UI Engineer

📍 Job Overview

Job Title: UI Engineer

Company: OnCorps, LLC

Location: Boston, Massachusetts, United States

Job Type: Full-Time

Category: Engineering / Product Development

Date Posted: 2026-06-15

Experience Level: 5-10 years

Remote Status: Hybrid

🚀 Role Summary

• Architect, develop, and maintain highly responsive, accessible, and scalable user interfaces using modern web technologies.

• Partner directly with the design team to evolve and govern the company's design system, establishing best practices for component architecture and interaction design.

• Collaborate with backend engineers to integrate frontend applications with robust middleware and backend APIs, ensuring smooth data handling, state management, and application performance.

• Operate with a framework-agnostic mindset, applying deep expertise in core web fundamentals to build applications primarily utilizing React or Angular.

• Drive frontend innovation by exploring and adopting cutting-edge interaction models as the company defines its future agent framework.

📝 Enhancement Note: This role is positioned as a senior UI Engineer responsible for establishing foundational frontend architecture and a scalable design system. The emphasis on "Agentic AI" and "middle and back-office automation" within the financial industry suggests a need for robust, data-intensive, and highly reliable user interfaces. The requirement for a "framework-agnostic mindset" with primary use of React or Angular indicates a need for deep understanding of core web principles beyond specific framework syntax.

📈 Primary Responsibilities

• Design, develop, and maintain reusable, modular, and highly performant UI components that adhere to established design system standards.

• Translate complex design mockups and wireframes into high-quality, production-ready code, ensuring pixel-perfect implementation and responsiveness across various devices and screen sizes.

• Implement accessibility best practices (WCAG 2.1 AA) to ensure all users, including those with disabilities, can effectively interact with the application.

• Optimize applications for maximum speed, scalability, and robustness, employing techniques such as code splitting, lazy loading, and efficient state management.

• Actively participate in code reviews, providing constructive feedback to peers to maintain code quality, consistency, and adherence to architectural guidelines.

• Collaborate with product managers, designers, and backend engineers to define feature requirements, technical specifications, and project timelines.

• Troubleshoot and resolve complex frontend bugs and performance issues, performing root cause analysis and implementing effective solutions.

• Stay abreast of emerging frontend technologies and industry trends, evaluating their potential application to enhance the user experience and development process.

• Contribute to the development and documentation of frontend coding standards, best practices, and architectural patterns.

📝 Enhancement Note: The responsibilities are framed to highlight the senior nature of the role, emphasizing architectural contributions, design system governance, and cross-functional collaboration. The inclusion of accessibility and performance optimization underscores the need for a sophisticated understanding of modern frontend development principles, crucial for enterprise-level applications in regulated industries.

🎓 Skills & Qualifications

Education: A Bachelor's degree in Computer Science, Engineering, or a related technical field is preferred, or equivalent practical experience.

Experience: 5+ years of professional experience in frontend development, UI engineering, or a related role focused on building complex, scalable web applications.

Required Skills:

• Strong proficiency in core web technologies: JavaScript (ES6+), TypeScript, HTML5, and modern CSS/styling methodologies (e.g., CSS-in-JS, SASS/LESS).

• Deep understanding and hands-on experience with modern, component-driven frontend frameworks such as React or Angular. Demonstrated ability to adapt to and leverage the best tool for a given task.

• Proven track record of building, documenting, and maintaining robust design systems, ideally using tools like Storybook.js or similar component development environments.

• Solid experience working with middleware, integrating with RESTful and GraphQL APIs, and implementing effective client-side state management solutions (e.g., Redux, Zustand, NgRx, RxJS).

• Experience with asynchronous programming, data fetching, and handling complex data structures within the frontend.

• A product-focused mindset with a strong appreciation for UX/UI design principles, user-centered design processes, and the ability to advocate for user needs.

• Passion for staying ahead of the curve in frontend technology, with a keen interest in how AI and machine learning are shaping the future of user interfaces and application development. Preferred Skills:

• Prior exposure to middle- and/or back-office operations within the financial industry or fund administration.

• Experience with frontend performance optimization techniques and tools (e.g., Lighthouse, WebPageTest).

• Familiarity with build tools and module bundlers (e.g., Webpack, Vite, Rollup).

• Understanding of web security best practices relevant to frontend applications.

• Experience with automated testing frameworks for frontend applications (e.g., Jest, React Testing Library, Cypress).

• Familiarity with CI/CD pipelines and deployment strategies for frontend applications.

