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: Software Engineering, Core UX

Date Posted: 2026-09-04

Experience Level: 5-10 Years

Remote Status: Remote OK (Netherlands)

🚀 Role Summary

• Drive the refinement and enhancement of existing product functionality with a keen focus on usability, consistency, responsiveness, performance, and overall visual quality.

• Elevate the user experience by meticulously crafting layouts, interactions, interface behavior, and ensuring a high degree of product polish.

• Design, develop, debug, and maintain scalable full-stack solutions that directly support evolving product requirements and business objectives.

• Contribute significantly to frontend development utilizing modern frameworks, with a strong emphasis on React.

• Develop and maintain robust backend functionality, including serverless architectures, asynchronous workflows, and cloud-based services.

📝 Enhancement Note: This role is for a Senior Full Stack Engineer with a specialization in Core UX, implying a significant focus on user interface and user experience aspects of the product. The emphasis on "refine and enhance" suggests a mature product where incremental improvements and polish are key. The "Core UX team" designation indicates a dedicated group focused on the fundamental user interaction layer. The "partner company" aspect means Jobgether acts as an intermediary for application management.

📈 Primary Responsibilities

• Enhance product functionality with a strong focus on usability, consistency, responsiveness, performance, and visual quality.

• Improve the overall user experience through meticulous attention to layouts, interactions, interface behavior, and product polish.

• Design, develop, debug, and maintain scalable full-stack solutions that support evolving product requirements.

• Contribute to frontend development using modern frameworks, with React experience being particularly valuable.

• Develop and maintain backend functionality, including serverless architectures, asynchronous workflows, and cloud-based services.

• Work effectively with relational databases and contribute to reliable, scalable data solutions.

• Collaborate closely with full-stack, data, machine learning, and DevOps engineers across a globally distributed team.

• Take end-to-end ownership of projects, driving initiatives from initial problem definition through implementation and completion with minimal oversight.

• Proactively communicate progress, surface blockers, ask thoughtful questions, and keep relevant stakeholders informed.

• Experiment with new approaches, measure results, and iterate rapidly to solve complex or previously unsolved technical and product challenges.

• Contribute to a culture centered on high standards, customer impact, transparency, accountability, continuous experimentation, and technical excellence.

📝 Enhancement Note: The responsibilities emphasize a blend of core engineering tasks (design, develop, debug, maintain) with a strong UX overlay. The expectation of "end-to-end ownership" and "minimal oversight" clearly positions this as a senior-level role. The inclusion of "experiment with new approaches, measure results, and iterate rapidly" highlights an agile and data-informed development methodology.

🎓 Skills & Qualifications

Education: While not explicitly stated, a Bachelor's or Master's degree in Computer Science, Engineering, or a related field is typically expected for a Senior Engineer role. Equivalent practical experience will also be considered.

Experience: 5+ years of professional software engineering experience, with a demonstrated track record of improving and polishing product functionality to deliver a premium user experience.

Required Skills:

• Strong software engineering fundamentals, including system design, debugging, architecture, and structured problem-solving.

• Professional experience with a modern frontend framework, preferably React.

• Strong knowledge of JavaScript, TypeScript, and/or Python; candidates with equivalent experience in other object-oriented programming languages are also encouraged to apply.

• Experience with serverless technologies and cloud environments, including platforms or services such as AWS Lambda and EC2.

• Experience designing or working with asynchronous workflows and scalable backend systems.

• Solid experience with relational databases, ideally PostgreSQL.

• Strong attention to detail and a genuine appreciation for high-quality, polished user experiences.

• Demonstrated ownership, initiative, resilience, and the ability to drive projects forward with limited supervision.

• Excellent communication skills and a proactive approach to collaboration in a distributed, cross-functional environment.

• Comfort with experimenting, measuring outcomes, learning quickly, and iterating on challenging problems.

• Authorization to work in the European country where you are based; the role is offered through a B2B or contractor arrangement, and visa sponsorship is not available. Preferred Skills:

• Experience with LLMs, generative AI, or distributed systems.

