Marllm.io - Senior Full Stack Developer

Hi, I’m Jolanta. I am an engineer-turned-founder, originally from Lithuania and now based in London. At Marllm.io we’re building a marketing-tech platform that helps businesses win customers without pouring cash into ads or wrestling with SEO. We keep things lean, practical, and experiment-driven so we can move fast and learn even faster. I lead a tight crew of five (plus a few brilliant advisors) and we’re gearing up for our first VC round. The vibe? Supportive, low-ego, and big on shared ownership. If you love turning fresh ideas into working code that solves real problems, you’ll fit right in.

We’re looking for a Full-Stack Developer at a Senior level. You’re someone who can grow into our future Lead Engineer, partnering with the technical founders to ship bold, user-focused features and keep our codebase clean and maintainable.

In this role, you will:

• Design and implement scalable, maintainable software architectures
• Build client- and server-side applications with top-notch performance
• Develop proprietary AI models, LLM prompts, and other ML solutions
• Manage and optimise AWS environments, Cloudflare, NGINX, Docker
• Drive product decisions and champion human-centric development
• Document processes and code for clarity and future onboarding
• Interact with clients, onboard new engineers, share knowledge
• Solve unforeseen technical challenges with a calm, logical approach

This is a full-time gig (four-day week possible) working mostly on UK hours ± 2 hours. You’ll thrive in this role if you have:

• 6+ years of experience with MERN stack, Next.js, TypeScript, AWS, Cloudflare, NGINX, Vercel, Docker
• Proven track record building complex architectures from MVP to production
• Solid hands-on experience with AI/LLM applications and model deployment
• Comfortable across front-end (HTML, CSS, Tailwind) and back-end (Pinecone, microservices, serverless)

Brownie points:

• SEO know-how
• Deeper AI/ML chops (Colab, Streamlit, FastAPI, PyTorch, etc.)
• Entrepreneurial streak and previous startup exposure
• Ability to pivot quickly and learn on the fly
• Python experience

You’re a curious problem-solver who communicates clearly, embraces change, and loves aligning tech decisions with user and business needs. You own your work, give candid feedback, and prefer simple solutions over fancy ones that don’t add value.

What’s in it for you?

• $6,000 - $6,500 per month
• Full-time, fully remote (option to work a four-day week)
• 20 days paid time off
• Rapid skill growth in a low-ego, pragmatic dev culture
• Chance to shape a fast-scaling product from the ground up

Ready to build something meaningful and level-up fast? We can’t wait to meet you!

Please note that this is a gross salary and that you are responsible for any tax-related procedures in your country of residence. We kindly ask you to apply only if you are happy to work remotely as an independent contractor.

The hiring process for this position will include the following steps:

• Filling in the application form once you click “Apply”
• Upload your CV
• Short interview with a technical recruiter
• Coding test, if short-listed
• Attending video interviews with the hiring team where you will have the opportunity to talk more about your previous experience and the new role

To ensure your application is considered, take the time to carefully read the job description and submit a high-quality application. We will, of course, provide you with feedback throughout the process.

At the request of the employer, applications for this position must be submitted through JobRack and direct contact with the employer is not allowed. We are committed to maintaining a respectful and professional environment for our jobseekers, our clients and the JobRack team. Any form of abuse or disrespect towards our team will result in immediate disqualification from this and all future opportunities through JobRack.

Please note that this position requires 100% commitment and is not suitable for those seeking a side job, freelance work, or part-time employment. It is important to only apply if you intend this to be your primary and only full-time job. Any attempts to work multiple full-time jobs without the knowledge of your employer may result in termination and a ban from applying to other jobs on the JobRack site.

Got questions about working remotely? Check out JobRack’s FAQ for answers to everything you might want to know.