Senior Full-stack engineer (App platform, Vilnius or Kaunas)

Working at Omnisend is... kind of boring. 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. We are currently seeking a Senior Full-stack Engineer. At Omnisend, those who possess a proactive and product-minded mindset, as well as a passion for crafting impactful software products, will find the perfect fit. As a Software Engineer on our App Platform team, you will have the opportunity to work alongside highly skilled individuals, ensuring the development, maintenance and oversight of our AI platform, Front-end platform and other developer experience solutions, as well as supporting experience teams by creating innovative solutions. What you’ll do @Omnisend:

Play a key role in platform and product development decisions

Improve and build features for the platforms, ensuring seamless functionality, scalability, and user-friendliness

Identify and resolve intricate technical obstacles affecting functionality, user experience, or system performance of the platforms

Ensure optimal platform health by implementing and managing robust monitoring, logging, and alerting mechanisms

Identify areas for improvement within the platform and suggest creative ideas to enhance functionality, maintainability, or developer experience

Follow established coding standards 

Contribute to the team's knowledge base by documenting best practices and lessons learned for efficient platform development

We expect that you’ll bring:

Hands-on experience (5+ years) implementing and maintaining scalable, highly available, high load systems

Strong skills in system design and architecture are essential

Keen interest and/or experience in building AI tooling and agent-based systems

Thorough understanding of core front-end languages (HTML, CSS, JavaScript) and frameworks (React, Angular)

Comprehensive knowledge of TypeScript

Understanding of frontend build tools

Knowledge of browser APIs, web performance optimization techniques, and accessibility best practices

Experience with back-end technologies (Node.js, Go) to handle server-side logic and API interactions

Proficiency in database concepts (SQL/NoSQL) and experience working with APIs or data fetching mechanisms

Expertise in using Git for version control, maintaining code history, and collaborating on platform development

Experience with writing unit and integration tests and familiarity with debugging tools to identify and fix issues effectively

Familiarity with modern software build pipelines and tools

Experience with real time distributed messaging tools and event based architecture

Working experience with any cloud provider (at Omnisend we use Google Cloud Services)

How we work and what we value:

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

What we offer in return:

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

Quarterly salary reviews

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

Over 80% senior colleagues in Product - and over half company-wide - to accelerate your growth

Flexible working hours and remote work possibilities

Private health insurance

Unlimited access to psychotherapy

Workstation budget

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

Annual company trip abroad, company gatherings twice a year, team-led teambuildings

Additional days off for KASP and Rifleman’s Union members

Inclusive family-related time-off policy