CrawlJobs Logo

Full Stack JavaScript Engineer

yopeso.com Logo

Yopeso

Location Icon

Location:
Spain , Madrid

Category Icon
Category:
IT - Software Development

Job Type Icon

Contract Type:
Not provided

Salary Icon

Salary:

Not provided
Save Job
Save Icon
Apply Position

Job Description:

We are seeking an experienced Full Stack Developer to join our team working on an open-source AI chat platform. The successful candidate will contribute to developing and maintaining a sophisticated conversational AI application that integrates multiple AI providers and offers a rich user experience, while collaborating closely with product and design stakeholders.

Job Responsibility:

  • Develop and maintain both frontend and backend components of the AI chat platform
  • Implement new AI provider integrations and chat functionalities
  • Work with modern React-based frontend and Node.js/Express backend architecture
  • Collaborate on database design and optimization using MongoDB
  • Implement and maintain real-time features using WebSocket connections
  • Write comprehensive tests and ensure code quality through automated testing
  • Deploy and maintain containerized applications using Docker
  • Participate in code reviews and maintain high development standards

Requirements:

  • 3+ years of full-stack JavaScript/TypeScript development
  • 2+ years of React.js development with modern patterns
  • 2+ years of Node.js and Express.js backend development
  • 1+ years of MongoDB database experience
  • Proven track record with Docker and containerized applications
  • Strong problem-solving and debugging abilities
  • Excellent communication and collaboration skills
  • Ability to work independently and manage complex projects
  • Attention to detail and commitment to code quality
  • Adaptability to rapidly evolving AI technologies
  • Frontend Development: React.js (v18+) with modern hooks and functional components, TypeScript for type-safe development, Vite for build tooling and development server, TailwindCSS for styling and responsive design, Radix UI and Headless UI for accessible component libraries, Tanstack Query (React Query) for data fetching and state management, React Router for client-side routing, State management with modern React patterns
  • Backend Development: Node.js (v18+) with Express.js framework, MongoDB with Mongoose ODM for database operations, PostgreSQL structured data storage, Redis for caching and session management, RESTful API design and implementation, JWT and session-based authentication
  • DevOps & Infrastructure: Docker and Docker Compose for containerization, MongoDB database administration, Environment configuration and secrets management
  • Development Tools: Git with advanced workflows (rebasing, merging, conflict resolution), ESLint and Prettier for code quality

Nice to have:

  • Experience working closely with Product Managers or in product-driven environments
  • Ability to contribute to product decisions, user experience improvements, and feature prioritization
  • Understanding of product lifecycle, user needs, and data-driven decision making
  • Experience with real-time applications and WebSocket implementation
  • Experience with Kubernetes and advanced container orchestration
  • Experience with performance monitoring and observability tools
  • Familiarity with progressive web app (PWA) development
  • npm workspaces for monorepo management
  • Bun runtime familiarity
  • Jest and Cypress or Playwright for testing (unit, integration, e2e)
  • AI & Integration: Experience with OpenAI API, Anthropic Claude, or similar LLM APIs
  • Understanding of prompt engineering and AI model integration
  • LangChain framework for AI application development
  • RAG (Retrieval-Augmented Generation) implementation experience

Additional Information:

Job Posted:
April 16, 2026

Work Type:
Hybrid work
Icon
Yopeso - All Job Offers
Job Link Share:
Copy Link Icon
Facebook Icon Twitter Icon LinkedIn Icon

Looking for more opportunities? Search for other job offers that match your skills and interests.

