Senior Full Stack Developer (Backend Heavy)

Senior Software Engineer — JavaScript Full-Stack

Experience: 4–6 years Location: Ahmedabad (Work from Office)

About the Role

We're hiring a senior engineer who can own systems end-to-end on live, production JavaScript/TypeScript applications. You'll work across React frontends, Node backends, and the databases behind them — you don't need to be the deepest expert in every layer, but you should be strong across the stack and able to make architectural calls that hold up.

This role involves real client interaction, technical decision-making, and shipping into production — not just executing tickets. You'll also be someone the mid-level and junior engineers learn from.

What You'll Do

• Design, build, and maintain scalable full-stack applications running in production
• Own technical decisions on architecture, data modeling, deployments, and performance trade-offs
• Debug live issues across the stack, identify bottlenecks, and improve performance
• Participate in client conversations: scoping, technical discussions, demos, and updates
• Review code and raise the team's bar — including the judgment to catch when AI-generated code is subtly wrong, overengineered, or a poor fit
• Mentor junior and mid-level engineers and contribute to team engineering standards
• Continuously evaluate and adopt tools and practices that improve delivery
• Work in an Agile / Scrum setup with regular delivery cycles

Must-Have

• 4–6 years building and shipping production JavaScript/TypeScript applications
• Strong full-stack ability — genuinely comfortable owning both React frontends and Node backends; can architect a feature from UI to data layer
• Deep JavaScript and TypeScript — language fundamentals, async patterns, typing discipline, and the ability to teach these to less experienced engineers
• Strong React — advanced hooks, state management, performance optimization, component architecture, and structuring large apps
• Strong Node backend — REST (and ideally some GraphQL or real-time) APIs, auth, error handling, and integrating third-party services; experience with Express, Nest, or similar
• Solid SQL and NoSQL — data modeling across relational and document paradigms; able to pick the right store for the problem and design schemas that hold up under load and change (PostgreSQL, MySQL, MongoDB, or similar)
• Hands-on AWS — deploying and operating applications, comfortable picking up new services, and debugging issues in production cloud environments
• System design fundamentals — caching (Redis/Memcache), queues, REST/API design, and an understanding of scaling and reliability trade-offs
• Track record on live production systems — operating, supporting, and evolving systems, not only greenfield builds or POCs
• Git workflows in a team — branching, reviews, conflict resolution
• Day-to-day use of AI coding tools (Cursor, GitHub Copilot, Claude Code, or similar) and a point of view on where they help vs. hurt
• Strong communication — can explain technical decisions to clients and non-technical stakeholders
• Independence — breaks down ambiguous problems, designs solutions, and ships without hand-holding

Strong Plus (one or more)

Architecture & Scale

• Microservices, API gateways, event-driven patterns
• Caching strategies, queue-based processing, eventual consistency
• Real-time systems (WebSockets, SSE)

Frontend Depth

• Next.js (SSR/SSG), advanced performance work, design systems
• Accessibility and cross-platform/responsive expertise
• React Native

DevOps / Platform

• CI/CD pipelines, Docker, infrastructure-as-code
• Observability and production monitoring

AI Engineering

• LLM-powered features: RAG, agentic workflows, tool use
• Vector databases (Pinecone, Weaviate, Qdrant, pgvector)
• Prompt engineering, evals, and observability for LLM apps

Nice to Have

• Automated testing depth (unit, integration, e2e)
• Security fundamentals: auth flows, secrets management, OWASP basics
• 
  

About the Role: We’re looking for a Full-Stack Developer who is comfortable working across both web and mobile platforms to join our growing tech team. You will be responsible for developing user-facing applications, building scalable backend services, and deploying high-quality digital experiences that impact real users. This is an exciting opportunity to work in a dynamic startup environment, where you’ll play a critical role in shaping both product and technology. You’ll collaborate closely with our design, backend, and product teams to develop and maintain new features across our platforms. We’re not just looking for a coder - we’re looking for someone passionate about solving problems, learning fast, and building user-first experiences across devices.

Responsibilities: Web Development Develop responsive web interfaces using React.js, JavaScript, HTML, and CSS. Optimize frontend performance for mobile and desktop platforms. Work closely with UI/UX designers to implement intuitive user experiences. Mobile App Development Build and maintain cross-platform mobile apps using React Native (or Flutter, if applicable). Ensure smooth user experience and performance across Android and iOS devices. Manage versioning, updates, and publishing to Play Store and App Store. Backend Development Develop and maintain backend APIs using Node.js and Express.js. Integrate with MongoDB / MySQL databases for data persistence. Work with third-party APIs and handle authentication, authorization, etc. DevOps & Deployment Handle app deployment pipelines and basic CI/CD workflows. Monitor, debug, and resolve production issues. Use Git and version control best practices for code collaboration.

Bonus Skills (Nice to Have): Experience with TypeScript, Firebase, AWS, or Expo Familiarity with push notifications, in-app purchases, etc. Basic knowledge of server-side rendering or Next.js Experience with analytics, performance monitoring, or testing frameworks

Job Description: 

• Experience in Core Java, Spring Boot. 

• Experience in microservices. 

• Extensive experience in developing enterprise-scale systems for global organization. Should possess good architectural knowledge and be aware of enterprise application design patterns. 

