Senior Software Engineer (Full Stack Enterprise)

🏢 Summary: Opportunity to design and develop real-time embedded software powering autonomous, high-speed metal 3D printing systems in a production-scale environment. The role focuses on hardware control, high-speed data acquisition, computer vision integration, and automation, working across embedded Linux, control algorithms, and high-performance compute systems. This is a full-time onsite position contributing to scalable, robust software for advanced manufacturing systems. 🗂️ Requirements: Bachelor’s degree in Computer Science, Computer Engineering, Electrical Engineering, Applied Mathematics, or related field, 2+ years of professional post-graduation experience in C/C++ software development, Experience in real-time embedded system design, Experience working with Linux OS, Ability to work full-time onsite 📃 Skills: C, C++, Linux, FPGA, GPU, PCIe, Rust, Embedded, ComputerVision, Automation, Robotics, IP, Drivers 🏢 Description: Freeform builds AI-native manufacturing systems that unify software, hardware, and physics to produce industrial-scale parts at the speed of human ideation. By treating manufacturing as a single integrated system, complex hardware is designed, built, and scaled without limits. As an Embedded Software Engineer, you will contribute to the architecture of critical embedded software systems that enable advanced metal 3D printing factories to operate autonomously at high speeds with precision. This includes developing software solutions for hardware control and autonomy, high-speed data acquisition, and custom high-performance compute systems. Projects vary across the stack, requiring flexibility and a mission-first mindset. 3D printing experience is not required; the role seeks motivated, collaborative engineers who enjoy solving complex technical problems. Responsibilities: - Contribute to the architecture of state-of-the-art software for a production-scale metal 3D printing system - Design and develop the machine instruction interface to printing system hardware - Develop software for computer vision systems, sensor monitoring, calibration, quality data logging, and system health tracking - Integrate control algorithms into production software with process and control engineers - Collaborate with FPGA developers to build high-speed data acquisition software - Create software for collection and analysis of process data - Implement production automation solutions - Develop, unit test, and deploy scalable, robust, and maintainable software - Generate and maintain documentation for software and integrated systems Basic Qualifications: - Bachelor’s degree in computer science, computer engineering, electrical engineering, applied mathematics, or related field - 2+ years of professional, post-graduation experience in C/C++ software development - Experience in real-time embedded system design with Linux OS Nice to Have: - Experience in high-performance compute environments (FPGAs or GPUs) - Experience with PCIe driver development and troubleshooting - Experience with Rust - Experience with high-speed data acquisition and real-time closed-loop control systems - Strong knowledge of OS coding techniques, IP protocols, interfaces, and hardware subsystems - Experience developing software for industrial automation systems or robotics - Strong written and verbal communication skills Location: Based in Hawthorne, the vertically integrated facility combines technology development, R&D, and production under one roof. This role requires full-time onsite presence (five days a week) with very limited exceptions. What We Offer: - Inclusive and collaborative culture focused on learning and data-driven decisions - Opportunity to be an early and integral member of a rapidly growing company Benefits: - Significant stock option packages - 100% employer-paid Medical, Dental, and Vision insurance (PPO and HMO options) - Life insurance - Traditional and Roth 401(k) - Relocation assistance - Paid vacation, sick leave, and company holidays - Generous paid parental leave and extended transition back to work - Free daily catered lunch and dinner, fully stocked kitchenette - Casual dress, flexible work hours, and team building events Compensation: In addition to stock options, the estimated salary range for this role is $115,000–$145,000. The final offer is based on experience, education, and demonstrated skills, with the upper end reserved for exceptional domain expertise and impact.

🏢 Summary: Lead Applications Engineer role serving as the primary technical interface for semiconductor equipment customers, translating complex fabrication system requirements into manufacturable hardware solutions. The position drives deep technical engagements across wafer handling, vacuum systems, thermal management, and precision components, guiding applications from feasibility through production. The role shapes deployment of advanced manufacturing technology within high-performance semiconductor environments. 🗂️ Requirements: Bachelor’s degree in Engineering or related technical field, 5+ years experience in semiconductor equipment or fabrication industry, Strong systems-level understanding of complex mechanical hardware, Experience with semiconductor fabrication systems and equipment, Ability to lead technical discussions on manufacturability, materials, tolerances, and production constraints, Experience translating system requirements into manufacturable designs 📃 Skills: Semiconductor, Fabrication, Mechanical, Systems, UHV, Thermal, Robotics, Lithography, Optics, Manufacturing, Additive, Casting, Forging, Machining, DFM 🏢 Description: LEAD APPLICATIONS ENGINEER (SEMICONDUCTOR MACHINERY) Freeform builds AI-native manufacturing systems that unify software, hardware, and physics to produce industrial-scale parts at the speed of human ideation. By treating manufacturing as a single integrated system, we unlock a new era of innovation where complex hardware is designed, built, and scaled without limits. Freeform is hiring a Lead Applications Engineer to serve as the primary technical interface between Freeform and a portfolio of our semiconductor customers. This person will apply their technical background and intimate understanding of semiconductor fabrication systems and equipment to translate real engineering problems into manufacturable solutions that only Freeform's technology can unlock. You will own the technical relationship with customers, guide them through application discovery and feasibility, and help shape how Freeform's manufacturing platform is deployed across some of the most ambitious programs in the industry. The ideal candidate comes from a strong engineering background, understands complex semiconductor systems, and is comfortable engaging directly with senior engineers and decision makers at highly sophisticated and cutting-edge organizations. This person should be comfortable leading deep technical discussions across performance, manufacturability, materials, qualification, and production tradeoffs, and translating those conversations into a broader, programmatic vision that helps customers understand how Freeform's technology can unlock entirely new design and production possibilities. Responsibilities: Serve as the primary technical point of contact for a portfolio of strategic semiconductor equipment customers Lead deep technical discussions with customer engineering teams across applications such as: Wafer handling, robotic end-effectors, and vacuum-compatible armatures Thermal management hardware and high-precision cold plates Ultra-high vacuum (UHV) chambers and internal components Gas delivery manifolds and high-purity fluid systems Lithography tool structural components and precision optics mounts Pedestals and showerhead assemblies for deposition tools Develop a deep understanding of customer system requirements, constraints, and performance drivers Translate customer needs into manufacturable solutions using Freeform's technology, including geometry, materials, tolerances, and production considerations Clearly articulate what Freeform's manufacturing platform can and cannot deliver, including tradeoffs and constraints Independently answer advanced technical questions related to materials, processes, qualification pathways, and production scalability Identify where Freeform's technology enables new designs, architectures, or performance regimes that were previously impractical or impossible Work closely with internal engineering and operations teams to align on feasibility, execution, and roadmap - but without depending on them for basic technical credibility Guide customers through early application exploration, development phases, and transition into production Build long-term, trust-based technical relationships with customer engineers, program managers, and technical leadership Provide feedback from the field to influence Freeform's product, process, and roadmap decisions Basic Qualifications: Bachelor's degree in engineering or similar technical discipline 5+ years of experience in an engineering, program management, or leadership role within the semiconductor equipment/fabrication industry Strong systems-level understanding of complex mechanical hardware and how components function within larger assemblies Nice to Have: Prior experience in a customer-facing technical role such as applications engineering, systems engineering, or field engineering Ability to clearly communicate complex technical concepts to both engineering and non-engineering stakeholders Familiarity with metal manufacturing processes, including additive manufacturing, casting, forging, or advanced machining Experience supporting hardware through development, qualification, and production ramp Strong intuition for design-for-manufacturing and production scalability Strategic thinker with a strong business acumen Team player, positive attitude, growth mindset, integrity, accountability, adaptability, entrepreneurial, driven, results-oriented and ethical Location: Based in Hawthorne, our vertically integrated facility brings technology development, R&D, and production together under one roof. We operate at the center of LA's deep tech ecosystem, surrounded by some of the most ambitious hardware innovation happening anywhere in the country. Our fast-paced, cross-functional environment is built on close collaboration, and as such, this role requires full-time onsite presence (five days a week), with very limited exceptions. What We Offer: We have an inclusive and diverse culture that values collaboration, learning, and making deliberate data-driven decisions. We offer a unique opportunity to be an early and integral member of a rapidly growing company that is scaling a world-changing technology. Benefits Significant stock option packages 100% employer-paid Medical, Dental, and Vision insurance (premium PPO and HMO options) Life insurance Traditional and Roth 401(k) Relocation assistance provided Paid vacation, sick leave, and company holidays Generous Paid Parental Leave and extended transition back to work for the birthing parent Free daily catered lunch and dinner, and fully stocked kitchenette Casual dress, flexible work hours, and regular catered team building events Compensation As a growing company, the salary range is intentionally wide as we determine the most appropriate package for each individual taking into consideration years of experience, educational background, and unique skills and abilities as demonstrated throughout the interview process. Our intent is to offer a salary that is commensurate for the company's current stage of development and allows the employee to grow and develop within a role. In addition to the significant stock option package, the estimated salary range for this role is $120,000-$185,000. The upper end of the range is reserved for individuals who demonstrate exceptional experience, deep domain mastery, and a proven history of high performance and impact. Freeform is an Equal Opportunity Employer that values diversity; employment with Freeform is governed on the basis of merit, competence and qualifications and will not be influenced in any manner by race, color, religion, gender, national origin/ethnicity, veteran status, disability status, age, sexual orientation, gender identity, marital status, mental or physical disability or any other legally protected status.

