Öykü Kosma

Lead UX Designer at HERE Technologies, Berlin

I spend my days on tricky problems inside tools people use every day, and I'm happiest when the result makes someone's work a little easier.

3% → 18%retention after 8 weeks40% → 75%self-resolution
HERE Developer Assistant2026
An AI assistant developers trust, because every answer says what was checked. View case study →
1 clickto an insight, down from 8+
Usage managementHERE · 2025
A usage page that opens with what needs your attention. View case study →
−96%billing corrections
Usage alertsHERE · 2025
Admins hear about a spike before the bill does. View case study →
2.0 → 4.3App Store rating117user interviews
Spark, a dating app for Gen ZSpark Networks · 2020 to 2021
Profiles built on interactive frames, so people can show who they are. View case study →
How I work From the real problem to results you can measure
01 Find the real problem I talk to customers and look at the data before designing anything.
02 Test early with real users I prototype quickly, with AI and in code, and put it in front of people.
03 Build patterns teams can reuse I turn solutions into patterns that other teams can use again.
04 Measure and keep improving I agree on success up front and follow up after launch.
Experience More than ten years of design, in six cities
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Apr 2026 to nowLead UX DesignerHERE Technologies, Berlin
Set design direction across data platforms, analytics tools and developer services, and own the most ambiguous problems from scoping to delivery.
Led the AI Developer Assistant from chat to task completion: retention 3% to 18%, self-resolution 40% to 75%, time to resolve down 45%.
Run workshops with product managers and engineering leads to turn research into priorities, and mentor newer designers.
AI productsDesign leadershipMentoring
2024 to 2026Senior UX DesignerHERE Technologies, Berlin
Unblocked a stalled cost transparency project with customer and internal research. Anomaly alerts cut billing corrections by 96%, and pay-as-you-go adoption reached 30%.
Redesigned Usage Management across product, billing and support, cutting support tickets by 30%. The patterns went into the HERE Design System.
B2B platformsResearchDesign systems
2021 to 2024UX Designer IIHERE Technologies, Berlin
Designed HERE Last Mile end to end, a real-time tracking tool for delivery dispatchers, then WeGo Pro for drivers.
Designed data-heavy B2B tools built on HERE traffic and road network data.
LogisticsData products
2020 to 2021UX DesignerSpark Networks, Berlin
Led the design of Spark from research to launch, replacing photo-first profiles with interactive prompts.
Took the App Store rating from 2.0 to 4.3 in three months without paid marketing, and retention went up 15%.
Built the design system from scratch for eight engineers shipping weekly.
Consumer appsDesign systems
2019Service and UX Designer, internBosch, Stuttgart
Service design research on future urban mobility, with stakeholder maps, journeys and storyboards made in design sprints.
Service design
2019UX Designer, internIBM, Brussels
Designed UX for two defence industry products where precision and traceability mattered. IBM Design Thinking Practitioner.
Regulated products
2017UX DesignerBiletix (Ticketmaster Turkey), Istanbul
Rebuilt the responsive website, and mobile engagement went up 20%. The team won 1st prize at the 15th Altın Örümcek Awards.
Responsive web
2015 to 2017Freelance UX DesignerTurkey, Belgium, Italy
Projects included a Jaguar Turkey landing page, an insurance tool for Ataflex and a student exam-calendar app.
Freelance
2011 to 2021EducationIstanbul, Kortrijk, Milan
MSc Product-Service System Design, Politecnico di Milano.
BSc Industrial Product Design, Istanbul Technical University, with an exchange at HOWEST in Kortrijk.
Product-service design