Sr. Frontend Developer (Javascript)

About the Role

We are looking for a Senior Web Engineer to architect and build the entire web experience using Next.js and

React — a consumer-facing trading app with real-time data, SEO-optimised public pages, and internal admin

tooling. What We’re Looking For

You have built production web applications from zero to launch using Next.js. You are comfortable across the

full web stack — SSR/SSG, real-time WebSocket handling, responsive design, and performance optimization.

Ideally, you have worked on trading platforms, dashboards, or data-rich fintech products. You take ownership of

your codebase, care about developer experience, and can work independently to deliver high-quality, production-ready code. What You’ll Do

• Architect and build the Next.js web platform from scratch — project structure, CI/CD, component library, and design system. • Build real-time, data-intensive interfaces — live price rendering, interactive charting, and responsive

dashboards. • Build SEO-optimised content pages and public-facing discovery surfaces. • Build internal admin and operations tooling — dashboards, data tables, configuration interfaces, and

monitoring views. • Define frontend engineering standards — component architecture, testing strategy, accessibility, and

performance budgets. • Own cross-browser compatibility, Core Web Vitals, and responsive design across devices. • Drive code reviews, mentor team members, and champion best practices across the web team. Must-Have

• 4+ years frontend engineering with React in production; 2+ years with Next.js specifically. • Strong TypeScript skills and experience with SSR, SSG, and incremental static regeneration. • Experience building real-time features with WebSockets in web applications. • Experience with Tailwind CSS or utility-first CSS frameworks. • Experience building both consumer-facing and internal admin/dashboard UIs. • Understanding of SEO best practices — structured data, meta tags, Core Web Vitals.

• Familiarity with CI/CD, CDN deployment, and web performance optimization. Nice-to-Have

• Prior experience building trading platforms, brokerage dashboards, or fintech web apps. • Experience with charting library embeds (TradingView, Lightweight Charts, Highcharts). • Experience building complex admin portals with advanced table views, filters, and real-time updates. • Familiarity with search integration (Typesense, Algolia). • Experience with accessibility standards (WCAG 2.1) and internationalization (i18n). Tech Stack

Framework Next.js 14+, React 18+

Language TypeScript

Styling Tailwind CSS, Headless UI / Radix

Real-time WebSocket, SWR / React Query

Charting Charting library embed, Recharts / D3

Admin TanStack Table, React Hook Form

Deployment Vercel / AWS CloudFront, CDN, Edge functions

Testing Jest, Playwright (E2E), Lighthouse CI

Front end Developer (Angular)

- You are your own master. We don't preach you, we just allow you to Innovate, Iterate, Learn and Adapt

- Work with one of India's leading fintech unicorn company

- ESOPs in the company

Requirements

- At least 3-12 years of Frontend development experience

- BE/BS in Computer Science, Management and Information Systems, or equivalent

- Problem Solver: Ability to formulate/implement technical solutions, proven ability to understand, analyze, and

solve issues with guidance.

- Should have executed a production level end to end UI application on his own

- A hands-on contributor who played an important role in implementing the proposed architecture and design

- Excellent command over HTML5, CSS,Javascript,Jquery,Ajax,MVVM. Proficient understanding of web markup.

- Expert Level proficiency of Bootstrap, Angular.js (Angular Latest version preferred), Framework.

- General Familiarity with Node.js, Ember.js, Can.js, React.js

- Proficient in unit test cases for UI applications functionality and flow testing using Jasmine/Karma Framework

- Good knowledge of caching and memory management for UI applications

- Exposure to data visualization libraries such as D3.js

Roles and Responsibilities

- Collaborate with cross-functional teams to define, design, and push new features and innovative front-end

solutions. Translate UI/UX design wireframes to actual code that will produce visual elements of the application.

- Continuously discovering, evaluating, and implementing new technologies to maximize development efficiency.

- Provide technical leadership towards new UI architectures.

- Unit-testing code for robustness, including edge cases, usability, and general reliability.

- Create and be accountable for user interaction models, workflows, information architecture, prototypes, and

guidelines for user interfaces.

- Work closely and collaborate with other members of the development teams to ensure smooth integration of the UI component with back end technologies

- Designing and building responsive web applications.

Job brief

We are looking for an experienced and passionate Front-end developer to join our IT team. You will be responsible for building the ‘client-side’ of our web applications. You should be able to translate our company and customer needs into functional and appealing interactive applications.

If you’re interested in creating a user-friendly environment by writing code and moving forward in your career, then this job is for you. We expect you to be a tech-savvy professional, who is curious about new digital technologies and aspires to combine usability with visual design.

Ultimately, you should be able to create a functional and attractive digital environment for our company, ensuring great user experience.

