Sr Fullstack Engineer

Posted 22 Days Ago
Be an Early Applicant
4 Locations
In-Office or Remote
Senior level
Software • App development
Digital Product Agency | Top Flutter Development Company | We Design, Build & Scale Products Across Platforms
The Role
The Senior Full Stack Engineer will maintain and modernize legacy AngularJS applications, collaborate with backend teams using Node.js and MongoDB, and guide migration strategies towards React while ensuring code quality and performance optimization in an Agile environment.
Summary Generated by Built In

We are looking for a Senior Full Stack Engineer, with a strong focus on Frontend development, to work on medium to high-complexity web applications.

This role requires deep hands-on experience in AngularJS 1.9, with a strong emphasis on maintaining, refactoring, and modernizing legacy frontend codebases while ensuring performance, stability, and business continuity. The engineer will actively contribute to incremental migration strategies toward modern frontend frameworks such as React, minimizing risk and disruption.

From a full-stack perspective, the role involves close collaboration with backend teams working with Node.js and MongoDB, contributing to API integration, data modeling discussions, and performance optimization. The position demands a holistic understanding of frontend, backend, and data layers, acting as a technical bridge between product requirements and engineering execution.

The ideal candidate is a hands-on senior engineer, comfortable working in cloud-based environments, with strong code quality standards and the ability to communicate effectively in English (B2 or higher) within international Agile teams.

Must Have

  • Senior Experience: 5+ years of professional experience in software development, with a strong focus on frontend-heavy full stack web applications.

  • Frontend Expertise – AngularJS 1.9: Proven experience maintaining and evolving complex Angular 1.9 applications, including directives, scopes, digest cycle management, performance tuning, and legacy refactoring.

  • Frontend Modernization Mindset: Experience participating in gradual migrations from AngularJS to modern frameworks such as React, ensuring backward compatibility and business continuity.

  • Backend Development: Solid hands-on experience with Node.js, building and integrating REST APIs consumed by frontend applications.

  • Database Experience: Strong experience working with MongoDB, including data modeling, schema design, query optimization, and indexing strategies.

  • Full Stack Understanding: Ability to work across the entire application lifecycle, from frontend UI to backend services and data persistence.

  • Code Quality & Best Practices: Strong commitment to clean, maintainable, and scalable code, with experience in code reviews and shared quality standards.

  • English B2 or Higher (Verbal and Written): Ability to participate in technical discussions, document solutions, and collaborate with international stakeholders.

Nice to have

  • Backend Technologies: Experience with NestJS and structured backend architectures, including dependency injection and modular design.

    PHP Experience: Experience working with PHP in legacy or hybrid technology stacks.

  • Modern Frontend Frameworks: Hands-on experience with React, particularly in component-based architectures and migration scenarios.

  • Cloud & DevOps Exposure: Experience deploying and maintaining applications in cloud environments (Azure preferred), including CI/CD pipelines.

  • Testing & Tooling: Experience with testing frameworks such as Jest and solid Git-based workflows.

  • Agile Experience: Experience working in Agile/Scrum teams, collaborating with Product Managers, refinements, and estimations.

  • Mentorship: Willingness to support junior or mid-level engineers, especially around legacy frontend code and modernization efforts.

Quick Skills reference

  • Languages: JavaScript (ES6+), TypeScript, PHP

  • Frontend: AngularJS 1.x, React

  • Backend: Node.js, NestJS, Express

  • Database: MongoDB

  • Cloud / Tools: Azure, Docker, Git, CI/CD pipelines, Jest

Skills Required

  • 5+ years of professional experience in software development
  • Proven experience maintaining AngularJS 1.9 applications
  • Experience with Node.js to build and integrate REST APIs
  • Strong experience working with MongoDB
  • Commitment to clean, maintainable, and scalable code
  • Ability to communicate in English (B2 or higher)
Am I A Good Fit?
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The Company
San Francisco, California
63 Employees
Year Founded: 2019

What We Do

We’re a Digital Product Agency you can grow with, globally recognized as a Top Flutter development company. We design, build, and scale digital products by combining strong product strategy, thoughtful design, and solid engineering. With 95+ experts, we build products for any screen: mobile, web, desktop, and embedded devices, always focusing on scalability, performance, and long-term maintainability. As a company focused on custom digital products, we understand that every business has unique needs. We have experience across multiple industries, including Fintech, Healthcare, Media & Entertainment, Fashion & Beauty, Retail, Gastronomy, and Hospitality, among others. Our services include: ► Full Product Development - ​From concept to reality, our team of experts combines technical prowess with a keen eye for design, ensuring that your cross-platform app stands out amidst a sea of competitors. ► Product Discovery - ​​Navigate the market with confidence. We’ll guide you through product discovery, unlocking valuable insights and shaping products that resonate with your target audience. ► Staff Augmentation - Our expert team of Flutter developers will seamlessly integrate with your team to help you achieve your development goals and meet your deadlines. Whether you want to create a product from scratch or you need an addition to your in-house team, we are your trusted tech partner. 📩 Contact us at [email protected] and let's get started! 👉 Check out some of our success cases here https://somniosoftware.com/our-work

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