Backend Engineer

Role Summary 

We have an existing Android-based POS application that needs to be migrated and rebuilt as a Windows desktop application using WPF. You will re-architect the Android app's features, UI flows, and business logic into a full-featured WPF application with SQLite local storage, EF Core, and existing REST API integration. 

Responsibilities 

• Analyze the existing Android POS app and re-architect it as a WPF desktop application. 
• Rebuild all screens and workflows (billing, cart, product catalog, orders, reports) in WPF / XAML following MVVM pattern. 
• Implement local data storage using SQLite + Entity Framework Core (Code First, migrations). 
• Integrate with the existing backend REST APIs (same APIs used by Android app) for product sync, orders, payments, and authentication. 
• Ensure feature parity between Android and Windows versions. 
• Integrate Windows-specific hardware — barcode scanners, receipt printers, cash drawers. 
• Apply Dependency Injection, async/await, and SOLID principles throughout. 

Required Skills 

• WPF, XAML, MVVM, C# (.NET 6/8),
• Entity Framework Core + SQLite 
• REST API consumption (HttpClient, JWT auth, JSON handling) 
• Ability to read and understand Android (Java/Kotlin) code and translate logic to C# 
• Git, Visual Studio 

Good to Have 

• Prior Android-to-Windows or mobile-to-desktop migration experience 
• Payment gateway integration (Razorpay / Stripe / Paytm) 
• PDF / receipt generation (RDLC / FastReport) 
• POS, billing, or retail domain experience 

AI-Assisted Development (Mandatory Mindset) 

We expect the candidate to actively leverage AI tools to accelerate the migration and development process: 

• Use GitHub Copilot / Cursor / Claude to convert Android (Java/Kotlin) logic to C# WPF code efficiently. 
• Use AI tools for boilerplate generation — ViewModels, EF Core models, API service classes, XAML layouts. 
• Leverage AI for code review, refactoring suggestions, and identifying platform-specific differences (Android vs Windows). 
• Use AI-assisted documentation and inline commenting to maintain code clarity during migration. 
• Comfortable evaluating, validating, and refining AI-generated code — not just accepting output blindly. 

Qualification 

• B.E. / B.Tech / MCA in Computer Science
• 2–4 years WPF desktop development experience

Regards,

HR Team,

OnePOS Retail Solutions Private Limited

Must Have Skills:

1.      Experience with the .NET framework and .NET Core technologies: C#

2.      Writing and consuming REST API/Web API in .Net framework, .Net Core

3.      Must have excellent knowledge in Azure hosting services

4.      Good knowledge of Trouble shooting, Azure Hosting, maintaining and performance tuning

5.      Knowledge of Frontend framework (React), If not then Angular, or Vuejs etc

6.      Excellent Aptitude, Attitude and Communication Skills

7.      Strong understanding of OOPS Concepts

8.      Strong knowledge of Unit Testing

9.      Excellent knowledge and working experience in Microservice Architecture

10.  RDBMS Concepts, MS-SQL Server

11.  Writing & Optimizing SQL Queries for best performance

12.  Able to manage release by mean of CI/CD pipeline to deploy applications in Azure

13.  Well versed of code review and code scanning tools

Good to have Skills:

1.      Knowledge of HTML, Bootstrap, CSS, Responsive Design

2.      Entity Framework/LINQ, MVC

3.      Strong understanding of current design patterns & best practices

4.      Knowledge of Agile methodology and JIRA

5.      Knowledge of Electron is a plus

Key Responsibilities:

1.      Work with Scrum Team to prioritize tasks and ensure deadlines are met

2.      Communicate and actively participate in client call and understand requirements

3.      Convert design and architecture to code using best practices

4.      Provide expert level knowledge and guidance on modern software engineering techniques and methodologies for code reviews

5.      Demonstrate expertise in a variety of software concepts (object-oriented design), practices (design patterns), and procedures (troubleshooting defects)

6.   Able to troubleshoot and debug the code, write code with best coding practice and perform unit & Integration testing

7.      Collaborate with the technical team to build and migrate applications in Azure

8.      Test and update application so that it can be used for cross web browsers

9.      Use and set-up CI/CD pipeline

Experience Required: 5 -10 yrs.

Job location: Sec-62, Noida

Work from office (Hybrid)

Development Platform: Backend Development- Java/J2EE, Struts, Spring, MySQL, OWASP

Job Brief:

Requirements:

·      5+ years of experience in developing distributed, multi-tier enterprise applications, APIs.

·      Fully participated in several major product development cycles.

·      Solid background in design, OOP, object, and data modelling.

·      Deep working knowledge of Java, Struts,Spring, Relational Database.

·      Experience in design and implementation of service interface and public APIs.

