Senior Node.JS Developer

This Is NOT a Typical Java Role If your experience is mostly CRUD APIs, controller wiring, or shallow service layers — this role is not for you. We are looking for a top tier backend engineer who thrives on: 

* Designing complex algorithms 

* Building high-performance, memory-efficient systems 

* Owning deep backend logic that actually moves the needle 

You will work close to the core engine of the product, not the edges.

What You’ll Be Trusted With 

* Architect and build backend systems that must perform under load 

* Design and implement custom algorithms for real-world, non-trivial problems 

* Solve performance bottlenecks involving CPU, memory, I/O, and concurrency 

* Build backend services where latency, throughput, and correctness matter 

* Own document & PDF processing pipelines end-to-end:     

-Composition     

-Rendering     

-Optimization     

- High-volume generation 

* Make hard technical decisions and stand by them

Non-Negotiable Skills 

* Exceptional Java expertise (Core Java, Spring Boot, Java 8+) 

* Strong command over:     

• Data structures & algorithms 
• Multithreading & concurrency models     
• JVM internals & memory management 

* Proven experience building custom algorithms (this will be evaluated) 

* Deep backend engineering experience with Spring / Spring Boot 

* Strong understanding of:     

• API design principles     
• Fault tolerance & resilience     
•  Performance tuning & profiling 

* Ability to reason about time complexity, space complexity, and trade-offs 

* Strong database fundamentals (query optimization, indexing, transactions) 

* Experience with message brokers (ActiveMQ, Kafka, RabbitMQ) 

* Exposure to Kubernetes-based deployments or large-scale microservices 

Interview Focus (Be Prepared) 

* Algorithm design & problem solving 

* Deep Java fundamentals 

* System design discussions (backend-heavy) 

* Performance tuning scenarios 

* Real-world debugging and optimization challenges

About
we are building the next big thing in payments for Millennials. Payments are supposed to be simple, intuitive and fast, and we are ensuring that. As the indie creator economy grows, peer-to-peer payments and digital fulfilment will keep growing and a growing number of merchants are earning from direct payments for the digital creations. At Slash we are creating a platform for merchants to seamlessly connect and earn from their supporters and consumers, while also building a payment platform that Millennials will fall in love with.

Responsibilities

The platform that will drive payments at slash will be the social profiles and payment pages for the merchants. You will be responsible for building the social platform on which merchants can build their profiles, list items for sale, the APIs that power the entire UI experience for Slash.

• 3+ years of experience in NodeJS Backend development
• Good understanding of data structures, algorithms and system design
• Awareness of OOP paradigm, SOLID principles and design patterns
• Experience with TypeScript would be a bonus
• Experience with SQL and noSQL databases and ORMs like Sequelize and Mongoose
• Solid understanding of HTTP, Network principles, caching strategies
• Experience with authentication strategies like Oauth, JWT, passport.js
• Aptitude to work at early growing startup environment

Key Responsibilities:
● Node.js Developer responsible for managing the interchange of data between the server and the users.
● Your primary focus will be the development of all server-side logic, definition and maintenance of the central database, and ensuring high performance and responsiveness to requests from the front-end.
● You will also be responsible for integrating the front-end elements built by your co-workers into the application. Therefore, a basic understanding of front-end technologies is necessary as well.
● Strong proficiency with JavaScript
● Knowledge of Node.js core and frameworks Express, StrongLoop, koa, hapi etc
● Understanding the nature of asynchronous programming and its quirks and workarounds
● Good understanding of server-side templating languages
● Good understanding of server-side CSS preprocessors
● Basic understanding of front-end technologies, such as HTML5, and CSS3
● Understanding accessibility and security compliance
● Integration of multiple data sources and databases into one system
● Understanding fundamental design principles behind a scalable application
● Understanding differences between multiple delivery platforms, such as mobile vs. desktop, and optimizing output to match the specific platform
● Creating database schemas that represent and support business processes
● Implementing automated testing platforms and unit tests
● Proficient understanding of code versioning tools, such as Git.

Technical Skills:
● Expert knowledge of key Web technologies as HTML5, CSS3,
● Expert in JavaScript / AJAX, NodeJS, React.
● Expert knowledge of OO Analysis and Design,
● Expert on Design Patterns and Frameworks as NodeJS, React.
● Knowledge of Agile methodologies (Scrum).
Soft Skills:
● Self-motivation to work independently and strong work ethic.
● Ability to work in a team, and adapt to new and evolving processes.
● Flexibility and adaptable
● Deep experience with Agile