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Senior Full-Stack Engineer (FE Focused)

Location: Vilnius / Kaunas, Lithuania

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Lumos Recruitment is a top - notch recruitment agency focused on connecting exceptional talent with leading companies across IT, Finance & Accounting, Marketing & Sales, and Executive Management roles. With a proven track record of successful placements and expertise in niche recruitment, we go beyond traditional hiring practices to deliver tailored, high-quality recruitment services that meet the specific needs of your business.

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Our Client, Omnisend is an email and SMS marketing platform built for ecommerce brands. Offering one-click integration with major ecommerce platforms, ready-made automation and email templates, and award-winning 24/7/365 customer support, Omnisend is loved by professionals and newbies alike. The idea that "great marketing needs to be expensive" is proven wrong every day by over 125,000 Omnisend customers who are successfully growing their businesses through email and SMS marketing.

Working at Omnisend is... kind of boring.

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Not the soul-crushing kind of boring — more like the “no drama, no chaos, just smart people doing great work” kind. The kind that lets you focus on what matters, without pointless meetings, micromanagement, or bureaucracy. We’re data-driven. We test, we iterate, we improve. Gut feelings don’t drive decisions — insights do.

We trust each other. We’re transparent, give real feedback, and actually listen. No egos, no hand-holding — just a team of experienced professionals moving fast, adapting easily, and delivering impact.

Omnisend is customer-funded and customer-driven. Our work is rooted in solving real problems that help ecommerce brands grow. No empty promises — we bring in results.

And yes, we have fun. But the grown-up kind — workations, team gatherings, the occasional party. No forced fun, no awkward icebreakers. Just genuine moments with a team that actually enjoys working together.

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What you’ll do @Omnisend:

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  • Play a key role in the Content Creation team, influencing product development decisions 

  • Build a product that enables customers to craft relevant and impactful marketing messages for their audience

  • Use your technical expertise to solve complex problems

  • Leverage AI to streamline your daily operations and build AI solutions that drive real value for our customers

 

We expect that you’ll bring:

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  • Hands-on experience (5+ years) implementing and maintaining scalable, highly available systems with strong focus on performance and user experience

  • Strong front-end experience with a solid understanding of back-end technologies

  • Mastery of core front-end languages (HTML, CSS, JavaScript, TypeScript) and frameworks (React, Angular)

  • Strong customer-centric mindset, delivering solutions that create real value for end-users

  • Passion for ensuring quality of the deliverables and product as a whole

  • In-depth knowledge of browser APIs, web performance optimization techniques, and accessibility best practices

  • Experience with back-end technologies such as Go or Node.js

  • Solid understanding of database concepts (SQL/NoSQL) Experience with any cloud provider (at Omnisend we use Google Cloud Services)

  • Experience with event based architecture

 

How we work and what we value:

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  • Company-wide OKR

  • Empowered product teams that solve customer and business problems

  • Objective-based planning and experimentation-driven delivery

  • Product-led growth

  • We look at product metrics daily, we speak to our customers and do it often

  • Outcomes and bringing value to our customers over outputs and feature factories

  • Ship to learn. Experimentation to validate hypotheses and assumptions

  • Truly embracing data-driven decisions

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What we offer in return:

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  • Gross salary starting point from 5500 EUR/month based on experience

  • An unlimited learning budget for self-improvement complying with the best interest of Omnisend

  • Working methods and best practices inspired by the best tech companies in Silicon Valley

  • Senior colleagues (over 70%) enable us to have a high-performing, productive environment where your growth will accelerate

  • Flexible working hours and remote work possibilities

  • Private health insurance

  • Unlimited access to psychotherapy

  • Workstation budget

  • Personalised work anniversary gifts (house cleaning, spa treatments, international flights etc.)

  • Attractive company-led yearly workation abroad and team-led team-building events

 

Monthly Salary:

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Gross salary starting point from 5500 EUR/month based on experience.

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