About
Numispark is a France-based web and mobile development agency. We design, build and maintain custom digital products for clients across France and Europe — mobile applications, booking and marketplace platforms, e-commerce systems and business management tools.
We work with a modern JavaScript stack across mobile and web, and we manage our own production infrastructure. Our engineering culture is remote-first, asynchronous, and built around clear written communication and end-to-end ownership of what we ship.
The Role
We are looking for a Full Stack Developer to build and deliver production applications across mobile and web. You will work across the complete development lifecycle — designing APIs, building cross-platform mobile applications, developing web interfaces, and deploying and maintaining systems in production.
This is a hands-on engineering position with real ownership of features and release cycles. You will see your work reach live users on a short cycle, and you will have meaningful input into technical and architectural decisions.
Key Responsibilities
- Develop and maintain cross-platform mobile applications using React Native for Android and iOS
- Design and build RESTful APIs with Node.js and Express
- Model, query and optimise MongoDB databases for production workloads
- Build responsive web interfaces using React and Next.js
- Deploy and maintain applications on Linux servers using Docker, including CI/CD pipelines, reverse proxy configuration, SSL and database backup procedures
- Manage Play Store and App Store submissions, versioning and release cycles
- Maintain, extend and improve existing production applications
- Participate in code reviews and follow Git-based development workflows
- Communicate progress and technical decisions clearly in written English
Required Qualifications
Experience
- 3–6 years of professional software development experience
- Minimum 2 years of hands-on experience with React Native
- At least one React Native application published on the Play Store or App Store, with a clear description of your contribution
Frontend and Mobile
- React Native — navigation, native module integration, performance optimisation, platform-specific implementation
- React.js — hooks, component architecture, state management (Redux, Zustand or Context API)
- Next.js — SSR, SSG and App Router
- Strong JavaScript ES6+ fundamentals, including asynchronous programming patterns
- TypeScript in production environments
- Firebase — push notifications, analytics and crash reporting
Backend
- Node.js and Express — REST API design, middleware, error handling
- MongoDB — schema design, indexing, aggregation pipelines, Mongoose
- Authentication and authorisation — JWT, OAuth, role-based access control
- Real-time features — WebSockets and Socket.io
- Payment gateway integration — Stripe and Razorpay
Infrastructure and DevOps
- Proficiency on the Linux command line
- Docker — writing Dockerfiles, docker-compose, container troubleshooting
- Demonstrated experience deploying and maintaining applications on self-managed servers
- Self-hosted deployment platforms — Coolify, Dokku, CapRover or equivalent
- CI/CD pipelines with GitHub Actions
- Nginx reverse proxy configuration and SSL certificate management
- Git — branching strategies, pull requests, conflict resolution
Other
- Professional written and spoken English
- Availability for a daily overlap window of 2:00 PM – 7:00 PM IST to align with European business hours
Preferred Skills
The following are not required, but strengthen an application:
Mobile
- React Native New Architecture — Fabric and TurboModules
- Native module development in Swift or Kotlin
- Automated release pipelines with Fastlane or EAS
- Offline-first architecture and local persistence (MMKV, WatermelonDB, SQLite)
- End-to-end mobile testing with Detox or Maestro
Web and Frontend
- Tailwind CSS and modern component libraries (shadcn/ui, Radix)
- Animation and interaction work — Framer Motion, GSAP, Reanimated
- Web performance optimisation — Core Web Vitals, Lighthouse
- Technical SEO fundamentals for Next.js applications
- Accessibility standards (WCAG)
Backend and Data
- Redis for caching and session management
- Job queues and background workers — BullMQ, RabbitMQ
- GraphQL and Apollo
- PostgreSQL and Prisma
- MongoDB replica sets, Atlas administration, aggregation performance tuning
- Automated testing — Jest, Vitest, Supertest
Infrastructure
- Object storage integration (S3-compatible)
