Senior Backend Engineer

Location: US or Europe (Must have solid overlap with EST)

Remote | Full-time

Compensation: $150K - $200K

Our client is an industry-leading DeFi organization building the next generation of trading infrastructure. Operating as the largest builder-code product on a major decentralized exchange protocol, the company has processed over $65B in cumulative trading volume and generated eight-figure revenue over the past year. With a user base exceeding 400,000 registered traders, the platform is at the forefront of democratizing access to global financial markets across crypto, equities, and commodities.

The organization operates as a lean, highly technical team of individual contributors who prioritize autonomy, ownership, and rapid execution. This environment is designed for a Senior Backend Engineer who thrives in 0-to-1 environments and is capable of building ambitious systems from the ground up. This role is central to scaling trading interfaces that manage billions of dollars in daily volume while maintaining high-speed, intuitive user experiences.

Key Responsibilities

Company Introduction:

Apex is a growing agency focused on Conversion Rate Optimization (CRO), aimed at boosting client sales without increasing ad budgets. We work with top e-commerce brands to enhance their websites, using data and proven strategies to drive growth.

With a solid record of delivering results, we combine technical skills with a focus on improving user experience. As we expand, we offer opportunities to work with a talented team, solving challenges and applying advanced CRO methods.

If you’re looking to make a difference and help e-commerce businesses grow, alongside a team of driven professionals, consider joining the Apex team.

About the Role 

The Conversion Rate Optimization Expert is responsible for enhancing the performance of our clients’ websites by implementing data-driven strategies that maximize their conversion rates. 

This position plays a key role in analyzing user behavior, identifying optimization opportunities, and implementing changes to improve overall site performance. You will collaborate closely with copywriters, designers, web developers, and other team members.

Company Introduction:

Apex is a growing agency focused on Conversion Rate Optimization (CRO), aimed at boosting client sales without increasing ad budgets. We work with top e-commerce brands to enhance their websites, using data and proven strategies to drive growth.

With a solid record of delivering results, we combine technical skills with a focus on improving user experience. As we expand, we offer opportunities to work with a talented team, solving challenges and applying advanced CRO methods.

If you’re looking to make a difference and help e-commerce businesses grow, alongside a team of driven professionals, consider joining the Apex team.

About the Role 

The Conversion Rate Optimization Expert is responsible for enhancing the performance of our clients’ websites by implementing data-driven strategies that maximize their conversion rates. 

This position plays a key role in analyzing user behavior, identifying optimization opportunities, and implementing changes to improve overall site performance. You will collaborate closely with copywriters, designers, web developers, and other team members.

Company Introduction:

Apex is a growing agency focused on Conversion Rate Optimization (CRO), aimed at boosting client sales without increasing ad budgets. We work with top e-commerce brands to enhance their websites, using data and proven strategies to drive growth.

With a solid record of delivering results, we combine technical skills with a focus on improving user experience. As we expand, we offer opportunities to work with a talented team, solving challenges and applying advanced CRO methods.

If you’re looking to make a difference and help e-commerce businesses grow, alongside a team of driven professionals, consider joining the Apex team.

About the Role 

The Conversion Rate Optimization Expert is responsible for enhancing the performance of our clients’ websites by implementing data-driven strategies that maximize their conversion rates. 

This position plays a key role in analyzing user behavior, identifying optimization opportunities, and implementing changes to improve overall site performance. You will collaborate closely with copywriters, designers, web developers, and other team members.

Company Introduction:

Apex is a growing agency focused on Conversion Rate Optimization (CRO), aimed at boosting client sales without increasing ad budgets. We work with top e-commerce brands to enhance their websites, using data and proven strategies to drive growth.

With a solid record of delivering results, we combine technical skills with a focus on improving user experience. As we expand, we offer opportunities to work with a talented team, solving challenges and applying advanced CRO methods.

If you’re looking to make a difference and help e-commerce businesses grow, alongside a team of driven professionals, consider joining the Apex team.

About the Role 

The Conversion Rate Optimization Expert is responsible for enhancing the performance of our clients’ websites by implementing data-driven strategies that maximize their conversion rates. 

This position plays a key role in analyzing user behavior, identifying optimization opportunities, and implementing changes to improve overall site performance. You will collaborate closely with copywriters, designers, web developers, and other team members.

