Senior Backend Engineer (Golang, SDE-III)

Job Title : Node.js Developer

Experience : 5+ Years

Location : Gurgaon – Sector 43

Work Mode : 5 Days Work From Office (WFO)

Interview Mode : Direct Walk-in

Job Summary :

We are looking for an experienced Node.js Developer with 5+ years of hands-on experience in backend development and building scalable applications.

The ideal candidate should have strong problem-solving skills and experience working in a fast-paced product or service-based environment.

Key Responsibilities :

• Develop and maintain server-side applications using Node.js.
• Design and implement RESTful APIs and microservices.
• Work with databases like MongoDB / MySQL / PostgreSQL.
• Integrate third-party APIs and services.
• Ensure performance, security, and scalability of applications.
• Collaborate with frontend developers, QA, and DevOps teams.
• Write clean, reusable, and efficient code.
• Participate in code reviews and technical discussions.

Required Skills :

• Strong expertise in Node.js and JavaScript.
• Experience with Express.js or similar frameworks.
• Knowledge of Microservices architecture.
• Hands-on experience with MongoDB / SQL databases.
• Experience with Git and CI/CD processes.
• Good understanding of cloud platforms (AWS preferred).
• Strong debugging and optimization skills.

Preferred Skills :

• Experience with Docker / Kubernetes.
• Knowledge of Redis, Kafka, or message queues.
• Understanding of Agile methodologies.

Job Description: Senior Node.js Backend Developer

Role Overview :

We are seeking an exceptionally skilled and results-oriented Senior Node.js Backend Developer to architect and develop the core platform for our next-generation, mobile-centric platform. This role demands deep expertise in building highly concurrent, asynchronous, and distributed systems designed for massive scalability and ultra-low latency. You will be instrumental in delivering a system that can reliably support millions of users and high-velocity data flow, designed for a cloud-agnostic architecture from inception.

Key Responsibilities

● High-Concurrency Development: Design and implement highly performant and resilient backend services using Node.js (TypeScript/JavaScript), leveraging its asynchronous nature to manage persistent connections and high throughput efficiently.

● Microservices & APIs: Lead the development and maintenance of microservices, focusing on defining and implementing secure, robust, and highly optimized APIs (REST/gRPC) for mobile clients.

● Real-Time Data Flow: Architect and implement real-time, bi-directional data synchronization mechanisms (e.g., WebSockets, dedicated streaming protocols) necessary for instantaneous information delivery across the platform.

● Data Modeling & Persistence: Collaborate on and execute data modeling strategies, integrating with high-volume, low-latency databases (e.g., Cassandra, ScyllaDB, Aerospike) optimized for extremely fast reads and writes.

● Optimization & Tuning: Proactively identify and resolve performance bottlenecks within the Node.js runtime, event loop, and service interactions to ensure exceptional user experience under heavy load.

● Ability to perform Research / POCs & choose the suitable technology.

Required Technical Expertise (3-6 Years Experience Focus)

● Core Node.js & TypeScript: 3-6 years of hands-on, production experience in Node.js, with expertise in modern TypeScript/ES6+ development for large-scale applications.

● Asynchronous Programming Mastery: Deep understanding and practical experience with the Node.js event loop, non-blocking I/O, and advanced asynchronous patterns (Promises, async/await) to maintain high concurrency.

● Distributed Systems & Microservices: Proven experience architecting and operating services within a distributed system/microservices environment, including deployment using Docker and Kubernetes.

● Messaging & Real-Time: Expert knowledge of and implementation experience with message queuing systems like Apache Kafka for event sourcing, and protocols (e.g., WebSockets) for real-time data sync.

● Database Expertise: Deep practical experience working with, tuning, and optimizing at least one NoSQL distributed database (e.g., Cassandra, ScyllaDB, or Aerospike) for extreme performance and horizontal scalability.

● Caching & Statelessness: Expertise in implementing various caching strategies using tools like Redis or Memcached to ensure service statelessness and reduce database load.

Scalability & Performance Expectations

● High Throughput: Services must be capable of processing extremely high volumes of data transactions and managing millions of concurrent connections without degradation in service quality.

● Latency Goal: Achieve and maintain a P95 latency of less than 100 milliseconds for all core, user-facing data operations.

