Senior Full Stack Engineer - Core UX

📍 Job Overview

Job Title: Senior Full Stack Engineer - Core UX

Company: Jobgether (Partner Company)

Location: United Kingdom

Job Type: Full-time / Contractor

Category: Engineering / Software Development

Date Posted: September 04, 2026

Experience Level: 5-10 Years

Remote Status: Fully Remote

🚀 Role Summary

• Drive the refinement and enhancement of core product user experiences, focusing on usability, consistency, responsiveness, performance, and visual quality.

• Design, develop, and maintain scalable full-stack solutions that integrate modern frontend frameworks with robust backend services.

• Collaborate within a global, high-performing engineering team, contributing to sophisticated software and AI-powered solutions.

• Take end-to-end ownership of projects, from problem definition through to implementation and completion, with a strong emphasis on individual impact and technical craftsmanship.

• Experiment with new approaches, measure outcomes, and iterate rapidly to solve complex technical and product challenges in a fast-paced growth environment.

📝 Enhancement Note: While the provided data describes a "Senior Full Stack Engineer - Core UX," the core responsibilities and requirements lean heavily into software engineering with a specialized focus on user experience and product polish. For the purpose of this enhancement, the role is categorized under Engineering/Software Development, acknowledging the significant UX component. The "Full-time / Contractor" employment type suggests flexibility in how the role is structured, potentially via a B2B or contractor arrangement as mentioned in the requirements.

📈 Primary Responsibilities

• Lead the enhancement of existing product functionalities, with a meticulous focus on user interface (UI) polish, interaction design, and overall product experience optimization.

• Develop and implement scalable full-stack solutions, encompassing both client-side and server-side components, to meet evolving product requirements and technical standards.

• Contribute significantly to frontend development, leveraging modern JavaScript frameworks and libraries, with a preference for React expertise.

• Build and maintain robust backend services, including serverless architectures, asynchronous workflows, and cloud-native applications, ensuring reliability and scalability.

• Design and manage data solutions, working with relational databases to support application functionality and ensure data integrity.

• Engage in proactive, end-to-end project ownership, driving initiatives from conception to delivery with minimal supervision and a high degree of autonomy.

• Foster a collaborative environment within a globally distributed team, effectively communicating progress, identifying blockers, and contributing to shared technical goals.

• Champion a culture of continuous experimentation, data-driven decision-making, and rapid iteration to solve challenging technical and product issues.

• Ensure adherence to high standards of craftsmanship, code quality, and system architecture, contributing to the overall technical excellence of the engineering team.

• Proactively identify and address performance bottlenecks and usability issues to deliver a consistently responsive and intuitive user experience.

📝 Enhancement Note: The primary responsibilities have been elaborated to reflect the "Core UX" aspect of the title, emphasizing the direct impact on user interaction and product polish. The responsibilities also highlight the full-stack nature of the role and the expectation of end-to-end ownership, which are critical for senior-level positions in fast-paced environments.

🎓 Skills & Qualifications

Education: No specific educational requirements are listed, indicating that practical experience and demonstrated skill proficiency are prioritized.

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

Required Skills:

• Frontend Frameworks: Professional experience with a modern frontend framework, with React being particularly valuable.

• Programming Languages: Strong knowledge of JavaScript, TypeScript, and/or Python. Equivalent experience in other object-oriented programming languages will be considered.

• Cloud & Serverless: Experience with serverless technologies and cloud environments, such as AWS Lambda and EC2.

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

• Databases: Solid experience with relational databases, with a preference for PostgreSQL.

• Software Engineering Fundamentals: Strong understanding of system design, debugging, architecture, and structured problem-solving methodologies.

• User Experience Focus: Keen attention to detail and a genuine appreciation for high-quality, polished user experiences.

• Ownership & Initiative: Demonstrated ability to take ownership, show initiative, exhibit resilience, and drive projects forward with limited supervision.

• Communication & Collaboration: Excellent communication skills and a proactive approach to collaboration within a distributed, cross-functional environment.

• Adaptability & Learning: Comfort with experimentation, measuring outcomes, learning quickly, and iterating on challenging problems.

• Work Authorization: Authorization to work in the European country where you are based (for contractor arrangement).

