Senior Engineer, Infrastructure

Job Description
Tieto Tech Consulting, is looking for a highly skilled and motivated
Middle Java Full Stack Developer
, a professional who will join a project within a Telecom Team for our respectful client BICS.

Join the team of our customer BICS – a global telecommunication enabler with a physical network stretching through the globe! Grow your expertise through interacting with A-level mobile carriers from all over the world. Get your hands on the vast network with on land, underwater, and space points of presence. Join our decade-long partnership with BICS to ensure confidence in your future and long-term growth! Tieto-BICS team has been growing since 2010… and we are looking forward to grow with you!

• Develop your telecom expertise in diverse portfolio of BICS products, including Voice, Cloud, Signaling, LTE, IoT, etc.
• Enjoy unmatched growth opportunities with BICS vast network and customers around the world.

Tieto - BICS team has been growing since 2010… and we are looking forward to growing with you!

Responsibilities

• Design, develop, and maintain scalable applications using Java and modern frontend technologies
• Lead by example and mentor a development team in day-to-day delivery while continuously improving engineering practices
• Drive technical discussions and contribute to architecture decisions
• Collaborate closely with stakeholders, product owners, and cross-functional teams
• Ensure clean, maintainable, and well-tested code
• Take ownership of features and deliver end-to-end solutions independently

Requirements

• 2+ years of experience in commercial software development using Java
• Strong experience with Java 17+, Spring, Spring Boot, Hibernate, and JPA
• Good knowledge of JavaScript and React.js
• Experience in API design and development
• Strong understanding of relational and NoSQL databases, with expertise in writing and optimizing complex SQL queries
• Solid understanding of design patterns, clean code principles, and testing practices
• Experience working in Agile/Scrum environments
• Strong communication skills in English
• Openness to using modern AI tools in daily development workflows (e.g. GitHub Copilot, Claude Code, ChatGPT)
• Ability to travel abroad for business trips

Nice to Have

• Experience with microservices architecture
• Cloud and cloud-native experience (AWS is a plus; Azure or Google Cloud also valuable)
• Experience with OSS/BSS integrations; knowledge of CAMARA and GSMA standards is a strong advantage
• Experience with Test-Driven Development (TDD)
• Experience in performance tuning and system optimization

Personal Skills

• Leadership mindset with a hands-on approach
• Proactive, self-driven, and solution-oriented attitude
• Strong analytical and problem-solving skills
• Team player with a collaborative mindset
• Ability to estimate work accurately and commit to delivery plans

Additional Information

At Tieto, we believe in the power of diversity, equity, and inclusion. We encourage applicants of all backgrounds, genders (m/f/d), and walks of life to join our team, as we believe that this fosters an inspiring workplace and fuels innovation. Our commitment to openness, trust, and diversity is at the heart of our mission to create digital futures that benefit businesses, societies, and humanity.

Diversity, equity and inclusion | Sustainability | Tieto

Stay Alert To Recruitment Scams

• Tieto only communicates via @tieto.com email addresses.
• We never ask candidates to pay fees or share financial details during recruitment.
• If you receive a suspicious message claiming to be from Tieto, don't respond — verify it via our official careers site.
• For more information visit Important Advisory Regarding Recruitment Fraud | Tieto Blog

MWDN is a global IT outstaffing company with 23+ years of experience that connects exceptional tech talent with leading companies across Israel, the USA, Great Britain, and Western Europe. We offer opportunities to work on international products in a stable and professional environment.

Why does MWDN rock?:

Here’s what you can expect when you join MWDN:

• Security: We carefully vet our clients to minimize risks and ensure reliability and timely payments - no fraud or unpleasant surprises.
• Career support: If a project isn’t the right fit, we support you and actively help find new opportunities that match your skills and career goals.
• Legal assistance: We provide guidance on legal matters, including opening and managing your independent contractor or sole proprietorship status, taxes, and related processes.
• Professional development: We offer English courses and professional growth opportunities, as well as team-building events.

Why choose us? MWDN is ranked among the top 5 IT employers in our region according to DOU. We take pride in our transparency and strong commitment to our team. Curious to learn more? See what our employees say about working with us on DOU.

What makes this project exciting?:

Our client is an international technology and consulting company specializing in digital transformation for enterprise businesses. The company partners with leading organizations across various industries, delivering innovative solutions in AI, cloud, data, customer experience, and business process optimization.

