Pasito - Fullstack engineer UI

📍 Job Overview

Job Title: Fullstack Engineer UI

Company: Silver.dev (Pasito)

Location: Buenos Aires, Argentina (Remote)

Job Type: FULL_TIME

Category: Software Engineering (UI/Fullstack Focus)

Date Posted: June 25, 2026

Experience Level: Mid-Level (2-5 Years)

Remote Status: Remote Solely (Argentina, Uruguay, United States)

🚀 Role Summary

• Design and build sophisticated, state-rich user interfaces for an AI-native employee benefits workspace, focusing on rich editing and collaboration experiences.

• Integrate AI and LLM-powered workflows directly into the user interface, enhancing data-dense and collaborative environments.

• Collaborate closely with Product, Design, Sales, and Client teams to understand customer workflows and translate them into robust, scalable product solutions.

• Act as a foundational member of the engineering team, influencing UI architecture, setting quality standards, and delivering mission-critical features for enterprise clients.

• Operate across the full stack, with a primary emphasis on frontend development and user-facing systems, to deliver end-to-end product experiences.

📝 Enhancement Note: While the title is "Fullstack Engineer UI," the description heavily emphasizes a "UI-first, product-driven engineer" with "strength in building sophisticated, state-rich user interfaces." This suggests a role that leans heavily into frontend development, but requires fullstack capabilities to deliver features end-to-end. The target audience is therefore operations professionals with strong UI/UX sensibilities and the ability to contribute across the stack.

📈 Primary Responsibilities

• Develop and own complex, state-rich UI systems: Design, implement, and maintain rich editing and collaboration functionalities using ProseMirror/Tiptap and Yjs, prioritizing correctness, performance, and an exceptional user experience.

• Integrate AI-native product experiences: Embed AI and LLM-powered features (e.g., AI agents for data extraction) directly within the UI, particularly in rich-text, data-intensive, and collaborative contexts.

• Drive cross-functional collaboration: Engage actively with Product Management, Design, Sales, and Client Success teams to deeply understand user workflows and business requirements, translating these into effective and durable software solutions.

• Enhance and refine existing systems: Continuously iterate on UI patterns, challenge existing assumptions about user interaction, and contribute to defining and elevating the quality standards for the product as it scales.

• Contribute to full-stack development: Leverage fullstack capabilities as needed to deliver features end-to-end, ensuring seamless integration between frontend experiences and backend services.

📝 Enhancement Note: The responsibilities highlight a deep focus on user interface development and integration of advanced technologies like AI and real-time collaboration. The emphasis on ownership and cross-functional collaboration points towards a role that requires strong communication and strategic thinking, common in operations-adjacent engineering roles.

🎓 Skills & Qualifications

Education: While no specific degree is mandated, a Bachelor's degree in Computer Science, Engineering, or a related field, or equivalent practical experience, is generally expected for roles of this nature.

Experience: 3+ years of professional experience building complex, state-rich web applications, with a strong emphasis on frontend development and UI/UX.

Required Skills:

• UI Development Expertise: Proven ability to build sophisticated, state-rich user interfaces with a focus on interaction quality, performance, and intuitive user experiences.

• Rich Text Editor Proficiency: Deep expertise in developing with ProseMirror or Tiptap, understanding their architecture for complex text manipulation and editing.

• Real-time Collaboration: Experience building real-time collaboration features and local-first applications using Yjs or similar synchronization technologies.

• Modern Frontend Technologies: Strong command of TypeScript, modern JavaScript frameworks (e.g., Next.js), and associated state management patterns.

• Cross-functional Collaboration: Demonstrated ability to work effectively with Product Managers and Designers to translate requirements into tangible product solutions.

• Technical Judgment: Sound judgment in balancing innovation with system stability and prioritizing development efforts.

Preferred Skills:

• AI/LLM Integration: Hands-on experience integrating AI and LLM-powered workflows (e.g., leveraging APIs from ChatGPT or Claude) into user-facing products.

