Dot Net Developer

Fountane Archipelago  ·  Island Role

A Little Bit About the Role

We are looking for a Senior Product Engineer (L3) who thrives in complexity. Most engineers build on blank canvases — you build on someone else’s mess and leave it better than you found it.

The majority of your work at L3 will be on existing, live codebases — disorganised, partially documented, built by multiple teams over multiple years. Your job is to enter those systems, understand them before touching them, extend and clean them without breaking what works, and progressively bring them up to a standard where AI tooling can accelerate further development. This is the core of what L3 does at Fountane. If you have only built greenfield projects, this role will be hard.

You are expected to be genuinely full stack: comfortable owning web applications and mobile apps, the frontend, backend, database, state management, and API integration layer — without needing to hand off to a specialist.

You will work closely with the Concept Engineer on your Island — translating their prototypes into production architecture, raising technical blockers early, and keeping the sprint honest. You will also review code, mentor junior engineers, respond to production incidents, and contribute to the network’s shared knowledge base.

All of this is done primarily with Cursor and Claude as your execution and reasoning tools. AI-assisted engineering is not a feature of this role — it is the method.

AI-First Engineering Expectation

Cursor and Claude are your primary tools — not supplements. Engineers at L3 who are not using AI at the codebase level are not operating at this level.

At L3, AI-assisted engineering means:

• Loading full codebase context into Cursor before writing a single line — understanding the system before touching it.
• Writing scoped, precise refactor prompts that isolate changes to one concern at a time.
• Using Cursor to generate tests that document existing behaviour before any restructuring begins.
• Using Claude for architecture reasoning, decision documentation, and translating CE briefs into structured technical plans.
• Producing inline documentation and decision records as part of the AI-assisted workflow — not as an afterthought.
• Sharing effective prompt patterns and Cursor discoveries with the broader Fountane network — kept to yourself, they are a missed contribution.

Key Responsibilities

Legacy Codebase Refactoring & the Cleaning Phase

This is the primary L3 engagement type at Fountane. You will be handed existing, partially documented codebases — built by previous teams, often without tests, with inconsistent patterns — and your job is to refactor them into a clean, AI-promptable state without losing existing functionality. You use Cursor’s codebase context window to navigate safely, write characterisation tests before touching anything, and make changes in small, reviewable increments. The standard is: every module you leave should be easier to extend by AI tooling than when you found it.

Full Stack Development — Web & Mobile

Build and own the full application layer: React / Next.js web frontends, React Native or Flutter mobile apps, Node.js / Python backends, and relational and non-relational databases. You should be able to pick up web or mobile on any engagement without needing a handoff. Schema design, data modelling, and state architecture are yours to own — including diagnosing and fixing broken or leaking state in existing frontends.

Third-Party API Integrations

Integrate complex third-party services — payments (Stripe), communications (Twilio), auth (Auth0), and others — reliably and without creating brittle dependencies. Own the integration layer end to end: error handling, retries, failure modes, and documentation. If a third-party integration is flaky in production, that is your problem to own.

CE Collaboration & Sprint Integrity

Work directly with the Concept Engineer to translate prototypes into buildable technical plans. Review CE briefs before the sprint starts — if the scope is technically unrealistic, the time to say so is before work begins, not on demo day. Raise blockers against acceptance criteria proactively. You are the technical check on what the CE promises the client.

Security Awareness

Write code that does not require the Lead to security-audit every line. This means: input validation by default, no hardcoded secrets, correct auth scoping, safe handling of user data, and awareness of common vulnerabilities (injection, broken auth, insecure direct object references) in the context of the stacks you work in. You are not the security architect — the Lead owns that — but you are expected to produce code that does not introduce obvious vulnerabilities.

Production Incident Response

When something breaks in production, you are on it. Diagnose the issue, apply a safe fix or rollback, document what happened and why, and hand a clear summary to the Lead for the client post-mortem. Speed matters, but a bad fix that causes a second incident is worse than a slow fix that is correct. Response expectation: acknowledged within 1 hour, resolved or escalated with a clear status within 4 hours.

Codebase Navigation & Safe Refactoring

On all engagements — not just Cleaning Phase work — keep changes small, focused, and reviewable. One type of change per commit. Write tests that document existing behaviour before restructuring. Leave every module easier to understand than when you found it.

Code Review

Review pull requests from L1 and L2 engineers with specific, actionable feedback — not rubber-stamp approvals. A good code review at L3 leaves the author understanding what to do differently next time, not just what to fix now. Review weekly; do not let PRs age.

