Senior Software Engineer
About Nelo Nelo is a leading consumer fintech and e-commerce platform in Mexico, with >$500MM in annualized GMV and >$70MM in annualized revenue. Our mission is to increase the buying power of consumers in Latin America, and we are doing so by building a modern alternative to credit cards.
What this role actually needs.
About Nelo Nelo is a leading consumer fintech and e-commerce platform in Mexico, with >$500MM in annualized GMV and >$70MM in annualized revenue. Our mission is to increase the buying power of consumers in Latin America, and we are doing so by building a modern alternative to credit cards. Responsibilities: - Architect for Scale: You will design and ship backend systems that can handle our rapid growth without falling over. Larger projects and ambitious goals will help make the job more interesting. - Evolve the Tech: You’ll lead the charge in moving us from a Kotlin monolith to smarter microservices. Access to this technology streamlines work processes and allows you to stay at the forefront of your field. - Raise the Bar: You will mentor other engineers, not by lecturing them, but by coding well and reviewing hard. Helping others learn new things is often the biggest single thing candidates are interested in. - Solve Real Problems: You'll work with product and data teams to turn abstract ideas into working software. This allows you to see the direct impact of your work. Requirements: - You’ve been around the block. You have 5+ years of backend engineering experience and you’ve built (and broken) real distributed systems. - You value rigor. You are comfortable with Kotlin and Spring (or similar), and you know your way around AWS and Terraform. You understand that better resources and tools reduce frustration. - You think in systems. You don't just look at lines of code; you look at how the whole machine operates. - You have an opinion. You care about performance and data integrity, and you aren't afraid to speak up when you see a "quick fix" that will hurt us later. Company context: Nelo is a Mexico fintech company with engineering, product, and data hiring anchored in the Mexican market.
Day-to-day expectations
Nelo lists these responsibilities for the Senior Software Engineer role.
- Architect for Scale: You will design and ship backend systems that can handle our rapid growth without falling over. Larger projects and ambitious goals will help make the job more interesting.
- Evolve the Tech: You’ll lead the charge in moving us from a Kotlin monolith to smarter microservices. Access to this technology streamlines work processes and allows you to stay at the forefront of your field.
- Raise the Bar: You will mentor other engineers, not by lecturing them, but by coding well and reviewing hard. Helping others learn new things is often the biggest single thing candidates are interested in.
- Solve Real Problems: You'll work with product and data teams to turn abstract ideas into working software. This allows you to see the direct impact of your work.
What a strong candidate brings
These requirements are extracted from the source listing and normalized for UpJobz readers.
- You’ve been around the block. You have 5+ years of backend engineering experience and you’ve built (and broken) real distributed systems.
- You value rigor. You are comfortable with Kotlin and Spring (or similar), and you know your way around AWS and Terraform. You understand that better resources and tools reduce frustration.
- You think in systems. You don't just look at lines of code; you look at how the whole machine operates.
- You have an opinion. You care about performance and data integrity, and you aren't afraid to speak up when you see a "quick fix" that will hurt us later.
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Source: jobs.ashbyhq.com · Source ID: af47eb46-a637-476f-a6fb-04bc7fcb9973 · Confidence: 90/100 · Last checked: May 7, 2026
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