At CI&T, we help large enterprises transform the potential of AI into real business impact with AI Deployment, AI-native execution, and tech-integrated business solutions.
With 30 years of experience in technological transformation, we accelerate innovation with expertise in Agentic SDLC, Application modernization, Data & AI, Martech and Business strategy.
We are 8,000 CI&Ters across more than 25 countries, collaborating to build solutions with real impact. AI is already part of how we work, evolve, and innovate every day.
Responsibilities
Build the .NET client for the new services from gRPC .proto contracts.
Re-implement the existing .NET wrapper so its public interface stays the same while calls go to gRPC and Arrow Flight instead of OneTick.
Convert Arrow record batches into the .NET types applications use today, efficiently and without precision loss.
Write tests that compare results from the old and new backends for the same calls.
Required
6+ years of C# and modern .NET (6 or later).
Production experience with gRPC in .NET (Grpc.Net.Client, protobuf code generation, streaming calls).
Hands-on use of Apache Arrow in .NET (Apache.Arrow package) or another columnar data format.
Strong handling of high-volume data: memory allocation, Span/Memory, streaming, async.
Care with timestamp precision, time zones and numeric types.
Nice to have
Arrow Flight in any language.
kdb+ C# client experience (csharpkdb, qSharp) or basic q.
Prior work wrapping a market data or tick database API (OneTick, kdb+, Bloomberg, Refinitiv).
Background and ways of working
Finance background (preferred, not required)
Market data work at a hedge fund, bank, broker or trading technology vendor.
Familiarity with trades, quotes, order books, symbology, corporate actions and exchange calendars.
Understanding of the difference between exchange, vendor and capture timestamps, and why it matters.
Any of: equities, options, futures, FX or fixed income data.
Also expected
Fluent written and spoken English; comfortable working directly with client engineers.
Writes tests and works in Git-based code review.
Linux comfort; CI/CD and containers are a plus.
Able to overlap at least 4 hours a day with US Eastern time.
Own and ship a production Windows endpoint security agent, spanning C#/.NET services, network interception, local TLS inspection, on-device ML, and reliable coexistence with enterprise security tools.
Build and operate card and account lifecycle services, design developer-focused APIs, and improve resilient payment systems spanning card issuance, digital wallets, tokenization, and KYB/KYC.
Use AI-assisted engineering to analyse large codebases, map an OpenStack-derived cloud platform, diagnose builds, and create technical handover artefacts that support due diligence and transition readiness.
Own the architecture and technical direction of high-throughput advertising systems, resolve complex ad-tech challenges, and guide product, engineering, and leadership decisions across the advertising domain.
As a Senior Software Engineer, you will design strategic solutions, lead projects, troubleshoot code, and implement DevOps practices while collaborating with the Customer Experience team.