We are currently looking for a Full Stack Engineer to join the team. This is a great opportunity to work on international projects, solve complex technical challenges, and collaborate with experienced professionals in a fast-paced environment.

What Makes You a Great Fit

• At least 5 years of commercial experience in Software Development;
• Strong experience in backend development with C# and .Net;
• Strong proficiency in React, JavaScript, Typescript
• Experience with SQL databases
• Hands-on experience with Cypress or similar testing tools;
• Familiarity with Azure cloud services;
• At least Upper-Intermediate level of English

Your Day-to-day In This Position

• Develop and enhance full-stack web applications, contributing to both frontend and backend components;
• Build scalable and maintainable solutions using modern technologies and engineering best practices;
• Create responsive user interfaces and ensure a seamless user experience across applications;
• Design, implement, and optimize server-side functionality, APIs, and database interactions;
• Maintain high standards of code quality through testing, code reviews, and technical documentation;
• Collaborate with product, engineering, and other cross-functional teams to deliver reliable software solutions;
• Participate in cloud-based application deployment, maintenance, and performance optimization;
• Contribute to technical discussions, architecture decisions, and continuous improvement initiatives.

Why work with us?:

• People-first management with minimal bureaucracy
• A friendly company culture, proven by employees who choose to return
• Flexible working hours
• Full financial and legal support for independent contractors
• Free English classes, with native speakers or Ukrainian teachers
• Dedicated HR support

Our Next Steps
✅ Intro call with a Recruiter — ✅ Technical interview — ✅ Interview with Hiring Manager — ✅ Offer

Що варто знати про SKELAR?
Це венчур-білдер — іншими словами, компанія, яка будує компанії. З нами фаундери створюють consumer-бізнеси, які стають лідерами на глобальних ринках EdTech, Mental health, Petcare, FashionTech та інших.

Скеларівці будують tech-продукти, які здобувають відзнаки від Product Hunt, The Webby Awards та отримують тисячі позитивних відгуків на TrustPilot. Загалом tech-продуктами наших бізнесів користуються 10+ млн людей у світі.

Усе завдяки сильним командам, бо наші спеціалісти — це ключова цінність SKELAR.

Для професійної реалізації ми створили середовище з експертизою та необмеженими можливостями — і шукаємо тих, хто прагне викликів.

Зараз ми в пошуку
PHP/Go Backend Engineer.
Виклики, які чекають на цій ролі:

• Розвивати backend-логіку для карткових оплат і альтернативних платіжних методів.
• Працювати з інтеграціями з платіжними провайдерами та нестандартними сценаріями їхньої роботи.
• Покращувати успішність оплат
• Робити платіжні процеси стабільнішими, швидшими й прозорішими через якісне логування, моніторинг, метрики та автоматизацію
• Долучатися до технічних рішень у критичній частині продукту та брати відповідальность за їхню якість

Яку людину ми шукаємо:

• Береш відповідальність за результат і ведеш фічу повним циклом: від ідеї до стабільної роботи, моніторингу й підтримки
• Бачиш за технічними задачами бізнес-потребу та пропонуєш рішення, що справді її закривають;
• Самостійно занурюєшся в контекст, ухвалюєш обґрунтовані рішення й умієш пояснити команді, чому обрано саме такий підхід;
• Маєш сильний практичний досвід з PHP і готовий посилювати сервіс та команду своєю експертизою;
• Сприймаєш архітектуру як щоденний інструмент для створення надійних, зрозумілих і масштабованих рішень.

Буде перевагою:

• Досвід у payments, fintech, e-commerce або інших high-load системах
• Досвід роботи з observability: метрики, алерти, моніторинг
• Досвід розробки на GoLang
• Досвід повноцінної інтеграціії платіжних методів
• Участь у технічних ініціативах: покращенні процесів, стандартів розробки та архітектури.

У SKELAR ми побудували середовище для професійної самореалізації:

