Solid Software

We are looking for a Senior Python Developer who is ready to scale and grow with us.
 

If you’re passionate about clean code, scalable backend architecture, and excited to build something impactful, we’d love to meet you!
 

What will you do?
 

• Contribute to the full backend lifecycle, from architecture design to production deployment;
• Design, develop, and maintain RESTful APIs using Python, Flask, FastAPI, and SQLAlchemy;
• Implement microservices architecture with message brokers and API gateways;
• Implement authentication and authorization with industry-standard encryption and access control;
• Optimize backend services for performance and efficiency, identifying bottlenecks and implementing solutions to improve response times and resource utilization;
• Implement complex algorithms and data structures to handle data processing, operations research (OR), recommendation systems, and optimization problems;
• Deploy and scale services on GCP (Cloud Functions, Cloud Run, Kubernetes); containerize with Docker;
• Design and optimize database schemas using PostgreSQL/MySQL and integrate Pandas/NumPy for analytics and ML;
• Document API specifications using OpenAPI (formerly Swagger);
• Collaborate with frontend, data science, and DevOps teams to align backend with product goals;
• Maintain engineering standards through code reviews, documentation, and knowledge sharing.
 

Requirements:

• 7+ years of commercial experience in backend development with Python;
• Upper-Intermediate English (B2 or C1) for comfortable verbal team communication.
• Strong hands-on experience with Python, Flask, and SQLAlchemy, Pandas, NumPy;
• Proficiency with Docker and Kubernetes;
• Expertise in software architecture and design patterns, with a proven track record of solving complex technical and performance problems;
• Strong understanding of algorithmic complexity, optimization techniques, and best practices for designing efficient algorithms to solve complex problems;
• Proven ability to handle complex, loosely defined business logic and structure intricate processes cleanly;
• Solid grasp of software architecture and design patterns, with a track record of solving complex technical and performance problems;
• Autonomous in architectural decision-making, comfortable owning hard problems end to end;
• Bonus points if you’ve worked in medical or sports domains.

Why Solid Software?
 

• We support Ukraine;
• A wonderful team of enthusiasts and like-minded people;
• Atmosphere of comfortable work & life balance;
• Flexible schedule and work-from-home opportunity;
• Opportunity to work on projects with different directions (web, mobile, tablet, watch, desktop);
• MacBook Pro and great tech;
• Decent compensation;
• Lack of bureaucracy;
• Compensation for professional events, sports activities;
• Corporate online parties and fun team-buildings;
• Anniversary and birthday presents.
 

Professional growth:
 

• Onboarding and mentorship program with a dedicated onboarding guide built by our team;
• Internal Career Path program from Developer to Architect that consists of knowledge areas for IT specialists, books, training sessions, and work activities;
• Corporate library with the best programming books (+ an ability to order a particular book if we don’t have it);
• Professional and constant feedback.
 

We truly value the unique talents and skills that each individual brings to our company. As we continue on our journey of growth, we eagerly anticipate the opportunity to welcome you into our team.
 

Apply now and help us shape what comes next!

Solid Software is looking for a Lead Generation Specialist who is eager to learn, grow, and achieve real results.

You’ll help us identify the right prospects, build meaningful connections, experiment with different outreach approaches, and turn conversations into new business opportunities. We’re looking for someone curious, proactive, creative, ambitious, and ready to develop their lead generation skills with us.
 

What will you do? 
 

• Searching for potential leads on LinkedIn or other supporting channels;
• Building and maintaining prospect lists;
• Contacting potential leads via LinkedIn and managing follow-ups;
• Maintaining and keeping records within a CRM;
• Tracking and analyzing LinkedIn outreach results;
• Testing new approaches to improve lead generation results.

Requirements: 
 

• Up to 1 year experience with lead generation (B2B lead generation, ICP & buyer persona research, contact discovery, list building);
• Strong written and verbal English;
• Good understanding of the IT market, lead generation tactics, and best practices;
• Familiar with Apollo.io, Hunter.io, LinkedIn Sales Navigator, web scrapers, or similar platforms;
• Understanding of LinkedIn as a professional networking platform;
• Experience with data and email verification, data cleaning & hygiene;
• Confident with Excel/ Google Sheets (filtering, VLOOKUP/pivot basics) and Google Docs;
• Interested in AI and hands-on with AI tools (ChatGPT, Claude, Gemini, Grok, DeepSeek): prompt engineering, AI-driven prospecting, localized messaging;
• Willingness to learn, take relevant courses, and follow new trends;
• Ambition and strong desire to achieve results;
• Responsible and attentive approach to work, follow-ups, and CRM (KeepinCRM);
• Understanding of other outreach channels (e.g., Meta Business Suite) would be a plus.

Why Solid Software?
 