📝 Enhancement Note: The required skills are expanded to include specific examples of technologies and methodologies, such as different styling approaches, state management libraries, and API types. The preferred skills are tailored to enhance the candidate's suitability for an enterprise AI company, particularly in the financial sector, by adding relevance to performance, testing, and deployment practices.

📊 Process & Systems Portfolio Requirements

Portfolio Essentials:

• Demonstrations of complex, interactive user interfaces built with modern JavaScript frameworks (React, Angular).

• Examples showcasing the development and maintenance of a comprehensive design system, including component documentation and usage guidelines.

• Case studies detailing the process of integrating frontend applications with backend APIs, highlighting data flow, state management, and error handling strategies.

• Projects that emphasize responsiveness, accessibility, and performance optimization, with clear explanations of the techniques employed.

• Contributions to open-source projects or personal projects that exhibit a strong understanding of UI engineering principles and architectural patterns. Process Documentation:

• Evidence of establishing and documenting frontend development workflows, including coding standards, code review processes, and component development methodologies.

• Examples of how you've approached architectural decisions for frontend applications, including trade-offs considered and rationale behind choices.

• Documentation related to design system evolution, governance, and best practices for component creation and maintenance.

• Case studies on optimizing frontend performance and implementing accessibility features, detailing the problem, solution, and impact.

📝 Enhancement Note: The portfolio requirements are specifically tailored for a UI Engineer role focused on architecture and design systems. Emphasis is placed on demonstrating practical application of core skills, design system maturity, and architectural thinking, which are critical for a senior position establishing frontend foundations.

💵 Compensation & Benefits

Salary Range: Based on industry benchmarks for a Senior UI Engineer with 5-10 years of experience in the Boston/NYC tech market, the estimated annual salary range is $140,000 - $180,000 USD. This estimate considers the company's focus on advanced AI technology, the financial services sector, and the hybrid work model.

Benefits:

• Competitive Salary: Offering a strong base salary reflecting experience and market value.

• Comprehensive Benefits Package: Including health, dental, and vision insurance.

• Stock Options: Potential for equity in a rapidly growing AI startup.

• 401(k) Plan: With potential company matching.

• Professional Development: Opportunities for training, conferences, and certifications.

• Hybrid Work Environment: Flexibility to balance remote and in-office work.

• Generous Paid Time Off (PTO): Including vacation, sick leave, and holidays.

• Parental Leave: Supportive policies for new parents.

Working Hours: The standard working hours are approximately 40 hours per week, with flexibility offered due to the hybrid work arrangement. Core working hours may be established to ensure team collaboration and meeting availability.

📝 Enhancement Note: A salary range has been estimated based on the provided experience level, location (Boston/NYC), and the company's industry (AI/FinTech). The benefits are expanded to include typical offerings for tech startups in this space, with a focus on professional growth and work-life balance.

🎯 Team & Company Context

🏢 Company Culture

Industry: Technology / Artificial Intelligence / Financial Services Automation. OnCorps AI operates at the intersection of cutting-edge AI technology and the critical needs of the financial services industry, specifically targeting middle and back-office automation. This positions them as a disruptor in a traditionally conservative sector, requiring a blend of innovation and reliability.

Company Size: Startup (likely 50-200 employees based on typical growth stages for companies with enterprise solutions). This size implies a dynamic, fast-paced environment where individual contributions have a significant impact, and there's a strong emphasis on agility and rapid iteration.

Founded: The founding date is not specified, but the description of delivering "production-ready AI agents" suggests a company that has moved beyond the ideation phase and is established enough to serve large financial institutions.

Team Structure:

• The UI Engineering team is likely small but highly impactful, working closely with dedicated design and backend engineering teams.

• Reporting structure will probably involve a Engineering Manager or Head of Engineering, with direct collaboration across Product and Design departments.

• Cross-functional collaboration is essential, with UI Engineers acting as a critical bridge between the visual design vision and the functional backend systems supporting AI agentic workflows. Methodology:

• Data-driven decision-making for UI development, leveraging user feedback and analytics to refine interfaces.

• Agile development methodologies, focusing on rapid iteration, modular component development, and continuous integration/delivery.

• Emphasis on creating highly modular and interchangeable UI components to support rapid evolution of the AI framework.

• Collaborative approach to problem-solving, encouraging open communication and knowledge sharing among engineering, design, and product teams.

Company Website: https://oncorps.ai/ (derived from domain)

📝 Enhancement Note: The company culture is inferred to be innovative, fast-paced, and collaborative, typical of a growth-stage AI startup serving enterprise clients. The emphasis on "Agentic AI" and financial operations implies a need for robust, secure, and highly reliable technology, which will shape the team's approach to development and quality assurance.

