the hands of tens of thousands of active users immediately upon completion.

The organization is seeking a Principal Frontend Engineer with extensive experience building highly performant, real-time, and interactive web applications tailored for trading. This individual will serve as a subject matter expert, leveraging a background as a founding or first engineer to guide the platform through its next phase of growth and product expansion.

Key Responsibilities

Company Introduction

We're part of a leading Recruitment-as-a-Service (RaaS) network powered by Hustler Marketing. Hustler Marketing is a full-service digital agency serving eCommerce stores and B2B brands globally, specializing in email & SMS marketing, UGC ads, creative production, and high-quality talent placement.

What sets us apart is our values: bold creativity, data-driven decision making, and a linchpin mindset. Nearly 75 clients across 5 continents trust us not only for campaigns, but also for building strong, scalable teams that drive long-term growth. Hustler Marketing recruits top talent across the Americas, Europe, and Asia, offering flexibility, global reach, and meaningful opportunities to shape client success.

About the Role

The Head of Conversion Rate Optimization is a senior leadership position responsible for driving and overseeing CRO strategies across our portfolio of high-growth clients. This role combines strategic thinking with hands-on expertise, requiring you to lead CRO initiatives, mentor team members, and interface directly with C-level clients to deliver transformational business results.

Location: New York City

Employment Type: Full-time

Work Arrangement: On-site in NYC office (regular travel, 30-50%, for client engagements)

About the Role

Our client, an AI startup founded by engineers from institutions like Palantir and Citadel, is building the first AI-augmented deep research platform for the financial services industry. They recently raised $7.25 million from backers including founders of OpenAI and DBT.

As a Forward Deployed Software Engineer, you will be the technical architect for their most strategic client relationships at top financial firms. This role embodies the principle of "Forward-Deployed with Product DNA," meaning you embed directly with clients to own their outcomes while simultaneously architecting platform features that serve the entire market. Success is measured by your ability to iterate, deploy, and co-develop competitive advantages in high-stakes research environments.

Key Responsibilities

Union Maritime Limited has experienced exceptional growth over the last five years, and as part of this expansion, we recognise the need to strengthen our global commercial presence.

We are excited to introduce a new and highly impactful role: Commercial Analytics Associate. Based in our London office, this position offers an outstanding opportunity for a motivated and ambitious individual to make a significant contribution to our dynamic and rapidly expanding Commercial team. 

Role Summary

Based in our London office, this position offers an outstanding opportunity for a motivated and ambitious individual to make a significant contribution to our dynamic and rapidly expanding team.

This role offers hands-on experience in the fast-paced world of international shipping and maritime investments, enabling you to make direct contributions to Union Maritime's continued growth and success.

A primary focus will be on the EU Emissions Trading System (EU ETS), FuelEU Maritime, and the IMO Greenhouse Gas Fuel Intensity (IMO GFI), requiring the ability to translate complex legislative text into precise, actionable analytical tools.​ 

Key Responsibilities

​​Union Maritime Limited has experienced exceptional growth over the last five years, and as part of this expansion, we recognise the need to strengthen our global commercial presence.

We are excited to introduce a new and highly impactful role: Commercial Analytics Associate. Based in our London office, this position offers an outstanding opportunity for a motivated and ambitious individual to make a significant contribution to our dynamic and rapidly expanding Commercial team. 

Role Summary
As a Commercial Analytics Associate, you will work closely with the Head of Commercial Analytics and collaborate with the broader Commercial team to drive key strategic initiatives.

You will have the chance to develop and implement analytical models that influence major business decisions and projects. This role offers a hands-on experience in the fast-paced world of international shipping and maritime investments, allowing you to contribute directly to Union Maritime's continued growth and success.

Key Responsibilities

As a Commercial Analytics Associate, you will play a critical role in supporting and enhancing the Commercial team's strategic efforts by: