Lengin

We’re looking for a Full-Stack Developer who’s ready to grow into an AI Solution Tech Lead within the next 6 months. You won’t just write code — you’ll work hands-on with AI frameworks, agents, LLM tools, and bleeding-edge technologies, building prototypes for client presales, solving complex technical challenges, and driving tasks to completion even when the brief is incomplete and deadlines are tight.
 

💡 This position is open exclusively to Ukrainian professionals, regardless of their current country of residence.
 

You’re the one if you:

• Can quickly dive into new technologies and apply them hands-on.
• Love experimenting with AI agents, prompt engineering, and the latest tools (OpenAI, Anthropic, LangChain, LlamaIndex, Hugging Face, etc.).
• Find creative solutions independently and deliver results without waiting for perfect specs.
• Communicate clearly with both the team and clients.
• Hold high standards for your work and always look for ways to make things smarter and cleaner.
   

What you’ll do:

• Build full-stack + AI prototypes (MVPs/PoCs) for clients under tight deadlines.
• Integrate LLMs and AI frameworks into real business use cases (chatbots, automation, search, data enrichment, etc.).
• Work hands-on with vector databases, embeddings, RAG pipelines, and multimodal models.
• Solve complex technical challenges and find creative ways to turn abstract ideas into working solutions.
• Collaborate on solution architecture and contribute to technical decision-making.
• Participate in presales, showcasing your prototypes and ideas to clients.
• Grow step-by-step into a Tech Lead role, taking ownership of AI-driven projects and mentoring others.
   

What we expect:

• 4+ years of experience in full-stack development (Python + React/Next.js).
• Practical experience or strong curiosity in AI/ML frameworks (LangChain, PyTorch, TensorFlow, Hugging Face, LlamaIndex, or similar).
• Understanding of cloud environments (AWS, GCP, Azure).
• Ability to learn fast and stay on top of new AI tools and trends (OpenAI APIs, Anthropic Claude, Ollama, Mistral, etc.).
• English: B2+
   

What we offer:

• Work on projects at the intersection of AI and business, where your impact is real.
• Freedom to choose technical solutions and implement new approaches.
• A high-standards team that values initiative, ownership, and innovation.
• Flexible schedule and projects that will level up your skills faster than any course.

We’re looking for a Project Manager who not only delivers results but also enjoys building trust, structure, and great collaboration within the team. This role focuses on optimizing processes, promoting effective teamwork, and driving long-term business value.
It’s also a growth opportunity — we’re looking for someone ready to evolve into a Delivery manager role, build and lead a project management team, and shape the delivery direction of the company. Please note that this position is open exclusively to Ukrainian professionals, regardless of their current country of residence.

What We Expect From You:

• minimum of 3 years in a role such as Project Manager (PM);
• technical background: experience in QA or engineers’ positions;
• high proficiency in English (Upper-Intermediate level or above) for client communication;
• proficiency in Agile (Scrum, Kanban), Waterfall, or hybrid methodologies;
• hands-on experience with project management tools such as Jira, Trello, MS Project, and Asana;
• proven skills in building long-term partnerships and experience working with international clients;
• strong understanding of SDLC, modern technologies, and development processes;
• ability to quickly assess situations, propose effective solutions, and implement them efficiently;
• ability to manage financials (including budget creation and cost control) and revenue forecasting;
• experience in managing client relationships and expectations;
• leadership skills with the ability to manage and mentor teams;
• strong decision-making and consensus-building abilities.

Preferred Qualifications:

• PMP, PSM, SAFe, or equivalent certifications.
   

Your Key Responsibilities:

• overseeing the full lifecycle of IT solution delivery, including planning, execution, monitoring, and project completion;
• ensuring project deliverables align with client expectations and adhere to company quality standards;
• coordinating and optimizing the work of cross-functional teams (developers, QA engineers, designers, etc.) to ensure seamless collaboration;
• building and maintaining strong client relationships through effective communication, requirements gathering, and ongoing support;
• managing project timelines, budgets, and quality benchmarks to deliver successful outcomes;
• identifying potential risks and implementing proactive mitigation strategies;
• contributing to presales activities, including project scoping and client consultations.

Why join us?

We believe great results come from trust, clarity, and ownership — that’s why every team member has a real impact on how we grow and deliver.

Here’s what you can count on:

• professional and personal growth: we support development through new challenges, mentorship, and learning opportunities.
• competitive compensation, always paid on time.
• real influence: your ideas matter — help us improve internal processes and shape the way we work.
• transparent performance reviews and regular salary evaluations.
• long-term partnership built on respect and reliability.
• flexible schedule and a healthy work-life balance.
• 18 paid vacation days, 5 paid sick days, and days off on official Ukrainian holidays.
• plus, a few extra perks to make your work more comfortable and rewarding.

If this sounds like your kind of challenge — let’s talk!

We’re looking for a skilled Full-Stack Developer to maintain and enhance a production web app used for an automated handwriting and fulfillment system integrating hardware control (AxiDraw plotters), web services, and distributed infrastructure hosted on DigitalOcean.
 

About the Role

This is a part-time, long-term collaboration — around 10–15 hours per week. It’s a great opportunity for someone who already works on a stable project and wants to earn extra income while contributing to a technically interesting, well-structured system. Please note that this position is open exclusively to Ukrainian professionals, regardless of their current country of residence.
 

Key Responsibilities:

• Maintain and improve the existing production system
• Develop new features and optimize performance
• Handle deployments, database migrations, and system monitoring
• Ensure platform stability and scalability
   

Tech Stack:

• Backend: Python 3.10+, FastAPI, SQLAlchemy, WebSockets, Redis
• Frontend: React 18+, Material UI, Redux Toolkit, Vite
• Database & DevOps: MySQL 8, Docker, Linux (Ubuntu), Nginx, DigitalOcean
• Infrastructure: Terraform, Ansible (nice to have)
• Other: Stripe API, Alembic, Playwright, Mailgun, SVG manipulation
   

Requirements:

• 5+ years of full-stack development experience
• Strong expertise in Python/FastAPI and React/Redux
• Experience maintaining production systems and real-time apps
• Solid understanding of DevOps and infrastructure management
   

Nice to Have:

• Hardware/IoT integration experience
• Stripe, Redis, Terraform, Ansible
• Testing (pytest, Playwright)