• Backend/Fullstack Capability: Comfort and experience operating across the full stack, including Node.js and API development, to deliver end-to-end features.

• Frontend Testing: Strong familiarity with frontend testing tools and best practices (e.g., Jest, React Testing Library, Cypress) to ensure code quality and reliability.

• UI Architecture: Experience in designing and implementing scalable and maintainable UI architectures.

📝 Enhancement Note: The required skills are highly specific to advanced frontend development and real-time collaboration, indicating a need for engineers who can handle complex UI challenges. The inclusion of AI/LLM integration points to the modern, data-driven nature of the product, relevant to operations professionals interested in the intersection of technology and business process.

📊 Process & Systems Portfolio Requirements

Portfolio Essentials:

• Demonstration of UI Complexity: Showcase projects that involve intricate UI states, rich editing capabilities, or complex data visualizations.

• Collaboration Features: Include examples of applications that handle real-time data synchronization or collaborative editing, highlighting the technical challenges overcome.

• AI Integration Examples: If available, present projects where AI/LLM functionalities were integrated into the user experience, demonstrating problem-solving in this domain.

• End-to-End Feature Delivery: Highlight projects where you took ownership from concept to deployment, demonstrating fullstack capabilities if applicable.

Process Documentation:

• Workflow Design & Optimization: Examples of how you've mapped out and improved user workflows within applications, focusing on efficiency and user satisfaction.

• System Implementation & Automation: Showcase instances where you've implemented new systems or automated processes to enhance development efficiency or product functionality.

• Performance Analysis & Measurement: Demonstrate how you've tracked and analyzed the performance of UI components or application features, and used data to drive improvements.

📝 Enhancement Note: For a UI-heavy fullstack role, a portfolio is crucial. It should not just list projects but demonstrate how complex UI systems were built, how real-time collaboration was implemented, and how AI was integrated. Case studies detailing the process, challenges, and outcomes are highly valued.

💵 Compensation & Benefits

Salary Range: $80,000 - $110,000 USD per year. This range is competitive for a mid-level Fullstack Engineer with specialized UI expertise, particularly in remote roles serving the US market, considering the cost of living in Argentina.

Benefits:

• Comprehensive Health Coverage: Medical, Dental, and Vision insurance.

• Retirement Planning: 401(k) with employer match.

• Work-Life Balance: Flexible Paid Time Off (PTO).

• Professional Development: Learning budget for continuous skill enhancement and industry knowledge acquisition.

• Ownership: Meaningful equity in a rapidly growing startup.

• Life Insurance: Provided for employee well-being.

Working Hours: 40 hours per week. The role is remote-first, allowing for flexibility within standard working hours, with an expectation of overlap for cross-functional collaboration.

📝 Enhancement Note: The provided salary range is a strong indicator for mid-level engineering talent in regions like Argentina, targeting the US market. The benefits package is robust, reflecting typical offerings for tech startups with a focus on employee well-being and long-term incentives like equity. The inclusion of a learning budget is particularly relevant for operations-minded engineers focused on continuous improvement.

🎯 Team & Company Context

🏢 Company Culture

Industry: Technology (specifically InsurTech/FinTech focused on Employee Benefits)

Company Size: Early-stage startup (likely <50 employees based on typical Y Combinator trajectory and growth phase). This size implies a dynamic, fast-paced environment where individual contributions have a significant impact.

Founded: Pasito is backed by Y Combinator and Core Innovation Capital, indicating a strong foundation and validation within the startup ecosystem. The company focuses on modernizing a legacy industry with AI.

Team Structure:

• Engineering Team: Early members, likely small and highly collaborative, with a flat hierarchy. Expect close interaction with founders and senior leadership.

• Cross-functional Collaboration: Strong emphasis on working with Product, Design, Sales, and Client teams, indicating a team that values direct customer feedback and business impact.

• Operations & Client Focus: The company's mission to serve carriers, brokers, and employers means the engineering team is deeply connected to operational realities and client needs.