• Ability to thrive in a fast-paced growth environment with ambitious goals and a high degree of responsibility.

📝 Enhancement Note: The requirements clearly define a senior-level full-stack engineer with a pronounced focus on frontend technologies (React) and cloud-native architectures (serverless, AWS). The emphasis on "polished user experiences" and "attention to detail" is critical for the Core UX aspect. The exclusion of visa sponsorship and the contractor arrangement are key practical considerations.

📊 Process & Systems Portfolio Requirements

Portfolio Essentials:

• Showcase of end-to-end full-stack projects, demonstrating expertise in both frontend and backend development.

• Examples of contributions to improving user experience, highlighting specific UI/UX enhancements and their impact.

• Demonstrations of scalable system designs, including architecture diagrams and explanations of how they handle load and complexity.

• Case studies detailing the implementation of serverless architectures, asynchronous workflows, or cloud-based services.

• Evidence of working with relational databases (e.g., PostgreSQL), including schema design and query optimization. Process Documentation:

• Documentation of how you approach problem-solving, including debugging methodologies and structured approaches to complex technical challenges.

• Examples of how you have driven projects from inception to completion with minimal oversight, detailing your project management and execution approach.

• Demonstrations of your experimentation process, including how you define hypotheses, measure outcomes, and iterate on solutions.

• Examples of how you have contributed to a culture of high standards, transparency, and continuous learning within a development team.

📝 Enhancement Note: While a formal portfolio isn't explicitly mandated, the emphasis on "demonstrated ownership," "initiative," and the ability to "drive projects forward" strongly implies that candidates should be prepared to showcase their work and problem-solving capabilities. This could be through a GitHub profile, personal website, or detailed project descriptions during the interview process. The focus is on tangible results and process ownership.

💵 Compensation & Benefits

Salary Range: $80,000 to $165,000 USD per year, depending on experience, performance, and geographic location (Netherlands).

Benefits:

• Significant equity options package.

• 20 days of paid time off per year.

• Global team offsites and opportunities to connect with colleagues internationally.

• Phone reimbursement.

• Gym reimbursement.

• Student stipend.

• Opportunity to work alongside ambitious, highly skilled professionals across engineering, data, machine learning, and DevOps.

• Significant individual impact within a small, high-performing team.

• Opportunity to work on challenging technology and AI problems while helping transform a major global industry.

• An environment that emphasizes ownership, experimentation, transparency, continuous learning, and measurable customer impact.

Working Hours: Approximately 40 hours per week. While remote, the role is based in the Netherlands, suggesting adherence to European working norms and time zones for collaboration.

📝 Enhancement Note: The salary range is provided in USD and is noted to be dependent on location, specifically within the Netherlands. The benefits package is comprehensive, including equity, PTO, and various reimbursements, reflecting a competitive offering for a senior contractor role. The "contractor arrangement" (B2B) is a crucial detail impacting employment status.

🎯 Team & Company Context

🏢 Company Culture

Industry: The company operates in a "complex, high-impact industry" and is building "sophisticated software and AI-powered solutions." This suggests a B2B SaaS or enterprise technology sector, likely dealing with significant data volumes or critical business processes, potentially in finance, logistics, or specialized enterprise solutions.

Company Size: The description mentions a "small, high-performing team" and "global engineering team," implying an organization that is growing but maintains a focused, agile structure. This suggests a dynamic environment where individual contributions are highly visible.

Founded: Not specified, but the mention of "growth environment" and "ambitious goals" indicates a company that is likely past its early startup phase and is in a scaling or expansion phase.

Team Structure:

• The role is part of the "Core UX team," which works alongside "full-stack, data, machine learning, and DevOps engineers."

• Collaboration is global and cross-functional.

• The team is described as "small" and "high-performing," suggesting a close-knit group with a strong emphasis on technical excellence and shared ownership. Methodology:

• Emphasis on user experience, consistency, responsiveness, performance, and visual quality.

• Full-stack development with modern frameworks (React) and backend technologies (serverless, cloud, async workflows).

• Data-driven decision-making through experimentation, measurement, and iteration.

• Strong software engineering fundamentals in system design, architecture, and debugging.