- Monitoring and observability — Sentry, Grafana, Uptime Kuma
- Infrastructure automation and shell scripting
- Container orchestration basics — Docker Swarm or Kubernetes
- Database backup, restore and migration procedures at scale
Other Platforms and Tooling
- Flutter
- Shopify theme and app development
- Odoo customisation
- Mapping and geospatial development — Leaflet, Mapbox, MongoDB geospatial queries
- Transactional email and deliverability (Brevo, SendGrid, Postmark)
- AI and LLM API integration in production products
- Working from Figma designs
- Agile delivery with Jira, Linear or similar
- Clear technical documentation writing
- Working knowledge of French
What We Offer
- Competitive compensation of ₹6,00,000 – ₹8,00,000 CTC per annum, based on demonstrated experience
- Fully remote position, open to candidates across India
- Flexible working hours outside the daily overlap window
- International project exposure, working on products for European clients
- End-to-end ownership of features, from design through to production release
- Modern technology stack across mobile, web and infrastructure
- Scope to influence architecture and technical direction
- Continuous professional growth across the full engineering stack
Selection Process
- Application review
- Introductory call — 30 minutes
- Technical assignment — 4 to 6 hours, compensated
- Live technical discussion — 90 minutes, practical and collaborative
- Offer
Typical timeline from application to offer: two weeks.

About NumiSpark
About
Numispark, agence digitale, propose des solutions innovantes en développement web & mobile, marketing digital, SEO et design, adaptées à vos besoins à Caen, Bernay et Rennes Normandie.
Candid answers by the company
Remote
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Review Criteria:
- Strong Software Engineer fullstack profile using NodeJS / Python and React
- 6+ YOE in Software Development using Python OR NodeJS (For backend) & React (For frontend)
- Must have strong experience in working on Typescript
- Must have experience in message-based systems like Kafka, RabbitMq, Redis
- Databases - PostgreSQL & NoSQL databases like MongoDB
- Product Companies Only
- Tier 1 Engineering Institutes (IIT, NIT, BITS, IIIT, DTU or equivalent)
Preferred:
- Experience in Fin-Tech, Payment, POS and Retail products is highly preferred
- Experience in mentoring, coaching the team.
Role & Responsibilities:
We are currently seeking a Senior Engineer to join our Financial Services team, contributing to the design and development of scalable system.
The Ideal Candidate Will Be Able To-
- Take ownership of delivering performant, scalable and high-quality cloud-based software, both frontend and backend side.
- Mentor team members to develop in line with product requirements.
- Collaborate with Senior Architect for design and technology choices for product development roadmap.
- Do code reviews.
Ideal Candidate:
- Thorough knowledge of developing cloud-based software including backend APIs and react based frontend.
- Thorough knowledge of scalable design patterns and message-based systems such as Kafka, RabbitMq, Redis, MongoDB, ORM, SQL etc.
- Experience with AWS services such as S3, IAM, Lambda etc.
- Expert level coding skills in Python FastAPI/Django, NodeJs, TypeScript, ReactJs.
- Eye for user responsive designs on the frontend.
Perks, Benefits and Work Culture:
- We prioritize people above all else. While we're recognized for our innovative technology solutions, it's our people who drive our success. That’s why we offer a comprehensive and competitive benefits package designed to support your well-being and growth:
- Medical Insurance with coverage up to INR 8,00,000 for the employee and their family
Job Summary:
We are seeking a motivated and skilled Founding Engineer to join our innovative team in Mumbai. This role offers a unique opportunity to help shape our technology and product direction, leveraging your expertise in full-stack development using React.js, Node.js, and MySQL.
Key Responsibilities:
- Design and implement user-friendly frontend applications using React to enhance user experience.
- Develop robust server-side applications and APIs with Node.js to support our business logic and data processing needs.
- Manage and optimize MySQL databases, ensuring data integrity and performance while querying and updating data.
- Collaborate closely with cross-functional teams including product management and UX/UI to deliver cohesive product features.
