Alfonso Acosta
Freelance Software Engineer at Syntactic Sugar AB
Madrid, Community of Madrid, Spain
Summary
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RockstarAlfonso Acosta is a freelance software engineer based in Madrid with 11 years of experience building and hardening cloud-native backends and CI/CD workflows. As founder of Syntactic Sugar SLU, he blends hands-on backend development with DevOps expertise, contributing to high-profile open-source projects like eksctl (EKS CLI), Flux, and Stellar’s Go monorepo. His work shows a pattern of improving reliability and developer experience—migrating builds to Go modules, optimizing CircleCI caching, fixing race conditions, and enhancing error handling and logging. Comfortable across Kubernetes, GitOps, and distributed transaction systems, he brings a pragmatic focus on performance, stability, and maintainability that often surfaces in subtle infrastructure and API refinements.
11 years of coding experience
Stackoverflow
4,985reputation
607kreached
42answers
21questions
docker
top-5%
visibility
top-5%
linux
top-5%
gcc
top-5%
shared-libraries
top-1%
Github Skills (36)
amazon-eks10
kubernetes10
docker10
apidoc10
amazon-web-services10
dockers10
cicd10
gitops10
automation10
go10
api10
automation-testing10
shared-libraries10
aws10
blockchain10
Programming languages (28)
Github contributions (5)
stellar/go-stellar-sdk
Feb 2020 - Jan 2023
Stellar's Go SDK
Role in this project:
Back-end Developer
Back-end DeveloperContributions:14 releases, 868 reviews, 355 commits in 2 years 11 months
Contributions summary:Alfonso primarily contributed to the backend of the Stellar Horizon project, focusing on implementing and validating various features within the Horizon API, specifically relating to the liquidity pool implementation. The commits involved modifying and enhancing several endpoints and data structures, which included creating, updating, and removing data and code to support the new Clawback operations. Further contributions included addressing issues in the transaction submission system, optimizing performance, and enhancing overall system robustness.
gostellarblockchaincryptocurrencyhorizon
fluxcd/flux
Dec 2018 - Mar 2020
Successor: https://github.com/fluxcd/flux2
Role in this project:Back-end & DevOps Engineer
Back-end & DevOps EngineerContributions:7 releases, 350 commits, 333 PRs in 1 year 2 months
Contributions summary:Alfonso focused on improving the error handling and logging within `fluxctl`, specifically improving the context of error messages. They also contributed to the core functionality of the Flux daemon, introducing a warning for external changes in the git sync tag, which enhances the stability of deployments. Furthermore, this user worked on delegating GroupVersion parsing to the schema.ParseGroupVersion in `cluster/kubernetes/sync.go`. They also fixed a race condition and refactored code.
fluxcdkubernetesgitops
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