Senior Fullstack Developer
The posting does not state a salary. This range is our estimate from the role, the location and the stack — treat it as a guide, not an offer.
- Level
- Senior
- Apply from
- Apply from anywhere
About the role
- Strong in Ruby on Rails and React.
- Focus on developer experience and product outcomes.
- Comfortable with ambiguity and problem-solving.
- Own features from concept to production.
- Proactive communicator with realistic estimates.
Skills the posting asks for
- Ruby on Rails
- React
- TypeScript
- PostgreSQL
Summarised from the employer’s posting, which is reproduced in full below.
The employer’s full posting
Location: Remote · Collaboration: Freelance, via Monterail Tech Network · Start: ASAP
The project
Some products you use every day without ever seeing them. This is one of those.
Our client is a well-established B2D (business-to-developer) SaaS platform -real-time infrastructure that moves billions of messages a day for developers around the world. Live chat, dashboards, collaborative apps, state synchronization: if it updates in front of your eyes, there's a good chance technology like this is running underneath.
The role
This is a product-minded engineering role, not ticket execution. The team is deliberately moving away from reactive delivery toward engineers who understand customers and drive outcomes. You'll take features from a loose concept to shipped and monitored in production — dashboards, billing UIs, documentation platforms, developer-facing tools — proposing what should be built, not waiting for a roadmap to tell you.
And here's the fun part: the customers are developers. You'll use the product yourself and fix the frustrations you'd want fixed.
What we're looking for
- A fullstack craftsman. You're strong in Ruby on Rails and React and comfortable moving across the stack - from complex dashboards to sleek documentation platforms.
- A DevEx champion. You have natural empathy for other developers and genuinely care about the developer experience of the tools you build.
- Comfortable with ambiguity. You thrive when the brief is vague. You identify problems, propose solutions, and ship with minimal hand-holding.
- An owner. You see features through their entire lifecycle — from the first line of code to the final metric in production. Quality issues that surface after release are still yours.
- A proactive communicator. You give realistic estimates, meet your commitments, and speak up early if a timeline is at risk.
- Fluent with AI coding assistants. The team uses them actively for planning, prototyping, and iteration — you should too, while owning the correctness and quality of everything that ships.
- Design and UX intuition. You notice when a flow feels wrong and you're not afraid to say so.
Tech stack
React + TypeScript on the frontend, Ruby on Rails on the backend, some Node/TypeScript services, PostgreSQL underneath.
Nice to have
- Experience building developer-first products or working on B2D platforms
- Experience with products grown through product-led growth (PLG)
- Background in real-time, messaging, or infrastructure-adjacent products
How the collaboration works
This is a freelance engagement through the Monterail Tech Network - you work with us on a B2B basis, embedded in the client's team, with Monterail handling the partnership side. Read more about what freelancing with us looks like at Monterail Tech Network .
Sound like you?
Send us your resume — and if you've built anything for developers before, we'd love to hear about it.