Senior Product Engineer (TypeScript / Next.js)

Overview

Sownd Affects is solving noise pollution in the built environment - the problem that makes restaurants unbearable, offices draining, and venues exclusionary for the ~60% of adults
who are noise sensitive. Our solution is the world's first Audio Inclusivity Certification
Standard, launched at RICS on International Noise Awareness Day 2026 and built on an
ISVR-validated framework (University of Southampton). The first wave of Pioneer partners -
including Oscar Acoustics, Hilson Moran, dMFK, Absolute Acoustics and Asona - is already
signed, together opening up to 35 markets through the partner network.

This is not a greenfield project. The standard is launched and selling; the platform behind it
is live and being built out now - partner onboarding, assessment tools, certification
generation, and activation (NFC/QR plaque, shared dashboard, public Directory). The
founder opens the doors; you own the product and build it. A Commercial Director hire is in
progress in parallel, so you step into a product with real momentum and a team actively
converting it into revenue.
About the Role
We are looking for an experienced Senior Product Engineer to take end-to-end ownership of our product development. You will work directly with the Founder, Lead Developer, and Fractional CTO to design, build, and continuously improve our certification platform. This is a highly autonomous role where you will transform ideas into production-ready features, own technical and product decisions, and build AI-powered workflows that solve real customer problems.
Key Responsibilities
Own the product roadmap from concept to production.
Design, develop, test, and deploy full-stack features using modern TypeScript technologies.
Build scalable frontend applications using React and Next.js.
Develop backend services, APIs, and database schemas using serverless architecture.
Design and maintain AI-powered workflows, automation pipelines, and intelligent agents.
Integrate LLM technologies (Claude, OpenAI or equivalent) into production systems.
Improve onboarding, assessment processing, certification generation, reporting, and operational automation.
Collaborate closely with leadership to prioritize product initiatives.
Make architecture and UX decisions that improve customer experience.
Monitor production systems, troubleshoot issues, and continuously improve platform performance.
Contribute to engineering standards, code quality, and technical strategy.
Required Qualifications
Strong commercial experience with:TypeScript
React
Next.js
Node.js
Modern serverless architecture
PostgreSQL (Neon or similar)
Vercel or comparable deployment platforms

Experience delivering production-ready SaaS products.
Ability to own features from database design through polished user interface.
Hands-on experience integrating Large Language Models (Claude, OpenAI GPT, or equivalent).
Experience building AI agents, automation workflows, or LLM-powered features in production.
Strong understanding of API development and modern software engineering practices.
Excellent problem-solving and product-thinking skills.
Strong communication skills
English level C1
Preferred Qualifications
Experience with:MCP (Model Context Protocol)
LangChain, CrewAI, or similar agent frameworks
Multi-tenant SaaS applications
Subscription or billing systems
Serverless infrastructure

Startup or early-stage company experience.
Experience working directly with founders or cross-functional teams.
What We're Looking For
The ideal candidate:
Thinks like both an engineer and a product owner.
Can independently convert ideas into shipped features.
Cares about user experience as much as technical quality.
Works quickly while maintaining high engineering standards.
Enjoys experimenting with AI-native development practices.
Thrives in fast-moving startup environments.
Success in This Role
Within your first months, you will:
Deliver high-impact product features independently.
Build production AI workflows that automate core business processes.
Improve onboarding and certification experiences.
Support the successful rollout of the platform to early customers and partners.
Help shape the long-term technical and product direction of the company.
Tech Stack
TypeScript
React
Next.js
Node.js
Vercel
PostgreSQL (Neon)
Serverless Architecture
Claude / OpenAI APIs
MCP Integrations
AI Agent Frameworks
We offer:
Medical insurance (upon successful probation completion)
2 English lessons/week (business hours, at company's cost);
Bar on company's account;
Monthly fun events;
In addition to a competitive salary, we offer equity options

Interviews will be held in English, and for further consideration as a candidate you will need to submit a CV in English. Also you'll be asked to work as a Private Entrepreneur.