• High degree of ownership and end-to-end project responsibility.

• Collaborative environment with proactive communication.

Company Website: jobgether.com (for Jobgether's platform, not the partner company).

📝 Enhancement Note: The culture is described as emphasizing high standards, customer impact, transparency, accountability, continuous experimentation, and technical excellence. This points towards a meritocratic and results-oriented environment where engineers are empowered and expected to take initiative. The "partner company" aspect means direct cultural insights into the hiring company are limited, but Jobgether's platform emphasizes AI-powered matching and fairness.

📈 Career & Growth Analysis

Operations Career Level: Senior Full Stack Engineer - Core UX. This is a highly experienced individual contributor role focused on enhancing the user-facing aspects of a complex software product. It requires deep technical expertise in both frontend and backend development, coupled with a strong understanding of user experience principles.

Reporting Structure: While not explicitly detailed, senior engineers in small, high-performing teams often report to an Engineering Manager or Team Lead. The role requires significant autonomy and collaboration across multiple engineering disciplines (Data, ML, DevOps).

Operations Impact: The role has a direct impact on the user experience and product usability, which are critical drivers of customer adoption, retention, and satisfaction in any software product. By improving the core UX, this engineer will influence how users engage with the platform, directly affecting its success and the company's ability to achieve its business goals in a "high-impact industry."

Growth Opportunities:

• Technical Specialization: Deepen expertise in modern frontend frameworks (React), serverless architectures, cloud platforms (AWS), and potentially AI/ML integration.

• Leadership in UX: Become a key contributor and potential lead within the Core UX team, influencing product direction and engineering best practices for user experience.

• System Design & Architecture: Gain experience in designing and scaling complex systems for a critical industry, contributing to architectural decisions.

• Cross-functional Exposure: Work closely with Data Science, Machine Learning, and DevOps teams, broadening understanding of the full software development lifecycle and AI integration.

• Entrepreneurial Environment: Thrive in a fast-paced growth environment with ambitious goals, offering opportunities for significant impact and responsibility that can accelerate career progression.

📝 Enhancement Note: The growth path for this role is primarily focused on deepening technical expertise and leadership within the UX domain, rather than traditional management. The "contractor arrangement" might influence long-term career progression within the specific hiring company, but the skills acquired are highly transferable.

🌐 Work Environment

Office Type: The role is advertised as "Remote OK" and specifically for individuals based in the Netherlands. This indicates a remote-first or hybrid approach where employees can work from home or a co-working space.

Office Location(s): The specific office locations for the partner company are not provided, but the role is open to candidates based anywhere in the Netherlands.

Workspace Context:

• A distributed, globally distributed team structure requires strong asynchronous communication skills and self-discipline.

• The emphasis on collaboration suggests a need for effective virtual teamwork tools and practices.

• Access to modern development tools and cloud infrastructure is implied, given the technology stack.

• The environment fosters experimentation and continuous learning, encouraging a proactive approach to problem-solving.

Work Schedule: Approximately 40 hours per week. While remote, collaboration with a global team may require some flexibility in working hours to overlap with colleagues in different time zones. The role is based in the Netherlands, suggesting adherence to local labor laws and norms regarding working hours.

📝 Enhancement Note: The remote nature of the role necessitates strong self-management and communication skills. Candidates should be comfortable working independently and collaborating effectively through digital channels. The "B2B or contractor arrangement" is a key aspect of the work environment, meaning the candidate would be engaged as an independent contractor.

📄 Application & Portfolio Review Process

Interview Process:

• Initial Screening: Likely managed by Jobgether, focusing on core technical skills and alignment with the role's requirements through their AI-powered matching process.

• Technical Assessment: May involve coding challenges, system design discussions, or technical deep dives with the partner company's engineering team. Expect questions on JavaScript, TypeScript, React, backend development, and cloud technologies.

• Core UX Focus: Prepare to discuss your approach to user experience, product polish, and how you translate user needs into technical solutions. Case studies demonstrating your impact on UX are highly recommended.

