Senior Full Stack Engineer - Core UX

📍 Job Overview

Job Title: Senior Full Stack Engineer - Core UX

Company: Jobgether (Partner Company)

Location: Germany

Job Type: Full-time, Contractor

Category: Software Engineering, Core UX

Date Posted: 2026-09-04

Experience Level: 5-10 Years

Remote Status: Remote OK (within Germany)

🚀 Role Summary

• Focus on refining and enhancing core product experiences with a strong emphasis on usability, consistency, responsiveness, performance, and visual quality.

• Drive the design, development, debugging, and maintenance of scalable full-stack solutions that directly support evolving product requirements.

• Collaborate extensively with a global, distributed team of full-stack, data, machine learning, and DevOps engineers to tackle complex challenges.

• Take end-to-end ownership of projects, from problem definition to implementation and completion, with a high degree of autonomy and minimal oversight.

• Contribute to a culture of high standards, customer impact, transparency, accountability, continuous experimentation, and technical excellence in a fast-paced growth environment.

📝 Enhancement Note: The role is listed by Jobgether but managed by a partner company. This means application and hiring processes are handled by the partner. The "Core UX" designation implies a deep focus on user interaction and interface polish, requiring a blend of frontend and backend skills to ensure a seamless and intuitive user experience. The "contractor" employment type suggests a potential for project-based work or a specific duration, though the salary range and benefits indicate a significant, full-time commitment.

📈 Primary Responsibilities

• Elevate existing product functionality by meticulously refining layouts, interactions, interface behavior, and overall product polish to ensure a premium user experience.

• Architect, develop, and implement scalable full-stack solutions, leveraging modern frontend frameworks (React preferred) and robust backend services.

• Design and maintain backend functionality, including serverless architectures, asynchronous workflows, and cloud-based services, with a focus on reliability and scalability.

• Contribute to the development and maintenance of reliable, scalable data solutions, working effectively with relational databases like PostgreSQL.

• Proactively communicate project progress, identify and surface blockers, ask targeted questions, and ensure all relevant stakeholders are kept informed.

• Drive continuous improvement through experimentation with new approaches, rigorous measurement of results, and rapid iteration to solve complex technical and product challenges.

📝 Enhancement Note: The core responsibilities emphasize a hands-on approach to both frontend polish and backend scalability. The expectation of "end-to-end ownership" and "minimal oversight" points towards a senior individual contributor role where strategic thinking and proactive problem-solving are paramount.

🎓 Skills & Qualifications

Education: Not explicitly specified, but a Bachelor's or Master's degree in Computer Science, Engineering, or a related field is typically expected for senior roles.

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

Required Skills:

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

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

• Proficient in JavaScript, TypeScript, and/or Python; equivalent experience in other object-oriented programming languages will be considered.

• Experience with serverless technologies and cloud environments (e.g., AWS Lambda, EC2).

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

• Solid experience with relational databases, ideally PostgreSQL.

• Exceptional attention to detail and a deep 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 experimentation, measuring outcomes, rapid learning, and iterating on challenging problems.

• Authorization to work in the European country where you are based. 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 strongly emphasize practical experience and a keen eye for user experience detail, rather than specific academic credentials. The preference for React and Python/JavaScript/TypeScript, coupled with cloud and database experience, forms the core technical stack. The "Authorization to work in the European country" clause is critical for candidates based in Germany.

📊 Process & Systems Portfolio Requirements

Portfolio Essentials:

• Demonstrations of end-to-end project ownership, showcasing initiative from problem identification to successful implementation.

• Case studies highlighting improvements made to existing product functionality, with a focus on usability, responsiveness, performance, and visual polish.

• Examples of scalable full-stack solutions, detailing frontend frameworks (especially React) and backend architectures (serverless, asynchronous workflows).

• Evidence of work with relational databases, ideally PostgreSQL, and contributions to reliable data solutions.

• Projects showcasing attention to detail and a commitment to high-quality, polished user experiences. Process Documentation:

• Documentation or descriptions of how you approach system design, architecture, and structured problem-solving.

• Examples of your process for experimenting, measuring results, and iterating on challenging technical and product problems.

• Workflow examples illustrating your collaboration style within distributed, cross-functional engineering teams.

• Evidence of how you ensure consistency, responsiveness, and performance in user-facing features.

