Senior Full Stack Developer

iO Associates - US; Florida; On-site; USD 130,000 - 140,000; Full time

Job summary

An established industry player is looking for a Senior Full Stack JavaScript Developer to enhance proprietary trading platforms for global clients. This role involves collaborating with cross-functional teams to create high-performance applications, utilizing your expertise in JavaScript, ReactJS, and Node.js. You'll contribute throughout the development lifecycle, from design to deployment, ensuring that solutions are scalable and user-centric. If you're passionate about technology and eager to make an impact in the financial sector, this is the perfect opportunity for you.

Qualifications

• 5+ years of experience with JavaScript, ReactJS, and Node.js.
• Strong understanding of relational databases and schema design.

Responsibilities

• Contribute to the full development lifecycle including design and support.
• Develop scalable and maintainable code for client-facing applications.

Skills

JavaScript

ReactJS

Node.js

HTML5

CSS3

SASS

SQL

Git

Unix/Linux

Real-time systems

Job description

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This range is provided by iO Associates - US. Your actual pay will be based on your skills and experience — talk with your recruiter to learn more.

Base pay range

$130,000.00/yr - $140,000.00/yr

Direct message the job poster from iO Associates - US

Lead Senior Consultant - Credit Union Recruitment

Senior Full Stack JavaScript Developer - FinTech

We are seeking an experienced Senior Full Stack JavaScript Developer to play a key role in the evolution and support of proprietary trading platforms used by global institutional clients. This is an exciting opportunity for someone passionate about building high-performance, user-centric solutions in a fast-paced financial technology environment.

The ideal candidate is highly proficient in JavaScript, with deep experience in ReactJS (v16+) and Node.js, and has a strong understanding of system design and application architecture. If you're eager to work on impactful solutions within the financial markets and enjoy building clean, scalable code, we'd love to speak with you.

Key Responsibilities

• Contribute across the full development lifecycle, including technical design, development, deployment, and production support

• Develop high-quality, scalable, and maintainable code for internal and client-facing applications

• Collaborate closely with trading, research, and engineering teams to design responsive, real-time applications

• Integrate solutions with core trading systems to support performance and scalability

• Assist in the development of white-label trading platforms tailored to client requirements

• Evaluate new technologies and contribute to architecture decisions that improve our stack

• Maintain and enhance CI/CD pipelines and system reliability

• Provide day-to-day support for the applications and help drive ongoing enhancements
  
  

Skills & Qualifications

• 5+ years of hands-on experience with JavaScript, including advanced skills in ReactJS and Node.js

• 4+ years of experience applying design principles and building responsive UIs with HTML5, CSS3, and SASS

• Strong understanding of relational databases (SQL) and best practices for schema design and data integrity

• Proficiency with Git for source control and experience working within CI/CD pipelines

• Experience working in Unix/Linux environments, particularly RHEL

• Exposure to NGINX, load balancing strategies, and network protocols (TCP/IP)

• Prior experience with real-time systems or applications handling high throughput data

• Background in FinTech or financial services is a strong plus

Seniority level

• Seniority level

  Mid-Senior level

Employment type

• Employment type

  Full-time

Job function

• Job function

  Information Technology

• Industries

  Capital Markets

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