🏢 Summary: Full Stack Engineer role building and scaling a mission-critical AI-native platform for defence logistics, integrating with legacy government and enterprise systems. The position involves end-to-end development across frontend, backend, and databases, with strong ownership and direct customer impact. Candidates will work in a fast-paced seed-stage environment with high accountability and real-world deployment exposure. 🗂️ Requirements: Experience shipping production software end-to-end, Strong proficiency in TypeScript, Strong proficiency in JavaScript, Experience with at least one frontend framework (React, Svelte, Next.js or similar), Solid knowledge of SQL databases, Experience designing database schemas and data models, Understanding of testing, documentation, and code review best practices, Ability to work in fast-moving, high-accountability environments 📃 Skills: TypeScript, JavaScript, React, Svelte, Next.js, SQL, PostgreSQL, APIs, ERP, Testing, Documentation, CodeReview 🏢 Description: ABOUT THE COMPANY We're building the AI-native command centre for defence logistics. The US defence industrial base — distributors and manufacturers managing billions of dollars in supply chain — still runs on infrastructure built in the 1980s, stitched together with email threads, supplier quotes, PDFs, government solicitations, and archaic ERP exports. We're changing that. Our platform eliminates the manual bottlenecks slowing down critical national security workflows, helping defence distributors and manufacturers quote faster, win more contracts, and deliver the components that keep allied defence forces operational. We're at seed stage, moving fast, and building a small core engineering team to scale the platform. ABOUT THE ROLE We're looking for a Full Stack Engineer to join the core platform engineering team and contribute directly to the development, scalability, and reliability of mission-critical software supporting defence and supply chain operations. You'll work closely with engineering leadership, founders, and customer-facing deployment teams to design, build, and maintain systems that integrate with complex legacy environments and support high-value, high-impact workflows. No two days will be the same — from integrating with legacy government interfaces to architecting dynamic workflows, the scope is wide and the stakes are real. Onboarding includes an on-site implementation. Expect late nights and direct customer pressure — everyone on the platform team goes through it, because experiencing forward-deployed reality is how you build software that actually works in the field. WHAT YOU'LL WORK ON Full-stack platform development Design, develop, and maintain full-stack application functionality across frontend interfaces, backend services and APIs, and database schemas and data models. Legacy system integrations Implement integrations with external systems including legacy government and enterprise platforms — ERPs, government procurement interfaces, and everything in between. Customer-driven feature delivery Collaborate with forward-deployed teams to translate customer requirements into production-ready features that drive measurable revenue outcomes for clients. Code quality and standards Ensure code quality through best practices, testing, documentation, and code reviews. Set the standard for customer-centric engineering excellence — code is a means to an end, and you build with that in mind. Team mentorship and onboarding Support the onboarding and technical development of new engineering team members as the team grows. WHAT WE LOOK FOR A track record of shipping Experience delivering real projects and products to production. You've owned things end-to-end and have the scars to show for it. TypeScript and JavaScript fluency Strong proficiency in TypeScript and JavaScript, plus solid experience with at least one frontend framework — React, Svelte, Next.js, or similar. SQL and database design Solid knowledge of SQL databases, preferably PostgreSQL. Comfortable designing schemas and reasoning about data models. Software engineering best practices Strong understanding of testing, documentation, code review, and the longer-term cost of shortcuts — while also knowing when pragmatic compromises are the right call. High accountability in fast-moving environments You set reliable deadlines and meet them. When millions of dollars depend on a delivery date, you treat that seriously — and you communicate clearly when something is at risk. THE TEAM A small, tight-knit engineering team working directly with founders and customer-facing deployment strategists. The structure is flat, the feedback is direct, and the work has real-world consequence. You'll have genuine ownership from day one — both in terms of equity and the code you're responsible for. COMPENSATION & BENEFITS Salary $75,000 – $150,000 depending on experience. Equity 0.05% – 0.3% real equity. A meaningful slice at seed stage. Work model Remote, based in Warsaw.

