[![Image](https://upload.wikimedia.org/wikipedia/commons/8/82/Telegram_logo.svg) Fresh remote jobs, sorted by category — join Jobicy on Telegram  › Fresh remote jobs on Telegram  ›](https://t.me/JobicyJobs) [All remote jobs](https://jobicy.com/jobs.md)Open role[![Flex logo](https://jobicy.com/data/server-nyc0409/galaxy/mercury/2025/06/7bfdefe3-221.jpeg)](https://jobicy.com/company/flex.md)Remote opportunity at[Flex](https://jobicy.com/company/flex.md)

# Senior Software Engineer, Backend

Review the role, location requirements, compensation details, and application process before deciding whether this opportunity fits your next career move.

[Apply for this job](#job-application)[View company](https://jobicy.com/company/flex.md)Share1 Sep 2026Published29Listing views3Application actions1 Oct 2026Apply before  Opportunity details

## About this role.

AI SummaryFlex is hiring a Senior Backend Software Engineer to build and maintain financial-platform services involving card processing, issuing, and core transaction ledgering. The role emphasizes end-to-end ownership of scalable, secure, highly available backend systems, from API contracts and data models through observability and production operations. Candidates need strong Node.js and TypeScript experience, cloud familiarity, architectural judgment, and at least four years of relevant industry experience. This is an early-stage, high-accountability environment with mentoring responsibilities, on-call participation, and a strong execution-oriented culture.

## Role DNA

A quick view of the complexity, pace, ownership and collaboration implied by the job description.

### Job Complexity

5/5EasyHard

### Pace & Pressure

5/5RelaxedFast-paced

### Autonomy Level

5/5GuidedFull ownership

### Communication Load

4/5IndependentCollaborative

AI insightThis is a technically demanding fintech role because production systems directly control money movement and require high standards for correctness, scalability, security, and observability. The senior engineer is expected to own large domains, make architectural tradeoffs, mentor others, and support on-call operations in a fast-moving startup.

## Salary analysis

Estimated compensation compared with the broader US market for similar roles.

Estimated job medianBelow market$77,500US market range$130k–$190k0$209k

AI insightThe disclosed base compensation range is USD 55,000–100,000 yearly, with a midpoint of USD 77,500. For comparison, the estimated US market range for a senior backend software engineer with fintech, distributed-systems, and on-call responsibilities is approximately USD 130,000–190,000 annually; this market benchmark is an estimate and may vary substantially by location, equity, and total compensation.

## Core skills

Skills and capabilities most closely associated with this opportunity.

[Node.js](https://jobicy.com/jobs?search_keywords=Node.js.md)[TypeScript](https://jobicy.com/jobs?search_keywords=TypeScript.md)[Backend Engineering](https://jobicy.com/jobs?search_keywords=Backend%20Engineering.md)[Distributed Systems](https://jobicy.com/jobs?search_keywords=Distributed%20Systems.md)[Financial Technology](https://jobicy.com/jobs?search_keywords=Financial%20Technology.md)[API Design](https://jobicy.com/jobs?search_keywords=API%20Design.md)[Data Modeling](https://jobicy.com/jobs?search_keywords=Data%20Modeling.md)[Cloud Computing](https://jobicy.com/jobs?search_keywords=Cloud%20Computing.md)[Microservices](https://jobicy.com/jobs?search_keywords=Microservices.md)[Observability](https://jobicy.com/jobs?search_keywords=Observability.md)

Sample interview questionsHow would you design a ledger service for financial transactions that requires a complete and auditable history?I would use an immutable double-entry ledger model where each transaction creates balanced debit and credit entries. I would enforce idempotency with durable request keys, maintain clear transaction states, retain an audit trail, and use reconciliation processes to identify discrepancies with external payment systems.

How do you approach building an idempotent payment-processing API?

I require clients to provide an idempotency key, persist the key and request fingerprint before initiating side effects, and return the original result for repeated valid requests. I also define behavior for concurrent requests, expiration, partial failures, retries, and downstream provider timeouts.

Describe how you would evaluate whether to use a modular monolith or microservices for a new financial product domain.

I would begin with domain boundaries, team ownership, change frequency, reliability requirements, and operational maturity. A modular monolith is often preferable early because it reduces deployment and consistency complexity, while separate services become justified when a domain needs independent scaling, isolation, release velocity, or clearly distinct ownership.

What observability signals would you implement for a critical money-movement service?

I would implement structured logs with correlation IDs, distributed traces across internal and provider calls, and metrics for throughput, latency, error rates, retries, queue depth, failed reconciliation, and transaction-state transitions. I would pair those signals with actionable alerts, dashboards, runbooks, and business-level monitoring such as payment success and settlement completion rates.

How do you communicate a major architectural tradeoff to engineering and product stakeholders?