Preferred Skills:

• Experience with Large Language Models (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 skills section has been structured to clearly delineate required and preferred qualifications. Specific technologies mentioned in the job description (React, JavaScript, TypeScript, Python, AWS Lambda, EC2, PostgreSQL) are highlighted. The emphasis on "Core UX" is reflected in the required "User Experience Focus" skill. The preference for React is explicitly noted.

📊 Process & Systems Portfolio Requirements

Portfolio Essentials:

• UX Enhancement Case Studies: Showcase examples of how you've refined existing product features to improve usability, responsiveness, performance, and overall user experience. Quantify the impact where possible (e.g., reduction in load times, improvement in user satisfaction metrics).

• Full-Stack Project Demonstrations: Present projects that clearly demonstrate your ability to build end-to-end solutions, highlighting both frontend polish and backend scalability.

• System Design Artifacts: Include diagrams or documentation that illustrate your approach to system design, architecture, and scalability for complex applications.

• Problem-Solving Examples: Provide examples of how you've tackled complex technical or product challenges, detailing your approach, the tools used, and the iterative process undertaken.

Process Documentation:

• Workflow Design & Optimization: Demonstrate experience in designing efficient workflows and optimizing existing processes, particularly within a full-stack development context.

• Implementation & Automation: Showcase projects where you've implemented new features or automated processes, emphasizing scalability and maintainability.

• Measurement & Performance Analysis: Examples of how you've measured the impact of your work, analyzed performance metrics, and used data to drive further improvements.

📝 Enhancement Note: This section is crucial for a Senior Full Stack Engineer role with a UX focus. The portfolio requirements are tailored to showcase not just coding ability but also the strategic thinking, problem-solving skills, and user-centric approach expected. Emphasis is placed on demonstrating tangible improvements and end-to-end ownership.

💵 Compensation & Benefits

Salary Range: $80,000 - $165,000 USD per year.

Note on Salary: This range is provided in USD and is stated to vary based on experience, performance, and geographic location. For candidates based in the UK, local market rates and cost of living should be considered, though the company has provided a USD benchmark.

Benefits:

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

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

• Professional Development:

  • Global team offsites and opportunities to connect with colleagues internationally.
  • Phone reimbursement.
  • Gym reimbursement.
  • Student stipend, supporting continuous learning and skill development.

• Professional Environment:

  • 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: While not explicitly stated as fixed, the role implies a standard full-time commitment (40 hours/week) given the context of a senior engineering role and the benefits offered. Flexibility is likely, given the remote nature.

📝 Enhancement Note: The salary range is directly from the input. The benefits have been categorized for clarity, highlighting professional development and the positive work environment. The note on currency and regional variation is important for candidates in the UK. The working hours are inferred from typical full-time expectations for this level of role.

🎯 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 or enterprise-level focus, likely in a sector that requires robust, data-intensive applications, possibly FinTech, HealthTech, or a specialized enterprise software domain. The mention of AI and LLMs points towards a company at the forefront of technological innovation.

Company Size: The description emphasizes a "small, high-performing team" and "significant individual impact," suggesting a lean, agile organization, possibly a scale-up or a focused R&D division within a larger entity.

Founded: No founding date is provided. The emphasis on AI and sophisticated solutions suggests a relatively modern company or a division that has recently pivoted towards these technologies.

Team Structure:

• Core UX Team: You will be part of the Core UX team, responsible for refining product experiences and ensuring consistency, responsiveness, intuition, and polish.

• Cross-Functional Collaboration: You will work closely with full-stack, data, machine learning, and DevOps engineers, indicating a highly collaborative and integrated engineering structure.

• Global Distribution: The team is globally distributed, requiring strong remote collaboration skills and asynchronous communication practices.

Methodology:

• Agile & Iterative: The emphasis on "experiment continuously," "measure results," and "iterate rapidly" points towards agile development methodologies with a strong focus on continuous improvement.

• Data-Driven: "Measure results" and "measurable customer impact" highlight a data-driven approach to product development and decision-making.

• Customer-Centric: The focus on "user experiences," "usability," and "intuition" underscores a commitment to understanding and meeting customer needs.

• Technical Excellence: The culture is centered on "high standards," "craftsmanship," and "technical excellence," indicating a dedication to quality and robust engineering practices.

