Science jobs in United Kingdom

🚀 EverAI — Building the Future of AI Companionship

One of the Top 15 Largest & Fastest‑Growing AI Companies in the World

35+ Million Users in 2 years — Help Us Reach 100M first, 500M next

At EverAI, we’re shaping what it means to connect with AI. With 35+ million users and counting, we're not just building products — we're creating entirely new categories.

Our flagship product is the world’s largest AI girlfriend/boyfriend platform, redefining relationships for millions. It is governed by our proprietary moderation system, EverGuard — an internal AI designed to ensure everything we build is safe, ethical, and human‑first.

And we’re only just getting started!

We are an enthusiastic, passionate and hardworking team of 70 people. Our founding team has strong entrepreneurial experience building and scaling web products from 0 to IPO.

Alexis Soulopoulos [CEO]

• 10+ years in Tech Executive Leadership

• Co‑Founder Mad Paws Holdings (from 0 to IPO)

• Forbes 30 under 30 + Deloitte TechFast50 ’22 & ’23

Michael Monin [Co‑founder & CTO]

• 10+ years as CTO / COO (web2/web3), 1+ year in AI/LLM

• Serial‑entrepreneur: MTK Digital (exited / 0->$20m revenue) and Zipchat (AI Chatbot for E‑commerce brands)

Thomas Lacroix [Co‑founder & CMO]

• 8+ years in Customer Acquisition & E‑commerce Growth

• Serial‑entrepreneur: Curatible (sold to Blackstone) and MTK Digital (exited / 0->$20m revenue)

Maruša Fasano [CFO/Legal]

• 25+ years in Finance, Strategy, M&A

• Ex‑CFO/M&A @Curatible (exited to Blackstone)

• Ex‑President of the Board @SotremoSA (exited)

• Co‑founder/CFO @SoftOne (exited)

Our tech team is expanding rapidly to keep pace with the ambitious feature roadmap we've set out. We are therefore hiring experienced Senior Software Engineers (Back‑end / Ruby) to help us build and scale our product. You’ll have the opportunity to help define our roadmap and find the best technical solutions to help our customers. You will also have time to run some experiments and bring new ideas to the table.

Reporting directly to our Tech Lead, you will be responsible for:

• Interacting with the Product Manager to review project specs
• Preparing integration plans, break‑downs, and estimations
• Hands‑on code implementation, PRs, code reviews, testing, etc.

You’ll be working with Michael (co‑founder and CTO) along with the product team and the engineering team (web developers, SRE, data scientists).

💎 NB: while we remain open to full‑stack expertise, we are looking for people with a strong edge on back‑end development using Ruby‑on‑Rails.

💼 5+ years of experience:

• As a back‑end or full‑stack software engineer – recent experience with Ruby‑on‑Rails is mandatory
• In tech scale‑ups or any similarly agile and fast‑paced environment
• On large‑scale products where your code was used by thousands of monthly users

🗣 Strong communication & collaborative skills (perfectly fluent in English)

🧢 Ownership and commitment – we’re looking for owners, not renters

⚡️ Doer mindset – we are moving fast and we need people who can find the right balance between software craftsmanship and velocity

🫶🏻 User‑centricity – you are proud of what you build and you share our obsession for amazing user experience

🍭#NSFW‑ you are comfortable building products that are based on uncensored models and content

• Past experience and/or interest in data science and generative AI (NLP, ML, MLOps…)
• Experience working with globally distributed teams

📈 Exponential Growth: From 35M+ users in 2 years, to 100M next — and 500M beyond

🚀 Track Record of Category‑Creating Innovation: We consistently launch world‑first AI applications — setting the pace, not following it

🌍 Global Impact: Top‑tier user growth, real‑world adoption, and cultural relevance

🧠 Proven Leadership: A senior team that’s launched, scaled, and exited & IPO’d multiple scale ups — now fully focused on reshaping AI companionship

👥 Elite Remote Team: 100% remote and built to win — world‑class talent from Tier 1 tech companies, with a culture of ownership, velocity, and radical creativity

🛡️ Ethical Core: Our AI ecosystem is governed by EverGuard, our proprietary AI moderation technology, ensuring responsible development at scale

✍️ Contract Type: We prefer B2B, but we’re flexible, what matters is long‑term commitment and impact
📍 Work From Anywhere: Fully remote. Choose the environment where you do your best work
🏝️ Paid Time Off: 4 weeks (20 working days) of PTO per year to recharge and reset
👨👩👧👦 Annual Gathering: A yearly in‑person meetup to connect, brainstorm, and celebrate wins together
❤️🩹 Health & Wellness Support: Up to $200 per year for wellbeing expenses + unlimited 1:1 sessions with psychologists and lifestyle experts through OpenUp (also available for up to three family members)
🏢 Co‑Working Space Budget: Work from a co‑working space up to twice per month (35 EUR / 40 USD per visit) to stay inspired and connected
📚 Learning Budget: Dedicated funds to support your professional growth: courses, books, conferences, events, or certifications
💻 Equipment: Company laptop provided + monitor budget up to $250 for your workspace setup
⚡ AI Tools Access: Premium access to ChatGPT, Cursor, Hugging Face, and others, to power your ideas and workflows

We’re a fully remote group of A‑players from Tier 1 tech, led by an exec team who’ve launched, scaled, and exited multiple companies. We move fast, and care deeply about what we build — and who we build it with.

We’re looking for exceptional talent ready to ship & distribute world‑first AI products at scale, fast, and co‑create with us this category‑defining business.

If that’s you — reach out and apply!

Know someone who could be a great fit for this role? You can refer them through the EverAI External Referral Program and earn a bonus of up to $2,500 if they’re hired. Submit a referral here.