🏢 Summary: Full Stack Engineer role focused on building and scaling a mission-critical AI-native platform for defence logistics, integrating with legacy government and ERP systems. The position involves end-to-end development across frontend, backend, and databases, delivering customer-driven features in high-stakes environments. Engineers take ownership of production systems, ensuring scalability, reliability, and code quality. 🗂️ Requirements: Proven experience shipping production software end-to-end, Strong proficiency in TypeScript and JavaScript, Experience with at least one frontend framework (React, Svelte, Next.js or similar), Solid knowledge of SQL and database design, Experience with PostgreSQL, Ability to integrate with legacy and external enterprise systems, Understanding of testing, code reviews, and documentation practices, Ability to work in fast-paced, high-accountability environments 📃 Skills: TypeScript, JavaScript, React, Svelte, Next.js, SQL, PostgreSQL, APIs, ERP, Testing 🏢 Description: ABOUT THE COMPANY We're building the AI-native command centre for defence logistics. The US defence industrial base — distributors and manufacturers managing billions of dollars in supply chain — still runs on infrastructure built in the 1980s, stitched together with email threads, supplier quotes, PDFs, government solicitations, and archaic ERP exports. We're changing that. Our platform eliminates the manual bottlenecks slowing down critical national security workflows, helping defence distributors and manufacturers quote faster, win more contracts, and deliver the components that keep allied defence forces operational. We're at seed stage, moving fast, and building a small core engineering team to scale the platform. ABOUT THE ROLE We're looking for a Full Stack Engineer to join the core platform engineering team and contribute directly to the development, scalability, and reliability of mission-critical software supporting defence and supply chain operations. You'll work closely with engineering leadership, founders, and customer-facing deployment teams to design, build, and maintain systems that integrate with complex legacy environments and support high-value, high-impact workflows. No two days will be the same — from integrating with legacy government interfaces to architecting dynamic workflows, the scope is wide and the stakes are real. Onboarding includes an on-site implementation. Expect late nights and direct customer pressure — everyone on the platform team goes through it, because experiencing forward-deployed reality is how you build software that actually works in the field. WHAT YOU'LL WORK ON Full-stack platform development Design, develop, and maintain full-stack application functionality across frontend interfaces, backend services and APIs, and database schemas and data models. Legacy system integrations Implement integrations with external systems including legacy government and enterprise platforms — ERPs, government procurement interfaces, and everything in between. Customer-driven feature delivery Collaborate with forward-deployed teams to translate customer requirements into production-ready features that drive measurable revenue outcomes for clients. Code quality and standards Ensure code quality through best practices, testing, documentation, and code reviews. Set the standard for customer-centric engineering excellence — code is a means to an end, and you build with that in mind. Team mentorship and onboarding Support the onboarding and technical development of new engineering team members as the team grows. WHAT WE LOOK FOR A track record of shipping Experience delivering real projects and products to production. You've owned things end-to-end and have the scars to show for it. TypeScript and JavaScript fluency Strong proficiency in TypeScript and JavaScript, plus solid experience with at least one frontend framework — React, Svelte, Next.js, or similar. SQL and database design Solid knowledge of SQL databases, preferably PostgreSQL. Comfortable designing schemas and reasoning about data models. Software engineering best practices Strong understanding of testing, documentation, code review, and the longer-term cost of shortcuts — while also knowing when pragmatic compromises are the right call. High accountability in fast-moving environments You set reliable deadlines and meet them. When millions of dollars depend on a delivery date, you treat that seriously — and you communicate clearly when something is at risk. THE TEAM A small, tight-knit engineering team working directly with founders and customer-facing deployment strategists. The structure is flat, the feedback is direct, and the work has real-world consequence. You'll have genuine ownership from day one — both in terms of equity and the code you're responsible for. COMPENSATION & BENEFITS Salary $75,000 – $150,000 depending on experience. Equity 0.05% – 0.3% real equity. A meaningful slice at seed stage. Work model Remote, based in Warsaw.

🏢 Summary: Senior Full Stack Engineer role focused on enhancing the Dataform service by delivering new features, fixing bugs, and improving performance and supportability. The position involves contributing to both internal repositories and the open-source Dataform ecosystem while collaborating with engineers on issue triage and pull request management. The role centers on expanding a modern data modeling and transformation framework. 🗂️ Requirements: Experience as Senior Full Stack Engineer, Ability to implement features in full stack environment, Experience with bug fixing and performance optimization, Ability to write robust automated tests, Experience contributing to internal and open-source repositories, Experience with code reviews and pull request management, Experience with data modeling and transformation frameworks 📃 Skills: JavaScript, TypeScript, SQL, Git, Dataform, Testing 🏢 Description: We are seeking a versatile and highly skilled Senior Full Stack Engineer to join our team in Poland. In this role, you will focus on improving the feature set, performance, and supportability of the Dataform service by implementing features, resolving bugs, and writing robust tests in both internal repositories and the open-source Dataform ecosystem. You will collaborate closely with engineers to triage issues, manage pull requests, and expand the capabilities of a modern data modeling and transformation framework.

🏢 Summary: Senior Full-stack Engineer role focused on building and scaling a modern B2B SaaS platform for subscription-based e-commerce. The position involves end-to-end feature delivery, architectural decisions, and improving system scalability and reliability. High-impact role with strong ownership over technical direction and product evolution. 🗂️ Requirements: 7+ years engineering experience in complex systems, Strong system design skills, Experience designing scalable architectures, Full-stack development experience, Experience building SaaS platforms, Experience with e-commerce systems 📃 Skills: JavaScript, TypeScript, SaaS, Architecture, Scalability, Reliability, APIs, Ecommerce, Payments, Cloud 🏢 Description: Senior Full-stack Engineer Our client is building a modern B2B SaaS platform that enables businesses to launch and scale subscription-based models for physical and digital products. The product sits at the intersection of e-commerce, payments, and developer tooling, with a strong focus on extensibility and developer experience. The team is lean, senior, and highly experienced, backed by strong investors and industry advisors. They operate with high autonomy, fast execution, and strong ownership culture. Role We are looking for a Senior Full-stack Engineer to help shape the next evolution of the platform. You will work across architecture, product, and infrastructure, focusing on scalability, reliability, and developer experience. This is a high-impact role where you will influence both technical direction and product decisions. Responsibilities Build and evolve a scalable SaaS platform Design and deliver new features end-to-end Improve performance, reliability, and system architecture Collaborate with product, design, and growth teams Requirements 7+ years of engineering experience in complex systems Strong architectural and system design skills Ability to choose appropriate technologies per problem Experience working in cross-functional teams Strong communication in Polish and English Startup mindset: ownership, speed, adaptability Experience with e-commerce platforms is a plus Offer High-impact role in a senior engineering team with real product ownership and influence. Competitive salary plus ESOP, fully remote work (Poland), regular team offsites, and modern tooling including MacBook Pro and AI credits. Direct access to founders, investors, and advisors.

🏢 Summary: Senior Software Engineer role focused on designing and delivering new features and PoCs end-to-end on a large-scale SaaS and data platform. The position emphasizes backend development in Python, extending a mature system, and leveraging AI/LLM tools to accelerate development and improve engineering workflows. Fully remote with high ownership and impact on product direction. 🗂️ Requirements: 7+ years of Software Engineering experience, Strong experience with Python, Experience with Django, Experience building large-scale production systems, Experience designing and maintaining REST APIs, Strong understanding of distributed systems, Strong understanding of backend architecture, Daily practical use of AI tools and LLMs in development workflows, Experience with cloud environments, Ability to independently design and deliver end-to-end solutions, Professional English proficiency 📃 Skills: Python, Django, REST, API, SaaS, LLM, AI, Cloud, DistributedSystems, Backend 🏢 Description: Does building awesome, innovative products that add up to something meaningful sound like a dream come true? Come join us and make that vision a reality! About We are looking for a product-driven Senior Software Engineer who thrives in fast-paced environments and enjoys turning ideas into practical, user-focused solutions. In this role, you will independently design and deliver new features and PoC end-to-end on top of an existing large-scale SaaS and data platform. Rather than working in a purely greenfield environment, you will extend and evolve a mature platform with new capabilities, focusing on speed, usability, and real customer value. A