Hire Freelance Trading Software Developers
John Lazar
John is a senior quant developer and AI developer who's worked the full development lifecycle of various applications. He's proficient in several languages—C++, C#, Java, Python, and R, to name a few—across Windows and Linux. The types of projects where John excels are advising and implementing in-house cloud distributions of heavy-load operations combined with continuous integration and deployment (Linux, DevOps packages).
Show MoreErdinc Mutlu
Erdinc is a software engineer with 28 years of experience and extensive software and systems development skills in multinational companies. He has solid knowledge of back-end development, fintech, payment systems, cryptocurrencies, AWS, GCP, test automation, and digital communication systems. He is highly proficient in Go, Python, ANSI C, C++, test automation, embedded systems, device drivers, Linux, and real-time operating systems. Erdinc is proactive, highly organized, and self-motivated.
Show MoreColan Walsh
Colan is an experienced senior financial quantitative developer and researcher with experience across various asset classes and trading venues. He has a multidisciplinary background, working in quant development, quant research, and options trading for multiple investment banks and hedge funds.
Show MoreDaniel Fonnegra Garcia
Daniel is a skilled software engineer with seven years of experience in various industries like IoT, mining, fintech, and streaming. He specializes in architecting scalable software in Python with FastAPI, SQLAlchemy, and PostgreSQL, combined with software design approaches like domain-driven design (DDD), CQRS, event sourcing, and hexagonal architecture. Daniel has deployed scalable apps to AWS for several years using services like Amazon EC2, Amazon S3, Amazon EKS, Route 53, and Amazon RDS.
Show MoreAndrea Nalon
Andrea is a senior AI engineer with 20+ years' experience bridging legacy data with production GenAI and RAG solutions. Combining a master's degree in engineering with quant finance and LLM expertise, he converts complex data—from PepsiCo insights to hedge fund algorithms—into AI systems. With real-world, problem-solving experience, he provides the strategic oversight required to move organizations from AI experimentation to disciplined, high-ROI implementation.
Show MoreArthur Stankevich
Arthur has 15 years of professional software development experience, mostly with .NET and SQL Server. He started with desktop database applications, moved to client-server application development and project management for real-time systems with clients and servers distributed over four continents.
Show MoreMichał Adamczyk
Michał is a data scientist with 5+ years of experience specializing in machine learning, probability theory, statistics, and visualization. His extensive hands-on data science experience and strong theoretical background bring exceptional value to analytics and data science challenges and solutions. Michał's industry experience is backed by a master's and bachelor's degree in computer science and a bachelor's degree in mathematics.
Show MoreRoberto Pisati
A geek by nature and a battle-tested software engineer by trade, Roberto spent more than two decades building exciting products for companies of all sizes, from small startups to big corporations. After so much time as a developer, he started to look for a different challenge and got into entrepreneurship. Roberto has been part of a very early-stage startup, helping with everything he could, from technical design to documentation and filling application forms for programs and accelerators.
Show MoreIvan Vasilev
Ivan is an enthusiastic software engineer and machine learning researcher. His experience ranges across many fields and technologies, but his primary focuses are deep learning, Python, algorithmic trading, and Java. Ivan has written three books and has several open-source projects.
Show MoreMegha Mittal
Megha has more than five years of developer experience with various Toptal clients and firms like Goldman Sachs and Amazon. She specializes in back-end platforms and large-scale real-time systems. She also has experience with leading and managing teams. Megha is well versed in relational and non-relational databases, application servers, micro-service architecture, REST APIs, Android, and AWS frameworks. She is thorough with her work and passionate about developing maintainable systems.
Show MoreJohn R. Kosinski
John is a senior technologist and system owner specializing in high‑risk, high‑constraint environments across blockchain, financial markets, and large‑scale distributed systems. He is known for owning systems end‑to‑end where failure carries real financial, operational, or reputational consequences. John brings ideas from concept to production under risk, constraint‑driven architecture, and decision ownership in ambiguous environments.
Show MoreDiscover More Trading Software Developers in the Toptal Network
Start Hiring




