Briefcase Icon

Similar Jobs for Full Stack JavaScript Engineer

Senior Full Stack Software Engineer

We're looking for a Senior Full Stack Software Engineer to join our team, passio...
Location
Location
India , Bengaluru
Salary
Salary:
Not provided
https://www.atlassian.com Logo
Atlassian
Expiration Date
Until further notice
Flip Icon
Requirements
Requirements
  • 7+ years of industry experience working as a Full Stack Engineer.
  • Bachelor's or Master's degree (preferably a Computer Science degree or equivalent experience).
  • Specialization in Javascript (ES6), HTML5, CSS.
  • Experience with modern Javascript frameworks (React Preferred).
  • Familiarity with server-side software development in software design, object-oriented programming (preferred experience with Java, NodeJs).
  • Experience with modern testing frameworks (e.g., Jest, Cypress, Mocha, Chai).
  • Familiarity with A/B testing.
  • Good understanding of front-end architecture and data-driven development.
  • Experience building and integrating REST APIs and GraphQL.
  • Experience with SQL and basic data and numerical analysis.
Job Responsibility
Job Responsibility
  • Guide the technical direction and implementation of large-scale product features.
  • Evaluate trade-offs between correctness, robustness, performance and customer impact to ensure we build the right solution.
  • Collaborate with product, design and engineering to influence product strategy and direction.
  • Ship well-tested, secure, reliable, and maintainable code while keeping our customers best interests in mind.
  • React to how our product is used in the wild, and help to fix bugs and production issues as they occur.
  • Contribute to code reviews, documentation, and complex bug fixes with security, performance and reliability in mind.
  • Mentor and level up the skills of your teammates by sharing your expertise.
What we offer
What we offer
  • Health coverage
  • paid volunteer days
  • wellness resources
  • Fulltime
Read More
Arrow Right

Sase Cloud Full Stack Engineer

This role focuses on full stack development for Silver Peak Orchestrator web app...
Location
Location
United States , San Jose
Salary
Salary:
117500.00 - 270000.00 USD / Year
https://www.hpe.com/ Logo
Hewlett Packard Enterprise
Expiration Date
Until further notice
Flip Icon
Requirements
Requirements
  • Minimum 5 years of experience in Java-based server-side development
  • Proven track record of developing database applications using SQL and NoSQL
  • Experience in HTML, CSS, JavaScript, React, Node.js and REST API
  • Experience in orchestrating AWS, Azure, GCP, or other cloud services
  • Experience in developing web applications for cloud deployments
  • Complete ownership, problem-solving skills and tremendous self-drive
  • Strong written and verbal communication skills
  • Bachelor's degree or equivalent in Computer Science or Computer Information Systems/Applications
  • Cloud Architectures, Cross Domain Knowledge, Design Thinking, Development Fundamentals, DevOps, Distributed Computing, Microservices Fluency, Full Stack Development, Release Management, Security-First Mindset, User Experience (UX)
Job Responsibility
Job Responsibility
  • Develop new features for Silver Peak Orchestrator web application
  • Manage SD-WAN enabled networks
  • Responsible for backend and frontend software development for web applications
  • Know white box unit test cases for your implementations
  • Collaborate with remote teams
What we offer
What we offer
  • Comprehensive suite of benefits that supports physical, financial and emotional wellbeing
  • Specific programs catered to career development
  • Inclusive work environment
  • Flexibility to manage work and personal needs
  • Fulltime
Read More
Arrow Right