● Cloud-Agnostic Design: Experience designing and implementing services that are abstracted from specific cloud provider dependencies, demonstrating familiarity with cloud-agnostic practices for deployment across AWS, GCP, or Azure.

● Observability: Strong experience leveraging modern observability tools (e.g., Prometheus, Grafana, Jaeger) to monitor, trace, and debug complex, asynchronous, and distributed Node.js applications in production.

Startup Mindset & Delivery Goals

● Extreme Ownership: Demonstrate the ability to take full technical ownership of complex modules, driving them from architectural concept through to stable, optimized production deployment.

● Agility: Possess the adaptability and technical versatility required to thrive in a fast-moving startup environment with continuous deployment and rapid feature iteration.

Job Responsibilities:

1. Collaborate with other senior engineers, and management, to achieve optimal application architecture and design
2. Develop efficient, secure applications, peer-review code, and document solutions within an agile-blended software environment
3. Communicate proactively with team members, infrastructure, security, and quality assurance to continuously improve processes and engineering excellence
4. Guide and train other developers in backend technology
5. Ability to work independently and as a member of a team spread over different time zones

Skills:

1. Understanding of object oriented programming skills and data structures
2. At least 6 years of hands-on development in Java, Springboot & Hibernate
3. Should have experience in Java Multithreading, microservices
4. Experience with developing web applications
5. Expertise with in Core Java (Collections, Exception handling)
6. Experience with J2ee( Servlets, JSPs)
7. Experience with all well known database technology and object-relational mapping, experience with databases (Mysql, Mssql)
8. Knowledge and development background in web-services/REST, AJAX, JSON, and XML
9. Experience with Windows and Linux based environments
10. Experience with Maven and GIT tools
11. Understanding of UI technologies (HTML, CSS, Javascript libraries) would be a plus
12. Good to have – AWS experience and Fintech domain experience
13. Awareness of Jenkins will be a value add

About us:
Equal parts creative agency, engineering firm, and consultancy, Grappus has a reputation of doing things differently. We work with brands big and small, far and wide, helping them understand, prototype and deploy a broad range of custom tech. We value design and we cringe at bad UX. Each project is a clean slate, we don’t have frameworks, or any pre-made formulas. We’re not here to just grow big, make money and win awards. We’re here to crack the process of building truly innovative products from scratch. Products that make people say ‘damn’.

People at Grappus usually experience a highly accelerated career growth well beyond the narrow constraints of their ‘job description’. Here, the growth ladder is tailored to you. It operates exactly as fast as you can manage to grow. We think it's a waste when smart people are unable to make an impact. Our aim is to unleash your potential by giving you massive challenges and the freedom to solve them.

We’re in a fluid world, where we don’t know what technologies we’ll use next, or the projects we’ll work on. We’re actively searching for ways to shine a light on our blind spots, whether it is in the products we want to build, the problems we like to solve, or the company culture we try to create. That’s what makes life at Grappus so exciting. Grappus is an ongoing experiment and you are a part of it. We'll be a different company a few years from now because you are going to change it for the better. We can’t wait to see where you take us.

About the role:
We are seeking a Senior Backend Developer who has a knack for coming up with creative solutions to unique problems, planning development cycles and writing technical documentation while leading a team of developers. You should have experience with different design pattern implementation and be quick in making architectural decisions. You can get in where needed to write clean, reusable, and performant code, with creative sensibilities to push projects towards perfection. You should have good time management skills and be able to work both autonomously and collaboratively with a cross-discipline team of product managers, strategists, UX designers, art directors, and developers.

