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Mid-Senior Front-End Developer

S3 Int
Full-time
On-site
Vilnius, Lithuania
€5,800 - €6,800 EUR monthly

Job Description

Strategic Staffing Solutions International’s client FlexShape Lithuania is a EnergyTech company owned by the Danish energy multi-utility company EWII. In Vilnius, the company develops software solutions for managing flexible energy assets, including automated energy planning, portfolio optimization, and electricity trading.

Flexshape’s own Aggregator-as-a-Service solution has come to life as FLEXii, a product with the vision of empowering the energy transition by making electricity markets accessible, transparent, and rewarding for owners of renewables and battery storage systems. The platform combines near real-time stream processing with advanced energy forecasting, aggregation, and optimization techniques.

By joining FlexShape either as a Mid or Senior Front-end Developer, you will have the opportunity to play a crucial role in building the new FLEXii customer portal - a key part of our Aggregator-as-a-Service platform that connects owners of renewable and flexible energy assets with electricity markets in an intuitive, user-friendly way. You’ll help to shape the first MVP version of the portal, delivering a strong initial user experience that will evolve continuously based on feedback from real users. You’ll collaborate closely with our internal product and backend teams, as well as an external design agency who will support the handover of the visual and UX design. Your input will be instrumental in translating these designs into a living, breathing digital product — helping to break down complex market participation into simple and intuitive elements for users.

We’re looking for someone with a strong front-end focus and a genuine passion for creating elegant, engaging, and high-performing interfaces that make technology feel effortless. We value an entrepreneurial mindset — someone who enjoys turning ideas into tangible results, thrives in an iterative environment, and sees opportunities where others see constraints. If you love crafting digital experiences that make complex technology simple and rewarding to use, this role is for you.

 
 

Key responsibilities:

  • Develop and improve relevant graphical user interface (GUI) components
  • Transfer visual and UX design into living front-ends
  • Automate tests of GUI components
  • Collaborate with internal product and backend teams
  • Collaborate with and collect feedback from end-users
  • Improve usability and overall user experience.
  • Improve the team processes and efficiency with new bold ideas.
 

For a PERFECT match, you need:

  • Keen eye on UX
  • Strong Knowledge of Vue.js, React.js, TypeScript, or JavaScript tooling (e.g., PNPM, NX, Vite, Rollup) and any component frameworks (e.g., Vuetify, Quasar)
  • Experience developing web or single-page applications (SPA)
  • 3+ years (Mid-level) to 5+ years (Senior-level) of experience in developing non-trivial front-ends
  • Experience integrating frontends with backend APIs (e.g., via OpenAPI/Swagger, gRPC, etc.)
  • Experience in using version control systems (primarily Git)
  • Prior experience with Scrum workflow
  • Strong written and spoken English skills (at least B2 level)
  • (Nice-to-have) Backend development experience (with Scala, Java, or C#)

The company offers:

  • Competitive salary: 5800-6800 EUR gross depending on your skillset and experience.
  • Hybrid work mode (at least 3 days/week from the Vilnius office).
  • Ability to work with state-of-the-art smart and renewable energy technologies, including batteries, solar panels, and wind turbines.
  • Ability to work in a highly qualified, close-knit, and high-performing team.
  • Opportunity to collaborate with leading European electricity utilities and electricity market players.

Additional perks:

  • Free choice account for paid perks
  • Health insurance
  • New Office space in the Core business Center
  • Gym amenities are free for all employees at Core Business Center

Team introduction

We are a close-knit, ambitious dev team building an "Aggregator-as-a-Service" platform for a major Danish organization, fusing real-time stream processing with smart energy forecasting and optimization. Our evolving microservices stack is built on Scala, TypeScript, and Vue.js, and we pragmatically choose the best tool for the job, valuing sound engineering over dogma. In our fast-paced environment, we grant high individual autonomy and ownership while fostering a deeply supportive culture through rituals like daily "technical coffees" for knowledge sharing and bi-weekly "technical digestion" sessions to collaboratively refine our workflows. While we offer flexibility, we thrive on the energy and camaraderie of our spirited, English-speaking office.

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