Senior Growth Full-Stack Engineer

Senior Growth Full-Stack Engineer role at Seamless.AI focusing on user activatio...
Location
Location
United States
Salary
Salary:
Not provided
https://seamless.ai/ Logo
Seamless.AI
Expiration Date
Until further notice
Flip Icon
Requirements
Requirements
  • 5+ years of experience as a full-stack engineer (startup or growth-focused environment preferred) with SaaS product
  • Strong proficiency in modern JavaScript/TypeScript (React.js, Node.js)
  • Proficiency with modern database technologies (PostgreSQL, Vector DBs, OpenSearch, DynamoDB)
  • Proficiency with Cloud architecture and scalability best practices, in particular AWS (Lambda, serverless, cloud-native services)
  • Hands-on experience with A/B testing platforms (GrowthBook, Optimizely, LaunchDarkly, etc.)
  • Familiarity with feature flag systems and controlled experiment rollout strategies
  • Experience with product analytics tools (Amplitude, Segment, Tableau)
  • Ability to translate growth hypotheses into technical experiments quickly and iteratively
  • Strong data-driven mindset with the ability to evaluate experiment outcomes statistically
  • Comfortable working in fast-moving, cross-functional growth teams
Job Responsibility
Job Responsibility
  • Collaborate with growth, product, and data teams to design and implement A/B tests and growth experiments focused on user activation
  • Build, deploy, and maintain full-stack features and experiment infrastructure (frontend + backend)
  • Implement and manage feature flagging systems to enable rapid testing and controlled rollouts
  • Work with GrowthBook (or similar experimentation platforms) to set up, track, and analyze experiments
  • Instrument and track user behavior in Amplitude and other analytics platforms to generate insights
  • Write clean, scalable, and maintainable code across the React frontend and Node.js backend
  • Monitor and evaluate experiment outcomes, providing actionable insights and recommendations
  • Balance speed of experimentation with engineering best practices, ensuring quality while moving quickly
  • Fulltime
Read More
Arrow Right

Senior Full Stack Data Engineer

Senior Full Stack Data Engineer role in Citi's Chief Technology Office (CTO) Tec...
Location
Location
India , Pune
Salary
Salary:
Not provided
https://www.citi.com/ Logo
Citi
Expiration Date
Until further notice
Flip Icon
Requirements
Requirements
  • Minimum of 8 years of proven experience in software development
  • Significant experience as a Data Engineer and Full Stack Developer
  • Strong proficiency in SQL for data querying, manipulation, and optimization
  • Experience with NoSQL databases, such as MongoDB
  • Expertise in designing and developing data pipelines for ingestion, transformation, and processing of large datasets
  • Deep understanding of multithreading, thread pools, Object-Oriented Programming (OOP) concepts, and design patterns
  • Demonstrated experience working in an Agile software development environment
  • Excellent communication, problem-solving, and analytical skills
  • Proficiency in at least one of the following programming languages: Java or Python
  • Strong knowledge of DevOps practices, including source control management (e.g., Git), Continuous Integration (CI), Continuous Delivery/Deployment (CD), and automated deployments
Job Responsibility
Job Responsibility
  • Design and develop scalable data solutions leveraging platforms such as Iceberg, Snowflake, Trino, or other modern data ecosystems
  • Design, build, and optimize robust Extract, Load, Transform (ELT) and Extract, Transform, Load (ETL) data pipelines
  • Collaborate effectively with domain experts, product managers, analysts, and data scientists to understand data requirements and deliver efficient data solutions
  • Enable advanced analytics and machine learning workflows by ensuring the delivery of high-quality, reliable, and timely data
  • Implement and manage CI/CD pipelines to automate data engineering workflows across both cloud and on-premises environments
  • Research, evaluate, and recommend the integration of open-source technologies into our data platform
  • Clearly communicate complex technical details, project progress, and challenges to both technical and non-technical stakeholders
  • Design, develop, and implement scalable full-stack applications using technologies such as JavaScript, ReactJS, NodeJS, Python, and SQL/NoSQL databases
  • Write clean, efficient, well-documented, and maintainable code, adhering to industry best practices
  • Fulltime
Read More
Arrow Right

