Quantitative Trading & Market Microstructure Specialist - High-Performance DEX

Location: Remote - Global (Preference for candidates based in: Lisbon, Portugal / UAE / Switzerland / Singapore / Hong Kong / Brazil / USA / UK / Spain / Canada / France / Germany / Greece)

Compensation: $180K - $220K

We are building a high-performance blockchain operating system that fundamentally redefines what's possible on Ethereum by prioritizing unparalleled throughput, decentralization, and security. We are now expanding the team for O2, a new, early-stage project: a next-generation decentralized exchange (DEX) running on our modular execution layer. Designed as a Central Limit Order Book (CLOB), our goal is to build the fastest DEX ever constructed, leveraging parallel execution to unlock high-frequency trading efficiency fully on-chain.

You will play a foundational role, leveraging your expertise in market making and quantitative trading to model, simulate, and optimize the market behavior of our core CLOB protocol. This is a highly hands-on role where you will design and test trading strategy logic, build simulation frameworks, and collaborate with engineering and research to inform critical protocol-level design decisions.

Key Responsibilities:

HSO are a leading Microsoft Dynamics Gold partner who were founded in 1987 specialising in sectors such as Retail, Rental, Manufacturing, Professional Services and Local Government. With a head count of over 280 employees in the UK, winning multiple awards such as 2020 Microsoft Partner of the Year, Best Tech company 2021 and Top 3 Large Companies to work for 2021, our reputation in the Dynamics Market is higher than ever. Prioritizing customer satisfaction, our expertise and pragmatic approach to each customer’s business needs enable us to provide a 100% reference-able solution, supported by award-winning 24-hour support. Our recruitment moto has always been – ‘We don’t want good people to just join us, we want them to stay with us’. Ensuring our employees are challenged, supported, and engaged in our wider family is key to our continued success – we have a designated Learning and Development Team who are continuously offering the best training on the market, combined with an Engagement Team who are creative in ways we can have social activities virtually. From online chess tournaments to coffee mornings, to Netflix and book clubs, virtual singing classes, online yoga – the list is endless!

Requirements

Microsoft Power Platform Technical Consultant

(Power Apps – Power Automate – Power Pages)

Staff Software Engineer - Distributed Ledger Execution

Location: Remote - US

Compensation: $ Competitive

We are a fast-growing software company committed to supporting, developing, and servicing an open source, proof-of-stake platform. This EVM-compatible Distributed Ledger Technology (DLT) is specifically built to meet the needs of enterprise and Web3 applications, prioritizing speed, security, stability, and sustainability. We are seeking a Staff Software Engineer to be a technical leader on our core Execution Team.

You will be responsible for delivering software services, business logic, and APIs within the core Consensus Node—the heart of our DLT. This is a high-impact role requiring deep passion for solving technical challenges involving distributed execution, state management, transaction lifecycles, and economic systems (fees, rewards). You will drive technical direction, optimize performance, and mentor engineers within a highly collaborative, open-source environment.

Key Responsibilities:

Senior Software Engineer - Developer Tools & SDKs

Location: Remote - US & Americas

Compensation: $ Competitive

We are a fast-growing software company dedicated to supporting and developing an EVM-compatible, open-source, proof-of-stake platform. This public network is engineered for enterprise and Web3 applications, prioritizing speed, security, stability, and sustainability, and is governed by industry-leading organizations. We are seeking an experienced Software Engineer to lead the development of world-class developer tools and SDKs.

You will take the lead on crafting seamless developer experiences, owning the design, build, and maintenance of our open-source SDKs and related tooling. This role requires technical leadership, hands-on coding across multiple languages, and a strong focus on developer empathy. You will work cross-functionally to ensure our tools are intuitive, robust, and aligned with real-world developer needs.

What You'll Be Doing:

Full Stack Engineer - Payments & FinTech Web Applications

Location: Remote - Based in EST or GMT+1

Compensation: $120K - $150K

We are a high-growth technology company building a robust FinTech and payments platform. We are seeking an experienced Full Stack Engineer with strong product sense and deep technical expertise to design and build the secure, scalable, and high-performing web applications that power our platform. This role requires translating complex backend financial systems into intuitive, reliable user experiences.