📝 Enhancement Note: While no explicit portfolio is requested, the "Accountabilities" and "Requirements" sections strongly imply that candidates should be prepared to showcase their work through case studies or detailed project descriptions that highlight their impact on user experience, system scalability, and end-to-end ownership.

💵 Compensation & Benefits

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

Benefits:

• Significant equity options package.

• 20 days of paid time off per year.

• Global team offsites and international networking opportunities.

• Phone reimbursement.

• Gym reimbursement.

• Student stipend.

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

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

• Exposure to challenging technology and AI problems in a major global industry.

• Work environment emphasizing ownership, experimentation, transparency, continuous learning, and measurable customer impact.

Working Hours: Assumed to be standard full-time hours (e.g., 40 hours per week), with flexibility implied by the remote nature and the emphasis on results over strict adherence to a schedule.

📝 Enhancement Note: The salary range is provided in USD, which is a key consideration for candidates based in Germany. The actual salary will be adjusted based on local market rates and cost of living, as indicated by "geographic location." The benefits package is robust, offering both financial incentives (equity) and perks that support employee well-being and professional development.

🎯 Team & Company Context

🏢 Company Culture

Industry: The partner company operates in a "complex, high-impact industry" and builds "sophisticated software and AI-powered solutions." This suggests a B2B enterprise software or a specialized technology sector, likely involving significant data processing or complex operational workflows.

Company Size: Implied to be a growth-stage company, given the "fast-paced growth environment," "ambitious goals," and "small, high-performing team." This suggests a dynamic and potentially agile organizational structure.

Founded: Not specified, but the context points to a company that has established itself and is now scaling its engineering and product capabilities.

Team Structure:

• The Core UX team is a specialized group within a larger global engineering organization.

• Collaboration is cross-functional, involving full-stack, data, machine learning, and DevOps engineers.

• The team is described as "small" and "high-performing," suggesting a collaborative yet results-oriented environment. Methodology:

• Emphasis on a "data-driven approach," "continuous experimentation," and "measurable customer impact."

• Processes are likely agile, with rapid iteration and a focus on iterative development.

• Strong focus on "technical excellence" and "craftsmanship" in software development.

Company Website: Jobgether.com (for general information about their platform), but the specific partner company's website is not provided.

📝 Enhancement Note: The culture described is one that values autonomy, technical rigor, and user-centricity. The "AI-powered matching process" by Jobgether suggests a data-driven approach to recruitment itself. The partner company likely fosters an environment where engineers can make significant contributions and have a direct impact.

📈 Career & Growth Analysis

Operations Career Level: Senior Full Stack Engineer - Core UX. This role is a senior individual contributor position, focused on deep technical expertise within the user experience domain. It requires not only strong coding skills but also the ability to influence product direction through technical recommendations and execution.

Reporting Structure: While not explicitly stated, a Senior Engineer typically reports to an Engineering Manager or a Lead Engineer within their specialized team (Core UX). They would then collaborate with other engineering disciplines.

Operations Impact: The role's impact is directly tied to the user experience and performance of the core product. By refining the UX, this role influences user adoption, satisfaction, and potentially conversion rates, indirectly impacting revenue and business growth.

Growth Opportunities:

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

• Leadership Potential: Transition into a Tech Lead role, mentoring junior engineers, driving technical strategy for the UX team, or leading specific feature initiatives.

• Cross-functional Development: Gain broader experience in data engineering, machine learning, or DevOps through close collaboration.

• Product Influence: Contribute to product strategy discussions based on technical feasibility and user experience best practices.

📝 Enhancement Note: This is a senior individual contributor role with significant potential for technical leadership and specialization. The emphasis on "ownership" and "driving projects forward" suggests a clear path for growth for engineers who excel in their domain and demonstrate leadership qualities.

🌐 Work Environment

Office Type: The role is described as "Remote OK" within Germany, and the "contractor" arrangement might imply a fully remote setup. However, global team offsites suggest opportunities for in-person collaboration.

Office Location(s): Germany. Specific city or office location is not provided, indicating flexibility for remote work within the country.

Workspace Context:

• A globally distributed team environment requiring strong asynchronous communication skills.

• Access to modern development tools and cloud infrastructure is implied.

• Collaborative workspace for brainstorming and problem-solving, both virtually and potentially during offsites.

• The focus is on creating a "highly polished" and "responsive" user experience, which translates to a need for efficient development and testing environments.

