Senior Full Stack Engineer - Core UX

📍 Job Overview

Job Title: Senior Full Stack Engineer - Core UX

Company: Jobgether (Partner Company)

Location: Netherlands

Job Type: Full-time, Contractor

Category: Engineering - Full Stack Development / User Experience

Date Posted: 2026-09-30

Experience Level: Senior (5+ years)

Remote Status: Fully Remote

🚀 Role Summary

• Drive significant improvements in user experience through refinement of existing product functionality, focusing on usability, consistency, responsiveness, and visual quality.

• Develop and maintain scalable full-stack solutions that underpin reliable, high-performance user interfaces, leveraging modern engineering principles.

• Implement sophisticated frontend interactions and layouts, ensuring a cohesive and polished user experience across the entire product suite.

• Collaborate closely with a multidisciplinary team of full-stack, data, machine learning, and DevOps engineers to evolve product capabilities and system architecture.

• Take full ownership of projects from concept to completion, with substantial individual contribution directly impacting product quality and business outcomes.

📝 Enhancement Note: The role emphasizes "Core UX" and "iterative improvement, experimentation, and delivering a premium user experience," indicating a strong focus on user-centric design and continuous enhancement of the user interface and interaction layer. This is distinct from roles that might focus solely on new feature development or backend infrastructure.

📈 Primary Responsibilities

• Enhance existing product features with a keen eye for usability, visual consistency, responsiveness, and overall performance.

• Architect, build, and maintain robust full-stack systems designed for scalability and reliability, directly supporting a premium user experience.

• Develop and integrate intricate frontend interactions and layouts, ensuring a seamless and high-quality user journey across all touchpoints.

• Partner with cross-functional engineering teams (Full-stack, Data, ML, DevOps) to design, implement, and iterate on product features and underlying infrastructure.

• Actively participate in system design discussions, debugging complex issues, optimizing performance across the stack, and resolving challenging technical problems.

• Assume end-to-end ownership of projects, driving them from ideation through successful implementation with minimal supervision.

• Proactively experiment with new technical and product approaches, rigorously measure outcomes, and rapidly iterate to enhance functionality and user impact.

• Maintain transparent and proactive communication with stakeholders, effectively surface blockers, seek necessary clarifications, and provide timely project updates.

• Contribute to the development of scalable cloud-native architectures, implement asynchronous workflows, and ensure the reliability of backend solutions as the product scales.

📝 Enhancement Note: The responsibilities highlight a blend of frontend and backend expertise with a strong emphasis on ownership and iterative improvement. The role is suited for an engineer who can not only build but also strategically enhance existing user-facing elements and contribute to the underlying scalable architecture.

🎓 Skills & Qualifications

Education: While no specific degree is mandated, a strong foundation in Computer Science or a related technical field is implied by the experience and technical requirements. Candidates with equivalent practical experience will be strongly considered.

Experience: 5+ years of professional software engineering experience with a demonstrated history of improving and polishing product functionality and user experiences.

Required Skills:

• Frontend Expertise: Professional experience with a modern frontend framework, with a strong preference for React.

• Programming Languages: Proficient in JavaScript and TypeScript; strong object-oriented programming (OOP) fundamentals are essential. Candidates with strong Python OOP experience will also be considered.

• Full-Stack Development: Experience building and maintaining scalable full-stack solutions.

• Cloud & Serverless Technologies: Experience with cloud platforms and serverless functions, specifically AWS Lambda and EC2.

• Database Proficiency: Comfortable working with relational databases, ideally PostgreSQL.

• System Design & Architecture: Strong engineering fundamentals in system design, debugging, architecture, and problem-solving.

• Asynchronous Workflows: Experience with asynchronous workflows and cloud-based environments.

• Ownership & Drive: A strong ownership mindset with the ability to independently drive projects to completion while maintaining high quality standards.

• Communication: Proactive and transparent communication style, capable of effective collaboration in a distributed international team.

• Agility & Iteration: Comfort with experimenting, testing ideas, measuring results, and iterating rapidly on complex or unfamiliar problems.

Preferred Skills:

• Experience with LLMs (Large Language Models), generative AI, or distributed systems.

