Senior Fullstack Developer (React + Node.js)

We are looking for an experienced Fullstack Developer to join our growing development team in Sofia, Bulgaria. If you enjoy building modern web applications and solving complex technical challenges we’d love to hear from you.

Requirements:

• 4+ years of professional experience with JavaScript

• 3+ years of professional experience with TypeScript

• 3+ years of experience with React

• Solid experience with Node.js

• Strong knowledge of relational databases (MySQL and/or PostgreSQL) and MongoDB

• Good understanding of HTML5 and CSS3

• Experience with Git and collaborative development workflows

• Strong analytical thinking and problem-solving skills

• Good understanding and usage of coding agents such as Claude Code or Codex

• Good written and spoken English

• Regular work from our Copenhagen office for the initial 3-6 months

Advantages:

• Experience with Angular

• Experience with Docker

• Experience with WebSockets or real-time applications

• Experience integrating LLM APIs (e.g. OpenAI, Anthropic, DeepL)

• Hands-on experience designing and implementing AI agent or multi-step AI workflows

What we offer:

• This is a full-time position that comes with an excellent salary and an opportunity to grow within the company based on demonstrated merit

• Supportive environment

• Hybrid model of working

• 25 days annual paid leave

• Annual team building that gathers together the offices from Sofia and Copenhagen

• Mini-team buildings and other local company events that run throughout the year.

• Modern office with fresh atmosphere and good transport links

• Free beverages

Who we are:

SaaS scale-up in growth!

We are a software company that develops and staffs live chat features for companies that want to convert multiple website visitors into leads. Today, we handle chats for 2400+ companies in the Nordic region and have ambitions to become the leading provider in the global market. With our ambitious growth goals, the development of our IT team takes a crucial role – here you come into play!

We + reply = Weply

We meet our customers visitors’ needs for instant replies and personal customer experience via a dedicated and trained team of chat agents, ensuring a meaningful real-time engagement. Our chat solution is proven to increase conversions and customer loyalty.

By having real people assisted by artificial intelligence to answer chats, every inquiry gets a fast response and qualified leads are identified, delivered to our clients. This leaves them with more time to focus on their expertise.

Team of Vikings

Our commercial team sits in our offices in Copenhagen, Denmark, while our product development team is based in Sofia, Bulgaria. We have a large network of chat agents spans in 130+ locations all over the world. True to the old Viking traditions, we are explorers, dreamers and occasional party-doers!

Pro-Tip: Skip the cover letter and pitch us in 3 sentences why exactly you are the perfect match for our team!