Methodology:

• Agile Development: Likely employs agile methodologies with rapid iteration cycles, given the startup environment and focus on shipping fast.

• Data-Driven Decisions: Emphasis on AI and data implies a culture that values metrics, analysis, and evidence-based decision-making.

• User-Centric Design: "AI-native workspace" and focus on UX suggest a commitment to building intuitive and effective user experiences driven by user needs.

Company Website: https://pasito.ai/

📝 Enhancement Note: The company culture is characterized by a blend of innovation (AI, modern tech) and precision (legacy industry, regulated). For operations professionals, this means a company that values efficiency, accuracy, and a deep understanding of business processes. The early-stage nature suggests high autonomy and direct impact.

📈 Career & Growth Analysis

Operations Career Level: This role is for a mid-level engineer (2-5 years experience) with a specialized focus on UI development. It offers the opportunity to be an early, influential member of the engineering team, shaping the core product's user experience.

Reporting Structure: Likely reports directly to a Head of Engineering, CTO, or potentially a Founder, given the early stage of the company.

Operations Impact: The engineer will directly impact the usability and adoption of Pasito's AI workspace by carriers, brokers, and employers. Improving the efficiency and clarity of benefits management through intuitive UI and AI features has direct operational and financial implications for their clients.

Growth Opportunities:

• Technical Specialization: Deepen expertise in advanced UI frameworks (ProseMirror/Tiptap, Yjs), real-time systems, and AI/LLM integration.

• Architectural Influence: Play a key role in defining and evolving the UI architecture and frontend technology stack.

• Leadership Potential: As the company grows, opportunities to mentor junior engineers, lead feature development, or even transition into technical leadership roles.

• Product Strategy Input: Contribute significantly to product direction through close collaboration with Product and Design, influencing the "feel" and functionality of an AI-native workspace.

📝 Enhancement Note: The "UI-heavy, product-focused" nature of this role means career growth will be tied to mastering complex frontend technologies and understanding how they drive business value. For operations professionals, this presents a chance to influence product development that directly impacts business efficiency and client satisfaction in a regulated industry.

🌐 Work Environment

Office Type: Remote-first. This means there is no central physical office, or any physical office is optional and not the primary mode of work.

Office Location(s): Primarily targeting candidates in Argentina and Uruguay, with the ability to work remotely within the United States. This suggests a global team with a focus on specific time zones for effective collaboration.

Workspace Context:

• Collaborative Tools: Expect heavy reliance on collaboration tools like Slack, Zoom, and project management software (e.g., Ashby, Jira) to maintain team cohesion and workflow visibility.

• Technology Stack: Access to modern development tools and cloud infrastructure. The role requires proficiency in specific libraries like ProseMirror/Tiptap and Yjs, indicating a sophisticated tech environment.

• Team Interaction: Regular virtual stand-ups, team meetings, and design/product reviews are essential for maintaining alignment and fostering a sense of team.

Work Schedule: 40 hours per week, with flexibility inherent in a remote-first setup. However, effective collaboration likely requires significant overlap with US-based team members, particularly during core business hours.

📝 Enhancement Note: The remote-first nature and specific location requirements (Argentina, Uruguay, US) are key for operations professionals to understand. It implies a need for strong self-discipline, excellent communication skills, and the ability to manage asynchronous workflows while ensuring sufficient synchronous collaboration with the broader team.

📄 Application & Portfolio Review Process

Interview Process:

• Initial Screening: A "Silver screening Interview" likely assesses basic qualifications, cultural fit, and interest in the role and company.

• Technical Assessment: This involves a "Silver Technical Interview" which might include coding challenges, system design discussions, or deep dives into your experience with specific technologies (ProseMirror, Yjs, TypeScript).

• Client-Facing Interviews: Subsequent "Client Screening Interview," "Client Technical interview," and "Client Behavioral Interview" suggest the role has significant client interaction or that the engineering team is deeply integrated with client needs and success. This is where demonstrating an understanding of business impact and operational efficiency will be crucial.

