Full-Stack Product Engineer

Wonkrew; Chennai District; On-site; INR 1,200,000 - 1,800,000; Full time

Job summary

Wonkrew in Chennai is seeking a versatile full-stack developer to build complete applications across UI, API, data model and deployment. You will ship end-to-end features for live systems used on construction sites and new tooling from scratch.

We currently use Node, TypeScript, Next.js, React Native and PostgreSQL, with some legacy PHP/MySQL. You will learn quickly, communicate clearly, and design for security and performance in a rapidly evolving stack.

Qualifications

• 2 to 5 years building and shipping web applications.
• Genuine full-stack range: you have built interfaces and the backend behind them.
• Strong knowledge of relational data modelling, API design and query performance.
• Working knowledge of how applications get broken: injection, XSS, insecure file handling, broken access control, and how to prevent each.
• Comfort with Git in a team workflow.
• The ability to read unfamiliar code and reason about it before touching it.
• Clear written English. You will write specs, READMEs, status updates and prompts, and the quality of all four affects the output.

Responsibilities

• Design and build features end to end: interface, API, data model, deployment.
• Take a loose problem statement and turn it into something that works and can be shipped.
• Make product judgement calls on small things without waiting to be told.
• Keep existing systems running and growing.
• Take on applications already in production, including code written by other people with no documentation.
• Understand how a system behaves before changing it, then change it without breaking anything.
• Debug production issues down to root cause rather than patching the symptom.
• Find and fix security and performance problems in inherited code, in order of what actually matters.
• Work in an AI-assisted workflow.
• Use AI coding tools as a normal part of daily work.
• Give them enough context to produce something useful, and recognise when they have not.
• Verify output rather than accept it, particularly around edge cases, error handling, data integrity and security.
• Know when the tool is the wrong approach and write it yourself.

Skills

Full-stack development

Relational data modelling

API design

Web security basics

Git in team workflow

Code comprehension

English writing

Tools

Node.js

TypeScript

Next.js

React Native

PostgreSQL

PHP

MySQL

Job description

We are looking for someone who builds complete applications, not someone who owns one layer of one.

You will work across the whole thing: interface, API, database, deployment. Some weeks that means adding a module to a system that has been live for two years and is used every day on active construction sites. Other weeks it means taking a problem that has never been built before and shipping the first working version of it.

The common thread is that you are expected to understand the application as a product, not as a set of tickets. Why it exists, who uses it, what breaks it, and what the person on the other end actually needs it to do.

On AI tooling. We build with AI coding assistants as a matter of course. This is not a nice-to-have or a future plan, it is how the work happens now. That changes what we hire for. Typing speed and framework memorisation matter far less than they used to. What matters is knowing what to build, giving the tools enough context to be useful, and having the judgement to catch what they get wrong before it reaches production. If you have not worked this way yet, that is fine. If you are not interested in working this way, this is the wrong role.

What You Will Do

Build complete applications

Design and build features end to end: interface, API, data model, deployment

Take a loose problem statement and turn it into something that works and can be shipped

Make product judgement calls on small things without waiting to be told

Keep existing systems running and growing

Take on applications already in production, including code written by other people with no documentation

Understand how a system behaves before changing it, then change it without breaking anything

Debug production issues down to root cause rather than patching the symptom

Find and fix security and performance problems in inherited code, in order of what actually matters

Work in an AI-assisted workflow

Use AI coding tools as a normal part of daily work

Give them enough context to produce something useful, and recognise when they have not

Verify output rather than accept it, particularly around edge cases, error handling, data integrity and security

Know when the tool is the wrong approach and write it yourself

Own outcomes

Test your own work before anyone else sees it

Say clearly when something is behind, blocked or turning out harder than expected

Document decisions so the next person, including you in six months, can follow them

What We Are Looking For

Must have

2 to 5 years building and shipping web applications, in any stack

Genuine full-stack range: you have built interfaces and the backend behind them, and you understand how data moves between them

Solid grasp of relational data modelling, API design and query performance

Working knowledge of how applications get broken: injection, XSS, insecure file handling, broken access control, and how to prevent each

Comfort with Git in a team workflow

The ability to read unfamiliar code and reason about it before touching it

Clear written English. You will write specs, READMEs, status updates and prompts, and the quality of all four affects the output.

What matters most

The ability to learn a stack you have not used, fast, without being walked through it. We use Node, TypeScript, Next.js, React Native and Postgres today, alongside older systems in PHP and MySQL. In two years some of that will have changed. We are hiring the capacity to keep up, not a specific set of framework knowledge.

Good to have

Experience with an ERP, CRM or other multi-module business system

Payment gateway integration, including webhook and reconciliation handling

Any hands‑on use of AI coding tools

Public work: repositories, live products, anything you can point at

Not required

Experience in our exact stack

Deep specialisation in any one framework

Selection Process

Application and assessment through the Wonkrew hiring portal, covering aptitude, reasoning, English, general awareness and a personality profile

A practical technical task, around 4 hours, covering code review, a small build, and working with AI tooling