• Behavioral & Cultural Fit: Interviews will assess ownership, initiative, resilience, communication, and collaboration skills, particularly in a distributed team context. Questions about experimentation and learning will be common.

• Final Rounds: May involve discussions with senior leadership or hiring managers to confirm fit and discuss project ownership.

Portfolio Review Tips:

• Showcase UX Impact: Clearly articulate how your contributions improved user experience, providing specific examples of features you enhanced and the measurable outcomes (e.g., increased engagement, reduced friction, improved task completion rates).

• Demonstrate Full-Stack Capability: Present projects that highlight your ability to work across the stack, from frontend UI development to backend API design and database management.

• Highlight System Design: Be ready to discuss the architecture of your projects, focusing on scalability, performance, and reliability, especially in cloud and serverless contexts.

• Quantify Achievements: Whenever possible, use metrics to demonstrate the impact of your work. For example, "reduced page load time by X%", "improved conversion rate by Y%", or "streamlined workflow Z, saving N hours per week."

• Focus on Ownership: Emphasize projects where you took end-to-end responsibility, demonstrating initiative and problem-solving skills.

Challenge Preparation:

• Coding Challenges: Practice JavaScript/TypeScript and potentially Python coding problems, focusing on data structures, algorithms, and clean code principles.

• System Design Challenges: Prepare for discussions on designing scalable web applications, APIs, and distributed systems, considering factors like performance, availability, and security.

• UX Problem-Solving: Be ready to analyze a given UX problem and propose solutions, explaining your reasoning and trade-offs.

📝 Enhancement Note: The interview process will likely be rigorous, assessing both technical depth and the candidate's ability to contribute to a high-performing, user-centric team. The "AI-powered matching" by Jobgether suggests an initial objective filtering, followed by a more qualitative assessment by the partner company. A strong portfolio or demonstrable project experience is crucial.

🛠 Tools & Technology Stack

Primary Tools:

• Frontend: React, JavaScript, TypeScript.

• Backend: Serverless architectures (e.g., AWS Lambda), asynchronous workflows, cloud-based services.

• Databases: Relational databases, specifically PostgreSQL.

• Cloud Platform: AWS (EC2, Lambda).

• Programming Languages: JavaScript, TypeScript, Python, or equivalent object-oriented languages.

Analytics & Reporting:

• Tools for measuring experimentation outcomes and iterating on solutions.

• Potentially integrated analytics platforms for tracking user behavior and product performance. CRM & Automation:

• Not explicitly mentioned, but a strong understanding of how engineering work impacts broader business systems (CRM, sales, marketing) is beneficial.

📝 Enhancement Note: The technology stack is modern and cloud-native. Proficiency in React, JavaScript/TypeScript, Python, AWS serverless services, and PostgreSQL are core requirements. Experience with asynchronous programming and system design for scalability is also critical.

👥 Team Culture & Values

Operations Values:

• High Standards: Commitment to producing high-quality, polished software.

• Customer Impact: Focus on delivering tangible value and improving the user experience.

• Transparency: Open communication about progress, blockers, and decisions.

• Accountability: Taking ownership of tasks and driving them to completion.

• Continuous Experimentation: Willingness to try new approaches, measure results, and learn from outcomes.

• Technical Excellence: Valuing robust engineering practices, system design, and efficient problem-solving.

Collaboration Style:

• Distributed & Cross-functional: Working effectively with engineers globally across different disciplines (full-stack, data, ML, DevOps).

• Proactive Communication: Surfacing blockers, asking thoughtful questions, and keeping stakeholders informed.

• Ownership-driven: Team members are expected to take initiative and drive projects forward with minimal supervision.

• Feedback-Oriented: Implicitly, an environment that values continuous improvement would encourage constructive feedback exchange.

📝 Enhancement Note: The team culture is geared towards high achievers who are autonomous, collaborative, and driven by impact and technical excellence. The emphasis on experimentation and continuous learning is a hallmark of modern, agile development teams.

⚡ Challenges & Growth Opportunities

Challenges:

• Balancing Polish and Pace: Delivering a highly polished UX in a fast-paced growth environment requires efficient workflows and strong prioritization skills.