Mentoring

Review junior engineers’ code weekly with specific, useful feedback — this is distinct from quality-gate code review. The goal here is teaching, not gatekeeping. Run monthly pairing sessions to help them grow. The measure of good mentoring is whether they are becoming more capable and less dependent on you over time.

Documentation

Write short decision records when you make significant technical choices. Leave every module you touch easier to understand than when you found it. Treat documentation as part of the engineering work, not a separate task you do at the end.

Qualifications

• 5+ years of experience as a software engineer, with a strong track record on real production codebases you did not build from scratch — incomplete documentation, inconsistent patterns, other people’s decisions. If your experience is primarily greenfield, this role will be a difficult fit.
• Genuinely full stack across web and mobile: proficient in React / Next.js and at least one of React Native or Flutter, Node.js or Python on the backend, and comfortable with both relational and non-relational databases including schema design.
• Hands-on, daily Cursor and Claude usage at the codebase level. You should be able to describe concretely how you use AI in your engineering workflow — not in general terms.
• Experience integrating complex third-party APIs in production environments — not just following a quickstart guide. You should be able to describe an integration that failed in production and what you did about it.
• Solid security awareness for the stacks you work in: input validation, auth scoping, safe data handling. You do not need a security specialism, but you should not be writing code that introduces obvious vulnerabilities.
• Has conducted meaningful code reviews that improved the code and the author, not just approved the PR.
• Has coached or mentored junior engineers before, and done it well.
• Comfortable with production incident response — diagnosing issues under pressure, applying safe fixes, and communicating clearly to a Lead or client about what happened.
• Treats documentation as part of the job, not an afterthought.
• Bachelor’s or Master’s in Computer Science or a related field, or equivalent experience.

About Fountane

Fountane is a technology ventures lab - one part product studio, one part startup engine. We build high-quality software and AI products for clients ranging from fast-moving startups to large enterprises, and we co-build and invest in new companies when we see the right opportunity.

Founded in 2017 and headquartered in Minneapolis, we have grown to 60+ people across four continents and were recognised as one of America’s fastest-growing companies, ranking No. 699 on the Inc. 5000 with 595% three-year growth.

We are radically open-minded, serious about craft, and direct about expectations. If you want to do meaningful work without politics, this is the place.

Job Title: .NET Developer (Full Stack Preferred)

Experience: 4–5 Years

Location: Indore (Preferred)

Job Type: Full-Time

Job Summary:

We are seeking a skilled and experienced .NET Developer with 4–5 years of hands-on experience in Core .NET, MVC, and Entity Framework. The ideal candidate will be proficient in either Angular or React, with full stack development experience being an added advantage. Candidates from Indore or those willing to relocate are preferred.

The .NET Developer will be responsible for designing, developing, testing, and maintaining software applications based on the Microsoft .NET framework. You will collaborate with cross-functional teams to deliver high-quality solutions and contribute to all phases of the software development life cycle.

Responsibilities/Duties:

1. Software Development:

Design, code, test, and debug software applications using the .NET framework.

Collaborate with other developers and team members to deliver robust and scalable solutions.

2. System Analysis:

Analyze and understand business requirements to design efficient and scalable software solutions.

Conduct code reviews and provide constructive feedback to peers.

3. Application Maintenance:

Maintain and enhance existing applications by resolving issues and implementing new features.

Troubleshoot and debug software defects and performance issues.

4. Documentation:

Document code, technical specifications, and system architecture.

Prepare and maintain relevant project documentation.

5. Collaboration:

Work closely with product owners, business analysts, and QA teams to ensure software meets business goals and quality standards.

Collaborate with other developers on team projects and shared codebases.

6. Technology Stack:

Utilize Microsoft technologies, including C#, ASP.NET, MVC, Entity Framework, and SQL Server.

Qualifications/Requirements:

Education:

Bachelor’s degree in Computer Science, Software Engineering, or a related field.

Experience:

• 4–5 years of professional experience in .NET development.
• Experience with GitHub Copilot is a plus.

Skills:

• Proficient in C#, ASP.NET, MVC, and Entity Framework.
• Experience with either Angular or React.
• Strong understanding of object-oriented programming and design patterns.
• Familiarity with front-end technologies (HTML, CSS, JavaScript) is a plus.
• Comfortable with version control systems like Git.
• Excellent problem-solving and debugging skills.
• Strong verbal and written communication skills.

Preferred:

• Candidates based in Indore or willing to relocate.
• Experience working in Agile/Scrum environments.
• Full stack development experience is highly desirable.