Company Website: https://jobgether.com/

📝 Enhancement Note: The company culture is inferred from the job description's emphasis on craftsmanship, continuous learning, experimentation, and customer impact. The "complex, high-impact industry" and AI focus suggest a technologically advanced and potentially disruptive company. The team structure highlights cross-functional collaboration within a global, remote setting.

📈 Career & Growth Analysis

Operations Career Level: This is a Senior Full Stack Engineer role, implying a high level of technical expertise, autonomy, and the ability to mentor or guide less experienced engineers. The focus on "Core UX" means this role is critical in shaping the user-facing aspects of the product.

Reporting Structure: While not explicitly stated, senior engineers typically report to an Engineering Manager, Tech Lead, or Director of Engineering. Within the Core UX team, there might be a dedicated lead overseeing its specific objectives.

Operations Impact: The role's direct impact is on the user experience of the product. By refining existing functionality and ensuring consistency, responsiveness, and polish, this role directly influences user satisfaction, adoption rates, and potentially conversion metrics. The work also contributes to the overall scalability and reliability of the platform, which is foundational for business growth.

Growth Opportunities:

• Technical Specialization: Deepen expertise in frontend frameworks (React), backend technologies, serverless architectures, or AI/ML integrations.

• Leadership Development: Opportunity to take on technical leadership roles, mentor junior engineers, and influence architectural decisions within the Core UX team and beyond.

• Cross-Functional Learning: Gain exposure to Data, Machine Learning, and DevOps practices through close collaboration, broadening technical understanding.

• Product Ownership: Expand scope of ownership and influence over product direction and technical strategy in a fast-paced growth environment.

• Industry Impact: Contribute to transformative projects in a "complex, high-impact industry" using cutting-edge AI and software solutions.

📝 Enhancement Note: The career and growth analysis focuses on the progression path for a senior engineer within a technology-focused company. The emphasis is on deepening technical skills, developing leadership capabilities, and understanding the impact of the role on both the product and the broader business objectives.

🌐 Work Environment

Office Type: This is a fully remote position.

Office Location(s): The role is based in the United Kingdom, but the work is performed remotely. The company operates globally.

Workspace Context:

• Remote-First Culture: The environment is geared towards supporting remote employees, emphasizing asynchronous communication, digital collaboration tools, and flexibility.

• Collaborative Digital Space: Expect a highly digital workspace with extensive use of communication platforms (e.g., Slack, Teams), project management tools (e.g., Jira, Asana), and code repositories (e.g., GitHub, GitLab).

• Access to Tools: The role requires proficiency with modern development tools and access to cloud-based services, likely provided or supported by the company.

• Global Team Interaction: Opportunities to interact with a diverse, international team of engineers, fostering a broad perspective and cross-cultural collaboration.

Work Schedule: The role is fully remote, offering flexibility in working hours. However, as part of a global team, there will be a need to coordinate with colleagues in different time zones, potentially requiring some overlap during core working hours for meetings and synchronous collaboration. A standard full-time commitment is expected.

📝 Enhancement Note: The work environment is characterized by its fully remote nature and the global distribution of the team. The emphasis is on digital collaboration, asynchronous communication, and the flexibility that comes with a remote setup, balanced with the need for cross-timezone coordination.

📄 Application & Portfolio Review Process

Interview Process:

• AI-Powered Screening: Initial application review is managed by Jobgether's AI, ensuring objective matching against core requirements.

• Company Shortlisting: Top candidates identified by AI are shortlisted and shared directly with the partner hiring company.

• Hiring Company Management: The partner company manages all subsequent steps, including interviews, assessments, and final decisions.

• Typical Senior Engineering Interviews: Expect technical interviews focused on system design, coding challenges (potentially live coding or take-home assignments), behavioral questions assessing ownership, collaboration, and problem-solving, and discussions about past projects and UX impact.

• Portfolio Review: Your portfolio will be a critical component, especially for demonstrating your "Core UX" contributions and full-stack capabilities.

Portfolio Review Tips:

• Quantify UX Impact: For each project, clearly articulate the specific UX improvements made and, if possible, provide metrics demonstrating their positive impact (e.g., user feedback, conversion rates, task completion times, performance benchmarks).

• Showcase Full-Stack Integration: Present projects that clearly illustrate your end-to-end development skills, from UI implementation to backend logic and data management.

• Highlight Ownership: For projects where you took significant ownership, clearly define your role, responsibilities, and the challenges you overcame independently.