What we’d like to see:
● Ability to write elegant and readable code
● Excellent problem solving skills and love technical challenges
● Comfortable working in a team-oriented and collaborative environment
● Strong understanding of Agile and Lean software development processes and practices
● Stays plugged into emerging technologies/industry trends and applies them proactively
● Taking leads on projects as needed
● Knowledge of software best practices, like test driven development and continuous integration
● Directing the development team in the design, development, coding, testing and debugging of applications

Must have:
● BE/ BTech in Computer Science or a related field or equivalent practical experience
● 4+ years of professional backend development experience
● Experience coaching and mentoring junior developers
● Aggressive problem diagnosis and creative problem solving skills and client handling      skills
● Ability to work and thrive in a fast-paced environment, learn rapidly and master diverse web technologies and techniques
● Experience working with Python/Django or NodeJS
● Knowledge of DRF, Redis, Celery, RabbitMQ, Jenkins, MongoDB and PostgreSQL
● Implemented CI/CD in any of the projects done
● Strong understanding of the full web technology stack (i.e. HTTP, caching, headers, cookies, etc)
● Proficiency in working with API’s and third party integrations
● Demonstrated ability to learn new technologies
● Experience with multi-tenant architectures (SaaS)
● Experience with Test Driven Development
● Excellent project and time management skills

Nice to have:
● Familiarity and experience using a variety of architectural Design Patterns
● Knowledge of Kubernetes/Docker and Devops
● Personal projects or contributions to the open source community
● Strong organizational skills to juggle multiple tasks within the constraints of timelines
● Team player (those great personality types that people love to work with)
● Great communication skills

Why you’ll love it here:
(Besides working with our team with infinite charm)

● We have no fixed work timings or leave policy, you can take unlimited leaves and start your day whenever you want. (Just make sure others in your team don’t suffer)
● We don’t track these hours you put in or ask you to fill time sheets. We don’t believe in
micromanaging, if you’re struggling, ask for help. If someone else is, offer some support.
● We never mind if people make mistakes or screw up in any way, and offer full encouragement to help people learn fast by failing fast.
● We always encourage people to be completely candid, raise alarms, or log complaints
anonymously in our feedback tool, no matter how harsh.
● We are a ‘Work from Anywhere’ company, since passionate, driven people can work from
anywhere they want; their homes, or cafes, or mountains, or beaches, anywhere.
● We have a 15-day notice period. We want to build a place where people work willingly and passionately.

• Strong knowledge of the Go programming language
• Knowledge of common Go-routine and channel patterns
• Router packages, such as Gorilla Mux
• Development experience in embedded systems and Linux OS environments.
• Have expertise in implementing micro-services (using tools and technologies for messaging, RPC, containerization, etc.), Docker, container, Docker-swarm, Kubernetes, and Helm.
• Cloud-native architecture, Virtualization, Orchestration, VNFM, MANO, VIM (Virtualization Infrastructure Management).
• LCM (Life Cycle Management of microservices and VMs) - Monitoring, Resiliency, High Availability (HA) & Scalability
• Primary Skills: Golang
• Secondary Skill: Microservices
  
  
  
  

Talent Acquisition
Sakshi Kulkarni
Website: velankanigroup.com

43, Hosur Rd, Electronics City Phase 1,

Electronic City, Bengaluru, Karnataka 560100

• Experience in designing and developing applications using Node.js, RDBMS (preferably MySQL).
• Minimum 3 years of Node.Js, 3 years of Database experience required.
• Expertise in at least one of AWS, Google Compute platforms to build scalable solutions.
• Deep knowledge and experience in building complex cloud/enterprise-grade software in the area of IT infrastructure, virtualization, network, storage systems monitoring & manage mentor cloud solutions
• Expertise in writing async code (callbacks, promises, async/await, observables) and publish/ subscribe/ event.
• Experience in implementing and consuming SOAP and REST web APIs.
• Producing and maintaining automated testing, build, and deployment processes.
• Improve documentation of processes and systems
• Troubleshoot existing systems and applications
• Experience in data structure libraries (e.g., Immutable.js)
• Experience in RESTful APIs and knowledge of modern authorization mechanisms, such as JSON Web Token
• Understanding of data structures and problem-solving approaches, and ability to articulate trade-offs
• Strong fundamentals OOPS concepts, SOLID principles, Data Structures/Algorithms, Exception Handling, Coding Standards, Logging
• Passionate about writing clean, modular and unit testable code
• Possesses strong verbal and written communication skills.
• Experience with Agile development
• Good knowledge of Jenkins, SonarQube, Git.
• Proven problem solving skills including debugging skills, allowing you to determine source of issues in unfamiliar code or systems and the ability to recognize and solve repetitive problems rather than working around them.
• Collaborating with software engineers, QA engineers, UX and Design team and project managers