- Participate in code reviews and ensure adherence to best practices in software development, maintaining high-quality code.
- Assist in troubleshooting and debugging issues across the stack, ensuring a smooth operation of our applications.
- Contribute to the architecture and roadmap of our technology platform, helping to define future iterations based on user feedback.
Requirements:
- Bachelor's degree in Computer Science, Engineering, or a related field.
- 1 to 4 years of experience in full-stack development with a focus on React.js, Node.js, and MySQL.
- Strong understanding of web technologies, including HTML, CSS, and JavaScript frameworks.
- Proficient in database management and design, particularly in MySQL.
- Excellent problem-solving skills and the ability to work in a fast-paced startup environment.
- Demonstrated ability to work collaboratively in a team and communicate technical concepts clearly.
- Passion for building innovative and scalable applications that meet user needs.
- Looking for candidate who is enthusiastic to work in a Startup environment and build things from Scratch individually
- Candidate has past experience in scalable consumer facing applications managing latency and traffic
- FullStack Individual Contributor with experience to code at speed and take full product ownership
Experience: minimum 8 YRS
Location: Vile parle (E), Mumbai
Skill Set: 8 years plus as a full stack Java/JavaScript Developer
Micro Services, Distributed Systems
Cloud Services: AWS:(EC2,S3,Lambda,Load Balancing,Serverless),Kubernates
Programming Backend: Node.js,Mongodb,Java Spring,PostGreSQL
Programming FrontEnd: ,Angular/React
Queuing: Kafka
Methodologies: Agile Scrum
Responsibilities:
End to end coding ; from software architecture to managing scaling,of high throughput(100000)RPS high volume transactions.
DIscuss business requirements and timelines with management and create a task plan for junior members.
Manage the day to day activities of all team members and report
their work progress
Mentoring the team on best coding practices and making sure modules are Live
on time.
Management of security vulnerabilities.
Be a full individual contributor which means can work in a team as well as alone.
Attitude:
Passion for tech innovation and solve problems
GoGetter Attitude
Extremely humble and polite
Experience in Product companies and Managing small teams is a plus
As a Full-Stack Developer, you will play a crucial role in developing and maintaining our applications. You will be responsible for both front-end and back-end development, ensuring a seamless and efficient user experience. This is an excellent opportunity to grow with our startup and shape the future of our products.
Responsibilities:
- Develop and maintain front-end applications using Flutter.
- Build and manage back-end services and APIs using Python.
- Implement read/write operations in SQL databases.
- Collaborate with cross-functional teams to define, design, and ship new features.
- Ensure the performance, quality, and responsiveness of applications.
- Identify and correct bottlenecks and fix bugs.
- Help maintain code quality, organization, and automatization.
Participate in code reviews and provide constructive feedback
Need High Level React Native Developer who has worked with multiple applications, Healthcare knowledge is preferable, Understand existing code and optimize it, along with create new functionalities and usability.
