Senior or Mid Backend Software Engineer (m/f/d)

Talanto; Poland; Hybrid; PLN 141,000 - 343,000; Full time

Benefits offered by this job

20 days PTO on B2B

Multisport card

Occasional travel to Germany

Job summary

WAWEX is looking for a Senior/Mid Backend Software Engineer to implement and scale high-throughput micro-services in Go. The role is hybrid in Warsaw with in-office days on Tuesday and Thursday and remote work otherwise.

Ideal candidates have 3+ years of backend experience, strong RESTful and event-driven design, and proficiency in SQL/NoSQL with DynamoDB and PostgreSQL. Occasional travel to Germany may be required, and 20 days PTO on B2B plus Multisport are offered.

Qualifications

• 3+ years of professional back-end experience (ideally 1 year+ in Go).
• Solid grasp of cloud-native design (RESTful APIs, event-driven patterns).
• Working SQL and NoSQL skills; know when each shines.
• Ability to work on-site in Warsaw twice a week (Tue & Thu) and remotely otherwise.

Responsibilities

• Implement new micro-services and extend existing ones in Go.
• Help groom user-story requirements and surface performance / scaling concerns early.
• Write unit, integration and API tests; review PRs.
• Tune data-models in DynamoDB & Postgres for low-latency, high-throughput workloads.
• Pair with DevOps on CI/CD and observability improvements.
• Participate in on-call rotation as we’re building high available fintech system

Skills

Go

RESTful APIs

Event-driven design

SQL

NoSQL

Cloud-native

Unit testing

Tools

DynamoDB

PostgreSQL

Job description

Senior or Mid Backend Software Engineer (m/f/d)

12,600 – 30,750 PLN

Important: if an employer asks you to log into their system via iCloud or Google, send a code, an SMS or Telegram password, run some code, or install software — refuse. These are signs of fraud.

About us

••••••••• is a leading FinTech company offering an innovative platform for securities and cryptocurrency trading, specifically tailored for institutional clients. In Germany, ••••••••• holds BaFin licenses as a securities institution, ensuring full regulatory compliance. With our cutting-edge development hub located in Warsaw, ••••••••• Technologies Warsaw, we drive the technical innovation behind our products. Additionally, through our brand WAWEX, we operate a state-of-the-art cryptocurrency exchange in Warsaw, providing a seamless and secure trading experience. Our mission is to empower institutional traders with advanced tools and technologies that redefine the trading landscape.

WAWEX is a cutting-edge fintech platform at the forefront of the digital finance revolution. Empowering financial institutions, brokers, and banks, WAWEX delivers seamless access to over 75 cryptocurrencies, combining state-of-the-art security with unparalleled market depth. Through innovative tokenization and real-time market insights, WAWEX is shaping the future of trading. With robust API integrations and 24/7 availability, this dynamic platform is designed for institutions ready to embrace the fast-paced world of digital assets and unlock limitless opportunities in global finance.

Location: Hybrid (Warsaw – in-office every Tuesday & Thursday)

Implement new micro-services and extend existing ones in Go.

Help groom user-story requirements and surface performance / scaling concerns early.

Write unit, integration and API tests; review PRs.

Tune data-models in DynamoDB & Postgres for low-latency, high-throughput workloads.

Pair with DevOps on CI/CD and observability improvements.

Participate in on-call rotation as we’re building high available fintech system

Additional tasks of the Senior

Design and drive high-scale, low-latency services (tens of thousands of orders / sec).

Lead architecture reviews, challenge assumptions and keep tech debt in check.

Partner with Product on roadmap feasibility & effort sizing.

Be a mentor to less experienced colleagues

Perfect candidate profile

3+ years of professional back-end experience (ideally 1 year+ in Go).

Solid grasp of cloud-native design (RESTful APIs, event-driven patterns).

Working SQL and NoSQL skills; know when each shines.

Ability to work on-site in Warsaw twice a week (Tue & Thu) and remotely otherwise.

Nice to have

Exposure to serverless architectures on AWS.

Knowledge of automated trading, market data, or FIX/crypto exchanges.

Familiarity with Infrastructure-as-Code (Terraform or CDK).

What we offer

An experienced, welcoming team that loves clean, well-tested code.

Real impact: the features you ship go straight into production for live traders.

• Flexible hours, modern tooling, and a fintech domain that’s never boring.
• Occasional work travel to Germany (Munich / Berlin)
• 20 days PTO on B2B
• Multisport card

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In line with the market for similar positions

Based on 40 similar vacancies

5836$ /month

5836$ /month Your offer

5311 $ 25%

7172 $ median

9471 $ 75%

The range shows the lower and upper market bands: 25% of vacancies pay below the first value, the median is the typical salary, and 75% marks the upper band.