• Experience working with Python in an object-oriented context.

📝 Enhancement Note: The "Requirements" section implies a need for engineers who can operate effectively across the entire stack, from UI implementation to backend services and cloud infrastructure. The emphasis on "Core UX" suggests that a deep understanding of user interaction patterns and frontend best practices is paramount, even for a full-stack role. The mention of Python alongside JavaScript/TypeScript indicates flexibility in backend language preference, provided OOP principles are strong.

📊 Process & Systems Portfolio Requirements

Portfolio Essentials:

• Case Studies of UX/UI Improvements: Showcase specific instances where you identified user experience friction points and implemented technical solutions to improve usability, performance, or visual appeal. Quantify the impact where possible (e.g., reduction in user errors, improvement in task completion time, increased engagement metrics).

• Full-Stack Project Examples: Present projects demonstrating your ability to build and deploy end-to-end solutions, highlighting the integration of frontend (React) and backend components, database interactions, and cloud deployment.

• System Design Artifacts: Include diagrams or descriptions of system architectures you've designed or significantly contributed to, particularly those involving scalability, cloud deployment (AWS, serverless), and asynchronous processing.

• Code Samples: Provide access to well-structured, maintainable code demonstrating proficiency in JavaScript/TypeScript, React, and potentially Python, with a focus on clean architecture and best practices.

Process Documentation:

• Workflow Optimization Examples: Detail processes you’ve optimized, focusing on how you leveraged technology to streamline workflows, reduce manual effort, or improve efficiency within a development or product lifecycle.

• Debugging & Problem-Solving Methodologies: Illustrate your systematic approach to identifying, diagnosing, and resolving complex technical issues across different layers of an application stack.

• Agile Development & Iteration: Demonstrate experience with agile methodologies, rapid prototyping, A/B testing, and iterative development cycles, showcasing how you incorporate feedback and data to refine solutions.

📝 Enhancement Note: Given the "Core UX" focus and the requirement for engineers to drive initiatives from concept through completion, a portfolio demonstrating not just technical skill but also a user-centric approach and end-to-end project ownership is crucial. The emphasis on "refinement" and "improvement" suggests a need for candidates who can articulate their impact on existing systems, not just new builds.

💵 Compensation & Benefits

Salary Range: Approximately $80,000–$165,000 USD per year. The exact figure will depend on the candidate's experience, performance, and geographic location, reflecting the cost of living and market rates within European countries.

Benefits:

• Equity: Significant equity options package, offering potential for long-term financial upside.

• Paid Time Off: 20 days of paid time off per year, providing ample opportunity for rest and rejuvenation.

• Global Connectivity: Opportunities for global team offsites and international connection with colleagues.

• Reimbursements: Phone reimbursement, gym reimbursement, and a student stipend, supporting professional development and well-being.

• Ownership & Impact: High level of ownership and the opportunity to make a substantial impact within a growth-stage environment.

Working Hours: The role is full-time, typically implying around 40 hours per week. Flexibility is expected given the remote and international nature of the team, with a focus on output and collaboration rather than strict adherence to a 9-to-5 schedule.

📝 Enhancement Note: The salary range is presented in USD but is intended to be adjusted based on the candidate's location within Europe. This requires candidates to research local market rates for senior full-stack engineers in their specific country to better understand the positioning within this range. The benefits package is competitive, with a strong emphasis on equity and remote work support.

🎯 Team & Company Context

🏢 Company Culture

Industry: The company operates within the technology sector, likely focusing on SaaS or business-critical software solutions given the mention of "sophisticated, business-critical software" and "major global industry."

Company Size: While not explicitly stated, the mention of "growth-stage environment," "ambitious, international, and multidisciplinary team," and "substantial equity options" suggests a dynamic startup or scale-up environment, likely in the Series A to Series C funding stage. This implies a lean, agile, and fast-paced operational setting.

Founded: The founding date is not provided, but the company's growth stage implies it is established enough to have a core product and is actively scaling its engineering and product teams.

Team Structure:

• Core UX Engineering Team: The role is part of a dedicated team focused on User Experience within the engineering department.

• Cross-Functional Collaboration: Close interaction with full-stack, data, ML, and DevOps engineers, indicating a collaborative, integrated product development approach.

