Front End Developer

Movable Ink

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Location: Costa Rica
Job Type: full-time
Salary: $185k – $210k
Posted: April 21, 2026

Job Description

Movable Ink scales content personalization for marketers through data-activated content generation and AI decisioning. The world’s most innovative brands rely on Movable Ink to maximize revenue, simplify workflow and boost marketing agility. Headquartered in New York City with close to 600 employees, Movable Ink serves its global client base with operations throughout North America, Central America, Europe, Australia, and Japan.

As a Front End Developer at Movable Ink, you’ll partner with some of the world’s most recognized brands, helping them bring dynamic, real-time marketing experiences to life across email, web, mobile, and display channels. You’ll work within a flexible React-based framework but spend most of your time writing vanilla JavaScript, HTML, and CSS to create polished, custom solutions that deliver immediate business impact for clients. Projects are short-cycle, varied, and collaborative, requiring creativity, technical craftsmanship, and clear communication. Think smaller, purpose-built applications in a fast-paced, agency-like environment.

Responsibilities:

Collaborate with Client Experience Managers and Solutions Architects to scope and define technical requirements for client projects
Build, test, and deliver client-specific apps and dynamic experiences on top of the Movable Ink Platform
Translate designs and ideas into functional, production-ready email/web/mobile experiences
Provide input on feasibility and UX improvements during the design phase
Balance multiple projects at once with autonomy and ownership, delivering on time and upholding code quality
Troubleshoot and support deployed client projects as needed

Qualifications:

2+ years of experience writing client-side technologies (JavaScript, HTML, CSS)
Strong vanilla JavaScript fundamentals; React knowledge is a plus, but not the core of your daily work
Experience working in an environment where priorities shift and projects are short-term and highly varied (agency or consulting experience is a plus)
Familiarity with consuming REST APIs and working with dynamic data
Strong UX sensibility and attention to detail
Experience with automated testing tools (Jest, Karma, etc.) is a plus
Strong time management skills and ability to work independently on multiple concurrent projects in a dynamic, client-facing environment

Studies have shown that women, communities of color, and historically underrepresented people are less likely to apply to jobs unless they meet every single qualification. We are committed to building a diverse and inclusive culture where all Inkers can thrive. If you’re excited about the role but don’t meet all of the abovementioned qualifications, we encourage you to apply. Our differences bring a breadth of knowledge and perspectives that makes us collectively stronger.

We welcome and employ people regardless of race, color, gender identity or expression, religion, genetic information, parental or pregnancy status, national origin, sexual orientation, age, citizenship, marital status, ethnicity, family or marital status, physical and mental ability, political affiliation, disability, Veteran status, or other protected characteristics. We are proud to be an equal opportunity employer.

🎯 Who is this job for?

This role suits a Junior/Middle Frontend Developer with 2+ years of experience working with JavaScript, HTML, and CSS in fast-paced, client-facing environments. You need strong vanilla JavaScript skills, basic React knowledge, experience with REST APIs, and the ability to build dynamic, user-focused marketing experiences. The candidate should be familiar with handling multiple short-term projects, translating designs into production-ready UI, and collaborating closely with non-engineering stakeholders.

💬 Potential Interview Questions

How would you build dynamic client-side experiences using mostly vanilla JavaScript, HTML, and CSS while keeping the code maintainable?
I would organize the code into small reusable modules, separate rendering logic from data handling, and follow consistent naming and styling conventions. Even in vanilla JavaScript, maintainability comes from clear structure and predictable patterns.
What should you consider when building dynamic marketing content that needs to work across email, web, mobile, and display channels?
Each channel has different technical constraints, especially email clients, so I would design for progressive enhancement and test compatibility early. The goal is to deliver a consistent experience while respecting channel-specific limitations.
How do you consume REST APIs and safely render dynamic data in frontend applications?
I fetch the data asynchronously, validate the response structure, and handle loading and error states explicitly. I also sanitize and safely inject dynamic content to avoid rendering issues or security risks.
How would you approach translating a design into a production-ready frontend experience for a client?
I would first identify the reusable layout and interaction patterns, then implement the UI with attention to spacing, responsiveness, and behavior. I also review feasibility early and suggest UX improvements where technical constraints or usability issues appear.
What are common challenges when working in a fast-paced, client-facing environment with multiple short-cycle projects?
The biggest challenges are shifting priorities, context switching, and balancing speed with quality. I manage them through strong time management, clear communication, and breaking work into well-defined deliverables.
How do you test frontend experiences built with vanilla JavaScript?
I test critical logic with unit tests where possible and verify rendering and behavior through manual and automated functional testing. For dynamic content, cross-browser and cross-device validation are especially important.
What would you do to ensure high-quality HTML and CSS in a client project?
I would focus on semantic HTML, responsive layouts, reusable CSS patterns, and visual consistency with the design. Clean structure and careful QA help prevent regressions and make future updates easier.
How do you troubleshoot issues in deployed client-side applications?
I reproduce the issue, inspect network requests and browser behavior, and isolate whether the problem comes from data, rendering, or environment-specific constraints. Then I apply the fix carefully and retest affected scenarios.
When is React useful in a frontend role where vanilla JavaScript is the main tool?
React is useful when the UI becomes more stateful, component-driven, or complex over time. For smaller, purpose-built experiences, vanilla JavaScript can often be faster and more appropriate, so the choice depends on project scope.
How do you balance UX quality with fast delivery for short-term custom client solutions?
I prioritize the core user flow first, make sure the experience is polished in the most important touchpoints, and avoid overengineering. That helps deliver quickly without sacrificing the details that affect usability and client satisfaction.

📋 Job Summary

Movable Ink is a global marketing tech company helping top brands deliver personalized, data-driven content experiences across digital channels. They are hiring a Front End Developer to build dynamic client-facing solutions using JavaScript, HTML, CSS, and a React-based framework, working on fast-paced, short-cycle projects that power real-time marketing experiences. This role is based in Costa Rica and offers exposure to diverse projects in a collaborative, agency-like environment. It’s a great opportunity to work closely with global brands, see immediate impact from your work, and grow in a creative, high-ownership setting.