📈 Career & Growth Analysis

Operations Career Level: Senior UI Engineer. This role is pivotal in establishing the technical foundation for the company's user interfaces. It requires not only strong coding skills but also architectural foresight, leadership in design system implementation, and the ability to mentor junior engineers. The scope includes influencing the direction of frontend technology within the company.

Reporting Structure: The UI Engineer will likely report to an Engineering Manager or Director of Engineering. This role involves close collaboration with UI/UX Designers, Product Managers, and Backend Engineers, forming a core product development team.

Operations Impact: The UI Engineer's work directly impacts the usability and adoption of OnCorps' AI solutions by enterprise clients. By creating intuitive, efficient, and accessible interfaces, they enable financial institutions to better leverage the company's agentic AI for automation. This translates directly to measurable operational efficiency and accuracy improvements for clients, reinforcing the company's value proposition.

Growth Opportunities:

• Technical Leadership: Opportunity to become a lead architect for frontend development, guiding technical strategy and mentoring a growing team.

• Specialization: Deepen expertise in AI-driven UI development, accessibility, or performance optimization within the FinTech space.

• Cross-Functional Leadership: Transition into product management or lead cross-functional initiatives bridging design, engineering, and AI research.

• Startup Growth: As the company scales, opportunities for leadership roles within engineering management or specialized technical domains will emerge.

📝 Enhancement Note: This analysis frames the UI Engineer role as a significant growth opportunity within a scaling AI startup. It highlights the potential for technical leadership and specialization, crucial for attracting senior talent motivated by impact and career advancement.

🌐 Work Environment

Office Type: Hybrid. This model allows for a blend of remote work flexibility and in-office collaboration, catering to individual preferences while fostering team cohesion and knowledge sharing.

Office Location(s): Boston and New York City. These are major tech hubs, offering access to talent and a vibrant ecosystem. The hybrid nature means employees may be expected in the office a few days a week, depending on team needs and project phases.

Workspace Context:

• Collaborative Spaces: Offices are likely designed to encourage collaboration, with meeting rooms, breakout areas, and communal spaces for team interaction.

• Technology Enabled: Access to modern development tools, high-performance workstations, and reliable network infrastructure to support complex frontend development and AI workloads.

• Team Interaction: Opportunities for regular interaction with design, product, and backend engineering teams, facilitating efficient communication and problem-solving. The hybrid model will require intentional efforts to foster connection.

Work Schedule: While a standard 40-hour work week is typical, the hybrid arrangement and startup environment suggest flexibility. Emphasis will be placed on delivering results and meeting project milestones rather than strict adherence to hours, provided core collaboration needs are met.

📝 Enhancement Note: The hybrid work environment is detailed to provide clarity on expectations regarding in-office presence and the benefits of working in major tech hubs. The workspace context is elaborated to reflect a modern tech company setup that supports collaborative and productive development.

📄 Application & Portfolio Review Process

Interview Process:

• Initial Screening: A brief call with a recruiter to assess basic qualifications, cultural fit, and salary expectations.

• Technical Assessment (Coding Challenge): A take-home coding exercise or live coding session focusing on JavaScript/TypeScript proficiency, component development, and problem-solving skills. This will likely involve building a small UI component or solving a specific frontend challenge that mirrors real-world tasks.

• Technical Deep Dive: In-depth interview with engineering peers and/or the hiring manager to discuss your experience, architectural approach, and problem-solving methodologies. Expect questions about React/Angular, state management, API integration, and design systems.

• Portfolio Review & System Design: A session dedicated to reviewing your portfolio. Be prepared to walk through 1-2 significant projects, discussing your role, technical decisions, challenges faced, and solutions implemented. This may also include a system design component related to frontend architecture or a design system.

• Behavioral & Cultural Fit Interview: Questions assessing your collaboration style, how you handle feedback, your approach to learning, and your alignment with OnCorps' values and mission.

Portfolio Review Tips:

• Curate Strategically: Select 2-3 projects that best showcase your expertise in building scalable UIs, working with design systems, and integrating with APIs. Prioritize projects that demonstrate architectural thinking and problem-solving.

• Focus on Impact: For each project, clearly articulate the problem you were solving, your specific contributions, the technologies used, and the measurable outcomes or impact achieved. Quantify results where possible (e.g., performance improvements, user engagement).

• Design System Emphasis: If showcasing a design system, highlight its structure, component catalog, documentation process, and how it facilitated faster development and maintained consistency. Demonstrate your role in its creation or evolution.

• Technical Depth: Be ready to discuss technical challenges, architectural decisions, trade-offs, and trade-offs. Explain why you made certain choices.

• Visual Presentation: Ensure any live demos or screenshots are clean, professional, and effectively communicate the user experience.

Challenge Preparation:

• Frontend Fundamentals: Brush up on core JavaScript, HTML, and CSS concepts, as well as modern web performance and accessibility standards.

• Framework Proficiency: Be prepared to code and discuss best practices in React or Angular, including state management and component lifecycle.

• Design System Principles: Understand how to build and maintain modular, reusable components and the role of tools like Storybook.

• API Integration: Practice scenarios involving fetching data, handling asynchronous operations, and managing API responses.

• Problem-Solving: Prepare to articulate your thought process for breaking down complex problems and arriving at efficient solutions.

📝 Enhancement Note: The interview process is detailed to provide a clear roadmap for candidates. The portfolio review tips are specifically geared towards a UI Engineer role, emphasizing architectural contributions and design system experience, which are key requirements for this position.

🛠 Tools & Technology Stack

Primary Tools:

• Core Frameworks: React, Angular (with deep expertise in at least one).

• Languages: JavaScript (ES6+), TypeScript.

• Styling: Modern CSS methodologies (e.g., CSS Modules, Styled Components, Emotion), SASS/LESS.

• Component Development & Documentation: Storybook.js.

• State Management: Redux, Zustand, Recoil (for React); NgRx, RxJS (for Angular).

• Build Tools: Webpack, Vite, Rollup.

Analytics & Reporting:

• Frontend Analytics: Tools for tracking user behavior, performance metrics, and feature adoption (e.g., Google Analytics, Amplitude, custom dashboards).

• Performance Monitoring: Browser developer tools, Lighthouse, WebPageTest for diagnosing and optimizing application speed and responsiveness.

CRM & Automation:

• While not directly in the UI Engineer's domain, understanding how frontend applications interact with backend systems, potentially including CRM or operational dashboards, is beneficial. Knowledge of how data flows from the UI to backend processes for AI agent execution is key.

• API Integration: RESTful APIs, GraphQL.

• Middleware: Understanding of how frontend applications communicate with backend services and middleware layers.

📝 Enhancement Note: The technology stack is detailed based on the job description's requirements for React/Angular, TypeScript, and Storybook.js, and includes related technologies commonly used in modern frontend development for enterprise applications.

👥 Team Culture & Values

Operations Values:

• Innovation & Agility: A culture that embraces rapid iteration, experimentation with new technologies (especially AI-driven), and a willingness to adapt quickly to market demands and product evolution.

• User-Centricity: A strong focus on understanding and serving the user, ensuring that the technology and interfaces are intuitive, efficient, and provide tangible value to financial institutions.

• Collaboration & Transparency: Open communication channels, shared ownership of projects, and a commitment to transparent decision-making processes. Expect active participation in cross-functional teams.

• Excellence & Quality: A dedication to building robust, scalable, and high-quality software. This includes a commitment to code quality, accessibility, performance, and thorough testing.

• Data-Driven Approach: Utilizing data and analytics to inform design and development decisions, measure impact, and continuously improve product offerings.

Collaboration Style:

• Cross-Functional Integration: UI Engineers are expected to work seamlessly with designers, product managers, and backend engineers, acting as a bridge between disciplines.

• Feedback-Oriented: An environment where constructive feedback is regularly exchanged during code reviews, design critiques, and team discussions to foster collective improvement.

• Knowledge Sharing: Proactive sharing of insights, best practices, and learnings through internal documentation, presentations, or pair programming sessions.

• Empowered Autonomy: While collaboration is key, individuals are empowered to take ownership of their work, make informed technical decisions, and drive initiatives forward.

📝 Enhancement Note: The team culture and values are inferred from the company's description as an AI startup in FinTech, emphasizing innovation, user focus, and collaboration. These values are framed to appeal to candidates who thrive in such environments and align with the demands of building complex enterprise software.

⚡ Challenges & Growth Opportunities

Challenges:

• Rapidly Evolving AI Landscape: Keeping pace with advancements in AI and their implications for user interface design and interaction patterns.

• Balancing Innovation with Stability: Integrating cutting-edge AI features while maintaining the robustness, security, and auditability required by financial institutions.

• Design System Scalability: Evolving and maintaining a comprehensive design system that can support a growing product suite and diverse user needs.