• Distributed Collaboration: Effectively communicating and collaborating across different time zones and cultures within a globally distributed team.

• Complex Technical Problems: Tackling challenging problems in a "complex, high-impact industry" with AI-powered solutions.

• End-to-End Ownership: Managing projects from conception to completion with minimal oversight demands strong self-discipline and project management capabilities.

Learning & Development Opportunities:

• Advanced UX/UI Development: Deepen expertise in creating sophisticated and intuitive user interfaces with modern frameworks like React.

• Cloud & Serverless Architecture: Gain hands-on experience with advanced cloud services and serverless technologies for building scalable applications.

• AI/ML Integration: Opportunities to work with generative AI and LLMs, contributing to cutting-edge technology development.

• System Design Mastery: Refine skills in designing robust, scalable, and resilient systems for critical business applications.

• Cross-disciplinary Learning: Exposure to data engineering, machine learning, and DevOps practices through close collaboration.

📝 Enhancement Note: The role offers significant opportunities for technical growth and impact within a dynamic environment. The challenges are inherent to senior-level roles in innovative tech companies, requiring adaptability and continuous learning.

💡 Interview Preparation

Strategy Questions:

• UX Enhancement: "Describe a time you significantly improved the user experience of a product. What was your approach, what challenges did you face, and what were the results?" (Focus on detailing your process, metrics, and the "polish" aspect).

• System Design for Scale: "How would you design a scalable backend service to handle asynchronous user requests for a feature like X?" (Be prepared to discuss trade-offs, technologies like AWS Lambda, and database choices like PostgreSQL).

• Ownership & Initiative: "Tell me about a project where you took end-to-end ownership. How did you manage it, and what was your key contribution?" (Highlight your ability to drive projects with minimal oversight).

• Experimentation & Learning: "Describe a technical experiment you conducted. How did you measure its success, and what did you learn from it?" (Showcase your data-driven approach and ability to iterate).

Company & Culture Questions:

• Team Collaboration: "How do you collaborate effectively with a distributed, cross-functional engineering team?" (Emphasize proactive communication and understanding of different disciplines).

• High Standards: "What does 'technical excellence' mean to you, and how do you ensure it in your work?" (Relate this to product polish and robust engineering).

• Company Vision: Research Jobgether and any available information about their partner companies to understand their mission and industry impact. "How does your approach to Core UX align with transforming a major global industry?"

Portfolio Presentation Strategy:

• Structure: Organize your portfolio by project, clearly stating the problem, your role, the technologies used, the challenges overcome, and the measurable impact (especially on UX and performance).

• Quantify: Use data and metrics extensively to demonstrate the success of your contributions.

• Showcase UX: Dedicate specific sections or examples to highlight your UX improvements, using visuals or descriptions to convey the user experience changes.

• Explain Your Process: Be ready to walk through your thought process for specific technical decisions, architectural choices, and problem-solving approaches.

📝 Enhancement Note: The interview process will likely probe your technical depth, problem-solving abilities, and your alignment with the company's values of ownership, experimentation, and customer impact. A strong portfolio that demonstrates tangible results, particularly in UX enhancement, will be critical.

📌 Application Steps

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

• Submit your application through the provided Jobgether link.

• Tailor your Resume: Highlight your 5+ years of software engineering experience, focusing on full-stack development, React, cloud technologies (AWS), serverless, and PostgreSQL. Emphasize any experience related to UX improvement, product polish, and system design.

• Prepare Your Portfolio: If you have a GitHub profile, personal website, or specific project documentation, ensure it showcases your full-stack capabilities, UX contributions, and quantifiable achievements. Be ready to discuss specific projects in detail.

• Practice Interview Questions: Review common technical interview questions for full-stack roles, system design, and behavioral questions related to ownership, collaboration, and experimentation. Prepare to articulate your thought process clearly.

• Research Jobgether: Understand Jobgether's AI-powered matching process and their role as an intermediary. Familiarize yourself with the company's mission and values to articulate your cultural fit.

⚠️ 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. The role is a contractor position with no visa sponsorship.