• Should be able to analyze, design, develop and test complex, low-latency client-facing applications. 

• Good development experience with RDBMS in SQL Server, Postgres, Oracle or DB2 

• Good knowledge of multi-threading 

• Basic working knowledge of Unix/Linux 

• Excellent problem solving and coding skills in Java 

• Strong interpersonal, communication and analytical skills. 

• Should be able to express their design ideas and thoughts. 

Requirements

• 4+ years of experience in professional Web Development
• Proven software development experience in Core PHP, Codeigniter, WordPress; Laravel is a plus.
• Must have 2+ yrs experience in VueJs.
• Experience in ReactJs, NodeJs is a plus.
• Excellent Software Design and Architecting capabilities
• Complete familiarity with client-side scripting and Angular JS, Ember JS , JavaScript frameworks, including jQuery.
• Complete familiarity and expertise in web markup, including HTML5, CSS3.
• Expertise in third party API integration - payment gateways, Storage, Streaming services, etc.
• Complete familiarity and experience working with JSON / XML and REST API structure
• Familiar with Continuous Integration/Continuous Deployment technologies such as Bitbucket, Jenkins and Git
• AWS/Google Cloud Deployment is a must; Devops capability is a plus.
• Excellent knowledge of relational databases, version control tools and of developing web services.
• Sound Database experience with MySQL and PostgreSQL experience
• A sound knowledge of Object-Oriented (OOPS) Programming & Design Pattern.
• Agile and Iterative (TDD) development expertise.

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 the latest technologies and skills including product design and architecture. 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:
- Work alongwith teams and product managers to ideate software solutions. 
- Design, build and develop front end application features.
- Design, build and develop microservices and backend server applications.
- Designing and scaling databases and servers.
- Ensuring analysis, efficiency, responsiveness and cross-platform compatibility of applications through captured  metrics, testing frameworks, and debugging methodologies.
- Owning and delivering end-to-end products, features, enhancements.
- Hands-on coding and development.
- Technical documentation through all stages of development

Requirements:
- Degree in Computer Science or related discipline with 6-10 years of experience.
- Hands on with Reactjs or similar framework/library.
- Proficiency with server side languages such as Nodejs, Python.
- Proficiency with at least one no-sql database such as MongoDB.
- Good understanding of CI/CD processes.
- Excellent verbal communication skills.
- Good problem solving skills.
- Attention to detail.
- Very high sense of ownership.
- Deep interest and passion for technology

Responsibilities-

• Deliver technical strategies and solutions, application development, and end-users services
• Lead projects to implement new or enhance existing functionalities including articulating requirements and translating them into effective technical solutions
• Build and maintain strong relationships and partnerships with team members across globe and customer stakeholders
• Work collaboratively as a team player to develop mutually acceptable solutions, and act as a mentor to the team
• Solve problems and provide support, taking responsibility to make decisions when appropriate
• Effectively communicate with team members and customers, Be able to articulate technology to a non-technical audience
• Build relationships with technical team members in all offices
• Track and manage dependencies across lines of business and platforms, Maintain technical risks register with mitigations
• Create or maintain architectural artifacts like architectural overview, architectural decisions, integrations diagram, non-functional requirements
• Collaborate with other technical team members and create a forum for sharing knowledge
• Come up with innovative ideas to improve quality in delivery
• Deploy, administer and support Microservices components in a RedHat OpenShift environment
• Should be hands-on and be ready to write complex code while mentoring junior developers to learn
• Thrive in a fast-paced and dynamic work environment and lead by example

• 15-20 years experience working on projects utilizing: Java, Web Development/REST (preferably with Spring), Linux, JUnit, Mocking, Maven, JavaScript, GIT
• Experience in the following areas are preferred – Microservices, Spring Boot, Spring Security with OAuth2, SOAP and SOAP UI, Jenkins configuration, AngularJS, RedHat PaaS (RHEL, Kubernetes, OpenShift, Camel, Fuse)
• Well versed in front end and back end development
• Good understanding of encryption technology
• Knowledge of infrastructure especially cloud infrastructure is desirable
• Should be conversant with DevOps methodologies
• At least 3 years of experience as a technical lead – coaching, presenting architectural/design elements to customers and team members
• Should possess strong problem solving and analytical skills
• Should have experience reviewing code for team members and etching out a concrete code quality plan
• Should have at least two years of experience working on projects using Test Driven Development (TDD)
• Should have 2+ years of experience using JUnit on projects
• Consistent incorporation of best practices and standards while coding; in particular: secure coding practices
• Good Exposure to building secure and scalable applications
• At least 4+ years handling customers directly should have presented architecture artifacts and technical solutions to customers and influenced customers
• Excellent communication (verbal and written) and interpersonal skills – should be able to influence customer stakeholders and senior management
• Team player and ability to work proactively, provide mentorship and directions to the team and making technical decisions independently

• BE/MCA or equivalent area
• 15-20 years of software industry experience

1. To handle the full development cycle.

2. To be responsible for timely releases of the projects.

3. To have knowledge of server AWS.

4. Knowledge of W3C standards and best practices.

5. Experience in working on Linux (Installing and configuring packages like apache, Nginx, virtual hosts, etc)

6. Ability to translate business requirements into system design and perform as per the needs

7. Knowledge of Git.