Senior Full Stack Engineer (JavaScript, Payments, Scalable Systems)
Senior Full Stack Engineer (JavaScript, Payments, Scalable Systems)

Senior Full Stack Engineer (JavaScript, Payments, Scalable Systems)

Littlehampton Full-Time 43200 - 72000 £ / year (est.) No home office possible
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At a Glance

  • Tasks: Build and scale secure payment systems while designing full-stack features.
  • Company: Join EQUALS TRUE, a remote-first company committed to inclusivity and fairness in tech.
  • Benefits: Enjoy flexible salary options, paid holidays, wellness benefits, and free language classes.
  • Why this job: Be part of a mission-driven team that values diversity and innovation in technology.
  • Qualifications: Proven experience in full-stack JS applications and API integration, especially in fintech.
  • Other info: Open to all qualified candidates, promoting wage equality and accommodating disabilities.

The predicted salary is between 43200 - 72000 £ per year.

REMOTE FIRST, AND INCLUSIVE ALWAYS. EQUALS (=) TRUE started when a type design geek and a talent nerd decided to create real change in the technology industry workforce. So they built the first-in-industry authentic talent partner to help organizations build cultures and scale internationally with the best talent in the Americas. We are the only organization in Latin America that was founded with a commitment to be inclusive, treat individuals fairly, pay them equally, and provide them with a great professional experience each day, and only want the best. These values are what grounds our business model and practices each day.

We are different, awkward, techie, and weird people in all the right ways. So, if you’re looking for a new career partner who’s remote-first, has a true social mission, and only works with companies that share our values, let’s talk about our Senior Full Stack Engineer role today.

Here’s what you need to know about this position:

THE WORK
  • Build and scale robust payment agents that handle sensitive financial and health data securely.
  • Design and ship full-stack features across patient flows, provider dashboards, and internal tools.
  • Take ownership of architecture and implementation from concept to production.
  • Collaborate directly with the founder and early users to refine UX and business logic in real time.
  • Integrate complex APIs like Plaid, Finix, and Stripe to enable seamless transactions.
  • Set up foundational engineering practices, deployment pipelines, and compliance workflows.
  • Contribute to a thoughtful, product-minded engineering culture as one of the early builders.
NEEDED EXPERTISE
  • Proven experience building and scaling full-stack JS applications with intuitive UX and well-structured business logic.
  • Comfortable thriving in fast-paced, early-stage startup environments with high ambiguity and high bias for disruption.
  • Demonstrated ability to independently own and deliver production-ready features from start to finish.
  • Product-minded approach with a keen eye for usability, performance, and real-world impact.
  • Hands-on experience integrating third-party APIs, especially in payments and fintech domains.
  • Bonus points for experience with HIPAA-compliant systems, healthcare technology, or RPA tools.
  • Strong history of establishing/working with standards such as peer review, peer coding, clear documentation, 80%+ code coverage automated testing, and more.
OUR BENEFITS & PERKS
  • We pay in USD on a platform that allows you to convert, allocate and disburse your salary as you want and into almost any currency that you choose.
  • Paid Company Holidays.
  • Medical, Safety, & Wellness benefits.
  • Free live business language classes.
  • Being part of an organization with a strong social mission for inclusion, fairness, and belonging.
  • …and more perks being added all the time.

Interested? Great! Please send us your CV/Resume to start the conversation and learn more about each other.

EQUALS TRUE is a global inclusive talent network of like-minded software engineers, agileist, and design thinkers. We build and develop safe, inclusive, equitable and balanced teams for companies that need to scale globally in a socially responsible way. EQUALS TRUE is open to all qualified candidates. We never evaluate qualified people on anything other than their skills, work history, training, and ability to do the job. We respect the right of people to live the life they want without judgements. So we practice wage equality, create a culture of belonging, insist upon respect for all our people, make every effort to accommodate all disabilities, and work only with companies that share our values. We are proud to be a global equal opportunity employer. And as such we never discriminate based on race, religion, color, national origin, disability, sexual orientation, gender, gender identity, status as a veteran, or any other protected status. We also consider qualified applicants with non-violent and non-financial related criminal histories. Additionally, EQUALS TRUE is committed to providing reasonable accommodations for candidates with disabilities throughout our hiring processes. If you need any assistance or accommodations due to a disability, please let us know.