I present the decision in terms of the problem, viable options, assumptions, risks, cost, delivery impact, and expected customer outcomes. I make my recommendation explicit, document why alternatives were rejected, invite challenge from relevant stakeholders, and define measurable criteria for revisiting the decision after implementation.

Flex is building the AI-native private bank for business owners.

We’re re-architecting the entire financial system for entrepreneurs—from the first dollar a business earns to how that value compounds, moves, and is ultimately spent in real life. Banking, credit, payments, personal finance, and financial operations—rebuilt from the ground up as a single, intelligent system. Flex is the full financial home for ambitious owners.

Since launching publicly in September 2023, Flex has scaled from zero to nine-figure annualized revenue, with a clear path to profitability by late 2026. We move fast, ship relentlessly, and operate with extreme ownership.

Our customers are affluent business owners ($3–$200M in revenue)—the backbone of the economy and one of the most underserved segments in finance. They’re stuck with outdated banks and fragmented tools. We’re replacing all of it. The opportunity is massive: a ~$1T+ revenue market hiding in plain sight. Our ambition is to build a $100B+ company by delivering a product that is fundamentally better—not incrementally improved.

Flex has raised $100M+ in equity and $300M+ in debt.

– Mission-critical problems: We build software that directly controls how money moves at scale.

– High bar, low ego: Small teams, exceptional people, real ownership.

– Speed over comfort: We prioritize execution, quality, clarity, and results.

– Enduring impact: What we’re building will define how a generation of owners runs their businesses.

Team & Locations

We hire exceptional people who want to build hard things and see their work matter immediately. Roles are available in: San Francisco, Miami, New York, and fully remote.

Flex Fuels Ambition.

The Role

We are looking for engineers who are excited to be part of our early story and help us build a diverse and vibrant company. As a senior software engineer you will have the opportunity to work across the entire stack with a focus on the back-end. You will have the opportunity to learn and drive the creation of financial products and experiences to help our customers reach their full potential. You should have a strong sense of ownership and enjoy taking projects from inception to release. As an early employee, you’ll be working with a nimble team of committed and talented engineers and having a large, long-term impact on technical design and engineering culture.

We are open to candidates from Canada, the United States, and Colombia.

### What You’ll Do

* Ownership over large domains and features related to card processing/issuing, and core ledgering of financial transactions
* Play a critical role in the development, design, and maintenance of Flex’s platform and services.
* Architect well thought-out services and data models that ensure Flex’s continued growth
* Own problems end-to-end, thinking through everything from api contracts, data, scalability, security, observability, and metrics.
* Lead by example and mentor engineers in all aspects of planning, development and testing.
* Be a catalyst for driving best-in-class technology frameworks and tooling while staying engaged with the latest technology trends.
* Be on call, with the expectation to ability to solve problems and find solutions for the servicing team

### What You Need

* Proficiency in NodeJS+Typescript and server design principles.
* An understanding and interest in architectural patterns for highly available, scalable, low-latency, asynchronous systems
* Ability to hold yourself and the team to high standards.
* Strong communication (written and verbal) and interpersonal skills.
* Ability to provide in-depth evaluation of multiple technical directions and determine tradeoffs of each.
* Strong propensity to make data-driven decisions on technical architecture and project prioritization.
* Exposure to modular monoliths and micro-services along with the benefits and challenges they bring.
* Experience with any cloud based provider like Google Cloud, AWS, or Azure.
* Four or more years of relevant industry experience with a track record of shipping high-quality products and features at scale.
* A strong work ethic and are ready to grind
* Have built and shipped a working project or product, ideally something complex

### Compensation

### Additional Information

Interested? We’d love to hear from you

At Flex, we value passion, determination, and honesty. Even if you don’t fully match the job specifics, we encourage you to apply. Unusual career paths and unique skills can help you stand out. We believe diversity drives our success. Join us at jobs@flex.one

Why Join Us

Build something generational — Capture the full lifecycle of money for ambitious business owners.

Work on real money, real risk — Payments, credit, and banking at serious scale.

Solve hard problems — AI, underwriting, compliance, and global finance from first principles.

True ownership — Small teams, high trust, real accountability.

Founder-level exposure — Direct access to leadership, customers, and investors.

High bar, high taste — Move fast without cutting corners.

Elite peers — People here are builders, not tourists.

Real upside — Meaningful equity if you help build something big.

Show more

[Apply now >](https://jobicy.com/jobs/152343-senior-software-engineer-backend-3.md)

*

![Upload CV](data:image/svg+xml;base64,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)

### Upload your resume now

To unlock remote work opportunities and be discovered by global employers.

This job listing has been manually reviewed by the Jobicy Trust & Safety Team for compliance with our posting guidelines, including verification of the company's legitimacy, accuracy of job details, clarity of remote work policy, and absence of misleading or fraudulent content.

Next step

## Apply now.

Follow the employer’s application method and review Jobicy’s safety guidance before sharing personal information.