key part of this role is the daily use of AI and LLM-based tools to accelerate development workflows, prototyping, research, testing, and delivery. We are looking for someone who not only uses AI tools effectively but also understands how to integrate AI reasoning and automation into modern software engineering practices. Responsibilities Independently design, prototype, and deliver new features and PoCs end-to-end Translate product ideas into scalable and user-focused backend solutions Validate technical feasibility and make pragmatic architectural decisions Use AI tools, coding copilots, and LLM-based workflows to accelerate development, experimentation, and delivery Build and maintain scalable backend services and REST APIs using Python (preferably Django) Collaborate closely with Product, Design, and Engineering teams to shape and refine new features Contribute to engineering quality through code reviews, technical guidance, and knowledge sharing Continuously explore and introduce practical AI-driven workflows that improve engineering productivity and delivery speed Our offer Competitive salary on B2B contract Fully remote position Real impact and independence at work Individual career path Work-life balance A non-corporate atmosphere where innovation, personal growth, and teamwork thrive 100+ smart, curious & ambitious engineers What you bring 7+ years of experience as a Software Engineer Strong experience with Python and preferably Django Experience building and maintaining large-scale production systems and REST APIs Strong understanding of distributed systems and modern backend architecture Demonstrated daily use of AI tools and LLMs in real engineering workflows (e.g. code generation, prototyping, refactoring, testing, documentation, automation) Experience integrating with complex platforms and cloud environments Ability to independently deliver solutions with minimal supervision Strong product mindset and focus on solving real user problems Excellent communication and collaboration skills across Product, Design, and Engineering teams Curiosity, ownership, and passion for learning and experimenting with new technologies Professional level of English Nice to Have Experience mentoring or coaching engineers Experience working with data products and related scalability challenges Experience promoting AI-driven engineering practices and helping teams adopt modern AI workflows Benefits International Projects Small Teams Flat Structure Friendly Atmosphere Flexible Hours Individual Career Path We want your TALENT! Don’t hesitate and APPLY! We are happy to tell you more details about this position in a phone call. Our recruitment process is very fast and straightforward to ensure a great experience from the first interview to joining your dream team!

🏢 Summary: Senior Fullstack Engineer role focused on designing and scaling production-grade web systems, owning the full product experience from backend to frontend. The position combines product thinking with engineering, emphasizing AI-augmented features and modern fullstack architecture. You will work on complex, mission-critical applications with strong autonomy and technical ownership. 🗂️ Requirements: 5+ years of experience building complex web applications, Strong proficiency in Python or Ruby, Strong proficiency in Vue.js or React.js, Solid understanding of SQL and PostgreSQL, Experience with CI/CD pipelines, Experience with cloud environments, Experience using AI/LLM tools in development workflows, Fluent English (C1) 📃 Skills: Python, Ruby, Vue.js, React.js, PostgreSQL, SQL, AWS, Docker, CI/CD, Claude, Cursor 🏢 Description: At Upside , we’re partnering with ambitious companies across the globe to solve complex, meaningful problems through technology. We work in focused teams, combining engineering, product thinking, and design, to deliver outcomes, not just output. Open-source is a strategic part of our work. We build and maintain a number of open-source projects that support our clients and internal R&D. Our latest release is Enthusiast , a customizable agentic AI toolkit for e-commerce. What it means for you You’ll have a "Founder" mindset. You won’t just build a UI or a database - you’ll own the entire product experience. You’ll be a technical partner to stakeholders, helping them understand what’s possible with modern tech and AI. You’ll have the autonomy to experiment across the stack and the responsibility to deliver tools that actually solve business problems. You’ll work at the intersection of product thinking and engineering, deploying AI-augmented features across the entire stack. Role Overview As a Senior Fullstack Engineer, you’ll design and scale resilient systems from the ground up. You’ll bridge the gap between backend logic and frontend experience, ensuring a seamless, production-grade product. Responsibilities End-to-End Ownership: Lead the design and implementation of both backend systems and frontend interfaces. Proactive Solutions: Don't just flag blockers—come with proposals and experiments to bypass them. Consulting: Translate complex business needs into elegant, scalable fullstack architecture. Engineering Standards: Advocate for code quality, security, and performance across the entire repo. Continuous Improvement: Constantly evaluate new tech (especially AI/LLM) to improve delivery. Requirements Experience: 5+ years of building complex web applications. Backend: Strong proficiency in Python or Ruby. Frontend: Mastery of Vue.js or React.js . Infrastructure: Solid understanding of SQL (PostgreSQL), CI/CD, and cloud environments. AI-Native: You use tools like Claude or Cursor to build better and faster. English: Fluent (C1) for direct client collaboration. Tech Stack: Python, Ruby, Vue.js , React.js , PostgreSQL, AWS, Docker. Value Proposition Built for the long run We hire for the company, not just a project - looking for passion driven engineers who want to grow with Upside over time Small teams, real accountability. 