• We support Ukraine;
• A wonderful team of enthusiasts and like-minded people;
• Atmosphere of comfortable work & life balance;
• Flexible schedule and work-from-home opportunity;
• Opportunity to work on projects with different directions (web, mobile, tablet, watch, desktop);
• MacBook Pro and great tech;
• Decent compensation;
• Lack of bureaucracy;
• Compensation for professional events, sports activities;
• Corporate online parties and fun team-buildings;
• Anniversary and birthday presents.

Professional growth:
 

• Build a long-term Career Path with desired knowledge areas, training sessions, and work activities;
• Great opportunity for a candidate willing to gain their first commercial experience, but who is results-driven and ready to work hard & learn to achieve results; 
• Corporate library with best professional books (+ an ability to order a particular book if we miss it);
• Professional and constant feedback. 

We truly value the unique talents and skills that each individual brings to our company. As we continue on our journey of growth, we eagerly anticipate the opportunity to welcome you into our team.

Apply now and help us shape what comes next!

Solid Software is looking for a self-driven Software Architect to design and deliver scalable, high-quality solutions across APIs, data pipelines, cloud infrastructure, and AI services. You’ll bring deep Python expertise and enough frontend knowledge to guide Flutter development and shape client-side architecture.

What will you do?

• Own the architecture of backend services and ensure their seamless integration with mobile and web applications.
• Lead technical design reviews and make architectural decisions across backend services, frontend applications, and infrastructure.
• Design scalable, resilient, cloud-native systems that support AI-driven coaching experiences and evolving product requirements.
• Break down complex technical and business requirements into independent, manageable tasks that can be implemented and delivered incrementally.
• Collaborate with frontend developers, data scientists, and DevOps engineers to integrate backend services with applications, AI models, and cloud infrastructure.
• Provide technical leadership and mentorship to engineers across disciplines, helping maintain consistent engineering practices and architectural standards.
• Design and optimize PostgreSQL or MySQL schemas to support performance, scalability, and data integrity.
• Implement reliable database session management for high-concurrency environments, using SQLAlchemy or an equivalent ORM while ensuring thread safety.
• Apply dependency injection and modular design principles to improve code testability, maintainability, and separation of concerns.
• Identify performance bottlenecks and optimize backend services, database queries, and system architecture to improve scalability and reliability.
• Containerize backend services using Docker, orchestrate deployments with Kubernetes, and support production workloads on cloud platforms.
• Leverage Google Cloud Platform (GCP) and cloud-native technologies to deploy, operate, and scale services.
• Document APIs using OpenAPI/Swagger to support clear and consistent integration for internal and external consumers.

Requirements:

• 10+ years of experience in software engineering, including at least 5 years designing production-scale systems.
• Upper-Intermediate English (B2 or C1) for comfortable verbal communication within an international team.
• A Master's degree in Computer Science, Software Engineering, or a related field.
• Ability to evaluate architectural trade-offs involving scalability, reliability, maintainability, and cost, and make well-reasoned technical decisions.
• Strong communication, technical leadership, and mentoring skills, with the ability to collaborate effectively across engineering and product disciplines.
• Extensive Python backend development experience, including hands-on experience with Flask or FastAPI.
• Strong knowledge of SQLAlchemy or an equivalent ORM, particularly database session management for high-concurrency, thread-safe applications.
• Practical experience with dependency injection, modular architecture, and maintainable code design.
• Experience designing scalable database schemas and optimizing SQL queries for performance and data integrity.
• Production experience with Docker and Kubernetes for containerization and service orchestration.
• Hands-on experience with cloud platforms and cloud-native technologies, preferably Google Cloud Platform (GCP).
• A self-driven, detail-oriented approach to problem-solving, with the ability to work independently and make sound technical decisions with minimal supervision.
• Familiarity with Pandas and NumPy for data analytics or machine learning-related tasks.
• Experience with mobile application development or architecture is a strong advantage.

Why Solid Software?

• We support Ukraine; 
• A wonderful team of enthusiasts and like-minded people;
• Atmosphere of comfortable work & life balance;
• Flexible schedule and work-from-home opportunity;
• Opportunity to work on projects with different directions (web, mobile, tablet, watch, desktop);
• MacBook Pro and great tech;
• Decent compensation;
• Lack of bureaucracy;
• Compensation for professional events, sports activities;
• Corporate online parties and fun team-buildings;
• Anniversary and birthday presents.

Professional growth:

• Onboarding and mentorship program with a dedicated onboarding guide built by our team;
• Internal Career Path program from Developer to Architect that consists of knowledge areas for IT specialists, books, training sessions, and work activities;
• Corporate library with the best programming books (+ an ability to order a particular book if we don't have it);
• Professional and constant feedback.

We truly value the unique talents and skills that each individual brings to our company. As we continue on our journey of growth, we eagerly anticipate the opportunity to welcome you into our team. 