Senior Full Stack Engineer (JavaScript, Payments, Scalable Systems) employer: equalstrue

At EQUALS TRUE, we pride ourselves on being a remote-first and inclusive employer that champions fairness and equality in the tech industry. Our unique culture fosters collaboration and innovation, providing employees with opportunities for professional growth while working on impactful projects in a supportive environment. With competitive benefits, including flexible salary options and wellness programs, we are dedicated to creating a workplace where every individual can thrive and contribute to our social mission.
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Contact Detail:

equalstrue Recruiting Team

StudySmarter Expert Advice 🤫

We think this is how you could land Senior Full Stack Engineer (JavaScript, Payments, Scalable Systems)

✨Tip Number 1

Familiarise yourself with the latest trends in full-stack JavaScript development, especially around payment systems. Being well-versed in technologies like Plaid, Finix, and Stripe will give you an edge during discussions.

✨Tip Number 2

Showcase your experience with scalable systems and how you've handled sensitive data in previous roles. Prepare specific examples that highlight your ability to maintain security and compliance, particularly in fintech or healthcare.

✨Tip Number 3

Engage with the company's mission and values. Research their commitment to inclusion and fairness, and be ready to discuss how your personal values align with theirs during any conversations.

✨Tip Number 4

Network with current or former employees of Equals True on platforms like LinkedIn. Gaining insights from their experiences can provide you with valuable information to tailor your approach and demonstrate your genuine interest.

We think you need these skills to ace Senior Full Stack Engineer (JavaScript, Payments, Scalable Systems)

Full Stack JavaScript Development
Payment Systems Integration
API Integration (Plaid, Finix, Stripe)
UX Design and Usability
Scalable System Architecture
Agile Methodologies
Production-Ready Feature Delivery
Compliance with HIPAA Standards
Automated Testing and Code Coverage
Documentation and Peer Review Practices
Problem-Solving in Fast-Paced Environments
Collaboration with Cross-Functional Teams
Adaptability to Ambiguity
Product-Minded Approach

Some tips for your application 🫡

Tailor Your CV: Make sure your CV highlights your experience with full-stack JavaScript applications, especially in payments and fintech. Emphasise any relevant projects where you've integrated APIs like Plaid, Finix, or Stripe.

Craft a Compelling Cover Letter: In your cover letter, express your passion for building inclusive technology and how your values align with those of EQUALS TRUE. Mention specific examples of how you've contributed to product-minded engineering cultures in the past.

Showcase Relevant Experience: Detail your hands-on experience with HIPAA-compliant systems or healthcare technology if applicable. Highlight your ability to work independently in fast-paced environments and your history of delivering production-ready features.

Proofread and Format: Before submitting your application, ensure that your documents are free from errors and formatted professionally. A clean, well-organised application reflects your attention to detail and professionalism.

How to prepare for a job interview at equalstrue

✨Showcase Your Full-Stack Experience

Be prepared to discuss your previous projects where you've built and scaled full-stack JavaScript applications. Highlight specific features you developed, focusing on usability and performance.

✨Demonstrate API Integration Skills

Since the role involves integrating complex APIs like Plaid, Finix, and Stripe, come ready to explain your experience with third-party API integrations, particularly in payments and fintech.

✨Emphasise Your Product-Minded Approach

Discuss how you prioritise user experience and business logic in your work. Share examples of how your contributions have had a real-world impact on users or clients.

✨Prepare for Cultural Fit Questions

Given the company's strong social mission and values, be ready to talk about how your personal values align with theirs. Reflect on your experiences in inclusive environments and how you contribute to a positive team culture.

Senior Full Stack Engineer (JavaScript, Payments, Scalable Systems)
equalstrue
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  • Senior Full Stack Engineer (JavaScript, Payments, Scalable Systems)

    Littlehampton
    Full-Time
    43200 - 72000 £ / year (est.)

    Application deadline: 2027-07-10

  • E

    equalstrue

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