Full-Stack JavaScript Developer

We are looking for a Full-Stack JavaScript Developer (Node.js + Vue.js) to join ...
Location
Location
Portugal
Salary
Salary:
Not provided
ascendixtech.com Logo
Ascendix Tech
Expiration Date
Until further notice
Flip Icon
Requirements
Requirements
  • 4+ years of commercial experience with JavaScript/TypeScript
  • 3+ years of commercial experience with Node.js on the back end
  • Experience building and maintaining REST/JSON APIs
  • Solid understanding of authentication/authorization, error handling, and logging
  • 2+ years of commercial experience with a modern front-end framework
  • Vue.js is preferred (React experience acceptable, with readiness to work in Vue)
  • Experience building SPA dashboards, forms, data grids, and filters
  • Experience working as a true full-stack developer (same engineer owning both backend and frontend features end-to-end)
  • Strong knowledge of SQL and experience integrating applications with analytical/OLAP stores (Snowflake, Redshift, BigQuery, or similar)
  • Experience integrating with external APIs and third-party services
Job Responsibility
Job Responsibility
  • Work as a full-stack engineer, owning features from API to UI: Develop and maintain Node.js backend services for data ingestion, processing, and application logic
  • Implement Vue.js frontend components and pages (forms, tables, filters, dashboards)
  • Collaborate with solution architects and data engineers to: Consume and expose data from Snowflake and other data sources
  • Align on data models and contracts between the application and the data warehouse
  • Integrate with: Chrome extension–based data capture flows
  • External data providers and internal APIs
  • Ensure code quality: Write clean, testable, maintainable code in both the back end and the front end
  • Participate in code reviews, refactoring, and technical design discussions
  • Contribute to architecture and technical decisions for the MVP and further phases
  • Collaborate with PM/BA and client stakeholders, clarify requirements, and propose implementation options
What we offer
What we offer
  • Health insurance
  • Vacation days: 22 days per year
  • Paid Time off Benefits
  • Meal Card
  • Friendly and calm atmosphere in the company
  • Career and professional growth: Individual development plan
  • Technical leads and mentors
  • Open management and well-established processes
  • Regular performance reviews
  • Free access to the company accounts on educational platforms (Udemy, Pluralsight)
  • Fulltime
Read More
Arrow Right

Senior Software Engineer - Java Full Stack - Futures Engineering

As a Developer, you will be enhancing and maintaining an enterprise Cleared Deri...
Location
Location
United States , Chicago
Salary
Salary:
185000.00 - 215000.00 USD / Year
clearstreet.io Logo
Clear Street
Expiration Date
Until further notice
Flip Icon
Requirements
Requirements
  • 5+ years of professional experience in back-end development with Java
  • 3+ years of experience within a financial institution, preferably in FCM (Futures Commission Merchant) or Broker-Dealer environments
  • Ability to work under pressure and meet deadlines
  • Experience building microservices
  • Strong understanding of design patterns, multithreading, and performance optimization
  • Strong problem-solving skills and ability to debug complex systems
  • Hands-on experience with Apache Kafka for event streaming and messaging
  • Proficiency in MongoDB or AWS DocumentDB for NoSQL database design and querying
  • Familiarity with Apache Solr for search and indexing, Apache ZooKeeper for distributed system coordination, and HashiCorp Vault for secrets management
  • Experience with Kubernetes for container orchestration and deployment
Job Responsibility
Job Responsibility
  • Working in a project team alongside other developers to architect, develop, and optimize server-side applications, RESTful APIs, and microservices using Java
  • Implement event-driven architectures with Apache Kafka and for real-time data processing
  • Contribute to front-end development using ReactJS, focusing on integrating UI components with back-end services
  • Optimize application performance, security, and reliability
  • Deploy and manage applications in Kubernetes clusters, ensuring high availability and scalability
  • Provide technical support for application
  • Collaborate with cross-functional teams across the organization to architect solutions and deliver robust features
  • Participate in code reviews, unit testing, and CI/CD pipeline maintenance
What we offer
What we offer
  • competitive compensation packages
  • company equity
  • 401k matching
  • gender neutral parental leave
  • full medical, dental and vision insurance
  • lunch stipends
  • fully stocked kitchens
  • happy hours
  • Fulltime
Read More
Arrow Right