You will own the development lifecycle of web applications from design through release, working across the full stack with an emphasis on the frontend user experience. You will collaborate closely with backend teams, ensuring that all features prioritize performance, security, and scalability. You will be expected to treat UI components and APIs as products, maintaining high standards for code quality and architectural clarity.

What You'll Do:

Senior/Lead EVM Engineer - Distributed Ledger Optimization

Location: Remote - US

Compensation: Competitive

We are a fast-growing software company committed to supporting, developing, and servicing an open source, proof-of-stake, EVM-compatible platform. This decentralized network is built for enterprise and Web3 applications, prioritizing speed, security, and stability. We are seeking a seasoned EVM Engineer to join our Smart Contracts team and drive the performance and optimization of our core native services (Java) and Web3 services (JS/TS).

You will be a high-impact contributor, spending approximately 80% of your time designing, coding, and testing core components. Your focus will be on the execution layer, specifically transforming network node states, processing transaction bytes, and exposing critical network data. This includes innovating on compiler and optimization algorithms, enhancing EVM features, and contributing to open-source code clients.

Key Responsibilities:

Founding Engineer - High-Growth DeFi Mobile Trading App

Location: Remote - US Remote (Must be able to travel to NYC 2 weeks at a time, every 1-2 months for in person collaboration)

Compensation: $200K - $300K

We are a rapidly growing mobile app—the “Robinhood for DeFi”—that allows anyone to trade cryptocurrencies on-chain through a user-friendly interface. Since our launch, we have attracted 1.5+ million users. We are a lean, mission-driven team dedicated to making decentralized finance open and accessible to the world. We are looking for a Founding Engineer to assume a hands-on role in designing, building, and maintaining the production features that power our platform.

You will have end-to-end feature ownership across both our mobile and backend systems, shaping the core user experience for millions of users. This role demands rapid iteration, a security-first mindset, and the ability to design robust, scalable features. You will be a decision-maker and implementer, directly influencing the technical direction of the company.

What You'll Be Doing:

React Native Engineer - High-Growth Crypto Social Network

Location: London, New York City (Office)

Compensation: $250K - $300K

We are a team of elite builders and a high-growth software development company known for redefining what's possible in Web3. We are proud contributors to one of the largest crypto social networks globally, where we are actively building for the future. We are looking for a highly skilled React Native Engineer to play a crucial role in shaping the future of this exciting, fast-moving venture.

You will be responsible for the end-to-end development and deployment of mobile applications that support a rapidly scaling crypto social platform. This role requires a strong focus on execution, speed, and quality, working in an environment that values pushing technical boundaries and delivering innovative products to a global user base.

Key Responsibilities:

Mercier Consultancy MD is excited to present an opportunity for Polish Speaking Customer Service Representatives in the retail industry, based in Sofia, Bulgaria. This role is ideal for individuals passionate about customer service and retail. As a representative, you'll assist customers with inquiries related to products, services, and promotions, all while enhancing their shopping experience in Polish.

Key Responsibilities

• Respond to customer inquiries regarding retail products, stock availability, and service options via phone, email, and live chat in Polish.
• Provide detailed information about promotions, pricing, and return policies.
• Assist customers with order placement, tracking, changes, and cancellations.
• Resolve any customer complaints or issues in a timely and effective manner.
• Maintain accurate documentation of customer interactions in our CRM system.
• Collaborate with internal teams to ensure smooth service delivery and improved customer experience.
• Stay informed about the latest product offerings and retail trends to assist customers effectively.

Requirements

Senior Software Engineer, Admin Platform

Location: Hybrid in Seattle, WA

Compensation: $190,000 - $205,000 (Base Salary) + Equity

We are a leading workplace platform transforming modern workplaces for hybrid work across over 20,000 locations globally. Our platform redefines how companies manage visitors, desks, rooms, and deliveries. We are seeking an exceptional Senior Software Engineer to join the Admin Platform (AMP) team, which builds mission-critical features (like SCIM, SSO, and Custom Roles) for our largest enterprise customers, directly impacting company revenue and customer delight.

This is a high-impact, back-end focused role that involves working on a variety of customer-facing features and key architectural challenges related to enterprise scale, security, and performance. You will be a technical leader, driving innovation in the hybrid workplace.

You will: