Gergő Sárffy
Available for work
Gergő Sárffy
Available for work
Gergő Sárffy
Available for work
About
Software engineer and architect who moved from shipping features to designing systems and leading the teams that build them. Seven years of industrial-grade delivery across finance, energy, defense and contracting, spanning full-stack web and mobile development as well as applied AI: TypeScript full-stack web, React Native apps, enterprise RAG and knowledge platforms, intelligent document processing and fully self-hostable deployments for organizations that cannot send their data to a public API. Comfortable translating a business idea into a costed implementation proposal, then leading it to go-live.
As a self-taught full stack developer and software architect, I am extremely passionate about staying up-to-date with the latest technologies and constantly improving my skills. I have a strong foundation in both front-end and back-end technologies, and I am confident in my ability to deliver high-quality, scalable solutions for any project.
Equally invested in the practical side of AI inside engineering teams: writing internal AI usage policies, running developer education and mentoring, and building agentic development systems and harnesses that turn AI-assisted development into a standard, reviewable part of the workflow. Based in Tilburg, Netherlands, available remote and across the EU.
I've assisted in the development of industrial-level software for a broad range of entities across various sectors, such as finance, ecommerce, services and gaming.
I provide services covering the entire software development lifecycle, from initial design through testing and ultimately, deployment to production. The creation of web applications, mobile applications, and complex systems requiring extensive infrastructure are within my area of expertise.
Experience
Software Engineering Lead
X Consulting, Budapest / Remote
November 2025 - Current
Lead all technical projects in the company, owning architecture, delivery and quality across the client portfolio from discovery call to production go-live.
Led three product lines end to end: an enterprise AI knowledge base platform, an AI document validation platform and an AI pitch-deck generation platform, delivered to key players in the energy and space/defense sectors plus international consulting firms.
Hire, manage and lead subcontractor engineers; work with client engineering teams on API contracts, integrations and security/data residency reviews; convert business ideas into implementation proposals and lead the resulting SDLC. Stack: TypeScript (Next.js, NestJS, React, React Native / Expo), Python, Go, Azure, PostgreSQL, vector databases, Docker.
Software Engineering Lead
X Consulting, Budapest / Remote
November 2025 - Current
Lead all technical projects in the company, owning architecture, delivery and quality across the client portfolio from discovery call to production go-live.
Led three product lines end to end: an enterprise AI knowledge base platform, an AI document validation platform and an AI pitch-deck generation platform, delivered to key players in the energy and space/defense sectors plus international consulting firms.
Hire, manage and lead subcontractor engineers; work with client engineering teams on API contracts, integrations and security/data residency reviews; convert business ideas into implementation proposals and lead the resulting SDLC. Stack: TypeScript (Next.js, NestJS, React, React Native / Expo), Python, Go, Azure, PostgreSQL, vector databases, Docker.
AI Engineer
1337 Partners, Remote
January 2026 - August 2026
Shipped smaller AI client use cases, including a generative AI hotel customer service solution and an AI voice agent built with ElevenLabs.
Contributed to an enterprise AI platform with model deployment management, advanced user management and authentication, audit trails, admin dashboards and external data connectors.
Supported custom LLM inference work (capacity estimation, GPU planning, model serving optimization and quantization); built RAG pipelines; shipped Python and Node.js workers/microservices; delivered agentic workflows with tool calling, structured outputs and guardrails. Stack: TypeScript (Next.js, NestJS), Python (FastAPI), Node.js workers, Azure, vLLM, Qdrant, Redis, Docker.
AI Engineer
1337 Partners, Remote
January 2026 - August 2026
Shipped smaller AI client use cases, including a generative AI hotel customer service solution and an AI voice agent built with ElevenLabs.
Contributed to an enterprise AI platform with model deployment management, advanced user management and authentication, audit trails, admin dashboards and external data connectors.