Full Stack Developer

• The candidate should hold either MCA or BTech degree in Computer Science
• The candidate should have 4 to 10 years of IT Development hands on experience in integration solution using WCF/SOA technologies
• Build integration solutions to automate business processes related to Oil & Gas Refinery business
• Should have excellent knowledge in C#, WCF, SOAP/REST API,, OOPS Concepts, Object Oriented design principles and Design Patterns
• Should have excellent knowledge in SQL Database Design, RDBMS concepts and Master Data Services
• Should have good knowledge in Authentication, Security, XSD and System Integration concepts
• Should be able to understand the Business Requirement and convert it into Technical design document
• Communicate with internal and external customers, supervisors and management using clear, user-friendly terminology
• The candidate should have good Arithmetic reasoning, Logical and Analytical thinking
• Should be Flexible to learn new things, Self-motivated and take up any development role assigned, irrespective of the technology

Must have skills - sql, .net , c# , wcf 

• Hands-on expertise in managing technical teams and work closely with business stakeholders
• Should be familiar with card testing and POS ecosystem.
• Experience with designing APIs and building platform integrations in Commerce, POS, FinTech and Payments
• Payment’s domain experience.
• Extensive experience on Base24 & SWITCH part for payment format.
• Exposure on ISO8583 Messaging system.
• API understanding and creation.
• Working knowledge on cryptographic algorithms (RSA, EC, AES, SHA variants), TLS/SSL protocols. C Symetric and A symetrics, K.M.S.
• Digital Payments technical knowledge - QR/ POS/ UPI/ BQR
• Understanding of CI/CD pipelines, Kubernetes, containerization, Docker
• Must have strong technical skills in Android APK and iOS development Concept and Web services.
• Supportability, monitoring, ops in general.
• Accurate cost models to deploy and operate
• Extensive experience in TLOG’s, data integration with downstream applications, and impact of POS changes on different financial, legal, compliance, loss prevention, etc. applications.
• Extensive experience with payment systems 7861 (EMV, payment middleware, encryption, tokenization, settlement, offline scenarios,).
• Extensive experience with different types of payment methods including credit, debit, gift cards (Both closed loop and open loop), PLCC, PayPal, AliPay, checks, etc. as well as different payment form factors like Tap N Go, contactless, swipe, EMV, Mobile, etc.
• Extensive experience with payment devices (pin pads, printers, registers, scanners).
• Experience in Node.js / Java / Python, building REST APIs, with experience/exposure to front end stack like JavaScript & React / Angular. 
• Experience with Storage systems - RDBMS, NoSQL (Cassandra/MongoDB), Redis/Memcache/Aerospike.
• Experience in messaging tools like Kafka/AWS Kinesis etc...
• Design expertise for performance, scalability, fault tolerance and high availability

• Experience with POS systems and Payments domain.
• Demonstrated experience for systems architecture, design, and integration for POS systems
• Java and/or Node.js. Experience building micro services (REST APIs) using Node.js
• Experience with one or more RDBMS databases like MySql, PostGreSQL
• Experience with one or more NoSQL databses like MongoDB, Cassandra, DynamoDB, Aerospike, Elastic Search, Redis, neo4j etc.,
• Caching technologies like: Redis, Elasticache,
• Cloud Providers like: AWS/ Google Cloud / Azure
• CI / CD : Jenkins, Docker, Kubernete
  

● In-depth knowledge of full-stack development principles and best practices.

● Expertise in building web applications with strong proficiency in languages like Node.js, React, and Go. 

● Experience developing and consuming RESTful and gRPC API Protocols.

● Familiarity with CI/CD workflows and DevOps processes. 

● Solid understanding of cloud platforms and container orchestration technologies.

● Experience with Kubernetes deployment and workflows using tools like Argo.

● Experience applying AI/ML models to optimize workflows or enhance product features, with familiarity in frameworks like TensorFlow, MLflow, Kubeflow, or PyTorch. 

● Experience fine-tuning existing AI/ML models to adapt to specific use cases or datasets, ensuring optimized performance. 

● Experience with Workflow Orchestration tools like Temporal and Windmill.

● Strong background in System Design. 

● Hands-on experience with Queuing Mechanisms such as RabbitMQ, Redis, and Kafka. 

● Experience with designing and building user-friendly interfaces using Tailwind CSS and Radix UI. 

● Excellent understanding of distributed systems, databases, and APIs. ● A passion for writing clean, maintainable, and well-documented code. ● Strong problem-solving skills and the ability to work independently as well as collaboratively. 

● Excellent communication and interpersonal skills. 

Bonus points if you have: 

● Experience with building self-serve platforms or user onboarding experiences.

● Familiarity with Infrastructure as Code (IaC) tools like Terraform.