• Distributed International Environment: The team is global, requiring strong asynchronous communication skills and cultural awareness.

Methodology:

• AI-Powered Matching: Jobgether utilizes AI for initial candidate screening, ensuring objective and efficient review.

• Iterative Development: Emphasis on iterative improvement, experimentation, and rapid iteration to enhance functionality and user impact.

• Data-Driven Decisions: Outcomes are measured and analyzed to inform rapid iteration and product refinement.

• Ownership Culture: High degree of individual ownership and responsibility for projects.

Company Website: https://jobgether.com/ (Jobgether is the platform; the actual partner company's website is not directly provided but can be inferred to be in a related tech/SaaS space.)

📝 Enhancement Note: The description of Jobgether's AI matching process suggests that candidates should ensure their application materials are clear, concise, and directly address the core requirements to pass the initial automated screening. The partner company's culture is described as growth-oriented, collaborative, and data-driven, with a strong emphasis on UX.

📈 Career & Growth Analysis

Operations Career Level: This is a Senior Engineer role, demanding significant autonomy, technical depth, and the ability to influence product direction. It sits above mid-level engineering roles and requires leadership in technical execution and problem-solving.

Reporting Structure: The candidate will report into an engineering management role (e.g., Engineering Manager, Director of Engineering) within the partner company. They will work closely with product managers and other engineering leads.

Operations Impact: As a Senior Full Stack Engineer focused on Core UX, the impact is direct on user satisfaction, product adoption, and retention. By improving usability and performance, the engineer contributes significantly to the company's ability to acquire and retain customers, thereby driving revenue growth and business success.

Growth Opportunities:

• Technical Specialization: Deepen expertise in React, cloud-native architectures, or emerging AI technologies.

• Leadership Development: Potential to transition into Tech Lead roles, mentoring junior engineers and guiding technical strategy for specific product areas.

• Product Strategy Influence: Contribute to product roadmap discussions and architectural decisions based on UX insights and technical feasibility.

• Cross-Functional Learning: Gain exposure to data science, machine learning, and DevOps practices through close collaboration.

📝 Enhancement Note: The role offers a clear path for technical leadership and specialized growth within a dynamic startup environment. The emphasis on "ownership" and "substantial impact" suggests that high performers will be recognized and provided with opportunities for advancement.

🌐 Work Environment

Office Type: Fully Remote. This role is designed for individuals who can work effectively from their home office or a co-working space.

Office Location(s): The role requires the candidate to be based in a European country where they are authorized to work. This is a key requirement for contractor engagements without visa sponsorship.

Workspace Context:

• Remote Collaboration Tools: Expect extensive use of digital collaboration tools (e.g., Slack, Zoom, Notion, Jira) for communication, project management, and knowledge sharing.

• Flexible Work Schedule: While full-time, the remote nature and international team structure allow for flexibility in working hours, provided deliverables are met and team collaboration is maintained.

• Autonomy and Self-Management: The environment fosters high levels of autonomy, requiring strong self-discipline and time management skills.

Work Schedule: Full-time, likely around 40 hours per week. The distributed nature of the team means that asynchronous communication will be key, but scheduled meetings for collaboration and sync-ups will occur.

📝 Enhancement Note: Candidates must be comfortable with a fully remote setup and possess the necessary infrastructure (reliable internet, dedicated workspace) to perform effectively. The requirement to be based in Europe and authorized to work is a strict non-negotiable.

📄 Application & Portfolio Review Process

Interview Process:

• AI Screening (Jobgether): Initial application review by Jobgether's AI to assess core fit against requirements.

• Hiring Company Review: Shortlisted candidates are passed to the partner company's internal hiring team for further evaluation.

• Technical Assessment/Coding Challenge: Expect a practical challenge, potentially involving frontend development (React), backend logic, or system design, focused on the "Core UX" aspect.

This may be an online assessment or a take-home project.

• Technical Interviews: Multiple rounds of interviews with engineering peers and management. These will likely cover:

  • Deep dives into past projects and technical challenges.
  • System design scenarios, focusing on scalability, performance, and UX.
  • Behavioral questions assessing collaboration, problem-solving, and ownership.