Work Schedule: While a standard 40-hour work week is assumed, the remote and contractor nature may offer some flexibility. The emphasis is on delivering results and meeting project milestones rather than strict adherence to office hours.

📝 Enhancement Note: The work environment is primarily remote, demanding strong self-discipline and communication skills. The global nature of the team and the potential for offsites offer a blend of independent work and collaborative engagement.

📄 Application & Portfolio Review Process

Interview Process:

• Initial Screening (Jobgether): AI-powered matching process to assess core requirements. Shortlisted candidates are passed to the partner company.

• Partner Company Screening: Likely includes technical assessments and interviews with the hiring manager and/or engineering leads.

• Technical Interviews: Focus on system design, coding challenges (potentially involving React, JavaScript/TypeScript, and backend logic), and debugging scenarios. Expect questions related to asynchronous workflows and database interactions.

• Core UX Deep Dive: Discussions about your approach to user experience, polish, responsiveness, and how you translate user needs into technical solutions.

• Behavioral Interviews: Assessment of ownership, initiative, resilience, communication, and collaboration skills, particularly in a distributed team.

• Final Rounds: May involve a higher-level technical discussion or a presentation of past work/portfolio.

Portfolio Review Tips:

• Showcase UX Impact: Prepare 2-3 detailed case studies focusing on projects where you significantly improved user experience, responsiveness, or performance. Quantify impact where possible (e.g., "reduced load times by X%", "improved user task completion rate by Y%").

• Highlight Full-Stack Capabilities: Clearly articulate your role in both frontend (React, UI/UX implementation) and backend (serverless, APIs, databases) development for each project.

• Demonstrate Ownership: For each case study, explain the problem, your proposed solution, your specific contributions, and the outcome. Emphasize how you drove the project forward with minimal supervision.

• Technical Depth: Be ready to discuss system design choices, architecture decisions, asynchronous patterns, and database schema design.

• Problem-Solving Examples: Prepare to walk through challenging technical problems you've encountered and how you solved them, especially those related to performance, scalability, or complex user interactions.

Challenge Preparation:

• Coding Challenges: Practice algorithm and data structure problems, as well as practical coding tasks related to React component development, API integration, and basic backend logic.

• System Design: Be prepared to discuss how you would design a scalable system, considering factors like performance, availability, and data consistency. Focus on areas relevant to UX and full-stack development.

• UX/UI Problem Solving: You might be given a scenario and asked to propose solutions for improving a specific user flow or interface element.

📝 Enhancement Note: The application process involves an AI screening followed by a partner company's process. Candidates should prepare a portfolio (even if informal) that demonstrates their full-stack skills with a strong UX focus, emphasizing ownership and measurable impact.

🛠 Tools & Technology Stack

Primary Tools:

• Frontend: React (highly preferred), JavaScript, TypeScript.

• Backend: Serverless architectures (e.g., AWS Lambda), asynchronous workflows, potentially Node.js or Python for backend services.

• Databases: Relational databases, specifically PostgreSQL.

• Cloud Platforms: AWS (EC2, Lambda).

• Development Practices: Git for version control, CI/CD pipelines (implied for a modern tech company).

Analytics & Reporting:

• Tools for measuring performance and user behavior (e.g., browser developer tools, potentially analytics platforms like Amplitude, Mixpanel, or custom logging).

• Dashboarding tools for monitoring system health and performance (specifics not mentioned, but expected for a senior role).

CRM & Automation: Not directly mentioned, but understanding how core UX impacts user engagement with CRM or other business systems could be relevant.

📝 Enhancement Note: The technology stack is modern and cloud-native, with a strong emphasis on React for the frontend and serverless/cloud for the backend. Proficiency in JavaScript/TypeScript, Python, and PostgreSQL is key. Familiarity with AWS services is a significant advantage.

👥 Team Culture & Values

Operations Values:

• Customer Impact: A primary driver for all work, focusing on delivering exceptional user experiences.

• Technical Excellence: Commitment to high standards in code quality, system design, and product polish.

• Ownership & Accountability: Taking full responsibility for projects and their outcomes.

• Experimentation & Learning: A culture that encourages trying new things, measuring results, and iterating quickly.

• Transparency & Collaboration: Open communication and teamwork within a distributed, cross-functional environment.

• Efficiency: Building scalable and performant solutions.

Collaboration Style:

• Highly collaborative, involving close work with diverse engineering disciplines (full-stack, data, ML, DevOps).