Company Introduction:

Apex is a growing agency focused on Conversion Rate Optimization (CRO), aimed at boosting client sales without increasing ad budgets. We work with top e-commerce brands to enhance their websites, using data and proven strategies to drive growth.

With a solid record of delivering results, we combine technical skills with a focus on improving user experience. As we expand, we offer opportunities to work with a talented team, solving challenges and applying advanced CRO methods.

If you’re looking to make a difference and help e-commerce businesses grow, alongside a team of driven professionals, consider joining the Apex team.

About the Role 

The Conversion Rate Optimization Expert is responsible for enhancing the performance of our clients’ websites by implementing data-driven strategies that maximize their conversion rates. 

This position plays a key role in analyzing user behavior, identifying optimization opportunities, and implementing changes to improve overall site performance. You will collaborate closely with copywriters, designers, web developers, and other team members.

Company Introduction:

Apex is a growing agency focused on Conversion Rate Optimization (CRO), aimed at boosting client sales without increasing ad budgets. We work with top e-commerce brands to enhance their websites, using data and proven strategies to drive growth.

With a solid record of delivering results, we combine technical skills with a focus on improving user experience. As we expand, we offer opportunities to work with a talented team, solving challenges and applying advanced CRO methods.

If you’re looking to make a difference and help e-commerce businesses grow, alongside a team of driven professionals, consider joining the Apex team.

About the Role 

The Conversion Rate Optimization Expert is responsible for enhancing the performance of our clients’ websites by implementing data-driven strategies that maximize their conversion rates. 

This position plays a key role in analyzing user behavior, identifying optimization opportunities, and implementing changes to improve overall site performance. You will collaborate closely with copywriters, designers, web developers, and other team members.

Company Introduction:

Apex is a growing agency focused on Conversion Rate Optimization (CRO), aimed at boosting client sales without increasing ad budgets. We work with top e-commerce brands to enhance their websites, using data and proven strategies to drive growth.

With a solid record of delivering results, we combine technical skills with a focus on improving user experience. As we expand, we offer opportunities to work with a talented team, solving challenges and applying advanced CRO methods.

If you’re looking to make a difference and help e-commerce businesses grow, alongside a team of driven professionals, consider joining the Apex team.

About the Role 

The Conversion Rate Optimization Expert is responsible for enhancing the performance of our clients’ websites by implementing data-driven strategies that maximize their conversion rates. 

This position plays a key role in analyzing user behavior, identifying optimization opportunities, and implementing changes to improve overall site performance. You will collaborate closely with copywriters, designers, web developers, and other team members.

Front End Engineer (Product Engineer)

Location: New York, NY

On-Site | Full-time

Compensation: $200K/yr - $325K/yr

Our client is a high-growth fintech firm building the next generation of trading and portfolio management technology. Founded by industry veterans from top-tier quant shops, the organization has secured over $100M in funding to rethink how financial institutions manage trillions in assets. The core product suite handles everything from high-throughput market data to complex portfolio optimization. Our client is looking for a driven Engineer to help build the performant, data-rich interfaces that power these mission-critical workflows.

You will own the user experience for platforms that handle massive data scale and complex financial operations. This isn't just about building "dashboards"—it's about engineering intuitive interfaces for real-time position tracking, smart order routing, and high-cardinality optimization.

Key Responsibilities

Design Engineer

Location: Based in San Francisco or North or South America

Onsite or Remote | Full-time

Compensation

• Design Engineer (Onsite in San Francisco) - $140K – $200K • 0.05% – 0.25%
• Design Engineer (remote in the Americas) - $100K – $180K • 0.05% – 0.25%

Our client is a high-growth, venture-backed organization building a generational open-source security infrastructure platform for the AI era. Trusted by engineers at world-class companies such as Hugging Face and LG, the platform manages billions of secrets, certificates, and credentials every month.

The engineering team are seeking talented Design Engineers based in either the Americas or San Francisco to own and elevate the user-facing experience of this rapidly growing platform. Our client views developer experience as a core product philosophy and obsesses over intuitive design and polished interfaces. This role is ideal for a deeply technical individual who possesses a sharp eye for aesthetics and the ability to build features end-to-end, with a heavy focus on frontend excellence (approximately 70%) and a supporting contribution to the backend (approximately 30%).

Key Responsibilities