UX/UI Designer (B2B SaaS, UX-focused)

About the product:

Techstack is a technology product engineering company working with startups, scale-ups, and enterprises across healthtech, education, logistics, construction, and AI. We build, rebuild, and scale software products, from discovery and MVP to enterprise transformation.

We’re looking for a UX/UI Designer to join our project for a Netherlands-based bookkeeping platform with a client-facing front office and a bookkeeper-facing back office. The project introduces ledger-code management and double-entry Journal Entries, which will affect several existing back-office workflows. Draft designs and requirements already exist for some of these flows. Your task is to review and validate them, improve the UX where needed, and complete the missing screens within the client’s established design system.

Engagement details:

• Short-term, part-time: 16 hours/week, approx. 64 hours in total

• Duration: approx. 4 weeks, November 5 – December 2, 2026

• Start: ASAP, target date November 5, 2026

• Possible involvement in a future phase, subject to client approval

• Timezone: Ukraine (EET–EEST), with overlap with Netherlands business hours

Your team:

You’ll join an existing Techstack project team: Project Manager, Software Engineer, QA Engineer, and Solution Architect. You’ll also work with the client’s stakeholders responsible for product requirements and workflow approvals.

Culture:

We uphold high standards in the tech industry and continuously evolve to meet them. Every team member can influence the product, the company, internal processes, and their own professional growth. We also regularly organize team-building activities to keep a friendly atmosphere and simply enjoy time together.

Your responsibilities:

• Review existing draft designs and requirements for ledger-code management and Journal Entries workflows

• Validate that user flows are logical, consistent, and aligned with existing product behavior

• Conduct a critical UX assessment and suggest improvements where necessary, without redesigning the existing UI

• Work with developers and the solution architect to align design decisions with technical constraints, including workflow states, validations, and system logic

• Complete or correct approx. 10 missing screens, modals, and UI states

• Ensure all designs follow the client’s established design system

• Clarify missing requirements and edge cases with the project team and client

• Prepare final designs and provide the necessary clarification for development handover

It’s about you:

• Strong UX expertise and proven experience with complex B2B or SaaS applications

• Ability to analyze and improve existing user flows rather than redesign a product from scratch

• Experience working within established design systems and UI guidelines

• Strong understanding of user journeys, interaction patterns, workflow states, validation rules, and error handling

• Hands-on experience with user flows, wireframing, prototyping, and interaction design in Figma or an equivalent tool

• Ability to constructively challenge existing design decisions and propose practical improvements

• Comfortable discussing UX decisions and technical trade-offs with developers and solution architects

• Ability to work independently, review incomplete requirements, and identify missing scenarios

• Good English communication skills for collaboration with the international team and client

• Experience with accounting, financial, or ERP software is a plus

What we can offer you:

• Stable and long-term position in an experienced team

• Broad opportunities for professional and career growth: challenges, meetups, hackathons, professional communities, and more

• Direct communication with all stakeholders and the ability to influence product development

• Horizontal connections and no micromanagement: all team members are accessible to each other for any questions

• Hubs in Kharkiv, Kyiv, Lviv, and Wrocław (Poland), or everything necessary for remote work

• Up to 50% compensation for educational courses and conferences

• Free English and business English courses

• 20 days off and 7 sick days

• Legal and accounting support

• Appreciation gifts for significant events and occasions

How to join Techstack:

1. Pre-screening with a recruiter and portfolio review

2. English Check

3. Technical Interview with our Expert