Supported custom LLM inference work (capacity estimation, GPU planning, model serving optimization and quantization); built RAG pipelines; shipped Python and Node.js workers/microservices; delivered agentic workflows with tool calling, structured outputs and guardrails. Stack: TypeScript (Next.js, NestJS), Python (FastAPI), Node.js workers, Azure, vLLM, Qdrant, Redis, Docker.
Software Architect
Peak Financial Services / PeakX, Budapest
October 2024 - December 2025
Sole founding engineer of PeakX, taking Peak's enterprise AI division from zero to production, including the RAG engine behind its AI proof-of-concept offering for banking and enterprise clients.
Mapped and reviewed technical feasibility of AI projects for a large Hungarian bank, then led the implementation into production.
Integrated LLM platforms with open-source and managed AI services; laid architecture of AI solutions serving 10,000+ users; helped establish a development team of 7 and introduced coding standards, onboarding, development strategy and DevOps pipelines. Stack: TypeScript, Next.js, NestJS, React, RAG architectures, vector databases, Azure.
Software Architect
Peak Financial Services / PeakX, Budapest
October 2024 - December 2025
Sole founding engineer of PeakX, taking Peak's enterprise AI division from zero to production, including the RAG engine behind its AI proof-of-concept offering for banking and enterprise clients.
Mapped and reviewed technical feasibility of AI projects for a large Hungarian bank, then led the implementation into production.
Integrated LLM platforms with open-source and managed AI services; laid architecture of AI solutions serving 10,000+ users; helped establish a development team of 7 and introduced coding standards, onboarding, development strategy and DevOps pipelines. Stack: TypeScript, Next.js, NestJS, React, RAG architectures, vector databases, Azure.
Software Architect
Peak Financial Services / PeakX, Budapest
October 2024 - December 2025
Sole founding engineer of PeakX, taking Peak's enterprise AI division from zero to production, including the RAG engine behind its AI proof-of-concept offering for banking and enterprise clients.
Mapped and reviewed technical feasibility of AI projects for a large Hungarian bank, then led the implementation into production.
Integrated LLM platforms with open-source and managed AI services; laid architecture of AI solutions serving 10,000+ users; helped establish a development team of 7 and introduced coding standards, onboarding, development strategy and DevOps pipelines. Stack: TypeScript, Next.js, NestJS, React, RAG architectures, vector databases, Azure.
Full Stack Developer
Peak Financial Services, Budapest
June 2023 - October 2024
Built proof-of-concept projects to assess client needs and implemented a shared design system in small dynamic teams.
Experimented with early AI technologies and evaluated their viability in production, the work that grew into Peak's AI practice.
Developed user-facing features in enterprise finance applications alongside external development teams and business representatives. Stack: TypeScript, React, Next.js, NestJS.
Full Stack Developer
Peak Financial Services, Budapest
June 2023 - October 2024
Built proof-of-concept projects to assess client needs and implemented a shared design system in small dynamic teams.
Experimented with early AI technologies and evaluated their viability in production, the work that grew into Peak's AI practice.
Developed user-facing features in enterprise finance applications alongside external development teams and business representatives. Stack: TypeScript, React, Next.js, NestJS.
Full Stack Developer
Peak Financial Services, Budapest
June 2023 - October 2024
Built proof-of-concept projects to assess client needs and implemented a shared design system in small dynamic teams.
Experimented with early AI technologies and evaluated their viability in production, the work that grew into Peak's AI practice.
Developed user-facing features in enterprise finance applications alongside external development teams and business representatives. Stack: TypeScript, React, Next.js, NestJS.
Full Stack Software Engineer
Rollout IT, Remote
May 2023 - December 2025
Delivered feature work and full-scale refactors across several inherited client codebases, improving maintainability and performance.
Led the mobile-friendly rework of an algorithmic trading platform.
Built an AI-powered used-car search engine, applying machine learning to improve result relevance and engagement. Stack: TypeScript / JavaScript, React, Express, PostgreSQL, MongoDB, Supabase.
Full Stack Software Engineer
Rollout IT, Remote
May 2023 - December 2025
Delivered feature work and full-scale refactors across several inherited client codebases, improving maintainability and performance.