Portfolio Review Tips:

• Highlight UI Complexity: Focus on showcasing projects with intricate state management, rich editing functionalities, or sophisticated interactive elements.

• Demonstrate Collaboration: Provide clear examples of how you've implemented real-time features or collaborative workflows, explaining the technical challenges and solutions.

• Showcase AI Integration: If applicable, present case studies of integrating AI/LLMs, detailing the problem statement, your approach, and the outcome.

• Explain Your Process: For each project, be ready to discuss your design process, technical decisions, and how you collaborated with product and design teams. Emphasize efficiency improvements or user experience enhancements.

• Quantify Impact: Whenever possible, use metrics to demonstrate the positive impact of your work (e.g., performance improvements, user satisfaction gains, reduction in manual processes for clients).

Challenge Preparation:

• Technical Depth: Be prepared for deep dives into frontend architecture, state management, and specific libraries like ProseMirror/Tiptap and Yjs.

• Problem-Solving: Expect scenarios that require you to design solutions for complex UI problems, potentially involving AI integration or real-time data synchronization.

• Business Acumen: Given the client-facing interviews, be ready to connect technical solutions to business needs and operational efficiencies for insurance carriers and brokers.

📝 Enhancement Note: The multi-stage interview process, including "Client" interviews, is a strong indicator that candidates will need to demonstrate not just technical prowess but also an understanding of the business context and how their work impacts client operations and efficiency. A well-curated portfolio that highlights process and impact is essential.

🛠 Tools & Technology Stack

Primary Tools:

• UI Editors: ProseMirror, Tiptap (deep expertise required).

• Collaboration Libraries: Yjs (experience is a significant plus).

• Frontend Framework: Next.js (or similar modern React framework).

• Language: TypeScript, JavaScript.

• Backend Runtime: Node.js.

Analytics & Reporting:

• Frontend Testing: Jest, React Testing Library, Cypress (or similar).

• Performance Monitoring: Tools for tracking frontend performance and identifying bottlenecks.

CRM & Automation:

• Project Management: Ashby (as the ATS, likely used internally for project tracking), potentially Jira or Asana.

• Communication: Slack, Zoom.

• Version Control: Git.

📝 Enhancement Note: The explicit mention of ProseMirror/Tiptap and Yjs indicates a highly specialized technical requirement. Professionals looking to leverage their skills in these areas, or those eager to learn them in a production environment, will find this role appealing. Understanding how these tools enable complex workflows is key.

👥 Team Culture & Values

Operations Values:

• Precision & Trust: In the insurance and benefits industry, accuracy and reliability are paramount. Expect a strong emphasis on building robust, error-free systems.

• Efficiency & Automation: The company's mission to modernize legacy systems with AI directly translates to a value placed on streamlining processes and automating manual workflows.

• Collaboration & Partnership: Building with clients means a culture of strong partnership, direct feedback loops, and cross-functional teamwork.

• Innovation & Speed: Backed by Y Combinator and shipping fast, the team values rapid iteration, embracing new technologies like AI, and a proactive approach to problem-solving.

Collaboration Style:

• Cross-functional Integration: Engineers work closely with Product and Design to ensure UI solutions align with user needs and business objectives.

• Open Communication: Expect frequent communication via Slack, scheduled meetings, and potentially pair programming to ensure knowledge sharing and alignment.

• Ownership & Autonomy: As an early team member, you'll have significant autonomy, requiring a proactive and self-directed approach to collaboration.

📝 Enhancement Note: The company's values directly mirror operational excellence: precision, efficiency, and collaboration. For operations professionals, this suggests a team environment where their understanding of process and efficiency can be highly valued and applied within an engineering context.

⚡ Challenges & Growth Opportunities

Challenges:

• Mastering Specialized Tech: Deeply learning and applying ProseMirror/Tiptap and Yjs to build complex, enterprise-grade features.

• Integrating AI into Legacy Systems: Bridging the gap between cutting-edge AI capabilities and the often-complex, regulated nature of the employee benefits industry.