3-9 people per engagement. We're small by design. That means your decisions carry weight and you are visible. Mission-critical work: We handle complex  projects that move the needle for international brands. Our clients are scaling companies, established international brands, and large institutions. The systems you build will be under real load, with real stakes. Real Ownership: You take part in the decision making process on technology and implementation..You’re empowered to take initiative, experiment, and drive solutions that create real impact. No Micromanagement: We trust you to own your work and deliver outcomes - no unnecessary oversight. Collaborative R&D: Contribute to targeted Open-source projects and internal AI research. Growth through challenges: Complex problems and direct client exposure means you’ll grow by action. Applied AI as a first-class discipline. We don't bolt AI onto projects as an afterthought. You'll identify where it genuinely moves the needle and lead the implementation - on client work and on our own open-source tooling. The tools you want. If something makes you faster or sharper, we want you using it. Transparent progression path. We have defined engineering levels with clear criteria - you'll know exactly what each role looks like, and what it takes to get from one to the other. No ambiguity, no waiting for someone above you to move on If you didn't find all the information you were looking for, have a look at our handbook - it covers a variety of different matters that could be important at this stage. If there's anything else we did not mention that you're interested in - share your thoughts with us careers@upsidelab.io Compensation & Location Salary: Senior Engineer: 20 800 - 25 900 PLN net + VAT Lead Engineer: >25 900 PLN net + VAT Location: Office in Kraków, hybrid, fully-remote.

🏢 Summary: Senior Fullstack Engineer role focused on designing and scaling production-grade web systems end-to-end, combining backend, frontend, and AI-driven features. The position emphasizes ownership of the full product experience, from architecture to deployment, in client-facing, mission-critical projects. Engineers work across the stack with strong autonomy, applying modern AI tools and best engineering practices. 🗂️ Requirements: 5+ years of experience building complex web applications, Strong proficiency in Python or Ruby, Advanced knowledge of Vue.js or React.js, Solid understanding of SQL and PostgreSQL, Experience with CI/CD pipelines, Experience with cloud environments, Hands-on use of AI tools such as Claude or Cursor, Fluent English (C1 level) 📃 Skills: Python, Ruby, Vue.js, React.js, PostgreSQL, SQL, AWS, Docker, CI/CD, Claude, Cursor 🏢 Description: At Upside , we’re partnering with ambitious companies across the globe to solve complex, meaningful problems through technology. We work in focused teams, combining engineering, product thinking, and design, to deliver outcomes, not just output. Open-source is a strategic part of our work. We build and maintain a number of open-source projects that support our clients and internal R&D. Our latest release is Enthusiast , a customizable agentic AI toolkit for e-commerce. What it means for you You’ll have a "Founder" mindset. You won’t just build a UI or a database - you’ll own the entire product experience. You’ll be a technical partner to stakeholders, helping them understand what’s possible with modern tech and AI. You’ll have the autonomy to experiment across the stack and the responsibility to deliver tools that actually solve business problems. You’ll work at the intersection of product thinking and engineering, deploying AI-augmented features across the entire stack. Role Overview As a Senior Fullstack Engineer, you’ll design and scale resilient systems from the ground up. You’ll bridge the gap between backend logic and frontend experience, ensuring a seamless, production-grade product. Responsibilities End-to-End Ownership: Lead the design and implementation of both backend systems and frontend interfaces. Proactive Solutions: Don't just flag blockers—come with proposals and experiments to bypass them. Consulting: Translate complex business needs into elegant, scalable fullstack architecture. Engineering Standards: Advocate for code quality, security, and performance across the entire repo. Continuous Improvement: Constantly evaluate new tech (especially AI/LLM) to improve delivery. Requirements Experience: 5+ years of building complex web applications. Backend: Strong proficiency in Python or Ruby. Frontend: Mastery of Vue.js or React.js . Infrastructure: Solid understanding of SQL (PostgreSQL), CI/CD, and cloud environments. AI-Native: You use tools like Claude or Cursor to build better and faster. English: Fluent (C1) for direct client collaboration. Tech Stack: Python, Ruby, Vue.js , React.js , PostgreSQL, AWS, Docker. Value Proposition Built for the long run We hire for the company, not just a project - looking for passion driven engineers who want to grow with Upside over time Small teams, real accountability. 