Led the mobile-friendly rework of an algorithmic trading platform.
Built an AI-powered used-car search engine, applying machine learning to improve result relevance and engagement. Stack: TypeScript / JavaScript, React, Express, PostgreSQL, MongoDB, Supabase.
Full Stack Software Engineer
Rollout IT, Remote
May 2023 - December 2025
Delivered feature work and full-scale refactors across several inherited client codebases, improving maintainability and performance.
Led the mobile-friendly rework of an algorithmic trading platform.
Built an AI-powered used-car search engine, applying machine learning to improve result relevance and engagement. Stack: TypeScript / JavaScript, React, Express, PostgreSQL, MongoDB, Supabase.
Full Stack Web & Mobile Developer
Wedding Manager, Budapest
June 2021 - March 2023
Early-stage startup: took part in product development, brainstorming and initial tech planning alongside day-to-day delivery.
Built web and mobile features for a platform that connects couples with venues and wedding service providers and helps them plan the full wedding journey.
Stack: React, React Native, NestJS, AWS.
Full Stack Web & Mobile Developer
Wedding Manager, Budapest
June 2021 - March 2023
Early-stage startup: took part in product development, brainstorming and initial tech planning alongside day-to-day delivery.
Built web and mobile features for a platform that connects couples with venues and wedding service providers and helps them plan the full wedding journey.
Stack: React, React Native, NestJS, AWS.
Full Stack Web & Mobile Developer
Wedding Manager, Budapest
June 2021 - March 2023
Early-stage startup: took part in product development, brainstorming and initial tech planning alongside day-to-day delivery.
Built web and mobile features for a platform that connects couples with venues and wedding service providers and helps them plan the full wedding journey.
Stack: React, React Native, NestJS, AWS.
Co-Founder & IT Specialist
Hungarian Rockstar Club
June 2018 - December 2020
Managed and maintained a legacy project, ensuring continued functionality and support.
Developed and deployed small features to serve players interested in related videogames.
Configured nginx for network management, set up DNS, and integrated with providers like Cloudflare for enhanced security.
Co-Founder & IT Specialist
Hungarian Rockstar Club
June 2018 - December 2020
Managed and maintained a legacy project, ensuring continued functionality and support.
Developed and deployed small features to serve players interested in related videogames.
Configured nginx for network management, set up DNS, and integrated with providers like Cloudflare for enhanced security.
Co-Founder & IT Specialist
Hungarian Rockstar Club
June 2018 - December 2020
Managed and maintained a legacy project, ensuring continued functionality and support.
Developed and deployed small features to serve players interested in related videogames.
Configured nginx for network management, set up DNS, and integrated with providers like Cloudflare for enhanced security.
Skills
Languages
TypeScript, JavaScript, Python, Go, SQL
Web & Application
React, Next.js, React Native, Expo, Tailwind CSS, NestJS, Node.js, Express, FastAPI, WebSockets, REST, queue workers, GraphQL, microservices
Data, Cloud & Infrastructure
PostgreSQL, MongoDB, Prisma, pgvector, Qdrant, Redis, Azure, AWS, Docker, CI/CD, GitHub Actions, Linux
AI & LLM Engineering
RAG architectures, LLM inference infrastructure, vLLM, model serving, inference optimization, embedding pipelines, hybrid search, reranking, agentic workflows, prompt engineering, evaluation harnesses, guardrails & PII redaction, self-hosted LLMs
Architecture & Leadership
architecture reviews, project scoping & estimation, API & integration design, hiring & leading subcontractors, code review, mentoring, CI/CD & engineering standards, technical proposals
Platform & Tooling
Docker, CI/CD, GitHub Actions, NX, Turborepo, Linux, Git, Figma
Mobile & Cross-Platform
React Native, Expo, Electron
Contact
Made by
Gergő Sárffy
Built in
Framer.io
Made by
Gergő Sárffy
Built in
Framer.io
Made by
Gergő Sárffy
Built in
Framer.io
Made by
Gergő Sárffy
Built in
Framer.io