Apply now and help us shape what comes next!

Solid Software is looking for an AI Software Architect/ Senior AI Engineer to design and deliver production-grade solutions powered by LLMs. The role requires deep expertise in architecting, building, and operating complex AI systems: RAG, agentic workflows, tool calling, evaluation frameworks, and observability platforms.

The ideal candidate pairs strong software engineering fundamentals with a track record of shipping real-world AI products. Beyond experimentation, you can design scalable, reliable, and cost-effective LLM solutions that run successfully in production, with a solid grasp of modern AI architecture patterns, prompt engineering, retrieval systems, and agent orchestration.

What will you do?
 

• Own the architecture of AI-powered services and ensure their effective integration with backend, mobile, and web applications.
• Design, build, and maintain production-grade LLM applications using modern AI frameworks and orchestration platforms.
• Lead technical design reviews and drive architectural decisions across AI services, backend systems, data pipelines, and cloud infrastructure.
• Design and implement agentic workflows involving tool use, function calling, multi-agent systems, planning, memory management, and reasoning chains.
• Design and optimize RAG architectures using vector databases, embeddings, document processing pipelines, and retrieval optimization techniques.
• Establish evaluation frameworks to assess AI quality, reliability, latency, cost, and business impact, including benchmarking and automated quality assessment.
• Implement AI observability and monitoring using tools such as Langfuse, LangSmith, OpenTelemetry, and similar platforms.
• Optimize prompts, retrieval strategies, model selection, and system architecture to improve accuracy, performance, reliability, and cost efficiency.
• Design scalable APIs and services that expose AI capabilities to internal and external applications, and deploy them on cloud platforms, primarily Google Cloud Platform (GCP).
• Collaborate with software engineers, data scientists, product managers, and domain experts to translate business requirements into practical AI solutions.
• Define AI engineering standards, best practices, and governance processes to support the development and maintenance of reliable AI systems.
• Mentor engineers working on AI initiatives and contribute to architectural decisions and technical direction.
• Document AI architectures, workflows, evaluation methodologies, and operational procedures to ensure maintainability and knowledge sharing.

Requirements:
 

• 10+ years of software engineering experience, including 5+ years building LLM-based and generative AI solutions in production.
• Upper-Intermediate English (B2 or C1) for comfortable verbal communication within an international team.
• A Master's degree in Computer Science, Artificial Intelligence, Machine Learning, Software Engineering, or a related field.
• Strong Python development experience and software engineering fundamentals.
• Hands-on experience with AI orchestration frameworks such as LangGraph, LangChain, LlamaIndex, CrewAI, or equivalent technologies.
• Practical experience designing and implementing agentic systems involving tool use, function calling, planning, memory management, and multi-agent workflows.
• Strong expertise in RAG architectures, vector databases, embeddings, prompting strategies, context management, and retrieval techniques.
• Experience with AI evaluation and observability tools such as Langfuse, LangSmith, or similar platforms, including benchmarking, monitoring, and automated quality assessment.
• Experience working with structured and unstructured data pipelines and databases, including PostgreSQL, vector databases, and document stores.
• Production deployment experience with Docker, Kubernetes, cloud platforms, and CI/CD pipelines.
• Ability to evaluate architectural trade-offs involving model performance, latency, reliability, maintainability, and cost.
• Strong communication, technical leadership, and mentoring skills, with the ability to collaborate effectively across engineering, data, and product teams.
• Experience with mobile application development or architecture is a strong advantage.

Nice to have:

• Experience working with commercial and open-source models, including OpenAI, Anthropic, Gemini, Llama, and Mistral, as well as fine-tuning techniques.
• Experience in regulated, privacy-sensitive, or high-availability environments.
• Experience integrating AI capabilities into mobile and web applications.
• Familiarity with synthetic data generation and model optimization techniques.

Why Solid Software?

• We support Ukraine; 
• A wonderful team of enthusiasts and like-minded people;
• Atmosphere of comfortable work & life balance;
• Flexible schedule and work-from-home opportunity;
• Opportunity to work on projects with different directions (web, mobile, tablet, watch, desktop);
• MacBook Pro and great tech;
• Decent compensation;
• Lack of bureaucracy;
• Compensation for professional events, sports activities;
• Corporate online parties and fun team-buildings;
• Anniversary and birthday presents.

Professional growth:

• Onboarding and mentorship program with a dedicated onboarding guide built by our team;
• Internal Career Path program from Developer to Architect that consists of knowledge areas for IT specialists, books, training sessions, and work activities;
• Corporate library with the best programming books (+ an ability to order a particular book if we don't have it);
• Professional and constant feedback.

We truly value the unique talents and skills that each individual brings to our company. As we continue on our journey of growth, we eagerly anticipate the opportunity to welcome you into our team. 

Apply now and help us shape what comes next!