Should Understand Data and how to handle large volume of data in application both online and offline in application and communicate to our backend using Rest APIs
Technical Skills & Competencies: Mandatory:
Web Development – HTML, CSS, JavaScript
Frameworks – ReactJS/AngularJS
Server-side development – Python/Django/Node.js
Database: SQL or NoSQL Databases (SQL Server/ MongoDB)
API Design concepts and Development of RESTful web services
Preferable:
- Familiarity with the Development of reusable frameworks, libraries to be used by multiple development teams
- Familiarity with cloud-native application architecture patterns
- Hands-on experience on project management tools like Jira
- Experience using DevOps Tools for CI/CD
- Conversant with agile methodologies
Roles & Responsibilities
- Work independently or in a small team setup
- Manage a team of highly skilled Frontend/Full Stack and Backend developers
- Creating, executing, and maintaining project plans including activity definition, sequence, dependencies, work effort, duration, and resource requirements
- Work with the technical team, communicating requirements and ensuring all product development meets the goals of the project and overall business and strategic goals
- Project management including release management, add-on compatibility reporting, updating documentations
- Assist in other ad-hoc or administrative tasks as part of daily/routine business activities
- Work with product technical architects to design new products or enhancements. Take part in system development including analysis, coding, and testing
- Performs design and code reviews with senior technical staff
- Act like the person everyone turns to resolve tough technical problems
- Work closely with other teams/vendors to connect front-end components with the other (often third-party) web and data services and support the back-end developers by integrating their work with the application
- Mentors team on proper standards/techniques to improve their accuracy and efficiency
- Performs the unit testing, system integration testing and assist with user acceptance testing
- Articulates business requirements in sufficient detail such that a technical solution can be designed and engineered
- Develops technical understanding of how the data flows from various source
- Provide ongoing support to applications used within the organization
Requirement
- 5+ years of experience in product development, with 2+ years of experience in a leadership role in current organization
- Reliable, self-motivated, and self-disciplined individual capable of planning and executing multiple projects simultaneously within a fast-paced environment
- Exceptional debugging skills and strong experience with performance tuning
- Excellent technical, analytical, and organizational skills
- Good range of hands-on technical experience
- Expert knowledge in Systems Development Life Cycle (SDLC)
- Expert understanding of Node.js and JavaScript
- Familiarity with code revisioning and repo maintenance on Git, code profiling and auditing
Synapsica is a growth stage HealthTech startup founded by alumni from IIT Kharagpur, AIIMS New Delhi, and IIM Ahmedabad. We believe healthcare needs to be transparent and objective, while being affordable. Every patient has the right to know exactly what is happening in their bodies and they don’t have to rely on cryptic 2 liners given to them as diagnosis.
Towards this aim, we are building an artificial intelligence enabled cloud based platform to analyze medical images and create 2.0 of advanced radiologist reporting.
We are backed by Y Combinator and other investors from India, US and Japan. We are proud to have GE, AIIMS, the Spinal Kinetics as our partners.
Join us, if you find this as exciting as we do!
Description:
We are looking for a skilled computer programmer who is comfortable with both front and back end programming. Hands-on with UI and server-side is highly desirable.
You will get hands on experience in latest technologies and skills like ReactJS, NodeJS, MongoDB, REST API etc. This role is ideal for you if you have a background in Full Stack development and are looking for the next level of career growth in a fast paced, learning based and merit driven work environment.
Responsibilities:
- Developing front end app components.
- Developing back end apis and middlewares.
- Designing and scaling databases and servers.
- Ensuring responsiveness and cross-platform compatibility of applications.
- Owning and delivering end-to-end products, features, enhancements.
Requirements:
- Degree in Computer Science or related discipline with 3-7 years of exprience.
- Proficiency with fundamental front end languages such as HTML, CSS and JavaScript
- Hands on with Reactjs or similar framework/library.
- Proficiency with server side languages such as Nodejs, Python, PHP.
- Prior experience with at least one no-sql database such as MongoDB.
- Excellent verbal communication skills.
- Good problem solving skills.
- Attention to detail.
- Very high sense of ownership.
- Deep interest and passion for technology
-
7+ years of overall software development experience.
-
Hands-on experience with backend languages like Python, Java and Javascript.
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2+ years of distributed cloud systems architecture.
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Good understanding of SQL and experience in designing database structures.
-
Understanding of frontend development and frameworks at a high level.
-
High availability and fault tolerance systems design experience.
-
Test Driven Design practitioner and good understanding of unit Testing and comprehensive test suite building.
-
Customer focused with good analytical thinking and problem solving.
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Metrics based progress monitoring and reporting capabilities.
-
Flexibility to interface with cross timezone teams.
-
Should have led cross-functional teams like frontend, backend, UI/UX, devops, QA, etc.
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Experience in security practices for web applications.
Note: Hands on experience in Angular is also must.
What we offer:










