Make Your Resume Now

Senior Full-Stack Engineer, App Platform

Omnisend
Lithuania
Posted June 16, 2026
Full time

Job Overview

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.

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 Senior Full-stack 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. 

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.

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 Senior Full-stack 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.

  • Proven ability to drive technical decisions end-to-end - from identifying gaps in internal or customer-facing tooling to shipping solutions with measurable impact.

  • 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).

  • Customer centricity.

How we work and what we value:

  • Company-wide OKRs.

  • 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 7000 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.

  • 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.

    •  

Omnisend is an email and SMS marketing platform built for ecommerce brands. With one-click integration to major ecommerce platforms, intuitive automation, and powerful email templates, we make sophisticated marketing effortless — no learning curve required.
 
Award-winning 24/7/365 customer support? Check. A platform trusted by growing brands and seasoned pros alike? Absolutely. The idea that “great marketing needs to be expensive”? Our 150,000+ customers prove that wrong every day.

Ready to Apply?

Take the next step in your career journey

Apply Show More Jobs

Stand out with a professional resume tailored for this role

Build Your Resume – It’s Free!