Senior Systems Engineer - Email Deliverability & Infrastructure
We are seeking a highly technical, impact-driven Senior Systems Engineer to own, scale, and protect our core email transmission infrastructure.
In this role, your golden rule will be Reputation Above All.
You are not just managing email lists or monitoring dashboards; you will architect and maintain the high-availability server infrastructure, Mail Transfer Agents (MTAs), and automated defensive systems that ensure our legitimate traffic hits the inbox while bad actors are ruthlessly contained.
The adecuado candidate bridges the gap between deep Linux systems administration, network engineering, and advanced email deliverability strategy.
You will have a massive impact on the company by safeguarding our global IP/domain reputation, minimizing blast radiuses, and ensuring zero-downtime mail operations across our entire infgileEngine is an Inc. **** company that creates award-winning software for Fortune 500 brands and trailblazing startups across 17+ industries.
We rank among the leaders in areas like application development and AI/ML, and our people-first culture has earned us multiple Best Place to Work awards.
WHY JOIN US
If you're looking for a place to grow, make an impact, and work with people who care, we'd love to meet you!
ABOUT THE ROLE
We are looking for a Senior Backend Engineer to build and maintain backend services, automation workflows, and Salesforce API integrations supporting a GTM data platform and AI-assisted sales automation initiatives.
You will develop REST APIs and webhook-based lead routing systems, integrate with Salesforce APIs including EVO and Omnichannel, and contribute to AI SDR automation workflows using Java or Python in an Agile sprint environment.
The role requires 4+ years of backend engineering experience with Salesforce platform development or API integration expertise.
WHAT YOU WILL DO
Build and maintain backend services and automation workflows (Java / Python / microservices).
Develop and integrate with Salesforce APIs (EVO, Omnichannel, lead assignment rules).
Support AI SDR automation — including Ghost User setup, Calendly integration, webhook-based lead routing.
Contribute to the GTM data platform codebase.
Work within an agile sprint process with a JIRA-based backlog (GTMDR project).
MUST HAVES
4+ years of experience in Backend engineering: Java OR Python.
REST API integration and webhook development.
Experience with CRM automation and lead routing systems.
Familiarity with agile delivery and JIRA.
NICE TO HAVES




Salesforce Apex, Calendly API, or experience building AI-assisted sales tooling.
PERKS AND BENEFITS
Growth without limits : build your skills through mentorship, internal TechTalks, challenging projects, and a dedicated annual learning budget
Competitive compensation : get recognition that reflects your skills and impact, with regular performance and compensation reviews
Flexibility : work 100% remotely with flexible hours that support focus, autonomy, and a healthy work rhythm
Meaningful, modern projects : build impactful products using modern technologies alongside global teams and leading brands
Collaborative culture : join a supportive environment with zero micromanagement where ideas are welcomed and contributions are recognized
Well-being & support : access local well-being programs and people-focused support tailored to your location
The Opportunity
We are looking for a Senior Backend Engineer who thrives in startup environments and enjoys building scalable systems from the ground up.
This role is ideal for engineers who combine deep backend expertise with a strong ownership mindset.
You will play a key role in designing, building, and maintaining distributed systems while collaborating with a highly technical and fast-moving team.
The ideal candidate has extensive experience with Java and Python, enjoys solving complex engineering problems, and embraces AI-assisted development workflows to increase productivity without compromising quality.
Responsibilities
Design, build, and maintain scalable backend services using Java and Python.
Develop distributed systems involving databases, APIs, message queues, and data processing pipelines.
Take full ownership of features and services throughout their lifecycle, from design and implementation to monitoring and optimization.
Build production-ready systems with a strong focus on reliability, performance, and maintainability.
Collaborate closely with product and engineering teams to translate business requirements into technical solutions.
Improve system performance, scalability, and operational efficiency across the platform.




Leverage AI-assisted development tools to accelerate delivery while ensuring code quality and engineering best practices.
Participate in architectural discussions and contribute to key technical decisions as the company scales.
Continuously improve development processes, tooling, and engineering standards.
ems Engineering Background: 5+ years of experience as a Linux Systems Administrator, DevOps, or Infrastructure Engineer with deep networking knowledge (TCP/IP, routing, ports, DNS management).
MTA Mastery: Expert-level proficiency configuring, debugging, and optimizing enterprise mail tools such as Postfix , Dovecot , or Postal.
Security & Filtering: Hands-on experience writing rules and maintaining mail-filtering/anti-abuse applications like Rspamd and Fail2Ban.
Observability Pipelines: Proven experience building or maintaining log pipelines using Vector or similar high-scale telemetry frameworks.
Infrastructure Automation: Experience implementing network routing layer tools (HAProxy , FRRouting ) and relational databases (PostgreSQL replication).
Certificate Management: Strong familiarity with automated SSL/TLS certificate rotation and multi-node compliance monitoring to ensure broken TLS never causes silent drops.
Deliverability & Operational Standards
Deep comprehension of the difference between Delivery (server handoff) and Deliverability (inbox placement).
Expert parsing of aggregate DMARC reports using platforms like DMARCian, Valimail, or Postmark.
Strict commitment to Acceptable Use Policies (AUP): zero tolerance for purchased/scraped lists and a firm grasp on Feedback Loop (FBL) automated triage.
Key Performance Indicators (KPIs)
Your success in this role will be directly measured by your ability to keep our infrastructure metrics pristine:
Global Infrastructure Spam Complaint Rate: Maintained strictly under 0.1%.
Global Hard Bounce Rate: Kept consistently below 2.0%.
Infrastructure Uptime: *****% availability across all outbound MTAs and mail relays.
Incident Isolation Time: Transitioning high-risk or abusive senders to the "Penalty Box" or circuit-breaking campaigns within minutes of a threshold breach.
Benefits
This is a highly technical systems engineering role, not a marketing or email campaign management position.
To be considered, you must have hands-on experience configuring Linux mail servers at the command-line level.
Please confirm upon applying that the compensation range of $24,000 to $36,000 USD per year aligns with your expectations.
#J-*****-Ljbffr

📌 Senior Infrastructure Engineer – Giger Team (Buenos Aires)
🏢 Deel
📍 Buenos Aires