• Scaling Early-Stage Product: Ensuring that UI architecture and development practices can scale effectively as the user base and feature set grow rapidly.

• Balancing Innovation with Stability: Navigating the need to innovate quickly while maintaining the high level of accuracy and trust required in the InsurTech space.

Learning & Development Opportunities:

• Advanced UI/Collaboration Skills: Becoming an expert in state-rich editors and real-time synchronization technologies.

• AI/LLM Application: Gaining hands-on experience integrating generative AI into practical business applications.

• Product Strategy Contribution: Influencing the direction and user experience of a core product in a growing startup.

• Industry Expertise: Developing a deep understanding of the employee benefits and InsurTech landscape.

📝 Enhancement Note: The challenges align well with opportunities for operations professionals to apply their problem-solving skills to technical challenges, particularly in areas of process optimization and system efficiency through advanced technology.

💡 Interview Preparation

Strategy Questions:

• UI Architecture & State Management: "Describe how you would architect a highly dynamic and state-rich UI editor for complex document editing. What state management strategies would you employ, and why?" (Focus on ProseMirror/Tiptap principles).

• Collaboration & Synchronization: "Walk me through the technical challenges of building a real-time collaborative editing feature. How would you ensure data consistency and handle conflicts using Yjs?" (Prepare a case study if possible).

• AI Integration Impact: "Imagine Pasito wants to use AI to automatically extract key terms from insurance plan documents. How would you design the UI to present this information to a user, and what considerations would you have for user trust and error handling?" (Focus on user experience and operational efficiency).

Company & Culture Questions:

• Industry Relevance: "Why are you interested in applying AI and modern engineering practices to the employee benefits and insurance industry, a sector often seen as traditional?" (Connect to your understanding of operational inefficiencies and Pasito's mission).

• Team Dynamics: "How do you typically collaborate with product managers and designers to bring a feature from concept to completion? Describe a time you had to navigate differing opinions."

• Product Vision: "Based on what you know about Pasito, what do you see as the biggest opportunity for UI to drive value for our clients (brokers, carriers)?"

Portfolio Presentation Strategy:

• Focus on Process: For each project, start with the problem statement or user need, detail your approach and technical decisions, and conclude with the outcome and impact.

• Demonstrate Technical Depth: Be prepared to dive deep into the specific technologies used, especially ProseMirror/Tiptap and Yjs, explaining why you made certain choices.

• Quantify Results: Highlight any quantifiable improvements – speed, efficiency gains, user satisfaction, reduction in manual work – that your UI solutions achieved.

• Connect to Pasito's Mission: Frame your examples in the context of Pasito's goals: modernizing benefits, leveraging AI, and serving enterprise clients with precision and efficiency.

📝 Enhancement Note: The "Client" interviews suggest a need to demonstrate business acumen and an understanding of how technology solves operational problems for clients in the insurance/benefits sector. Your portfolio and interview answers should bridge the gap between technical execution and business value.

📌 Application Steps

To apply for this Fullstack Engineer UI position:

• Submit your application through the provided link on Ashby.

• Tailor your Resume: Highlight experience with TypeScript, modern frameworks (Next.js), and specifically any work with ProseMirror, Tiptap, or Yjs. Emphasize projects involving complex UIs, real-time collaboration, or AI integration.

• Prepare Your Portfolio: Curate a selection of projects that best showcase your UI development skills, attention to detail, and ability to handle complex state management and collaboration features. Be ready to walk through 1-2 key projects in detail, explaining your process, technical decisions, and the impact of your work.

• Research Pasito: Understand their mission, target market (brokers, carriers, employers), and the industry challenges they aim to solve. Consider how AI and advanced UI can improve operational efficiency in employee benefits administration.

• Practice Interview Questions: Prepare to discuss your experience with the required technologies and your approach to collaboration, problem-solving, and delivering user-centric features, especially in the context of a regulated industry.

⚠️ 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.

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