• Demonstrate Iterative Process: Explain how you experimented, gathered feedback, and iterated on designs or features to achieve optimal results.

• Technical Depth: Be prepared to discuss the architectural decisions, technology choices, and trade-offs made during development.

Challenge Preparation:

• System Design: Prepare to discuss designing scalable, performant, and maintainable systems. Focus on trade-offs and justifications for your design choices.

• Coding Proficiency: Practice coding challenges that involve complex logic, data structures, and algorithms, with an eye towards writing clean, efficient, and well-tested code.

• UX Problem Solving: Be ready to tackle hypothetical UX problems, outlining your thought process for analysis, ideation, and solution design, considering both user needs and technical constraints.

• Behavioral Questions: Prepare examples that demonstrate your ownership, resilience, collaboration, and ability to work effectively in a remote, fast-paced environment.

📝 Enhancement Note: The application process is unique due to Jobgether's AI screening. The advice for portfolio review and interview preparation is tailored to highlight the "Senior Full Stack Engineer - Core UX" aspects, emphasizing demonstrable impact, technical depth, and user-centric problem-solving.

🛠 Tools & Technology Stack

Primary Tools:

• Frontend: React (highly preferred), JavaScript, TypeScript. Other modern frontend frameworks may be acceptable if paired with strong JavaScript/TypeScript skills.

• Backend: Python (preferred), JavaScript, TypeScript. Experience with other object-oriented languages is a plus.

• Cloud Platforms: AWS (specifically AWS Lambda, EC2 mentioned). Experience with other major cloud providers (GCP, Azure) could be beneficial.

• Databases: PostgreSQL (preferred), other relational databases.

• Serverless Technologies: Familiarity and experience with serverless architectures are key.

• Asynchronous Workflows: Experience in designing and implementing systems that handle asynchronous tasks.

Analytics & Reporting:

• While specific tools aren't listed, a senior engineer would be expected to use various methods for performance monitoring, debugging, and potentially A/B testing to measure UX improvements. This could involve browser developer tools, cloud monitoring services, and custom logging. CRM & Automation:

• Not directly specified for this role, but understanding how frontend and backend systems integrate with potential CRM or business automation tools could be a plus, especially in understanding the broader business context.

📝 Enhancement Note: The technology stack is derived directly from the "Requirements" section, with emphasis placed on the preferred technologies (React, Python, PostgreSQL). The "Tools & Technology Stack" section is presented as a core requirement for a Senior Full Stack Engineer, highlighting the expected proficiencies.

👥 Team Culture & Values

Operations Values:

• High Standards & Craftsmanship: A strong emphasis on quality, attention to detail, and delivering polished, well-engineered solutions.

• Customer Impact: A core value is creating measurable positive impact for customers through excellent user experiences and robust functionality.

• Transparency & Accountability: Open communication, clear reporting of progress and blockers, and taking responsibility for outcomes.

• Continuous Experimentation & Learning: An environment that encourages trying new approaches, learning from results (both successes and failures), and iterating rapidly.

• Ownership: Taking initiative and driving projects to completion with a high degree of autonomy.

Collaboration Style:

• Global & Distributed: Collaboration occurs across different time zones and cultures, relying heavily on asynchronous communication and digital tools.

• Cross-Functional Integration: Close partnership with Data, Machine Learning, and DevOps engineers, requiring effective communication and understanding of different technical domains.

• Proactive Communication: Emphasis on proactive updates, surfacing blockers early, and asking thoughtful questions to ensure alignment and efficient progress.

• Mentorship & Guidance: As a senior role, there's an expectation to contribute to a positive team dynamic by sharing knowledge and potentially mentoring junior colleagues.

📝 Enhancement Note: The team culture and values are synthesized from various statements within the job description, focusing on what makes the company's engineering environment unique and what behaviors are expected from its senior engineers.

⚡ Challenges & Growth Opportunities

Challenges:

• Balancing UX Polish with Scalability: The core challenge is to deliver highly polished user experiences while ensuring the underlying full-stack architecture remains scalable, performant, and maintainable across a global platform.

• Remote Collaboration Complexity: Effectively collaborating and driving projects forward within a globally distributed team requires excellent communication and asynchronous work strategies.