Skills Required:

• Must Have: HTML5, CSS3, Javascript, JSon, Bootstrap
• Good to Know: Photoshop, Illustrator, Indesign
• Good communication skills in English is mandatory

Requirements:

• 3 to 5 years full time experience as a Front End HTML Developer
• Hands on experience with mark-up languages
• Familiarity with browser testing and de-bugging
• In-depth understanding of the entire web development process (design, development and deployment)
• Understanding of layout aesthetics
• Knowledge of SEO principles
• An ability to perform well in a fast-paced environment
• Excellent analytical and multitasking skills
• BSc degree in Computer Science or relevant field

Responsibilities:

• Use markup languages like HTML to create user-friendly web pages
• Maintain and improve website
• Optimize applications for maximum speed
• Design mobile-based features
• Collaborate with back-end developers and web designers to improve usability
• Get feedback from, and build solutions for, users and customers
• Write functional requirement documents and guides
• Create quality mockups and prototypes
• Help back-end developers with coding and troubleshooting
• Ensure high quality graphic standards and brand consistency
• Stay up-to-date on emerging technologies

Shift Availability :

Monday to Friday : 2:15pm to 11:30pm | Alt Saturdays till 7:30pm

Drop facilities provided

Complete Work From Office ( Salt Lake - Sector 5)

CTC, Bonuses & Rewards: -

Salescom Services Private Limited is an equal opportunity employer in the local industry. Our operations and company visions are quite a niche and heavily focused on being massively successful operations engaged in next-generation sales & marketing wins, support, and information technology-enabled services & solutions. CTC for the right employee is not pre-defined as such however will be a best-fit match to the local industry

standards. Come, interview with us, figure out if we both are the right fit for each other, and the rest will follow suit.

• Experience with Web Components and Custom Elements
• Understanding of data visualization concepts and technologies (SVG, D3.js)
• Familiarity with JavaScript build tools such as Webpack.
• Git Source Control
• Unit and E2E Testing - Cypress.io / Chai / Karma / Jasmine / etc.
• Experience building responsive interfaces.
• Good sense for building visually appealing products.
• Some Node experience
• Experience using RESTful Web Service Architecture
• Experience working in Agile Environments
• To be considered for this role, you must have:
• A deep understanding of building complex, single-page JavaScript apps using frameworks such as Angular, React, or Vue
• Fluency with JavaScript, TypeScript, CSS and SASS

• In this Senior Front End Engineer position, you will:
• Inherit a well-architected, clean and robust codebase built with TypeScript, Angular, and SCSS/SASS with a modern interface
• Work with our design team and other engineers to make sure our application is performant and intuitive to use
• Evaluate and implement new libraries and components
• Ensure best practices are followed in the design and development of the application
• Contribute to and help manage our open source libraries

Job Type: Full-time

Salary Offer: 3L PA - 5.4L PA

Job Location: Remote for 6-12 months due to the pandemic, then Mumbai, Maharashtra

Required experience:

1-2 years and above experience in developing frontend UIs using HTML5, CSS, Javascript with ReactJS. Candidate must have experience with data binding and state management (Redux/MobX)

Key Skills required :

1. Proficiency in HTML5 development

2. Proficiency in CSS Frameworks like Bootstrap ⅘

3. Strong understanding of Javascript

4. Hands on experience in building and implementing UIs in ReactJs including experience in building components, observables, state management and data binding

5. Strong expertise in building Responsive Websites

6. Experience fixing performance issues using tools like GTMetrix and Pagespeed Insights

7. Working experience in maintaining code versioning by committing to Git repositories

KRAs includes :

1. Understanding the scope of work and arriving at timelines

2. Frontend UI development using Reactjs, HTML5, Javascript and CSS

3. Implementing media queries and following Responsive Web Design principles for responsive websites

4. Implementing state management, databinding and mocking APIs

5. Unit testing prepared web applications and HTML pages

6. Coordinating with the testers to resolve any bugs

7. Reporting on daily and weekly progress

8. Optimization and performance tuning of code

• 3 to 5 years of experience in UI Development and hands on experience on Angular2 or Angular 2+, Node etc.
• Exposure to cross browser compatibility issues, SCSS as the CSS macro-processor, sprites etc.
• Experience with Jira, SVN, Git will be added advantage
• Passionate and eager to learn new technologies
• Intimately knowledgeable about all things web and mobile
• Demo able portfolio on website or GitHub will be given preference
• Must have knowledge on Java script, jQuery, ECMAScript
• Strong proficiency in JavaScript (ES6) or TypeScript
• Familiarities with modern JavaScript tools, like npm and webpack
• Excellent technical design, problem solving and debugging skills.
• Experience building JavaScript/CSS Frameworks or shared component libraries used in large scale production websites.
• Understands frontend software design patterns (e.g. asynchronicity, data binding, modules, objects, promises).
• Knowledge of professional software engineering practices & best practices for the full software development life cycle, including coding standards, code reviews, source control management, build processes, testing, and operations.
• Working with MVVM, MVP, MVC patterns

Requirements

• Convert design to Angular 5 components
• Use SCSS as the CSS macroprocessor
• Integrate the Angular services with APIs from the backend team
• Implement UI development best practices to write optimized and non-buggy code
• Work in Agile environment with sprint releases ranging from 2 to 4 weeks
• Feasibility study of requirement and suggest multiple approaches for a problem after sufficient RnD
• Keep abreast with trending recent UI tools, technologies, plugins and software in the industry
• “Roll-up your sleeves” attitude to get things done
• Test your screens using a tool for all browsers and resolution compatibility
• Handle and track tasks assigned using Agile methodology
• Strong commitment towards quality and schedule.
• Cross team coordination