3-9 people per engagement. We're small by design. That means your decisions carry weight and you are visible. Mission-critical work: We handle complex  projects that move the needle for international brands. Our clients are scaling companies, established international brands, and large institutions. The systems you build will be under real load, with real stakes. Real Ownership: You take part in the decision making process on technology and implementation..You’re empowered to take initiative, experiment, and drive solutions that create real impact. No Micromanagement: We trust you to own your work and deliver outcomes - no unnecessary oversight. Collaborative R&D: Contribute to targeted Open-source projects and internal AI research. Growth through challenges: Complex problems and direct client exposure means you’ll grow by action. Applied AI as a first-class discipline. We don't bolt AI onto projects as an afterthought. You'll identify where it genuinely moves the needle and lead the implementation - on client work and on our own open-source tooling. The tools you want. If something makes you faster or sharper, we want you using it. Transparent progression path. We have defined engineering levels with clear criteria - you'll know exactly what each role looks like, and what it takes to get from one to the other. No ambiguity, no waiting for someone above you to move on If you didn't find all the information you were looking for, have a look at our handbook - it covers a variety of different matters that could be important at this stage. If there's anything else we did not mention that you're interested in - share your thoughts with us careers@upsidelab.io Compensation & Location Salary: Senior Engineer: 20 800 - 25 900 PLN net + VAT Lead Engineer: >25 900 PLN net + VAT Location: Office in Kraków, hybrid, fully-remote.

🏢 Summary: Senior Full Stack Developer role focused on maintaining, enhancing, and scaling an existing live product in a fully remote EU-based setup. The position involves working across backend and frontend layers to improve functionality, fix issues, and implement new features based on user feedback. You will contribute to product stability, performance, and continuous improvement in a mission-critical environment. 🗂️ Requirements: 6+ years experience as Full Stack Developer, Strong backend experience with Python, Strong frontend experience with React, Understanding of databases, Experience with cloud environments, preferably Azure, Knowledge of full software development lifecycle, Experience maintaining and improving existing products, Strong debugging and troubleshooting skills, Fluent English, Legal right to work in the EU 📃 Skills: Python, React, Azure, SQL, Cloud, Git, REST, JavaScript, HTML, CSS 🏢 Description: Unleash your full potential — elevate a live product by supporting, refining, and evolving real-world solutions! EU-based opportunity with a fully remote work model (5 days/week). As a Senior Full Stack Developer , you will be working for our client, a leading software environment where your expertise directly impacts a live, client-specific solution. You’ll support, enhance, and maintain an established product, ensuring it remains robust, user-friendly, and scalable as new users and needs emerge. This role offers a unique chance to contribute to a mission-critical platform while advancing your career in a dynamic, innovative environment. Your main responsibilities: Support ongoing development and maintenance of an existing software product. Troubleshoot and resolve bugs reported during onboarding and daily usage. Implement UI/UX improvements and new features based on user feedback. Work across backend and frontend layers to ensure seamless functionality. Collaborate with stakeholders to understand issues, prioritize improvements, and deliver practical solutions. Help onboard new users by maintaining platform stability and efficiency. Contribute to continuous code quality, usability, and performance enhancements. You're ideal for this role if you have: 6+ years of experience as a Full Stack Developer / Engineer. Hands-on experience with Python on the backend. Strong experience with React on the frontend. Basic to solid understanding of databases and cloud environments, preferably Azure. Knowledge of the software development lifecycle from both frontend and backend perspectives. Experience maintaining and improving existing products rather than only building from scratch. Ability to identify issues, debug effectively, and deliver clean, practical fixes. Strong problem-solving skills with a product-minded approach. Sensitivity to UI/UX and user needs. It is a strong plus if you have: (optional) Experience working on client-facing internal tools or single-client environments. Enthusiasm for AI and understanding of how it works. Exposure to product support, user onboarding, or post-launch optimization. Familiarity with feature request handling and iterative product improvements. Knowledge of cloud-based architecture in Azure. Language required for this role: Fluent English Eligibility for the role: Only candidates with an existing legal right to work in the European Union will be considered for this role. #MAKEYourCareerBETTER Interested? Apply now and include your CV (preferably in English) along with a statement confirming your consent to the processing and storage of your personal data.