• Final Interview: Potentially with a senior leader to assess cultural fit and strategic alignment.

Portfolio Review Tips:

• Highlight UX Impact: For each project, clearly articulate the user problem, your technical solution, and the measurable impact on user experience or business metrics.

• Showcase Full-Stack Integration: Demonstrate how your frontend contributions integrate with backend services, databases, and cloud infrastructure.

• Structure for Clarity: Organize your portfolio logically, perhaps by project type or skill area, with concise descriptions and clear calls to action (e.g., link to GitHub, demo).

• Quantify Achievements: Wherever possible, use numbers and data to demonstrate the scale of your work and the success of your contributions.

• Tailor to Core UX: Emphasize projects where you significantly improved user interfaces, workflows, or interaction patterns.

Challenge Preparation:

• Practice React & JavaScript: Be ready to code live or present solutions using React, JavaScript, and TypeScript. Focus on component design, state management, and performance optimization.

• Review System Design Principles: Prepare for questions on scalable architectures, microservices, cloud services (AWS Lambda/EC2), and database design, especially as they relate to user-facing features.

• Articulate Problem-Solving: Be ready to walk through your thought process for debugging complex issues, using specific examples from your experience.

• Prepare UX Scenarios: Think about how you would approach common UX challenges and how you would translate design mockups or user feedback into functional code.

📝 Enhancement Note: Given the AI screening and the focus on "Core UX," candidates should ensure their resume and portfolio explicitly highlight experience in refining user interfaces, improving performance, and driving user-centric development. The interview process will likely involve both technical depth and a strong understanding of user experience principles.

🛠 Tools & Technology Stack

Primary Tools:

• Frontend Framework: React (highly preferred), with strong JavaScript/TypeScript skills.

• Backend Languages: JavaScript/TypeScript, Python (OOP focus).

• Cloud Platform: AWS (specifically AWS Lambda, EC2).

• Databases: Relational databases, with a preference for PostgreSQL.

• Version Control: Git.

Analytics & Reporting:

• Internal Analytics: Likely utilizes tools for tracking user behavior, application performance, and feature adoption. Candidates should be prepared to discuss how they use data to inform development decisions.

• Performance Monitoring: Tools for monitoring application performance, latency, and error rates across the stack.

CRM & Automation:

• Project Management: Tools like Jira, Asana, or similar for task tracking and workflow management.

• Communication & Collaboration: Slack, Zoom, Google Workspace/Microsoft 365.

• CI/CD: Experience with continuous integration and continuous deployment pipelines is a plus, especially within AWS environments.

📝 Enhancement Note: Proficiency in React and the AWS ecosystem (Lambda, EC2) is critical. Experience with PostgreSQL and strong JavaScript/TypeScript skills are also foundational. Candidates should be prepared to discuss their experience with these technologies and how they've used them to build scalable, user-friendly applications.

👥 Team Culture & Values

Operations Values:

• User-Centricity: A deep commitment to understanding and improving the user experience as a primary driver of product success.

• Ownership & Accountability: Employees are expected to take full responsibility for their work and drive initiatives to completion.

• Data-Driven Iteration: Decisions are informed by data and experimentation, with a focus on continuous improvement.

• Collaboration & Transparency: Open communication and teamwork are essential, especially in a distributed international setting.

• Technical Excellence: A drive for high-quality code, robust architecture, and efficient solutions.

Collaboration Style:

• Asynchronous First: Due to the distributed nature, communication often relies on written updates, documentation, and asynchronous tools.

• Cross-Functional Integration: Close partnerships between engineering, product, and potentially design teams are vital for delivering cohesive user experiences.

• Feedback Culture: An environment where constructive feedback is welcomed and utilized for continuous improvement of both product and processes.

📝 Enhancement Note: The culture emphasizes autonomy, a strong focus on user experience, and collaborative problem-solving across different engineering disciplines. Candidates who thrive in a remote, fast-paced environment and can communicate effectively asynchronously will be a good fit.

⚡ Challenges & Growth Opportunities

Challenges:

• Balancing UX Polish with Scalability: The primary challenge will be refining user interfaces and interactions while ensuring the underlying architecture remains scalable and performant as the product grows.