• Rapid Iteration in a Fast-Paced Environment: Adapting to a dynamic environment where rapid experimentation and iteration are key can be demanding, requiring quick learning and decision-making.

• Integrating AI/ML Features: If the company is heavily invested in AI, integrating these complex technologies seamlessly into the user experience presents unique technical and design challenges.

Learning & Development Opportunities:

• Cutting-Edge Technology: Opportunity to work with advanced technologies like AI, LLMs, and modern cloud-native architectures.

• Deep UX Expertise: Develop specialized skills in crafting exceptional user experiences by working on a "Core UX" team.

• Technical Leadership: Grow into technical leadership roles by taking ownership, mentoring, and influencing architectural decisions.

• Industry Transformation: Contribute to significant advancements in a "complex, high-impact industry" through technological innovation.

• Cross-Disciplinary Knowledge: Gain exposure to data science, machine learning, and DevOps practices through close team collaboration.

📝 Enhancement Note: Challenges and growth opportunities are framed around the specific context of a Senior Full Stack Engineer focusing on Core UX within a technology-forward, remote, and globally distributed company.

💡 Interview Preparation

Strategy Questions:

• UX Improvement Strategy: "Describe a time you significantly improved a product's user experience. What was your approach, what metrics did you track, and what was the outcome?" (Prepare a case study focusing on your process, the specific UX enhancements, and quantifiable results.)

• Full-Stack Architecture Design: "How would you design a scalable backend service for real-time user updates, considering performance and reliability?" (Be ready to discuss system design principles, trade-offs, and relevant technologies like websockets, serverless functions, and databases.)

• Problem-Solving & Resilience: "Tell me about a complex technical challenge you faced in a remote environment. How did you overcome it, and what did you learn?" (Focus on demonstrating initiative, problem-solving skills, and adaptability.)

Company & Culture Questions:

• Craftsmanship & Quality: "What does 'craftsmanship' mean to you in software engineering, and how do you ensure it in your work?" (Relate this to your attention to detail and commitment to high-quality UX.)

• Experimentation & Learning: "How do you approach experimentation in your development process? Can you give an example of a time you learned something new that changed your approach?" (Highlight your comfort with iteration and data-driven decision-making.)

• Team Collaboration: "How do you contribute to a positive and productive culture within a globally distributed team?" (Emphasize your communication, transparency, and collaborative spirit.)

Portfolio Presentation Strategy:

• Focus on Impact: Start with the "why" and the impact you achieved, rather than just the technical details. Quantify results whenever possible.

• Structure Your Narrative: For each project, clearly explain the problem, your solution, the technologies used, your specific contributions, and the outcomes.

• Highlight UX Contributions: For the "Core UX" aspect, clearly articulate how you specifically improved the user experience, the design thinking involved, and the resulting user benefits.

• Showcase Full-Stack Integration: Ensure your portfolio pieces demonstrate your ability to build complete features or applications, not just isolated components.

• Be Ready for Deep Dives: Prepare to answer detailed technical questions about your projects, including architectural choices, trade-offs, and challenges encountered.

📝 Enhancement Note: Interview preparation advice is designed to help candidates anticipate questions related to the specific requirements of this Senior Full Stack Engineer role, with a strong emphasis on UX, full-stack development, remote collaboration, and the company's values.

📌 Application Steps

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

• Submit Your Application: Utilize the provided application link. Your initial application will be processed through Jobgether's AI matching system.

• Curate Your Portfolio: Prepare a portfolio that prominently features your best work, with a specific emphasis on UX enhancements, full-stack projects, and demonstrable impact. Quantify results and clearly articulate your role in each project.

• Tailor Your Resume: Optimize your resume to highlight your 5+ years of experience, proficiency in React, JavaScript, TypeScript, Python, AWS, and PostgreSQL, and any experience with AI/LLMs or distributed systems. Use keywords from the job description.

• Prepare for Technical & Behavioral Interviews: Anticipate questions on system design, coding, UX problem-solving, and behavioral aspects related to ownership, collaboration, and working in a remote, fast-paced environment. Practice articulating your thought process and project experiences clearly.

• Research the Company & Industry: Understand Jobgether's mission and the nature of the "complex, high-impact industry" they serve. Familiarize yourself with their focus on AI and sophisticated software solutions to demonstrate genuine interest and alignment.

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