• Cross-Disciplinary Communication: Effectively translating complex AI concepts and backend logic into intuitive user experiences and communicating technical constraints to design and product teams.

• Hybrid Team Dynamics: Ensuring seamless collaboration and productivity within a hybrid work environment.

Learning & Development Opportunities:

• AI & ML Integration: Gaining hands-on experience with how AI and ML models are integrated into user interfaces and workflows.

• Enterprise FinTech Domain: Deepening understanding of middle and back-office operations in the financial services industry.

• Advanced Frontend Architecture: Opportunities to architect and implement complex frontend solutions, potentially exploring micro-frontend architectures or advanced state management patterns.

• Mentorship: Potential to mentor junior engineers and contribute to the growth of the engineering team.

• Industry Conferences & Certifications: Support for attending relevant conferences (e.g., AI, FinTech, Frontend Development) and pursuing certifications.

📝 Enhancement Note: The challenges and growth opportunities are tailored to the specific context of an AI startup in the FinTech space, highlighting both the exciting prospects and potential hurdles that a UI Engineer might encounter.

💡 Interview Preparation

Strategy Questions:

• Architectural Design: "Describe how you would design a scalable design system for an enterprise AI application. What key principles would you follow, and what tools would you use?" (Focus on modularity, reusability, documentation, accessibility, and integration with frameworks like React/Angular.)

• Problem-Solving & Trade-offs: "Imagine a scenario where a critical backend API is experiencing intermittent latency. How would you, as a UI Engineer, design the frontend to gracefully handle this, ensuring a positive user experience?" (Discuss strategies like optimistic UI, caching, error handling, user feedback mechanisms, and potential workarounds.)

• Collaboration & Influence: "How do you effectively collaborate with UX/UI designers to translate their vision into functional, high-fidelity interfaces, especially when technical constraints arise?" (Emphasize communication, iterative feedback loops, and proposing alternative solutions.)

Company & Culture Questions:

• AI in UI: "How do you see AI shaping the future of user interfaces, and what excites you most about building UIs for AI-powered applications?" (Showcase your forward-thinking perspective and passion for the domain.)

• Teamwork & Growth: "Describe a time you had to adapt to a rapidly changing technical environment or project requirements. How did you approach it, and what did you learn?" (Demonstrate adaptability, resilience, and a growth mindset.)

• Impact Measurement: "How would you measure the success of a new UI component or feature you've developed, beyond just bug counts?" (Focus on metrics related to user engagement, task completion, performance, and business value.)

Portfolio Presentation Strategy:

• Storytelling: Structure your portfolio walkthroughs as compelling stories. Clearly define the problem, your role and solution, the technical challenges, and the positive outcomes.

• Technical Depth: Be prepared to dive deep into the technical aspects of your projects. Explain your architectural choices, the reasoning behind them, and any trade-offs you made.

• Design System Focus: If showcasing a design system, explain its architecture, component lifecycle, contribution process, and how it benefits the development team and end-users.

• Visual Clarity: Use clear visuals (screenshots, live demos) to illustrate your points. Ensure your code examples (if requested) are well-formatted and easy to understand.

• Conciseness: Respect time limits. Focus on the most impactful aspects of your projects and be ready to answer specific questions rather than presenting every detail.

📝 Enhancement Note: The interview preparation section provides specific, actionable questions and strategies tailored to a Senior UI Engineer role at an AI FinTech company. It emphasizes the importance of demonstrating architectural thinking, problem-solving skills, and a deep understanding of design systems and collaboration.

📌 Application Steps

To apply for this UI Engineer position:

• Submit your application through the provided link on the OnCorps careers page.

• Tailor Your Resume: Highlight your experience with JavaScript, TypeScript, React/Angular, design systems (especially Storybook.js), API integrations, and any relevant experience in the financial industry or with AI technologies. Quantify achievements where possible (e.g., "Improved UI performance by X%," "Contributed to a design system used by Y teams").

• Prepare Your Portfolio: Curate 2-3 of your strongest projects that demonstrate your UI engineering skills, architectural thinking, and experience with design systems. Ensure projects are accessible and clearly explained, focusing on your specific contributions and the impact of your work.

• Practice Your Pitch: Be ready to articulate your experience, technical approach, and problem-solving skills concisely. Practice walking through your portfolio projects, emphasizing technical decisions and outcomes.

• Research OnCorps: Familiarize yourself with OnCorps' mission, their Agentic AI solution, and their target market (asset managers, fund administrators). Understand how your role as a UI Engineer contributes to their overall success in automating financial operations.

⚠️ 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.