Keep exploring

## Related remote jobs.

Matched by job category10 related opportunities[Software Engineering](https://jobicy.com/categories/engineering.md) [Browse all jobs](https://jobicy.com/jobs.md)
*
![Serve Robotics logo](https://jobicy.com/data/server-nyc0409/galaxy/mercury/2025/08/8ad805d9-221.png)
Serve Robotics  Sep 1

### [Full-Stack Software Engineer, Internal Services](https://jobicy.com/jobs/152352-full-stack-software-engineer-internal-services.md)

At Serve Robotics, we’re reimagining how things move in cities. Our personable sidewalk robot is our vision for the future. It’s designed to take deliveries away from congested streets, make…

*
![AlertMedia logo](https://jobicy.com/data/server-nyc0409/galaxy/mercury/2022/03/38d8b6a506d39ead683086c25f6ac132.jpeg)
AlertMedia  Sep 1

### [Sr. Software Engineer](https://jobicy.com/jobs/152344-sr-software-engineer-3.md)

Do work that matters. At AlertMedia, we help organizations protect their people, operations, and brand. Our modern Risk Intelligence and Response platform empowers teams to detect emerging threats, assess impact,…

*
![Testlio logo](https://jobicy.com/data/server-nyc0409/galaxy/mercury/2025/06/11024036-221.png)
Testlio  Sep 1

### [QA Analyst (Future Roles)](https://jobicy.com/jobs/152333-qa-analyst-future-roles.md)

About Testlio Testlio’s fully managed crowdsourced testing platform, powered by our proprietary intelligence technology – LeoAI EngineTM, integrates expert, on-demand testers directly into your release process. Ship faster and more…

*
![Upgrade logo](https://jobicy.com/data/server-nyc0409/galaxy/mercury/2025/06/e0cafe30-221.jpeg)
Upgrade  Sep 1

### [Senior QA Automation Developer (Platform)](https://jobicy.com/jobs/152334-senior-qa-automation-developer-platform.md)

Upgrade helps customers move in the right direction with affordable and responsible financial products. Since 2017, we’ve helped over 7.5 million customers access over $42 billion in consumer credit. With…

*
![Imprint logo](https://jobicy.com/data/server-nyc0409/galaxy/mercury/2024/02/a28c5741-221.jpeg)
Imprint  Sep 1

### [Email Automation & QA Specialist](https://jobicy.com/jobs/152332-email-automation-qa-specialist.md)

Who We Are Imprint helps the world’s best brands grow the lifetime value of their customers. We started with co-branded credit cards and rebuilt them to be smarter, more rewarding,…

*
![Axon logo](https://jobicy.com/data/server-nyc0409/galaxy/mercury/2024/12/d134bd27-221.jpeg)
Axon  Sep 1

### [Sr Supplier Quality Engineer I](https://jobicy.com/jobs/152331-sr-supplier-quality-engineer-i.md)

Join Axon and be a Force for Good. At Axon, we’re on a mission to Protect Life. We’re explorers, pursuing society’s most critical safety and justice issues with our ecosystem…

*
![StackAdapt logo](https://jobicy.com/data/server-nyc0409/galaxy/mercury/2022/01/bf5f2bb689c6f35f6cab5459f3eff869.jpg)
StackAdapt  Sep 1

### [Quality Engineer](https://jobicy.com/jobs/152330-quality-engineer-2.md)

StackAdapt is the leading technology company that empowers marketers to reach, engage, and convert audiences with precision. With 465 billion automated optimizations per second, the AI-powered StackAdapt Marketing Platform seamlessly…

*
![AssetWatch logo](https://jobicy.com/data/server-nyc0409/galaxy/mercury/2025/06/118c6be8-221.png)
AssetWatch  Sep 1

### [Quality Assurance Engineer](https://jobicy.com/jobs/152329-quality-assurance-engineer-2.md)

AssetWatch serves global manufacturers by powering manufacturing uptime through the delivery of an unparalleled condition monitoring experience, with a passion to care about the assets our customers care for every…

*
![Tala logo](https://jobicy.com/data/server-nyc0409/galaxy/mercury/2022/02/a788b3a65c0fc717303f0b5b049cc7e6.jpeg)
Tala  Sep 1

### [SDET II](https://jobicy.com/jobs/152328-sdet-ii.md)

About Tala Tala is AI-native credit infrastructure for the global majority, combining proprietary risk intelligence with an expanding network of capital and distribution partners to power credit access at scale….

*
![Welo Global logo](https://jobicy.com/data/server-nyc0409/galaxy/mercury/2026/06/83c40f94-221.webp)
Welo Global  Sep 1

### [Bulgarian Localization QA Tester / Proofreader (Part -time)](https://jobicy.com/jobs/152327-bulgarian-localization-qa-tester-proofreader-part-time.md)

About Welocalize Welocalize, a Welo Global brand, serves localization teams through AI-enabled multilingual content solutions that enable enterprises to operate and scale globally. Welocalize combines AI, automation, and human expertise…