• Emphasis on asynchronous communication and proactive information sharing due to the distributed nature of the team.

• Encouragement of constructive feedback and iterative refinement.

📝 Enhancement Note: The culture aligns with typical high-growth tech environments, prioritizing impact, technical skill, and a proactive, learning-oriented mindset. The "Core UX" focus means that collaboration will be heavily geared towards ensuring a cohesive and intuitive user journey across all product touchpoints.

⚡ Challenges & Growth Opportunities

Challenges:

• Balancing Polish with Speed: Delivering a highly polished UX while maintaining rapid iteration cycles in a fast-paced environment.

• Cross-functional Dependencies: Effectively collaborating with data, ML, and DevOps teams to integrate complex features and ensure end-to-end system health.

• Remote Collaboration: Maintaining strong communication and team cohesion in a fully distributed setting.

• Technical Debt Management: Balancing new feature development with the need to refine and maintain existing product functionality.

• Evolving AI Landscape: Integrating new AI/ML capabilities into the user experience seamlessly and effectively.

Learning & Development Opportunities:

• Advanced Frontend/Backend Skills: Deepening expertise in React, modern JavaScript/TypeScript, serverless architectures, and cloud-native development.

• AI/ML Integration: Gaining practical experience with LLMs and generative AI in a product context.

• System Design & Architecture: Contributing to the design of scalable, resilient systems for a complex industry.

• Cross-functional Knowledge: Understanding the intricacies of data pipelines, machine learning models, and DevOps practices.

• Leadership Skills: Developing mentorship and technical leadership capabilities within a high-performing team.

📝 Enhancement Note: The role offers significant opportunities to tackle cutting-edge technology and shape user experiences in a critical industry. Challenges are inherent to a growth-stage tech company and require adaptability and strong problem-solving skills.

💡 Interview Preparation

Strategy Questions:

• "Describe a time you significantly improved the user experience of a product. What were the key changes, and how did you measure success?" (Focus on polish, responsiveness, usability).

• "Walk me through the architecture of a complex full-stack feature you built. What were the trade-offs, and how did you ensure scalability and performance?" (Emphasize system design, async workflows, databases).

• "How do you approach balancing the need for rapid iteration with maintaining a high standard of code quality and user experience polish?" (Discuss experimentation, iteration, and craftsmanship). Company & Culture Questions:

• "What interests you about working on 'Core UX' for a complex industry?" (Showcase understanding of the role's impact).

• "How do you contribute to a culture of experimentation and continuous learning in a remote team?" (Highlight proactivity, communication).

• "Describe your experience working in a small, high-performing team with significant autonomy." (Demonstrate ownership, resilience). Portfolio Presentation Strategy:

• Structure: For each case study, clearly outline: Problem -> Your Role/Solution -> Implementation Details (Tech Stack) -> Outcome/Impact (Quantified).

• Focus: Emphasize the "Core UX" aspects – how your work directly improved the user's interaction, performance, or visual appeal.

• Technical Depth: Be prepared to dive into the technical details of your implementations, especially regarding React, backend services, and database interactions.

• Ownership Narrative: Clearly articulate your end-to-end involvement and how you drove the project to completion.

📝 Enhancement Note: Interview preparation should focus on demonstrating a blend of strong technical skills, a deep understanding of user experience, and the soft skills required for a senior, autonomous role in a remote, collaborative environment.

📌 Application Steps

To apply for this operations position:

• Submit your application through the application link provided.

• Tailor Your Resume: Highlight 5+ years of relevant software engineering experience, specifically mentioning accomplishments related to improving product functionality, user experience, performance, and responsiveness. Use keywords like React, JavaScript, TypeScript, Python, PostgreSQL, AWS Lambda, EC2, serverless, system design, and asynchronous workflows.

• Prepare Your Portfolio: Gather 2-3 detailed examples of projects where you demonstrated end-to-end ownership, significantly improved user experience, and built scalable full-stack solutions. Be ready to present these with a focus on your specific contributions and measurable outcomes.

• Research the Partner Company: While information is limited, try to infer the industry and type of software they build from the job description. Understand the challenges of working in a "complex, high-impact industry."

• Practice Interview Questions: Rehearse answers to technical, behavioral, and situational questions, focusing on demonstrating your problem-solving skills, UX sensibility, and collaborative approach in a remote setting.

⚠️ 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.