Full Stack Engineering Intern

As a full-stack software engineer, you will have the options to work on differen...
Location
Location
Canada , Toronto
Salary
Salary:
30.00 - 50.00 USD / Hour
cresta.com Logo
Cresta
Expiration Date
Until further notice
Flip Icon
Requirements
Requirements
  • Experience coding in modern programming languages like Python, Go, Java for backend and JavaScript, TypeScript for frontend
  • Understanding of the modern front-end ecosystem and experience applying frameworks/tools (React.js, Webpack, and Node.js) and patterns to complex, production web applications
  • Comfortable defining and building robust APIs with a strong understanding for different protocols like REST, RPC frameworks, Websockets etc
  • Experience with database schema design and an understanding of query performance that translates to performant, scalable, and reactive products
Job Responsibility
Job Responsibility
  • Collaborate with senior engineers on the team to write and push high-quality code efficiently for both the frontend and backend
  • Build exciting products in which ML/AI is applied at the core as a major differentiator for the product
  • Identify and leverage opportunities to improve general engineering productivity
  • Integrate with various tools for CI/CD, test automation, monitoring, logging, documentation
What we offer
What we offer
  • Lunch can be expensed (up to $25) while working in the office
  • Fulltime
Read More
Arrow Right

Senior Engineer I - Full Stack Java

We are seeking a highly skilled Senior Engineer to join our team. In this role, ...
Location
Location
India , Noida
Salary
Salary:
Not provided
daxko.com Logo
Daxko
Expiration Date
Until further notice
Flip Icon
Requirements
Requirements
  • 5– 6 years of professional software development experience
  • Strong expertise in Java and solid experience with JavaScript
  • Proven experience in designing and scaling enterprise-level applications
  • Familiarity with RESTful APIs, relational and non-relational databases
  • Hands-on experience with cloud platforms (AWS, GCP, or Azure) is a plus
  • Strong leadership, mentoring, and communication skills
  • Ability to work in an agile, collaborative team environment
Job Responsibility
Job Responsibility
  • Lead the design and development of backend services using Java
  • Contribute to frontend components and integrations with JavaScript where required
  • Collaborate with product managers, designers, and engineers to deliver impactful features
  • Ensure high-quality code through reviews, testing, and best practices
  • Mentor and guide junior engineers in coding, architecture, and problem-solving
  • Optimize application performance, scalability, and reliability
  • Stay current with evolving technologies and propose improvements
What we offer
What we offer
  • Hybrid work model
  • Leave entitlements
  • Hospitalization/caregiving leaves
  • Paid parental leaves (Maternity, Paternity, & Adoption)
  • Group Health Insurance
  • Accidental Insurance
  • Tax-saving reimbursements
  • Provident Fund (PF)
  • Casual work environments
  • Company Events and Celebrations
  • Fulltime
Read More
Arrow Right
Remote jobs Jobs by Category
Art and Entertainment Jobs Banking Jobs Call Center Jobs Construction Jobs Consulting Jobs Customer Service Jobs Education Jobs Energy Jobs Finance Jobs Gastronomy Jobs Health and Beauty Jobs Hospitality and Tourism Jobs Human Resources Jobs Insurance Jobs IT - Administration Jobs IT - Software Development Jobs Legal Jobs Logistics Jobs Manufacturing Jobs Marketing, Digital Marketing, SEO, SEM Jobs Media Jobs Nursing Jobs Office Administration Jobs Pharmacy Jobs Physical Work Jobs Public Relations Jobs Public Sector Jobs Purchasing Jobs Quality Control Jobs Real Estate Jobs Research and Development Jobs Sales Jobs
Job Positions Jobs by Country
United States Jobs United Kingdom Jobs India Jobs Canada Jobs Australia Jobs Germany Jobs Ireland Jobs Poland Jobs
Company
Blog Salaries About Us Contact
Follow Us
Facebook
X (Twitter)
LinkedIn
Instagram
CrawlJobs Group
ITFlashcards AllDevBlogs
© 2026 CrawlJobs Ltd. All Rights Reserved
Terms & Conditions Privacy Policy