• SKELAR Platform. Це операційне ядро венчур-білдера, що допомагає фаундерам швидше проходити шлях від нуля до одиниці. Так команди бізнесів фокусуються на продукті — а 10+ команд в складі Platform закривають функції Legal, Finance, HR, Admin, Talent Acquisition, Employer Branding, IT та інші.
• Нетворк та обмін досвідом як частина культури. Серед наших колег — кофаундери, які запустили не один бізнес, а також найсильніші спеціалісти на ринку. Тож ми маємо доступ до необхідної експертизи на відстані витягнутої руки.
• Ексклюзивна доменна освіта. Ми створили власні навчальні програми для тіммейтів на вибір — від 2-місячної школи для менеджерів-початківців до інтенсивів про AI та професійних клубів з розробки, продакт-менеджменту тощо.
• Вплив на системну допомогу Україні. Маємо благодійний фонд SKELAR foundation, який створили самі скеларівці — і завдяки кожному співробітнику втілюємо важливі соціальні проєкти. Наприклад, заснували перший у Європі акселератор для ветеранів і формуємо майданчик для підтримки ветеранів на рівні держави.
• Екосистема для продуктивної роботи. Для скеларівців створені простори, які надихають на результат — з власним спортзалом, скеледромом, зеленими зонами Bali та бібліотеками. У спейсах, де сервіс, безпека та комфорт синхронізовані з темпом зростання команд, отримуємо вау-досвід та працюємо ефективніше.
• Турбота про щоденний комфорт. Сніданки, обіди, доступ до спортивних тренувань в Києві або часткова компенсація занять у Варшаві, медичне страхування, оплачувані відрядження, якщо специфіка ролі передбачає такі поїздки, корпоративні знижки від партнерів.

Більше розповімо на нашій зустрічі-знайомстві.

Запрошуємо будувати
the next big everything
у SKELAR разом!

We power people’s progress.
At Preply, we’re all about creating life-changing learning experiences. We help people discover the magic of the perfect tutor, craft a personalised learning journey, and stay motivated to keep growing. Our approach is human-led, tech-enabled - and it’s creating real impact.

We’ve just reached unicorn status with a $150M Series D, accelerating our vision to transform education through human-led, AI-enhanced learning. Today, 100,000+ tutors teach 90+ languages to learners in 180 countries - and we’re only getting started. As a category-defining company, we’re shaping what the future of learning looks like at global scale.

Every Preply lesson sparks change, fuels ambition, and drives progress that matters. Joining Preply means helping define the future of education at global scale, and building something that truly matters for millions of people, every day.

Meet the team!
Our team builds scalable, resilient products using Python/Django on the backend and React on the frontend, all with one goal in mind: creating a smooth, meaningful experience for our learners and tutors.

We're proudly tech-agnostic, great engineers come from all kinds of backgrounds. Whether you’ve worked with Java/Spring, Node.js, Ruby on Rails, Scala/Play, PHP, or Go, you’ll feel right at home here. Python experience isn’t required.

We make decisions based on data and real user feedback: running A/B tests, shipping iteratively, and constantly improving. We also put a strong focus on observability, monitoring, and metrics, so we can keep our systems healthy and continue optimizing at scale.

At Preply, we ship 50–60 times per day, thanks to a solid CI/CD setup and a culture that values action over ceremony. As a fast-growing company, you’ll find a wide range of technical challenges (we even write about many of them on our Engineering Blog!), the kind of work that keeps you learning, stretching, and growing.

We’ve reached 90%+ adoption of AI coding tools across engineering, and we’re now moving towards more autonomous, AI-Augmented development at scale. At Preply, engineers have direct access to the best tools available, with the freedom to use them fully and experiment as they build.

What You’ll Be Doing
You will work in a cross-functional team alongside Product Managers, Product Designers, UX Writers, Data Analysts, Engineering Managers, Engineers, and other stakeholders to deliver meaningful outcomes for learners and tutors. As a Senior Full Stack Engineer, you will combine hands-on execution with technical leadership, helping shape both product direction and engineering excellence through initiatives that drive customer and business impact, including, but not limited to:

• Back-end Development: Develop and own backend features using Python/Django, supporting the creation of new backend services as well as design, create, and/or troubleshoot integrations with third-party vendors.;
• UI Development: Develop and evolve frontend experiences in React/Typescript, contributing to experimentation frameworks and helping establish frontend engineering best practices;
• Implementation & Ownership: Lead complex initiatives from discovery through deployment, taking ownership of solutions throughout their lifecycle and balancing immediate product needs with long-term sustainability;
• Raising the Bar: Drive engineering excellence through mentorship, architectural reviews, and the adoption of best practices across frontend and backend development;
• Data-Driven Product Development: Partner closely with Product, Data, and UX teammates to identify opportunities, validate hypotheses, and maximize customer value through experimentation and measurable outcomes;
• System Design: Shape architectural direction for complex systems, making technical decisions that improve scalability, reliability, maintainability, and developer productivity;
• Prioritisation & Decision-Making: Navigate ambiguity, evaluate trade-offs, and align technical investments with business objectives and customer impact;
• Technical Leadership: Influence technical direction beyond your immediate scope, collaborating with engineers, managers, and stakeholders to drive alignment and successful delivery;
• Chasing Excellence: Continuously raise the quality bar through craftsmanship, curiosity, continuous learning, and a commitment to helping others grow.