·      Actively involved/writing codes in current project.

·      Development knowledge and experience of working with AWS, Azure etc. will be an added plus.

·      Clear Understanding and Hands on experience on OWASP Top 10 Vulnerability standards like XSS, CSRF, SQL injection, session hijacking, and authorization bypass vulnerabilities.

·      Find and resolve the security concerns on the product/application.

·      Good Documentation, reporting, Strong communication, and collaboration skills with various levels of executives from top management to technical team members across the organization.

·      Strong self-starter who can operate independently.

Responsibilities:

• Must have hands-on working experience in NodeJS with Typescript
• Must have experience of large size product development process
• Must have detailed knowledge of designing and developing performant REST APIs 
• Must have hands-on experience on Postgres DB and MongoDb / any NoSQL DB 
• Must be comfortable working with git and CI CD pipelines and deployment strategies
• Should be able to build a new team and work with your engineers and mentor them
• 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
• Continuously discover, evaluate, and implement new technologies to maximise development efficiency
• Should be open to learn new domain and work in fast paced environment 
• Responsible to deliver end to end module/product/project scope

Requirements:

• 4+ years of experience as a Full Stack Developer with a strong focus on Nodejs with TypeScript and React JavaScript
• Solid understanding of web application architecture, including RESTful API design and development
• Experience with front-end development using tailwind , bootstrap ,HTML, CSS, and JavaScript, typescript
• Strong analytical and problem-solving skills
• Excellent communication and interpersonal skills

• Design and develop innovative, company impacting products and services to support infrastructure operations
• Design, develop and implement object-oriented PHP applications from prototype through implementation
• Integrate open source and commercial enterprise applications into an exposed API and web-based portal
• Create highly scalable and performant REST/SOAP web services
• Keep focus on end users and goals all through the development process
• Work closely with product management and stakeholders to ensure applications meet needs and expectations
• Adhere to the highest levels of technical discipline and excellence to set a standard for the larger development organization

Requirements

• Bachelor's Degree in Computer Science, related field, or comparable extra work experience
• Solid experience with SQL and relation databases
• Solid experience with Object Oriented Design and Development
• Experience Developing API Interfaces
• Experience with version control systems, preferably Git

Beneficial Skills

• Experience with non-relational data stores such as ZooKeeper or Memcache

How would you leverage your technical expertise to create extraordinary impact for our clients?

ThoughtWorks is a global software consultancy with an aim to create a positive impact on the world through technology. Our community of technologists thinks disruptively to deliver pragmatic solutions for our clients' most complex challenges. We are curious minds who come together as collaborative and inclusive teams to push boundaries, free to be ourselves and make our mark in tech.

Our developers have been contributing code to major organizations and open source projects for over 25 years. They’ve also been writing books, speaking at conferences and helping push software development forward, changing companies and even industries along the way. 

You could influence the digital strategy of a retail giant, build a bold new mobile application for a bank or redesign platforms using event sourcing and intelligent data pipelines. You will use the latest Lean and Agile thinking, create pragmatic solutions to solve mission-critical problems and challenge yourself every day.

For a team to thrive, it needs active collaboration and room for healthy, respectful debate. Senior Developers are the technologists who cultivate this environment while driving teams toward delivering on an ambitious tech vision and acting as mentors for more junior-level consultants. They leverage their deep technical knowledge to solve more complex business problems and actively assess their team’s health, code quality and nonfunctional pipelines. 

You’ll spend time on the following:

• You will use continuous delivery practices to deliver high-quality software as well as value to end customers as early as possible.
• You will work in collaborative, value-driven teams to build innovative customer experiences for our clients
• Create large-scale distributed systems out of microservices
• You will apply the latest technology thinking from our tech radar to solve client problems
• Efficiently utilize DevOps tools and practices to build and deploy software
• You will lead or take part in the entire cycle of software consulting and delivery from ideation to deployment and everything in between
• You will act as a mentor for less-experienced peers through both your technical knowledge and leadership skills 

Here’s what we’re looking for:

• You have at least 5 years of experience with two or more development languages such as Java, C#, or Ruby
• You can skillfully write high-quality, well-tested code and you are comfortable with Object-Oriented programming
• Presence in the external tech community: you proactively share your expertise with others via speaking engagements, contributions to open source, blogs and more
• Comfortability with Agile methods, such as Extreme Programming (XP), Scrum and/or Kanban
• You enjoy influencing others and always advocate for technical excellence while being open to change when needed 
• You’re willing and able to commit to travel to client sites in order to solve their business problems
• You’re resilient in ambiguous situations and can approach challenges from multiple perspectives
• Bonus points if you have working knowledge of cloud technology such as AWS, Azure, Kubernetes and Docker