● A strong understanding of security best practices for Kubernetes deployments.

● Grasp on setting up Network Architecture for distributed systems. 

At CEDCOSS, we're all about you.

CEDCOSS is more about experiencing than talking. It was founded and is still standing on the principle of putting employees first. Discover, create, learn, explore, and be amazed daily. As a team of like-minded individuals with different beliefs, our company is dynamic.

Established in 2010, we have implemented hundreds of eCommerce sites across a variety of platforms. A particular focus is on eCommerce startups and mid-market companies. Our clients range from Fortune 500 companies as well as small businesses.

Are you ready to create connections that become lasting relationships?

Listen, Learn and Make a Match with CEDCOSS!

You should have

● 5 - 8 years of professional experience in Node.js

● Strong Knowledge of Node.js and frameworks - Express.js

● Hands-on experience in creating, designing and using RESTful API

● Experience in the development of large-scale SaaS and cloud-native applications

● 5 years of professional experience building Node.js backend applications

● Proficient in any databases such as MySQL, MongoDB, etc.

● Hands-on Experience in Test Drive Development (TDD)

● Strong knowledge of JavaScript libraries and frameworks such as ReactJS

● Understanding of Agile methodologies and experience working in sprints

● Ability to understand business requirements and translate them into technical requirements

● Knowledge of E–Commerce Integration is Good to have.

● Experience in AWS, CI/CD tools, SVN, Git and Bitbucket is good to have.

What you will Do

● Developing high-performance applications by writing testable, reusable, and efficient code.

● Implementing effective security protocols, data protection measures, and storage solutions.

● Troubleshooting and resolution of technical problems and issues, on web applications in a production environment.

● Ensuring that best practices are followed in the design, development, coding, testing, and debugging of software.

● Developing and maintaining eCommerce platforms/web applications and existing online selling channels and affiliates.

● Previous Experience or relevant exposure in the E-commerce industry and understanding of e-commerce business model.

● Overall Understanding of web development lifecycle including frontend and backend using modern frameworks.

● Strong understanding of data structures, DB schemas, troubleshooting and DB optimization.

● You will have to collaborate with Product Management and Implementation teams and build a commercially successful product

Here's what we believe in

● Empathy, addressing the ability to be humane.

● Humility brings us, future leaders.

● Organizational Ethics demonstrates expertise on subject matters with on-job experience.

● Quality of Work ensuring to deploy and deliver of exceptional outcomes

● Attention to details

● Multitasking capabilities to meet set deadlines and schedules

What benefits can we offer?

● Bi-Yearly performance audits and appraisals

● The flexibility of working days/hours

● Recognition and Appreciation

● A plethora of industry exposure and self-growth opportunities

Become part of a team that thrives on challenging, rewarding, safe, and safe work environments

Full Stack Web Developer

Job Location: Bengaluru

Job Type: Full Time.

Education:

Bachelors in Computer science/Information or any related stream with desired work experience.

Overview:

We are looking for a talented Full Stack Web Developer to create amazing user interface based web application with clean and artful web design skills. The engineer would be responsible for architecting, designing, developing and deploying scalable web application. We are building a strong and dedicated team focusing on developing web application for multiple client requirements and in-house projects.

Roles & Responsibility:

1. Write high performance, clean, scalable and quality web applications under given timelines.

2. Architecting, designing and deploying web application for various cloud platforms like AWS, Azure, GCP.

3. Identifying bottlenecks, bugs and devise solutions for these problems.

4. Responsible for both front-end and back-end development.

5. Participate in requirement analysis, documentation with business partners.

6. A standout colleague but should be able to work independently too.

Requirements:

1. 1-2 years of work experience as Full Stack Web developer.

2. Experience in web application development with exposure to both frontend and backend development.

3. Ability to produce well documented code with excellent debugging capabilities.

4. Strong Communication skills

5. Expert in any of the following programming languages Java, JavaScript(NodeJs), Python.

6. Experience in web development frameworks like Django, Flask.

7. Experience with front end technologies HTML5, CSS, Angular, React Js.

8. Experience in developing and integrating REST, SOAP APIs.

9. Familiarity with databases like MySQL, MongoDB etc.

10. Familiarity with web servers Apache, Ngnix etc.

11. Good understanding of OOPs and Web design patterns.

12. Willing to learn and implement latest technologies.

Bonus:

1. Good knowledge of revision control tools such as Git, Bit Bucket, Source tree

2. Experience in using multiple IDE and different application development frameworks.

3. Experience in mobile application development is added advantage

4. Industry level certification on web application development and design or cloud platform would be much appreciated.