• Navigating a Growth-Stage Environment: Adapting to rapid changes in priorities, tools, and team structure inherent in a scaling company.

• Effective Remote Collaboration: Maintaining strong communication and collaboration across different time zones and cultures without direct in-person interaction.

• Integrating Emerging Technologies: Potentially incorporating new technologies like LLMs or generative AI into the core product, requiring rapid learning and experimentation.

Learning & Development Opportunities:

• Advanced Frontend Techniques: Opportunities to master complex React patterns, performance optimization, and modern frontend tooling.

• Cloud Architecture Mastery: Deepen expertise in AWS serverless computing, microservices, and scalable cloud deployments.

• Product Strategy Input: Influence the product roadmap by providing technical insights and UX-driven feature recommendations.

• Mentorship: Potential to mentor junior engineers and grow into technical leadership roles.

📝 Enhancement Note: This role presents a significant opportunity for growth by tackling complex technical challenges related to user experience and scalability in a dynamic startup. The learning opportunities are substantial, particularly for engineers looking to deepen their full-stack and cloud expertise.

💡 Interview Preparation

Strategy Questions:

• "Describe a time you significantly improved the user experience of a product. What was the problem, your solution, and the impact?" (Focus on quantifiable results and your role.)

• "How would you approach building a new, complex UI component in React, considering performance, accessibility, and maintainability?" (Demonstrate your frontend architecture thinking.)

• "Walk us through your process for debugging a performance issue in a full-stack application." (Highlight your systematic approach and tool usage.)

• "How do you balance delivering new features with the need for ongoing UI refinement and technical debt reduction?" (Show your understanding of product vs. polish trade-offs.) Company & Culture Questions:

• "What interests you about working on 'Core UX' specifically, and how does that align with your career goals?" (Connect your passion for UX to the role.)

• "Describe your experience working in a fully remote, international team. How do you ensure effective communication and collaboration?" (Assess your remote work skills.)

• "How do you handle situations where you disagree with a technical decision or product direction?" (Evaluate your communication and collaboration style.)

• "How do you stay updated with the latest trends in frontend development and cloud technologies?" (Gauge your commitment to continuous learning.) Portfolio Presentation Strategy:

• Storytelling with Data: Frame your portfolio projects as narratives – problem, solution, outcome. Use data and metrics to support your claims of impact.

• Technical Depth Showcase: Be prepared to discuss the technical intricacies of your projects, including architectural choices, trade-offs, and challenges overcome.

• Focus on UX Contribution: Explicitly highlight your contributions to user experience improvements, even within broader full-stack projects.

• Concise and Clear: Present your work clearly and concisely, ensuring interviewers can quickly grasp your capabilities and achievements.

📝 Enhancement Note: Candidates should prepare to speak extensively about their experience with React, AWS, and system design, with a specific emphasis on how their work has positively impacted user experience. Demonstrating a proactive, problem-solving attitude and strong communication skills will be key.

📌 Application Steps

To apply for this Senior Full Stack Engineer - Core UX position:

• Submit your application through the Jobgether platform via the provided URL.

• Tailor your Resume: Ensure your resume clearly highlights your 5+ years of experience, specific achievements in full-stack development, strong React and JavaScript/TypeScript skills, and any contributions to improving user experience or application performance. Use keywords from the job description.

• Curate Your Portfolio: Prepare a portfolio (e.g., GitHub profile, personal website) that showcases relevant projects. Focus on demonstrating your full-stack capabilities, your work with React and AWS, and any specific examples of UX/UI refinement or performance improvements.

• Prepare Your Narrative: Be ready to articulate your experience and qualifications clearly, focusing on your ability to drive projects, collaborate effectively in a remote setting, and contribute to a high-quality user experience. Practice explaining your portfolio projects and technical challenges.

• Research the Company (if possible): While the partner company isn't named, research Jobgether's mission and how they leverage AI in hiring. Understand the general landscape of growth-stage SaaS companies to better frame your motivations and contributions.

⚠️ Important Notice: This enhanced job description includes AI-generated insights and operations industry-standard assumptions. All details should be verified directly with the hiring organization before making application decisions.