What You Need To Succeed

• Full-Stack Expertise: This is a backend-heavy full-stack role, with approximately 60% of the work focused on backend development and 40% on frontend development;
• AI Expertise: Deep, hands-on expertise in Agentic AI. Able to redesign how the team builds software across the full SDLC, not just code generation. Builds reusable AI assets that your team can adopt, and delegates reasoning-heavy work while reserving judgment for architecture, business logic, and security. You set up the AI quality gates and you challenge existing engineering workflows and propose AI-based alternatives.
• Scalable Systems & Architecture: Experience designing and evolving large-scale web applications, including well-designed APIs, distributed systems, high-volume data flows, and scalable architectural patterns. Ability to make sound technical trade-offs that balance short-term delivery with long-term sustainability;
• Technical Leadership: Demonstrated ability to influence technical decisions, drive engineering best practices, and contribute to architectural direction within your team;
• Product & Business Impact: Strong product mindset with the ability to translate ambiguous business challenges into scalable technical solutions, using experimentation, data, and customer insights to guide decisions;
• Proactive Problem-Solving: Comfortable navigating ambiguity and independently solving complex technical and product challenges, while knowing when to engage others to maximize impact;
• Ownership & Accountability: High level of self-organization, ownership, and responsibility, with a track record of driving initiatives from concept through delivery and measurable outcomes;
• Collaboration & Communication: Excellent collaboration, stakeholder management, and communication skills, with the ability to work effectively across engineering, product, design, and data functions. English level B2 or higher;
• Engineering Excellence: Experience working in a cross functional team, contributing to code and design reviews, and helping raise the engineering bar through knowledge sharing and technical leadership;
• Operational Excellence: Understanding of observability, reliability, monitoring, and operational best practices, with willingness to participate in your squad’s on-call rotation (1 week every 5 weeks);

Why you’ll love it at Preply

• An open, collaborative, dynamic and diverse culture;
• A generous monthly allowance for lessons on Preply.com, Learning & Development budget and time off for your self-development;
• A competitive financial package with equity, leave allowance and health insurance;
• Not in Barcelona? We offer an attractive relocation package to join us in our Preply Barcelona Hub;
• Access to free mental health support platforms;
• Access to Gympass-partnered wellness and gym centers throughout Spain to promote and support well-being and physical health;
• The opportunity to shape the lives of learners and tutors through language learning and teaching in 175 countries (and counting!).

Our Principles

• Care to change the world - We are passionate about our work and care deeply about its impact to be life changing.
• We do it for learners - For both Preply and tutors, learners are why we do what we do. Every day we focus on empowering tutors to deliver an exceptional learning experience.
• Keep perfecting - To create an outstanding customer experience, we focus on simplicity, smoothness, and enjoyment, continually perfecting it as every detail matters.
• Now is the time - In a fast-paced world, it matters how quickly we act. Now is the time to make great things happen.
• Disciplined execution - What makes us disciplined is the excellence in our execution. We set clear goals, focus on what matters, and utilize our resources efficiently.
• Dive deep - We leverage business acumen and curiosity to investigate disparities between numbers and stories, unlocking meaningful insights to guide our decisions.
• Growth mindset - We proactively seek growth opportunities and believe today's best performance becomes tomorrow's starting point. We humbly embrace feedback and learn from setbacks.
• Raise the bar - We raise our performance standards continuously, alongside each new hire and promotion. We build diverse and high-performing teams that can make a real difference.
• Challenge, disagree and commit - We value open and candid communication, even when we don’t fully agree. We speak our minds, challenge when necessary, and fully commit to decisions once made.
• One Preply - We prioritize collaboration, inclusion, and the success of our team over personal ambitions. Together, we support and celebrate each other's progress.

Diversity, Equity, and Inclusion
Preply.com is committed to creating an inclusive environment where people of diverse backgrounds can thrive. We believe that the presence of different opinions and viewpoints is a key ingredient for our success as a multicultural Ed-Tech company. That means that Preply will consider all applications for employment without regard to race, color, religion, gender identity or expression, sexual orientation, national origin, disability, age or veteran status.